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117 results about "Diaminotoluene" patented technology
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Diaminotoluene may refer to: 2,4-Diaminotoluene 2,5-Diaminotoluene
Preparing methods of carbon quantum dots and phosphorescence composite material of carbon quantum dots
ActiveCN109652058AHigh fluorescence quantum efficiencyImprove solubilityLuminescent compositionsSolubilityAniline
The invention discloses preparing methods of carbon quantum dots and a phosphorescence composite material of the carbon quantum dots. The carbon quantum dots are synthesized through aniline monomers such as 3,5-diaminobenzoic acid, 2,4-diaminobenzenesulfonic acid and 2,6-diaminotoluene under the room-temperature condition. The composite material is compounded by the water-soluble carbon quantum dots and a hydrophilic poymer such as polyacrylic acid, sodium polyacrylate, polyacrylamide, polymaleic anhydride, polymaleic acid and sodium polystyrenesulfonate. The preparing technology is simple, the raw materials are easy to obtain, the cost is low, and the preparing method is poisonless and environmentally friendly. The carbon quantum dots are diversified, and have the advantages of being highin fluorescence quantum efficiency, good in water solubility and the like; the phosphorescence composite material is diversified, long in phosphorescence service life at the room temperature, and excellent in phosphorescence performance and has a huge application prospect in the fields of counterfeiting prevention, display, biological and chemical detection and the like.
Owner:NANJING UNIV
Method for preparing 2,4-toluene diamino menthyl formate
InactiveCN1488623AEasy to operateLow costCarbamic acid derivatives preparationOrganic compound preparationAcetic acidDistillation
The invention discloses a producing method of 2, 4-toluene diamino methyl ester formate. It uses zinc acetate as catalyst, it is produced by reacting 2, 4- diamino toluene and dimethyl ester carbonate. The process adopts non-isothermal operation, the reaction is carried on in high pressure kettle uncontinuously. In reaction period, no materials is added in or pulled out, only need to control the temperature, the pressure is correspondent to the temperature. Separates the filtered material, the filtering temperature is control within 60í½90íµ, carries on decompression distillation to the liquid, the vacuum rate is 7í½12mmHg, the temperature is 35í½80íµ, gets the product TDC after instilling out the DMC and carbinol.
Owner:HEBEI UNIV OF TECH
Synthesis method of diethyl toluene diamine
InactiveCN101417953AGood dispersionEasy to separateAmino preparation from aminesChemical recyclingSynthesis methodsFiltration
The invention discloses a method for preparing diethyltoluenediamine, which comprises the following steps: diaminotoluene and catalyst are added to a reactor; an 'aromatic amine-aluminum' catalyst system is formed after temperature rising and stirring, and ethylene is pumped into the reactor to purge the hydrogen produced by the reaction; high pressure ethylene gas is pumped in, and after complete alkylation, diphenyl ether or phenoxy biphenyl are added to dilute the reactants; the mixture is filtered, the materials at the bottom of the reactor are recycled, the filtrate is distilled, and diethyltoluenediamine is obtained. The method has the advantages that, aluminum, zinc, aluminum chloride and organic aluminum are used as the catalyst, so activity is increased, reaction pressure is lowered and reaction time is reduced; diphenyl ether or phenoxy biphenyl is added before filtration, so material viscosity can be lowered to facilitate filtration and separation, simultaneously, the 'aromatic amine-aluminum' catalyst system is not damaged; the catalyst can be recycled, so operation steps are reduced, catalyst cost is greatly lowered and environment protection is benefited.
Owner:杭州崇舜化学有限公司
Synthetic method of 2,5-diaminotoluene and sulphate thereof
ActiveCN101450904AThe pre-processing process is simpleReduce unit consumptionPreparation by N-O/N-N bondsWater dischargeToluidine
Owner:宁夏瑞鼎科技有限公司
Method for synthesizing 2, 6-diaminotoluene
ActiveCN104725242ASolve the long preparation routeSolution conditionsOrganic compound preparationAmino compound preparationDiaminotolueneChemistry
The invention relates to a method for synthesizing 2, 6-diaminotoluene. The method comprises the following step: by using 2-chlorine-6-nitrotoluene as a raw material, carrying out reduction reaction and ammonolysis reaction to obtain 2, 6-diaminotoluene. The process is simple in synthesis route, easy to control the reaction and few in three wastes generated at the working segments, thereby meeting the green and environmental friendly requirements; and moreover, produced 2, 6-diaminotoluene is high in purity and excellent in quality, so that the method is an excellent industrial route.
Owner:ZHEJIANG DINGLONG TECH
Method for preparing diethyl diaminotoluene
ActiveCN102603540AEasy to separateEasy to controlAmino preparation from aminesFixed bedDiaminotoluene
The invention relates to a method for preparing diethyl diaminotoluene. 2, 4- diaminotoluene is in ethylization reaction with ethylizing agent under catalysis of an acidic zeolite molecular sieve to prepare the diethyl diaminotoluene, wherein the ethylizing agent is selected from ethylene and ethanol. The preparation method is completed by one step, simple in process procedure and convenient in operation. The solid acidic catalyst is incorrosive to equipment and easy to be separated from reaction product after reaction is completed, and the method is applicable to continuously operated reactors such as fixed beds and the like and has industrial application prospect. Controlling anhydrous conditions during reaction is not needed, so that reaction conditions are convenient to control and cost of reaction equipment is reduced. By-products such as ethyl products, TDA (tolylenediamine), ethylene or ethanol can be recycled, and accordingly raw materials are effectively saved. Moreover, the method is environment-friendly, high in atom utilization rate, barely free of discharge of waste liquid and waste residue and free of coupled products, thereby being the development orientation of future industrial production.
Owner:DALIAN UNIV OF TECH
Preparation method of 2,6-dihydroxytoluene
ActiveCN103304381AHigh purityHigh yieldOrganic chemistryMolecular sieve catalystsWater vaporFixed bed
The invention discloses a preparation method of 2,6-dihydroxytoluene. The preparation method comprises the following steps of: by taking the 2,6-dihydroxytoluene as an initial raw material; and under the effects of a composite tube solid acid catalyst, preparing the 2,6-dihydroxytoluene through high-temperature steam hydrolysis, wherein the liquefied 2,6-dihydroxytoluene and deionized water are fed into a fixed bed reactor according to a flow ratio of (1:1.5)-(1:10), and the mixed materials are subjected to a hydrolysis reaction through the effect of the solid acid catalyst filled in the fixed bed reactor at high temperature. By utilizing the preparation method, liquid acid with large environment pollution is avoided, at the same time, high-temperature equipment and acid corrosion resisting materials are not used, so that the acid corrosion problem of the equipment in the conventional method is overcome, the environment pollution is reduced, and the economic cost is lowered; moreover the process is simple, the product purity and the yield achieve a good level, the purity of the prepared 2,6-dihydroxytoluene is more than 99% under the optimal condition, and the yield can be 95%.
Owner:常熟市联创化学有限公司
Method for producing 5-methyl benzotriazole
InactiveCN1978435ASimple processThe preparation process is simple and controllableOrganic chemistryBenzotriazoleToluene
This invention relates to a production method of 5-methyl benzotriazole. Its characteristic is that it includes following steps: (1)in reaction kettle, put 3,4 diaminotoluene in purified water, heat to dissolve; (2)add sodium nitrite of 3,4 diaminotoluene in the solution that is produced by step (1), progress reaction; (3)cool the solution produced by step (2); (4)drop sulphuric acid in the solution produced by step (3), appear a great quantity of crystal; (5)progress manipulation that takes off the liquid for mixture produced by step (4); (6) heat the crystal produced by step (5), dewater; (7)distill the crystal produced by step (6), produce the stated 5-methyl benzotriazole. The production method of this invention uses 3,4 diaminotoluene as raw material, through medium voltage synthesis, acidification, dehydration, distilling manipulation, to prepare 5-methyl benzotriazole. Technology is simple, preparation process is easy to control, yield is high, purity is high, production cost is low, and it is easy to organize industrialized production.
Owner:黄奎生
Method for recovering m-diaminotoluene from dinitrotoluene hydrogenated tar
InactiveCN101875614AHigh adsorption yieldSimple processAmino compound purification/separationMolecular sieveOrganic solvent
The invention discloses a method for recovering m-diaminotoluene from dinitrotoluene hydrogenated tar. The method adopts the dinitrotoluene hydrogenated tar as the raw material, uses molecular sieves as adsorbent and enables the dinitrotoluene hydrogenated tar and the adsorbent to contact in an adsorption condition, the adsorption temperature is 30-80 DEG C, the desorption temperature is 40-100 DEG C, the residence time is 0.5-8h, and solvent and desorption agent are organic solvent, then residual components in raw material mixture are removed, and the adsorbed m-diaminotoluene is desorbed and recovered by the desorption agent which contains low alcohol in a desorption condition.
Owner:GANSU YINDA CHEM +1
Method for synthesizing phenazine-1-carboxylic acid
The invention provides a method for synthesizing phenazine-1-carboxylic acid. The method comprises the following steps: dehydrating initial raw materials comprising catechol and 2,3-diaminotoluene in the nitrogen atmosphere, carrying out a cyclization reaction to generate 1-methy-5,10-dihydrophenazine, reacting with air for an oxidation reaction to obtain 1-methylphenazine, chlorinating 1-methylphenazine by chlorine under the catalysis of azodiisobutyronitrile, and hydrolyzing to obtain phenazine-1-carboxylic acid. The method solves the disadvantages of low efficiency, high cost, large wastewater amount and the like of previous production methods through biological fermentation, and is a new phenazine-1-carboxylic acid production technology having the advantages of high efficiency, low cost and environmental protection.
Owner:NANJING UNIV OF TECH
Method for treating TDA wastewater through complexing extraction
ActiveCN103922507AReduce concentrationThe process is simple and reasonableMultistage water/sewage treatmentNature of treatment waterKeroseneWastewater
The invention discloses a method for treating 2,4-diaminotoluene (TDA) wastewater through complexing extraction. The method is characterized by mainly comprising the steps of pH value adjustment, extraction and an extraction agent recycling treatment process. The method adopts one or two of 2-ethylhexyl 2-ethylhexyl phosphonate, di(2,4,4-trimethyl amyl) phosphonic acid as a complexing agent, one or more of n-octyl alcohol, isooctanol and sec-octyl alcohol as a cosolvent, and kerosene or cyclohexane as a diluent for preparing a complexing exaction agent for separating TDA compounds which are hard to be biochemically treated in the wastewater, and the extraction agent is regenerated by using inorganic acid and is subsequently repeatedly used. The method is simple and reasonable in process, high in operability, convenient to operate and low in treatment cost. The TDA concentration of the wastewater treated by using the process is greatly reduced, the primary extraction removal rate of TDA is 95-99%, and a wide application prospect is achieved.
Owner:BLUESTAR LEHIGH ENG INST CO LTD
Double effect process rectification diaminotoluene separation method
InactiveCN101348440AReduce the temperatureReduce loadAmino compound purification/separationProcess optimizationOrtho position
A method for separating diaminotoluene through double-effect flow rectification belongs to the rectification process optimization field with better energy conservation and consumption reduction effect. The method comprises the following steps that a coarse TDA material containing water, solvent and tar is dewatered at first; then, the solvent is removed and then the TDA containing tar undergoes isomer separation so as to remove ortho position TDA and meta position TDA; and finally, pure TDA is obtained.
Owner:GANSU YINGUANG CHEM IND GRP CO LTD
Matte polyimide black film with low heat shrinkage rate, and preparation method thereof
The invention discloses a preparation method of a matte polyimide black film with a low heat shrinkage rate. The method comprises the following steps: S1, preparing a polyamide acid resin solution: adding a matting agent into an aromatic diamine solution in an inert gas atmosphere, mixing until uniformity, adding aromatic dianhydride, and carrying out a stirring reaction to obtain the polyamide acid resin solution, wherein the aromatic diamine contains rigid aromatic diamine, and the rigid aromatic diamine is at least one of p-phenylenediamine, 2,5-diaminotoluene, 1,5-naphthalenediamine, 2,5-naphthalenediamine and 2,6-naphthalenediamine; S2, preparing a black slurry; and S3, preparing the matte polyimide black film with the low heat shrinkage rate. The invention further discloses the mattepolyimide black film with the low heat shrinkage rate. The matte polyimide black film with the low heat shrinkage rate is prepared through the preparation method of the matte polyimide black film with the low heat shrinkage rate. The matte polyimide black film with the low heat shrinkage rate has the advantages of low shrinkage rate, matt effect, maintenance of mechanical properties and electrical properties, good dimensional stability, low visible light transmittance and low surface gloss.
Owner:ANHUI GUOFENG PLASTIC
Method for preparing red and green light double-emission carbon dots and application
ActiveCN108069413AStrong resistance to photobleachingGood biocompatibilityNano-carbonFluorescence/phosphorescenceCytotoxicityBiocompatibility Testing
The invention provides water-soluble red / green light double-emission carbon dots (RGDE CDs) which are prepared by taking 2,5-diaminotoluene sulfate as a carbon source through a one-step method. Compared with an existing method, a multi-step material preparation process is avoided. The RGDE CDs prepared by the method have excellent anti-photo-bleaching capability, good biocompatibility and low cytotoxicity. Under the single excitation wavelength, the strength of green fluorescence (with the wavelength of 525nm) of the RGDE CDs is quenched after OONO- is added, and the strength of red fluorescence (with the wavelength of 603nm) is basically not changed. On the basis, the invention establishes a novel method for determining fluorescence of the OONO- through a ratio method.
Owner:LANZHOU UNIVERSITY
Preparation method of high-quantum-yield dual-emitting fluorescent carbon dots and application thereof in detection of PFOS (perfluorooctane sulfonates)
ActiveCN108529592AEasy to prepareEasy to operateNano-carbonFluorescence/phosphorescenceQuantum yieldPhosphoric acid
The invention relates to the field of nano materials, in particular to a preparation method of high-quantum-yield dual-emitting fluorescent carbon dots and application thereof in the detection of PFOS(perfluorooctane sulfonates). The high-quantum-yield dual-emitting fluorescent carbon dots are synthesized from 2,4-diaminotoluene and phosphoric acid by means hydrothermal process. The carbon dots prepared via the preparation method can emit fluorescence of two wavelengths under the excitation of light having wavelengths of 280 nm and 340 nm, emit fluorescence of the wavelengths of 350 nm and 515 nm under the excitation of 280 nm light, and emit fluorescence of the wavelengths of 434 nm and 502 nm under the excitation of 340 nm light; both two emitting centers can reach 44% and above in fluorescent quantum yield. When the carbon dots are used in measuring PFOS, the fluorescent strength ratio of the two emitting wavelengths of the carbon dots under the two exciting wavelengths is linearlyrelated to PFOS concentration; two results can be made and can verify each other, and measuring results are more accurate.
Owner:SOUTHWEST UNIV
Method for preparing aminotoluene by catalytic hydrogenation of 2,4-dinitrotoluene or/and 2,6-dinitrotoluene
InactiveCN101475488AReduce consumptionAvoid generatingOrganic compound preparationAmino compound preparationContinuous useHydrogenation reaction
The invention discloses a method for preparing corresponding diaminotoluene through catalytic hydrogenation of 2,4-dinitrotoluene or 2,6-dinitrotoluene or a mixture of the 2,4-dinitrotoluene and the 2,6-dinitrotoluene. The method for preparing the diaminotoluene through catalytic hydrogenation of the 2,4-dinitrotoluene comprises: respectively adding the 2,4-dinitrotoluene or the 2,6-dinitrotoluene or the mixture of the 2,4-dinitrotoluene and the 2,6-dinitrotoluene, and ethanol and a supported catalyst into a reaction kettle first; performing hydrogenation reaction for 3 to 8 hours at a temperature of between 60 and 90 DEG C, wherein the pressure of the hydrogenation reaction is between 1.5 and 3.0 MPa; and performing solid-liquid separation after the reaction is over, using separated supernatant for product separation, and conveying a separated solid catalyst back to a reaction system for continuous use.
Owner:甘肃中科药源生物工程股份有限公司
Synthetic method for precursor of anthraquinone reactive disperse dye used in supercritical CO2
The invention specifically relates to a synthetic method for a precursor of an anthraquinone reactive disperse dye used in supercritical CO2, which belongs to the technical field of dyes. According to the method, 1-chloroanthraquinone and 2,5-diaminotoluene sulfate are used as raw materials, K2CO3 is used as an acid-binding agent, and CuI is used as a reaction catalyst, a heating reflux reaction is carried out at 80 to 140 DEG C for 6 to 14 h under the protection of nitrogen; and after completion of the reaction, post-treatment is carried out so as to obtain solid powder of the dye precursor. The method has the advantages of a low usage amount of the catalyst, mild reaction conditions, high yield and low cost, and the obtained precursor has good applicability; and the method is applicable to synthesis of the anthraquinone reactive disperse dye used in supercritical CO2 and to synthesis of reactive disperse dyes used in conventional water-bath dyeing.
Owner:SUZHOU UNIV
Method for preparing AS-605240 and application thereof on preparing medicines for treating inflammatory diseases
InactiveCN101550135AGood curative effectMild reaction conditionsOrganic active ingredientsOrganic chemistryQuinoxalineSodium bicarbonate
The invention relates to a method for preparing AS-605240 and an application thereof on medicines for treating inflammatory diseases. An improvement of the preparation method disclosed to the international patent is supplied to 5-quinoxaline methylene-2, 4-thiazolidinedione (AS-605240 with a structural formula I). 3, 4-diaminotoluene and glyoxal water solution as raw materials are relatively easy to obtain, reactive reagent, such as sodium bicarbonate, N-bromosuccinimide, carbon tetrachloride, and the like in each step is cheap and easy, and the reaction condition is mild. A great deal of mouse experimental curative effect observation of myocarditis, acute and chronic hepatitis, acute colitis and pancreatitis, which is induced by concanavalin A, is performed by the AS-605240, and the favorable curative effects of the AS-605240 are all confirmed. The prior TZDs, such as troglitazone, and the like are mainly used for aspects on treating diabetes mellitus, angiocardiopathy, and the like. In recent years, a study confirms that the AS-605240 protects the mouse joint and treats rheumatoid arthritis through restraining an osphatidylinositol 3 (PI3K) kinase gamma subtype signal way, therefore, the AS-605240 application on medicines for treating the inflammatory diseases opens up a new medical treatment field on the discovery of thiazolidinedione compound.
Owner:SICHUAN UNIV
Preparation method of 5-amino-6-methyl benzimidazolone
The invention relates to a preparation method of 5-amino-6-methyl benzimidazolone, belonging to the technical field of a compound preparation method, in particular to a preparation method of fine chemical intermediate. The preparation method is characterized by sequentially comprising the following steps of: carrying out condensation on 3, 4-diaminotoluene and urea, and preparing 5-methyl benzimidazolone; carrying out nitration reaction on the 5-methyl benzimidazolone under the condition of dilute nitric acid, and preparing 5-nitro-6-methyl benzimidazolone; and finally, carrying out reduction reaction on the 5-nitro-6-methyl benzimidazolone, and preparing the target compound of 5-amino-6-methyl benzimidazolone. In the reduction process of ferrous powder of the reduction reaction of the preparation method, alcohol-water system is taken as a solvent, and the system has low toxicity. In the process of hydrogenation reduction process, DMF-water system is taken as a solvent, and the solvent can be easily recovered, so that the cost is saved. In the process of hydrogenation reduction process, Nguyen Ni or Pd carbon is taken as a catalyst, so that the catalysis effect is good, the cost is low, and the synthetic route has simple technique.
Owner:淄博圣马化工有限公司
A kind of oxidative dyeing composition
ActiveCN105596228BSmall color differenceSatisfy dyeing needsCosmetic preparationsHair cosmeticsMethylenedioxyPhenol
The invention relates to an oxidized type dyeing composition. The oxidized type dyeing composition comprises a first agent and a second agent, wherein the first agent contains an oxidation coloring base, a coupling agent and an oxidation retarder; the second agent contains an oxidant; the oxidation coloring base comprises 2,5-diaminotoluene or an addition salt thereof, the coupling agent comprises hydroxyethyl-3,4-methylene dioxyaniline or an addition salt thereof, and the oxidation retarder is a polyhydroxyl phenol oxidation retarder. The oxidized type dyeing composition provided by the invention is applied to hair, of which the ratio of white hair does not exceed 50%, and the color difference between the white hair and black hair after hair dyeing can be reduced while the white hair is excellently covered, so that the dyeing requirement that the hair is uniformly dyed to brown can be met.
Owner:肇庆迪彩日化科技有限公司
Technology for separating and purifying 2,4-diaminotoluene and 2,6-diaminotoluene by derivatization crystallization process
InactiveCN103319352AHigh puritySimple processAmino compound purification/separationDistilled waterToluene
The invention provides a technology for separating and purifying 2,4-diaminotoluene and 2,6-diaminotoluene by a derivatization crystallization process. The technology adopts TDA as a raw material and comprises the following steps of: performing rectification degumming treatment and dissolving in distilled water; adjusting the pH to 6-6.5, adding sodium chloride and performing a catalysis reaction; crystallizing and separating to obtain a crude product of 2,6-diaminotoluene; performing sectional rectification to obtain a pure product of 2,6-diaminotoluene; adjusting the pH of the mother liquid obtained after separating the 2,6-diaminotoluene to 10-12; adding sodium hydrosulfite and performing a catalysis reaction; crystallizing and separating to obtain a crude product of 2,4-diaminotoluene; performing sectional rectification to obtain a pure product of 2,4-diaminotoluene. According to the technology provided by the invention, a derivatization crystallization process is adopted for separation and purification so that the 2,4-diaminotoluene and 2,6-diaminotoluene in TDA (Toluene Diammonium) are completely separated, the utilization rate of the raw materials is over 99%, and the main content of the product is over 99%.
Owner:GANSU SHANDAN HONGDINGYUAN CHEM
Combinational preparation method of nano zinc oxide and toluene dicarbamate
ActiveCN101012177AImprove economyReduce adverse effectsOrganic compound preparationZinc oxides/hydroxidesMethyl carbonateToluenediamine
The invention discloses a making method of toluenediamine methyl formate of nanometer zinc oxide, which comprises the following steps: adding diaminotoluene, zinc acetate and dimethyl ester carbonate in the autoclave with molar rate at 1:0.01-0.7:15-30; sealing the autoclave; stirring; reacting under 100-200 deg.c for 1-10h; filtering; decompressing to rectify under 30-70 deg.c at 5-30Kpa; obtaining the solid product (toluenediamine methyl formate); washing filter pie; drying in the vacuum; obtaining the nanometer zinc oxide.
Owner:HEBEI UNIV OF TECH
Solvent-Soluble 6,6-Polyimide Copolymers and Processes for Preparing Them
ActiveUS20130018167A1Good storage stabilityEasy to useFilm/foil adhesivesDiaminodiphenyl etherFour component
Heat-resistant polyimide copolymers having the following four components: pyromellitic dianhydride (PMDA), 1,4-diaminodiphenyl ether (DADE), biphenyltetracarboxylic dianhydride (BPDA), and 2,4-diaminotoluene (DAT) are provided. In an embodiment the molar ratio of (BPDA):(DADE):(PMDA):(DAT) is 2:2:m:m, in which m is an integer of 3, 4 or 5.
Owner:SOLPIT IND
Green synthetic method of 2,5-diaminotoluene
ActiveCN101659620AReduce pollutionEasy to operatePhysical/chemical process catalystsOrganic compound preparationHydrazine compoundHydrotalcite
The invention provides a green synthetic method of 2,5-diaminotoluene shown as the formula (II). The method comprises the following steps: taking 2-methyl-4-nitroaniline as raw material, magnetic Mg / Al-hydrotalcite solid alkali as catalyst and hydrazine hydrate as reducing agent, reacting at the temperature of 0-100 DEG C for 1-20 hours, and separating and purifying the reaction solution to prepare the 2,5-diaminotoluene. Compared with the prior art, the green synthetic method has the beneficial effects that: the magnetic Mg / Al-hydrotalcite solid alkali taken as catalyst and the hydrazine hydrate taken as reducing agent are applied in the synthesis of the 2,5-diaminotoluene, so that compared with the prior art, the preparation of the 2,5-diaminotoluene is simpler in processing, easy in operation, high in reaction yield, and good in product purity, has no pollution to environment, is suitable for industrialized production with a certain scale, is a green and clean synthetic line, and has no application report of industrialized production at present.
Owner:山东兴安智慧科技有限公司
Technology for purifying 2, 4-diaminotoluene by recrystallization method
ActiveCN104402732AReduce manufacturing costMeet the requirements of energy saving and emission reductionAmino compound purification/separationAlcoholKetone solvents
The invention discloses a technology for purifying 2, 4-diaminotoluene by a recrystallization method. The technology comprises the following steps: a) mixing the mixture of 2,4-diaminotoluene and 2,6-diaminotoluene, distilled water and an organic alcohol solvent or a ketone solvent at the mass ratio of 1:(0.5-1.5):(0.5-1.5) in a reactor, stirring the materials under a regurgitation state at the temperature of 50-90 DEG C to enable the materials to be uniformly mixed; b) stopping heating, cooling the mixed materials to the temperature of 5-25 DEG C in a crystallizer, and separating out crystals; c) performing centrifugation and washing; d) drying the washed crystals so as to obtain the pure product 2,4-diaminotoluene. Through the adoption of the technology disclosed by the invention, the content of the 2,4-diaminotoluene in products exceeds more than 99.5%, the product quality is improved, and the additional value is increased; besides, washed raffinate can be circularly utilized and can be used for replacing about 60% of raw material water and a solvent, so that the production cost is reduced, requirements of energy conservation and emission reduction are met, and secondary pollution is avoided.
Owner:CANGZHOU FENGYUAN ENVIRONMENTAL PROTECTION SCI & TECH
2, 4-diaminotoluene purification method
ActiveCN105061215AAvoid stagnationAmino compound purification/separationPurification methodsEngineering
The invention provides a 2, 4-diaminotoluene purification method. The method comprises the steps that an initial raw material composed of 2, 4-diaminotoluene and 2, 6-diaminotoluene is fed into a preheated crystallizer after being dissolved; the crystallizer is cooled at a preset cooling speed until crystals are dissolved out; heat is preserved until crystallizing layers grow up completely; residual liquor in the crystallizer is discharged, and temperature of the crystallizer is raised at a preset temperature raising speed for carrying out sweating processing on the crystallizing layers; sweat liquid is discharged from the crystallizer; the temperature of the crystallizer is raised so as to dissolve the crystallizing layers in the crystallizer completely, so that liquid 2, 4-diaminotoluene product is obtained. By meticulously designing all the technological steps, purification of 2, 4-diaminotoluene is practical for industrialization.
Owner:CANGZHOU FENGYUAN ENVIRONMENTAL PROTECTION SCI & TECH
2, 4-diaminotoluene purification system
ActiveCN105061222AEasy to purifyCompact structureAmino compound purification/separationDiaminotolueneWaste management
The invention provides a 2, 4-diaminotoluene purification system which comprises a crystallizer, a heat exchanger, a raw material tank, a product receiving tank, a sweat liquid receiving tank and a residual liquid receiving tank. The crystallizer is provided with a feed port and a discharge port. The crystallizer further comprises a temperature adjusting sleeve which is arranged around the crystallizer and used for changing temperature of the crystallizer. The temperature adjusting sleeve is provided with a circulating water inlet and a circulating water outlet. The heat exchanger is used for heating or cooling circulating water in the temperature adjusting sleeve. The raw material tank is communicated with the feed port of the crystallizer. The product receiving tank, the sweat liquid receiving tank and the residual liquid receiving tank are communicated with the discharge port of the crystallizer. The purification system can carry out TDA purification conveniently, the structure is compact, and therefore the overall occupied area is small.
Owner:CANGZHOU FENGYUAN ENVIRONMENTAL PROTECTION SCI & TECH
Method for producing tolylene diisocyanate
ActiveUS20140073811A1Carbamic acid derivatives preparationOrganic compound preparationAlcoholToluene
A method for producing tolylene diisocyanate includes: mixing a first diaminotoluene containing 2,4-diaminotoluene and 2,6-diaminotoluene at a first isomer ratio and a second diaminotoluene containing 2,4-diaminotoluene and / or 2,6-diaminotoluene at a second isomer ratio that is different from the first isomer ratio so as to prepare mixed diaminotoluene; producing tolylene dicarbamate by reaction of the mixed diaminotoluene, urea and / or N-unsubstituted carbamic acid ester and alcohol; and thermally decomposing the tolylene dicarbamate.
Owner:MITSUI CHEM INC
Oxidized type dyeing composition
ActiveCN105596228ASmall color differenceSatisfy dyeing needsCosmetic preparationsHair cosmeticsMethylenedioxyPhenol
The invention relates to an oxidized type dyeing composition. The oxidized type dyeing composition comprises a first agent and a second agent, wherein the first agent contains an oxidation coloring base, a coupling agent and an oxidation retarder; the second agent contains an oxidant; the oxidation coloring base comprises 2,5-diaminotoluene or an addition salt thereof, the coupling agent comprises hydroxyethyl-3,4-methylene dioxyaniline or an addition salt thereof, and the oxidation retarder is a polyhydroxyl phenol oxidation retarder. The oxidized type dyeing composition provided by the invention is applied to hair, of which the ratio of white hair does not exceed 50%, and the color difference between the white hair and black hair after hair dyeing can be reduced while the white hair is excellently covered, so that the dyeing requirement that the hair is uniformly dyed to brown can be met.
Owner:肇庆迪彩日化科技有限公司
2,4-diaminotoluene molecularly imprinted polymer, preparation method and application thereof
ActiveCN104672370AStrong specificityImprove separation efficiencyComponent separationPolymer scienceFunctional monomer
The invention discloses a 2,4-diaminotoluene molecularly imprinted polymer, a preparation method and application thereof, and particularly provides the 2,4-diaminotoluene molecularly imprinted polymer prepared from a functional monomer of methyl acrylic acid, a template molecule 2,4-diaminotoluene, and a crosslinking agent divinyl benzene, a preparation method for the molecularly imprinted polymer, and application of the molecularly imprinted polymer to solid phase extraction separation. The 2,4-diaminotoluene molecularly imprinted polymer provided by the invention is more excellent in mechanical property, higher in specific volume, higher in adsorption acting force to 2,4-diaminotoluene, and higher in adsorption capacity to 2,4-diaminotoluene; the preparation method for the 2,4-diaminotoluene molecularly imprinted polymer is short in synthesis time, and the washing of the template molecule is easy; the molecularly imprinted polymer is high in solid phase extraction efficiency to 2,4-diaminotoluene and more thorough in adsorption.
Owner:SHENZHEN NTEK TESTING TECH
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