2713 results about "Formic Aldehyde" patented technology

A formaldehyde-free aqueous binder composition comprises a binder component (A) obtainable by reacting at least one alkanolamine with at least one carboxylic anhydride and, optionally, treating the reaction product with a base; and a binder component (B) which comprises at least one carbohydrate. The binder composition is particularly useful for bonding mineral fiber products.

An aqueous binder composition containing a water-soluble and substantially infinitely water-dilutable free radical polymerized adduct of a monomeric carboxylic acid component and a monomeric hydroxyl component, polymerized in the presence of a chain transfer agent, and the related method of its use for making glass fiber products, especially fiberglass insulation.

An environmentally beneficial method of producing methanol from varied sources of carbon dioxide including flue gases of fossil fuel burning powerplants, industrial exhaust gases or the atmosphere itself. Converting carbon dioxide by electrochemical reduction produces formic acid acid and some formaldehyde and methanol mixtures. The formic acid can be used as source of carbon as well as hydrogen to produce methanol, dimethyl ether and other products.

A method and apparatus for preparing purified terephthalic acid and, optionally, isophthalic acid from mixed xylenes. The method of the present invention purifies the oxidation reactor effluent containing a mixture of terephthalic acid and isophthalic acid as well as minor amounts of 4-carboxybenzaldehyde (4-CBA), 3-carboxybenzaldehyde (3-CBA), and toluic acid isomers, to produce purified terephthalic acid and, optionally, purified isophthalic acid in an integrated process.

The invention discloses an oxa-phosphaphenanthrene flame retardant compound containing the sym-triazine structure and a preparation method thereof. The method is characterized in that an intermediate is synthesized from 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide(DOPO) and p-hydroxybenzaldehyde as raw material by the solution method, and then reacts with cyanuric chloride in the presence of phase transfer catalyst to obtain a 2,4,6-tri(4-(10-methenyl hydroxy-9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide)phenoxy)-1,3,5-triazine product. The compound is white crystal, and has a melting point of 166 to 169 DEG C, good thermal stability and high flame retardation efficiency, and can be adopted as a reactive flame retardant for the flame retardation of thermosetting resins such as epoxy resin, polyurethane and the like, and also as an additive flame retardant for the flame retardation of engineering plastics such as ABS, nylon and the like.

The invention discloses a synthetic method of a covalent organic framework (COF) material. The method comprises the following steps: after mixing 1,3,5-benzenetricarboxaldehyde with 2,5-di(N,N-dimethyl)amino-1,4-benzdihydrazide uniformly in an organic solvent, reacting in the presence of a catalyst acetic acid to obtain the COF material, wherein the mole ratio of 1,3,5-benzenetricarboxaldehyde to 2,5-di(N,N-dimethyl)amino-1,4-benzdihydrazide is 1:(0.5-3). The COF material obtained by adopting the method has relatively large specific surface area and regular open framework structure with adjustable diameter, thus being beneficial for mass transfer of reactants and products in photoabsorption and catalytic processes; the material can serve as a photocatalyst and can increase the yield of the dehydrogenative coupling reaction between 2-phenyl-1,2,3,4-tetrahydroisoquinoline and nitromethane from 39% in the absence of catalysts to 89%.

The present invention provides thermosetting aqueous binder compositions of one or more cyclic enamine, including bis-enamines and di- or higher functional enamines, optionally containing a water soluble or dispersible or dispersible primary amine compound. The binders are at least substantially formaldehyde free, need no polycarboxylic or polycarboxylate component, and yet provide excellent hot wet tensile strength when cured for as little time as a minute or less in use.

The invention relates to an organic-inorganic composite combined advanced monolithic refractory which has the formula of 40 to 56 percent of 5-1mm corundum or bauxite, 12 to 30 percent of 1-0.0088mm corundum or bauxite, 16 to 25 percent of corundum or bauxite with d90 less than 0.088mm, 0 to 5 percent of alpha alumina micropowder, 1 to 8 percent of hydratable alumina, 1 to 6 percent of siliceous dust, 0 to 2 percent of calcium aluminate cement, 0.05 to 0.4 percent of external efficient water reducing agents (polycarboxylic acid plus sulfonation naphthaldehyde polymer plus sulfonation melamine polymer), 1 to 6 percent of latex of the system of external polyacrylic acid, 1 to 6 percent of external water and 0 to 3 percent of external heat-resistant steel fiber. Casting materials of the invention have excellent performances of condensation, hardening, demoulding, drying and heating and are suitable for high-temperature furnace projects with changeful field conditions.

The invention discloses a sulfide functionalized covalent organic frame material, The material has a structural unit shown in the specification, and is obtained by the following steps: adding 2,5-Bis(3-(ethylthio)propoxy)-terephthalohydrazide and benzenetricarboxaldehyde into a mixed solvent of 1,4-dioxane and mesitylene, adding an aqueous acetic acid solution into the above mixture and reacting at 120 DEG C for 1-3 days. The material has a mesoporous structure, has BET specific surface area of 470-480 m<2>?g<-1>, has good selective identification for mercury ions, and can be used for removal of the mercury ions.

The invention discloses an alkylphenol modified phenolic amide curing agent and a preparation method thereof. The alkylphenol modified phenolic amide curing agent comprises the raw components including phenol or phenol derivatives, methanal or paraformaldehyde, polyamine and fatty acid or fatty acid polymer. The preparation method comprises the following steps of: uniformly mixing the fatty acid or the fatty acid polymer and the polyamine, heating the mixture, cooling the mixture, adding the phenol or the phenol derivatives in the mixture, uniformly mixing the methanal or the paraformaldehyde with the mixture, heating the new mixture, and performing dehydration on the new mixture to obtain the product; or the preparation method comprises the following steps of: uniformly mixing the phenol or the phenol derivatives, the polyamine and the methanal or the paraformaldehyde, heating the mixture, adding the fatty acid or the fatty acid polymer into the mixture, heating the new mixture, and performing the dehydration on the new mixture to obtain the product. The curing agent disclosed by the invention is very strong in salt spray corrosion resistance, is superior to polyamide curing agent and curing agent products of modified phenolic aldehyde amide resin and mixtures of the modified phenolic aldehyde amide resin, and has good impact strength and flexibility as well as excellent water tolerance.

The invention discloses a toluene liquid-phase selective oxidation catalyst and a preparation method thereof. The catalyst is transition metal or rare earth vanadate which has the composition shown by MexVyO, wherein Me is one of transition metals of VIB, VIIB or VIIIB group; V is vanadium; and the molar ratio x / y of Me to V is 0.1 to 10. The catalyst provided by the invention can be used for toluene liquid-phase oxidation reaction, the conversion rate of the toluene is high and the main product is benzaldehyde; by changing the composition and modulating reaction conditions of the catalyst, the proportion of the benzaldehyde to benzoic acid in the product can be changed; the catalyst does not pollute equipment and environment; and a solved used in the reaction can be recovered and rational resource utilization is basically realized.

The present invention relates to a cost effective and industrially advantageous process for the preparation of 4-4(fluorophenyl)-6-isopropyl-2-(N-methyl-N-methylsulphonylamino)-5-pyrimidinecarboxaldehyde, referred to here as pyrimidine aldehyde of structural Formula I and to the use of this compound as intermediate for the preparation of rosuvastatin.

This invention relates to the use of a supplemental promoter in conjunction with a noble-metal-containing catalyst comprising a carbon support in catalyzing liquid phase oxidation reactions.In a particularly preferred embodiment, a supplemental promoter (most preferably bismuth or tellurium) is used in conjunction with a noble-metal-containing catalyst comprising a carbon support in a liquid phase oxidation process wherein N-(phosphonomethyl) iminodiacetic acid (i.e., “PMIDA”) or a salt thereof is oxidized to form N-(phosphonomethyl)glycine (i.e., “glyphosate”) or a salt thereof. The benefits of such a process include oxidation of the formaldehyde and formic acid by-products, and, consequently, decreased final concentrations of those by-products as well as other undesirable by-products, most notably N-methyl-N-(phosphonomethyl)glycine (i.e., “NMG”).

The invention relates to an oxa-phosphaphenanthrene flame retardant containing cyclotriphosphonitrile structure, and a preparation method and application thereof. The preparation method comprises the following steps: under the actions of K2CO3 and acetone, reacting hexachlorocyclotriphosphonitrile and 2,2'-diphenyldiphenol to obtain an intermediate I, reacting the intermediate I with p-hydroxybenzaldehyde to obtain an intermediate II, and reacting the intermediate II and DOPO (9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) to obtain the target compound. The appearance of the compound is white, and the melting point is 186-188 DEG C; and the product has the advantages of favorable thermal stability, high flame retardancy and high purity (up to 99%). The invention has the advantages ofaccessible raw materials and advanced technique, and can easily implement industrial production. The flame retardant can be used as a reactive flame retardant to be connected to epoxy resin, polyurethane and other thermosetting resins, and can also be used as an additive flame retardant for halogen-free flame retardancy of ABS (acrylonitrile-butadiene-styrene), nylon and other engineering plastics with high heat resistance requirements.

A compound (8) represented by the formula: (8)wherein R1 represents a 6- to 14-membered aromatic hydrocarbon ring group which may have a substituent; and n represents 0 to 2, can be produced with good efficiency by reacting a compound (3) represented by the formula: (3)wherein R1 and n are as defined above; and Q represents a single bond or —CH(Y)— where Y represents a hydrogen atom or a C1-6 alkyl group] with 3-methoxy-4-(4-methyl-1H-imidazol-1-yl)benzaldehyde in the presence of a base.

An acetal compound may be formed by the method of reacting a substitiuted or unsubstituted benzaldehyde, a polyhydric alcohol, and an at least one acid catalyst at ambient temperatures, in a homogenous reaction media in the presence of at least one water miscible organic solvent. The molar ratio of the acid catalyst to the benzaldehyde may be less than about 0.6 to 1, respectively, of acid catalyst to benzaldehyde.

The invention discloses a benzothiazole-cyanophenyl compound serving as a hydrazine fluorescence probe. The benzothiazole-cyanophenyl compound has a structural formula as shown in (I); the compound is prepared by performing cyclodehydration with bromobenzaldehyde and 2-amino-4-chloro thiophenol serving as the raw materials, then performing coupled reaction in order to connect with a bromobenzaldehyde derivate, and finally performing Knoevenagel reaction with malononitrile. The benzothiazole-cyanophenyl compound has the advantages that the raw materials are low in price and easy to gain, the synthetic route is simple, and the yield is relatively high; rigid structures such as benzothiazole and phenylacetylene groups are introduced into such a fluorescence probe, thus high fluorescence quantum efficiency is realized, and relatively high thermal stability and dissolubility are brought. The probe adopts the photoinduced charge transfer mechanism and the conjugate passivation mechanism, therefore, a response range respect to hydrazine can be expanded; the probe has the characteristics of being fast in response, high in sensitivity and high in selectivity, is suitable for being applied to safety detection of foods as well as safety detection of a laboratory, in particular applied to industrial wastewater monitor; and the probe has a wide application prospect in environment monitoring, ecological protection, disease diagnosis, industrial production and pollution discharge inspection.

An environmentally friendly, formaldehyde-free, aqueous binder composition that includes a carbohydrate, a crosslinking agent, and a pre-reacted product of an alcohol or polyol and monomeric or polymeric polycarboxylic acid or polyglycerol is provided. The pre-reacted product may include glycerol and esters of citric acid such a monoglyceryl citrate, diglyceryl citrate, and triglyceryl citrate as well as other higher molecular weight citric acid-based esters. The inclusion of the pre-reacted product in the binder composition helps to speed the crosslinking reaction, induces faster water evaporation, decreases the viscosity of the binder, helps to reduce the amount of water needed for application of the binder, decreases tackiness, and helps to achieve a maximum vertical expansion of the insulation pack in the transfer zone. The binder composition may be used in the formation of insulation materials and non-woven chopped strand mats.

The invention provides a chiral sulfinylamine monophosphine and a preparation method thereof. The preparation method comprises the following steps: carrying out a condensation reaction of 2-disubstituted phosphinoaryl(heteroaryl)formaldehyde (ketone) 2 and chiral sulfonamide 3 to obtain a compound 4, and reacting the compound 4 with a nucleophilic reagent to prepare a compound 1; or carrying out a condensation reaction of aldehyde (ketone) 5 and the chiral sulfonamide 3 to obtain imine 6, and reacting the imine 6 with a 2-disubstituted phosphinoaryl(heteroaryl) metal reagent to obtain the compound 1; or reacting the imine 6 with the 2-disubstituted phosphinoaryl(heteroaryl) metal reagent to obtain a compound, and reducing the compound to obtain the compound 1; or carrying out a condensation reaction of 2-substituted phosphinoaryl(heteroaryl)formaldehyde (ketone) 8 and the chiral sulfonamide 3 to obtain an imine compound 9, reacting the imine compound 9 with the nucleophilic reagent to obtain a compound 7, and reducing the compound 7 to obtain the compound 1. Different chiral sulfenamides and different metal reagents are used to conveniently obtain the optically pure compound of four configurations comprising (R,R), (R,S), (S,S) and (S,R). The above ligand has the advantages of simple skeleton, synthesis convenience and easy reconstruction, can be applied in various metal-catalyzed asymmetric reactions, and has a very high reaction activity and stereoselectivity.

The invention provides a method for preparing bromhexine hydrochloride, which comprises the steps as follows: (1) 2-amino-3,5-dibromo benzaldehyde and reducing agents are in a reduction reaction to generate 2-amino-3,5-dibromo benzyl alcohol; (2) 2-amino-3, 5-dibromo benzyl alcohol that is obtained in the step (1) reacts with chlorinating agents to generate 2, 4-bromine-6-chloride methylaniline; and (3) 2,4-bromine-6-chloride methylaniline obtained in the step (2) and N-methylcyclohexylamine are in an amination reaction, and then 2, 4-bromine-6-chloride methylaniline and HCl salification agents are in a salification reaction, so that bromhexine hydrochloride is obtained. The preparation method adopts multiple advanced technologies, is easy to get starting materials, and has the advantages of stable property of intermediates, extremely low environment pollution, high yield coefficient of products and high purity.

The invention discloses cardanol modified phenolic aldehyde foam and a preparation method of the cardanol modified phenolic aldehyde foam. The cardanol modified phenolic aldehyde foam is prepared by the following materials in parts by weight: 100 parts of a cardanol modified phenolic aldehyde resin, 4-7 parts of a surfactant, 6-10 parts of a foaming agent and 15-20 parts of a curing agent, wherein the cardanol modified phenolic aldehyde resin is a phenolic aldehyde resin obtained by performing a first step of reaction on cardanol and liquid formaldehyde under a basic catalyst condition, then, adding phenol and paraformaldehyde, and performing a second step of reaction under the basic catalyst condition, and at last, adding a hydroxymethylurea resin to react. According to the preparation method, on the basis of not affecting the heat conductivity coefficient and high fire resistance of the phenolic aldehyde foam, the density, water absorption and free formaldehyde of phenolic aldehyde foam plastic are reduced by the cardanol, the tenacity of phenolic foam is improved, and meanwhile, renewable plant resources are adequately used. The cardanol modified phenolic aldehyde foam can be used as a building heat-insulation, heat-preservation and fire-proof material, and is a product with good market prospect.

The invention relates to a method for analyzing (1R, 2R)-2-amino-1-(4-(methylsulfonyl)-phenyl)-1,3-propylene glycol as an important intermediate of florfenicol, which is chloramphenicol spectrum antibiotic special for animals. The method comprises the following steps of: performing a reaction of methylsulfonyl benzaldehyde and nitro alcohol at 0-40 DEG C in the presence of a chiral catalyst to obtain (1R, 2R)-2-nitro-1-(4-(methylsulfonyl)-phenyl)-1,3-propylene glycol; and reducing the (1R, 2R)-2-nitro-1-(4-(methylsulfonyl)-phenyl)-1,3-propylene glycol through hydrogen to obtain the intermediate. In the invention, the compound (1R, 2R)-2-amino-1-(4-(methylsulfonyl)-phenyl)-1,3-propylene glycol with a high e.e. value is obtained by adopting the chiral catalyst, and the compound has the advantages of strong reaction selectivity, high productivity, simple process, low cost, easy preparation of raw materials and low price, is suitable for industrial production, avoids chiral separation frequently used in industry at present and saves the raw materials and the cost. The compound (1R, 2R)-2-amino-1-(4-(methylsulfonyl)-phenyl)-1,3-propylene glycol is used for preparing florfenicol and can reduce the preparation cost.

The present invention discloses a synthesis method for a benzothiazole unit-based covalent organic framework material. The method comprises the following step of: in an organic solvent or an ionic liquid, performing a reaction on 2, 4, 6-trihydroxy benzenetricarboxaldehyde and 2, 6-diamino benzodithiazole to obtain the covalent organic framework material. The covalent organic framework material prepared by the method has a relatively large surface area and a regular channel structure, and is a good photocatalytic material; and the material can be used for cross-dehydrogenation coupling reaction for photocatalysis of N-aryl tetrahydroisoquinoline, and has good stability and an excellent catalytic effect.

A detection method of a nitrofuran metabolites and chloramphenicol multiresidue in shrimp belongs to the technical field of aquatic products detection. The method is as below: hydrolyzing a sample with hydrochloric acid, subjecting nitrofuran metabolites to derivatization by using 2-nitrobenzaldehyde, adjusting the pH value to 6.5-7.5, adding acetonitrile, adding an extraction salt package; conducting liquid-liquid extraction of a target compound by using acetonitrile; purifying and concentrating a supernatant; then determining by a liquid chromatography-tandem mass spectrometer, and quantifying by an internal standard method. The method uses a novel sample extraction and purification mode for simultaneous analysis and determination of two prohibited drugs with the highest detection rate in shrimp, overcomes the limitations of separate determination of two drugs in the detection method of the prior art, improves the extraction efficiency of chloramphenicol in actual positive samples, greatly improves the work efficiency, shortens the work time and saves reagent consumption and labor costs. The method adopts the isotope internal standard method for quantification, the determination result is more accurate and reliable, has high sensitivity, and good reproducibility and quantitative accuracy.

Alpha-olefins are manufactured in high yield and with very high selectivity by contacting ethylene with an iron complex of a selected 2,6-pyridinedicarboxaldehyde bisimine or a selected 2,6-diacylpyridine bisimine, and in some cases a selected activator compound such as an alkyl aluminum compound. Novel bisimines and their iron complexes are also disclosed. The alpha-olefins are useful as monomers and chemical intermediates.

A polyacetal resin composition comprises a polyacetal resin and a hetero atom-containing aliphatic carboxylic acid hydrazide. The proportion of the hetero atom-containing aliphatic carboxylic acid hydrazide may be about 0.001 to 20 parts by weight relative to 100 parts by weight of the polyacetal resin. The polyacetal resin composition may further comprise at least one member selected from the group consisting of an antioxidant, a heat stabilizer, a processing stabilizer, a weather (light)-resistant stabilizer, an impact resistance improver, a gloss control agent, an agent for improving sliding property, a coloring agent, and a filler. Such a resin composition improves stability of the polyacetal resin and inhibits formaldehyde emission.

The present invention relates to oral care compositions comprising stannous ions, a mint-type flavor oil, a protectant component that prevents generation of off odor and off taste in the composition, and orally acceptable carriers. The mint-type oils include peppermint, spearmint and corn mint. Suitable protectant components include copper salts and carbonyl compounds such as ascorbic acid; cis-jasmone; 2,5-dimethyl-4-hydroxy-3(2H)-furanone; 5-ethyl-3-hydroxy-4-methyl-2(5H)-furanone; vanillin; ethyl vanillin; anisaldehyde; 3,4-methylenedioxybenzaldehyde; 3,4-dimethoxybenzaldehyde; 4-hydroxybenzaldehyde; 2-methyoxybenzaldehyde; 4-methoxybenzaldehyde; benzaldehyde; cinnamaldehyde (3-phenyl-2-propenal); hexyl cinnamaldehyde; α-methyl cinnamaldehyde; ortho-methoxy cinnamaldehyde; α-amyl cinnamaldehyde; and combinations thereof. The oral care composition may be a dentifrice.

The invention provides mesoporous Pt / WO3 electro-catalyst and the preparation method thereof. The catalyst takes mesoporous WO3 as the catalyst carrier, mesoporous WO3 carrier material is prepared by a hard template of mesoporous silicon oxide, and then chloroplatinic acid solution is added into the mesoporous WO3 carrier material, metal platinum particles are restored and deposited in the hole channel of the mesoporous WO3 carrier material, thereby obtaining the mesoporous Pt / WO3 electro-catalyst. The preparation condition of the method is moderate, the operation is easy, the dispersion performance of the platinum particles is good, the synergistic catalytic effect can be formed with Pt, and compared with prior electro-catalyst, the novel catalyst has high carbinol electro-oxidation and catalytic activity and CO prevention performance.

A polyacetal resin composition comprises a polyacetal resin, and at least one carboxylic acid hydrazide selected from a saturated or unsaturated long-chain aliphatic carboxylic acid hydrazide, a saturated or unsaturated alicyclic carboxylic acid hydrazide, a dimer acid or trimer acid hydrazide, and an oxycarboxylic acid hydrazide corresponding to each of these hydrazides. The proportion of the carboxylic acid hydrazide may be about 0.001 to 20 parts by weight relative to 100 parts by weight of the polyacetal resin. The polyacetal resin composition may further comprise at least one member selected from an antioxidant, a heat stabilizer, a processing stabilizer, a weather (light)-resistant stabilizer, an impact resistance improver, a slip-improving agent, a coloring agent, and a filler. With the use of such a resin composition, stability of a polyacetal resin is improved, and formaldehyde emission is inhibited.

A process for the preparation of aromatic aldehydes containing fluorine, and more particularly, to a formylation process for fluorinated aromatic derivatives through the reaction of fluorinated benzenes with carbon monoxide and aluminum chloride at a relatively low pressure, a low temperature, and in the presence of at most a catalytic amount of an acid (such as aqueous hydrochloric acid) is herein disclosed. The resultant fluorinated benzaldehydes are useful as precursors to the formation of a number of different compounds, such as dyestuffs, flavorings, fragrances, herbicidal compounds, nucleating agents, polymer additives, and the like. The inventive method provides a very cost effective and safe procedure for producing such fluorinated benzaldehydes in very high yields.