44 results about "M-toluidine" patented technology

The invention discloses a preparation method for disperse red 343:1 dye. The preparation method comprises the following steps: 1) diazotization, to be specific, adding water into a reaction kettle, cooling with cooling water, adding sulfuric acid, and then, dropwise adding nitrosyl sulfuric acid; after completing adding the nitrosyl sulfuric acid, adding 2-amino-5, 6-dichloro benzothiazole, stirring, and performing standing to obtain diazonium salt; 2) coupling, to be specific, adding water, glacial acetic acid, sulfamic acid and peregal into a coupling bucket, adding N-ethyl-N-benzoyloxy ethyl m-toluidine, adding ice for cooling, pressing-in the diazonium salt, and coupling; 3) after completing the coupling, and adding water for heating; 4) performing press-filtering, and washing, so as to obtain dye filter cakes; 5) mixing the dye filter cakes and an auxiliary agent, so as to obtain the disperse red 343:1 dye. According to the invention, the disperse red 343:1 dye serves as a substitute object of disperse red 343, the preparation technology is simple, only one-time coupling reaction is performed, the process route is shortened, the waste water discharge is greatly reduced, the yield is increased, the cyanation reaction adopting plenty of virulent cyanide is avoided, the possibility for harming human beings and the environment is reduced, and the finally prepared disperse red 343:1 dye is high in light fastness and can meet the use requirements of textiles on high-solarization dye.

The invention relates to 100# lead-free aviation gasoline and a preparation method thereof. The 100# lead-free aviation gasoline comprises, by volume, 10-18% of industrial isopentane, 1-11% of light alkylated oil, 45-55% of industrial isooctane, 15-22% of toluene, 0-4% of m-xylene, 5-11% of cumene, 1.5-5.5% of aniline, 0.5-3.5% of N-methyl aniline and 0-3% of m-toluidine. The components are blended to form the finished product. Compared with the prior art, the 100# lead-free aviation gasoline does not contain lead and solves the problem of lead pollution of aviation gasoline. Through the optimized combination of the components, the 100# lead-free aviation gasoline quality is high and the 100# lead-free aviation gasoline satisfies the quality index requirements. The 100# lead-free aviation gasoline has a high economic value. The 100# lead-free aviation gasoline blending process is simple and is conducive to industrial production.

The invention relates to a preparation method of m-fluorotoluene, and the preparation method has the advantages of fewer steps, high yield and high purity of the obtained product. The preparation method of m-fluorotoluene provided by the invention comprises the following steps: (1) salt formation step: anhydrous hydrofluoric acid and m-toluidine are mixed at a mole ratio of (2-5):1 to obtain a mixture 1 through dripping the whole m-toluidine into anhydrous hydrofluoric acid within 7-10 hours at a constant rate and then reacting for 1-3 hours at 5-7 DEG C; (2) diazotization step: sodium nitrate is dripped into the mixture 1 at a mole ratio of sodium nitrate to m-toluidine in the salt formation step of (1-1.5):1 to obtain a mixture 2 through dripping the whole sodium nitrate into the mixture 1 within 8-10 hours at a constant rate and then reacting for 1-3 hours at 0-3 DEG C; and (3) thermal decomposition step: the mixture 2 is heated to decompose at 0-50 DEG C.

The invention discloses a treatment method of residues from a nitrotoluene rectification kettle. The method comprises the following steps: performing a hydrogenation reduction reaction on the residues from the rectification kettle and hydrogen in the presence of a catalyst, thereby generating methylaniline comprising three isomers, namely, o-toluidine, m-toluidine and p-toluidine, from the mononitrotoluene in the kettle residues and generating diaminotoluene comprising two isomerides, namely, 2,4-diaminotoluene and 2,6-diaminotoluene, from the dinitrotoluene in the kettle residues; and then performing rectification separation, thereby obtaining a methylaniline finished-product and a diaminotoluene finished-product. The method is simple in process, short in procedure, clean and environment-friendly, and realizes the rational utilization of waste resources, i.e., the products with high additional values are produced by utilizing low-value resources, thereby bringing economic benefits to enterprises. As a result, the recycling of waste materials, the energy conservation and the emission reduction are realized.

The invention belongs to the technical field of chemical waste water processing, and more specially relates to a method used for catalytic degradation of arylamine waste water using a photocatalysis material. According to the method, apatite is taken as a carrier, a nitrate hexahydrate, zinc nitrate hexahydrate, and sodium tungstate dehydrate are taken as raw materials, hydro-thermal reaction is adopted to prepare the nickel salt modified zinc tungstate photocatalysis material. The preparation method is simple; the obtained photocatalysis material is capable of degrading arylamines such as phenylamine, parachloroaniline, or m-toluidine, and the degradation rate of phenylamine is as high as 98.6%.

An accelerator mixture for peroxide hardeners, in particular an accelerator mixture for an organic peroxide-curing resin mixture, a two-component mortar system containing the same for chemical fastening and use of the same for chemical fastening of anchoring elements in boreholes are disclosed. Using a mixture of bis-N-substituted p-toluidines with bis-N-substituted anilines or bis-N-substituted m-toluidines, it is possible to provide a mortar composition for chemical fastening of anchoring elements in boreholes, which will have an improved low-temperature curing and improved load ratings at high temperatures with an extended gel time.

The invention provides preparation methods of an acid-doped pyrrole-m-toluidine copolymer and a modified anticorrosive coating. An acid-doped pyrrole-m-toluidine copolymer material is prepared by a chemical oxidative polymerization method, E-44 epoxy resin is modified with the pyrrole-m-toluidine copolymer material, the acid-doped pyrrole-m-toluidine copolymer material is added in the epoxy resin, Q235 carbon steel is coated with the modified epoxy resin, and the anticorrosive performance of the coated Q235 carbon steel is studied. When the volume ratio of pyrrole and m-toluidine is 2 to 1, the synthesized copolymer, as filler, is added in the epoxy resin to be used as a coating, and a coating layer of the coating is largest in resistance and smallest in corrosion current density, i.e. the corrosion resistance performance of the coating is the best. By passing through binding force rating, the coating can reach a primary standard and has very good constructability. The coating has dual advantages of polypyrrole and the m-toluidine and is very good in conductivity, good in anticorrosive performance, small in pollution and low in cost.

The invention discloses a process for preparing m-cresol by a nitrogen oxide gas, which comprises the following steps: infusing the nitrogen oxide gas in m-toluidine sulfate for carrying out diazotization, hydrolyzing in the presence of an organic solvent and under an acidic condition, carrying out flash evaporation on the acid phase under the condition of negative pressure, returning the acid phase to a salifying step, dehydrogenating and rectifying the organic phase to obtain m-cresol products. The invention uses the nitrogen oxide gas as a diazotizing agent and inorganic salts do not existin a waste acid so that the waste acid is possibly used industrially. The hydrolysis is carried out in the presence of the organic solvent, the m-toluidine generated by the hydrolysis is quickly dissolved in the organic phase, the side product tarry matters generated in the reaction is few, the yield of the m-toluidine is improved, the salt-free waste acid is subjected to the flash evaporation under the negative pressure at a certain temperature, organic matters are stripped while the reaction water is removed, sulfuric acid is used, the dosage of the sulfuric acid is reduced, the purity of the m-toluidine products prepared by the process of the invention is 99.7% and the yield is more than 90%.

The invention provides a preparation method of baquiloprim. The preparation method is mild in conditions, convenient to operate, high in yield and low in cost. Specifically the preparation method comprises the following steps: taking m-toluidine as an initial raw material, performing a Skraup reaction, nitration, and nitroreduction to obtain an intermediate 8-amino-7-methylquinoline; taking uracil as the initial raw material, and performing a Mannich reaction to obtain an intermediate 5-dimethylamine methyl uracil hydrochloride; performing condensation, Eschweiler-Clarke methylation, chlorination and aminolysis and the like on the intermediate 8-amino-7-methylquinoline and the intermediate 5-dimethylamine methyl uracil hydrochloride to synthesize baquiloprim. The preparation method is easily available in raw materials, easy to operate and favorable for industrialization production.

The invention discloses a high-strength clutch shifter material and a preparation method thereof. The preparation method comprise the following steps: 1) wood chips and plant ash are soaked in a hydrochloric acid solution, filtering is carried out for preparing a filter cake, a vapor treatment is carried out for the filter cake, in order to obtain a modifier; 2) bentonite and iron-ore slag are calcined, an activation treatment is carried out with existence of X-ray, in order to prepare an activator; 3) polycarbonate, an ethene-vinyl acetate copolymer, cellulose propionate, vinyl propionate, 1-butanol, nanometer magnesium oxide, rare earth oxide, potassium titanate whiskers, m-toluidine, anilino-methyl-triethoxysilane, pyrimidine, p-benzoquinone, dimethicone, the modifier and the activator are mixed, cooled, moulded and granulated, in order to obtain the high-strength clutch shifter material. The prepared clutch shifter material has excellent mechanical properties.

The invention relates to the technical field of purification of asymmetric substituted ethylenediamine, and particularly discloses a purification method of N-(2-aminoethyl)-N-ethyl m-toluidine, which comprises the following steps: adding ethyl acetate into an N (2-aminoethyl)-N-ethyl m-toluidine crude product, uniformly mixing, and heating to obtain an oil-water mixture; performing standing and cooling the oil-water mixture to separate out crystals from the oil-water mixture, and then controlling the vacuum degree to be -0.09-0.06 Mpa for filter pressing for 1 hour to 2 hours to obtain a primary filter cake and primary filter liquor; adding ethanol into the obtained primary filter cake, uniformly mixing, and then heating to obtain a mixture I; adding ethyl acetate into the mixture I, uniformly mixing, and stirring to obtain a mixture II; and carrying out pressure filtration on the obtained mixture II, standing and cooling the obtained filtrate, carrying out pressure filtration under control, and drying the filter cake obtained by pressure filtration to obtain the N (2-aminoethyl)-N-ethyl-m-toluidine refined product. The purification method provided by the invention has the advantages of simple operation and high yield and purity of the final product.

The invention provides preparation methods of an acid-doped pyrrole-m-toluidine copolymer and a modified anticorrosive coating. An acid-doped pyrrole-m-toluidine copolymer material is prepared by a chemical oxidative polymerization method, E-44 epoxy resin is modified with the pyrrole-m-toluidine copolymer material, the acid-doped pyrrole-m-toluidine copolymer material is added in the epoxy resin, Q235 carbon steel is coated with the modified epoxy resin, and the anticorrosive performance of the coated Q235 carbon steel is studied. When the volume ratio of pyrrole and m-toluidine is 2 to 1, the synthesized copolymer, as filler, is added in the epoxy resin to be used as a coating, and a coating layer of the coating is largest in resistance and smallest in corrosion current density, i.e. the corrosion resistance performance of the coating is the best. By passing through binding force rating, the coating can reach a primary standard and has very good constructability. The coating has dual advantages of polypyrrole and the m-toluidine and is very good in conductivity, good in anticorrosive performance, small in pollution and low in cost.

The invention relates to a method for continuously preparing m-cresol. The m-toluidine diazonium salt is continuously added to dilute sulfuric acid of 25 to 64 wt%, and the concentration of sulfuric acid in the reactor is controlled at 25 to 64 wt%, and the reaction temperature is 106 ~150°C to obtain m-cresol. The invention has the following advantages: not only the production cost is low, but also the finished product yield of m-cresol with a content ≥ 99.5% is above 84%, which is about 10% higher than that of the discontinuous preparation method. The reaction volume is small, and the volume of the hydrolysis reactor is only 2 / 5 of the intermittent production, which not only reduces investment, but also saves energy consumption and reduces operating costs. The invention can be carried out without solvent, saves the trouble of separating and recovering the solvent, and greatly reduces material consumption. The waste sulfuric acid produced by the hydrolysis reaction can be recycled as a raw material for the preparation of m-toluidine diazonium salt after being treated by the macroporous adsorption resin, which solves the problem of a large amount of waste acid discharge in the intermittent hydrolysis reaction.