67 results about "O-chloroaniline" patented technology

The invention belongs to the production field of catalytic hydrogenation, and particularly discloses a production method for preparing chlorinated aniline via the chlorination of nitrobenzene hydrogenation by utilizing a solvent-free process. Chlorinated nitrobenzene is used as a raw material. The method is characterized in that under the existence of a catalyst and an aiding agent, the chlorinated nitrobenzene reacts with hydrogen at the temperature of 80 to 100 DEG C and under the pressure of 0.3 to 2.5 MPa, wherein a solvent is not added; and after the reaction is finished, the water diversion treatment is carried out, thereby obtaining the chlorinated aniline. The catalyst containing 1% of Pt/C precious metal is developed independently, wherein the adding amount of the catalyst accounts for 0.05% to 20% of that of the chlorinated nitrobenzene as the raw material. The aiding agent is a mixture of ethanol amine and pyridine, wherein the adding amount of the aiding agent accounts for 0.01% to 10% of that of the chlorinated nitrobenzene as the raw material. For the obtained o-chloroaniline, the chromatographic purity is above 99.5%, and the dechlorination quantity can be controlled within 0.1%. For the obtained 2,5-dichloroaniline, the chromatographic purity is above 99%, and the dechlorination quantity can be controlled within 0.1%. For the obtained 3,4-dichloroaniline, the chromatographic purity is above 99%, and the dechlorination quantity can be controlled within 0.1%.

The invention discloses a method for resourceful treatment of 3,3'-dichlorobenzidine hydrochloride wastewater, in which a chemical technology is adopted for the resourceful treatment of 3, 3'-dichlorobenzidine hydrochloride wastewater, in order that hydrochloric acid and sulphuric acid in the wastewater can be recycled, a by-product of o-chloroaniline sulfate is obtained, and the environment pollution caused by waste discharge is prevented. The method for resourceful treatment comprises that (1) first, the wastewater is evaporated, so that the chlorine hydride in the wastewater is separated and the wastewater is concentrated; (2) the chlorine hydride and water evaporated is rectified and separated, so that the chlorine hydride can be concentrated and reused, the vapor containing little chlorine hydride is recycled by condensing; (3) the wastewater concentrated by evaporating is decolored, and the colored substances contained are removed; (4) the wastewater is cooled for crystallization after being decolored, so that the o-chloroaniline sulfate is separated, and the purified sulphuric acid is obtained and reused. The invention discloses the structure of a device for resourceful treatment technique at the same time.

The invention provides a high dispersed loaded nano-metal Ni catalyst and a preparation method thereof, and belongs to the technical field of preparation of metal nano-particles. The bridging role of L-cysteine is utilized, the co-precipitation method is adopted for firstly preparing a NiAl-layered double-metal hydroxide/polyacrylic acid surface functional carbon nano-tube complex precursor, and then the high dispersed Ni metal catalyst loaded by carbon nano-tubes is further obtained by reducing the precursor through hydrogen. The loaded nano-metal Ni catalyst is formed by uniformly loading the mixture of Ni nano-particles and amorphous Al2O3 on the surface of the carbon nano-tubes, wherein the weight percentage content of the Ni is 3-30%, the weight percentage content of the amorphous Al2O3 is 1-10%, and the weight percentage content of the carbon nano-tubes is 60-95%; and the particle size distribution of the Ni nano-particles is 6-12nm. The catalyst is applied in hydrogenation reaction of o-chloronitrobenzene and can enable the o-chloronitrobenzene to perform selective hydrogenation for further generating o-chloroaniline, thereby showing good catalytic hydrogenation performance.

The invention belongs to the technical field of fine chemical engineering, and relates to a method for preparing o-chloroaniline by adopting liquid-phase catalytic hydrogenation of o-nitrochlorobenzene. A microchannel reaction device is adopted in reaction, and ortho-nitrochlorobenzene, a solvent and a catalyst react with hydrogen by adopting a slurry feeding mode at 50-150 DEGC under the pressure of 0.5-1.2MPa, so as to obtain the o-chloroaniline. The preparation technology of the o-chloroaniline has the advantages that feed is continuous, the reaction condition is flexible to change, mass transfer effect is good, a reactant fully contacts with a catalyst, the side reaction is reduced, and the like.

A process for preparing O-chlorophenylamine from O-chloronitrobenzene features that under existance of alcohol and the catalyst chosen from Ru/C, non-crystalline NiB, Ni-Fe-B and Ni-Co-B, the O-chloronitrobenzene takes part in catalytic hydrogenation reaction at 150-250 deg.C and then is post-treated to obtain said product. It has high output rate.

The invention relates to a simple and convenient preparation method of a key intermediate (2-methyl-4-amino-5-amino methyl pyrimidine) for the vitamin B1. According to the method, lewis acid is used for catalyzing addition condensation reaction of acetamidine and 3-formyl amino ethyl cyanide and then catalyzing reaction of the condensation product and triethyl orthoformate to introduce a formyl chiral auxiliary, an imdo group and the formyl chiral auxiliary are subjected to ring formation to form 2- methyl-4-formyl amino-5- amino methyl pyrimidine, and finally basic hydrolysis is performed, so that 2-methyl-4-amino-5-amino methyl pyrimidine is obtained. The reaction procedures are carried out sequentially by adopting the one-pot method, the products in each step require no separation and purification, and the operation is simple and convenient. According to the method, highly toxic o-chloroaniline and other phenylamine compounds are not used, so that residue of o-chloroaniline compounds in the vitamin B1 product can be completely avoided. Meanwhile, the production wastewater is less and the yield is high.

The invention discloses a method and a device for producing o-chloroaniline without a solvent. The method utilizes o-chloronitrobenzene as a raw material, a dechlorination inhibitor as an assistant 1, ammonia water as an assistant 2 and a platinum-carbon catalyst. At a hydrogenation liquid pH of 6-8, under the pressure of 0.5-0.9Mpa, at a temperature of 85-105 DEG C, hydrogen is fed into a reactor and the reaction system undergoes a continuous reaction in the reactor; then the hydrogenation liquid is collected in a hydrogenation liquid tank by a catalyst filter; the catalyst filtered by the catalyst filter is blown back into the reactor by the catalyst filter for recycle; and the hydrogenation liquid subjected to water separation is fed into a rectification system and then is rectified so that a qualified product is obtained. The method and the device have the advantages of simple processes, low production cost, high automation degree, high yield, high output, high reaction selectivity, good product quality, mild reaction conditions, good safety, low labor intensity, no pollution, and easy popularization.

The invention relates to an environment friendly method for reduction producing o-chloroaniline with iron powder. The method comprises adopting o-nitrochlorobenzene as the raw material and the iron powder as a reducing agent; separating o-chloroaniline, water andiron mud by vacuum distilling to obtain a coarse o-chloroaniline product; and refining by rectifying to obtain o-chloroaniline. The method solves the defects in the prior art on heavy pollution and high energy consumption, and implements the clear production of o-chloroaniline.

The invention provides an N,N-single ligand metal catalyst with three-dimensional structure and a preparation method thereof. The catalyst has a structural general formula as below. Mt represents nickel, palladium, cobalt, iron or copper metal atom; R1 represents bromine, chlorine, iodine, phenyl group, propyl group, butyl group, phenyl group, naphthyl group, methoxy group or ethoxy group; when R2 is aromatic amine, it represents aniline, naphthylamine, p-methylaniline, p-chloroaniline, p-fluoroaniline, p-fluoroaniline, p-bromoaniline, p-nitroaniline, o-bromoaniline, o-chloroaniline, o-nitraniline, 2,6-dichloroaniline, 2,6-difluoroaniline, 2,6-dibromoaniline, 2,6-dinitroaniline, 2,6-dimethylaniline, 2,6-diisopropyl aniline, 2,4-difluoroaniline, 2,4-dibromoaniline, 2,4-dichloroaniline, 2,4,6-trichloroaniline, 2,4,6-tribromo aniline, 2,4,6-trifluoroaniline, 2,4,6-trinitroaniline, 6-hydroxynaphthylamine, 1-aminoindan, fluoreneamine or 4-nitro naphthylamine; and when R2 is aliphatic amine, it represents ethylamine, propylamine, butylamine, heptylamine, isopropylamine, tert-butylamine or cyclohexylamine. The preparation method is simple, less in by-products, and environmentally friendly.

The invention discloses a method for regenerating a catalyst for synthesizing o-chloroaniline. The method for regenerating the catalys specifically includes the following steps of: filtering a palladium-carbon catalyst out in a filter which is provided with a metal sintered tube and arranged in a final-stage kettle of four-stage series hydrogenation kettles, introducing the palladium-carbon catalyst into an alkaline washing kettle, conducting alkaline washing on the palladium-carbon catalyst with a hot alkaline solution, introducing the alkaline-washed palladium-carbon catalyst into an ultrasonic cleaner to perform ultrasonic cleaning, introducing the ultrasonic-cleaned palladium-carbon catalyst into a water washing kettle for water washing, putting the water-washed palladium-carbon catalyst into an oven for drying and water removal, and then raising the temperature and calcining the dried palladium-carbon catalyst to obtain the dried and regenerated palladium-carbon catalyst. According to the method for regenerating the catalyst for synthesizing the o-chloroaniline, the useful palladium-carbon catalyst can be effectively recycled, the content of o-phenylenediamine obtained throughthe catalysis of the palladium-carbon catalyst is 98% or above, the synthesis cost is saved, and the economic benefit is improved; besides, the method and the process design of the regeneration of the catalyst used for synthesizing the o-chloroaniline are optimized, and requirements of the industrial design are met.

The invention provides ano-chloroaniline preparation method, wherein the raw materials comprise: o-nitrochlorobenzene, a catalyst, dicyandiamide, a solvent, nitrogen and hydrogen. According to the invention, Ru/C is used as the catalyst, and has characteristics of simple components, stable activity and high selectivity, and dicyandiamide is used as the dechlorination inhibitor, so that the dechlorination side reaction is effectively inhibited, the conversion rate is high, and the selectivity is high; by improving the structure of the rectifying tower, the vapor-liquid mass transfer performancein heat transfer and mass transfer is improved, and the contact area between the gas phase and the liquid phases is increased by utilizing the auxiliary member; the turbulent flow degree is effectively increased through the inflow weir having the step structure and the turbulent flowblock, so that the mass transfer and heat exchange efficiency and the mass transfer and heat exchangerate between the gas phase and the liquid phases are improved; and the treatment and circulation capacities of the liquid phase are improved through the circulation tank, and the gas-liquid phase contact time is favorably prolonged by using the baffle arrangement of the downcomer and the inner diameter change, so that the yield and the purity of o-chloroaniline are improved.

The invention discloses a preparation method for N-(2- chlorine-4-phenyl)-4- chlorine-3-trifluoromethyl benzene sulphonamide. The preparation method is as follows: performing amino sulfonylation reaction to 4 - chlorine-3-trifluoromethyl benzene sulfonyl chloride and o-chloroaniline in the toluene solution in the presence of catalyst to acquire N-(2- chlorine-4-phenyl)-4- chlorine-3-trifluoromethyl benzene sulphonamide; and then, performing nitratlon reaction in the presence of nitric acid/sulphuric acid to acquire flusulfamide with the product purity more than 99%. The preparation method improves the reaction yield, reduces the production danger, and improves the production process on the basis of improving the reaction yield.

The invention discloses a method of synthesizing 3,3'-dichloro-4,4'-diaminodiphenylmethane by using heteropoly acid. The method comprises the following steps: (1) adding o-chloroaniline and a formaldehyde solution into a reaction vessel in a room temperature; (2) adding a heteropoly acid catalyst into the reaction vessel; (3) under a magnetic stirring condition, performing heating to ensure the temperature in a range of 50-160 DEG C and performing a reaction for 0.5-8 hours; (4) after the reaction is completed, performing cooling to the room temperature, performing pumping filtration, removing the filtrate, and collecting the filter cake; and (5) performing recrystallization on the obtained filter cake by using an organic mixed solvent, and performing filtering and drying to obtain the solid heteropoly acid synthesized 3,3'-dichloro-4,4'-diaminodiphenylmethane. The method provided by the invention is mild in condition, simple in operation, high in yield and good in product quality.

The invention discloses a method for synthesizing 1-(2,4-dichlorophenyl)-3-methyl-4-difluoromethyl-1,2,4-triazole-5-ketone. The method comprises the following steps: with o-chloroaniline as a raw material, carrying out diazotization, reduction and salification so as to synthesize o-chlorophenylhydrazine hydrochloride, carrying out alkali neutralization so as to prepare free o-chlorophenylhydrazine, subjecting o-chlorophenylhydrazine, acetaldehyde, sodium cyanate and sodium hypochlorite to condensation, cyclization and oxidation reactions so as to generate 1-o-chlorophenyl-3-methyl-1H-1,2,4-triazole-5-ketone, subjecting 1-o-chlorophenyl-3-methyl-1H-1,2,4-triazole-5-ketone to salification, potassium fluorination and chlorination reactions so as to obtain 1-(2,4-dichlorophenyl)-3-methyl-4-difluoromethyl-1,2,4-triazole-5-ketone (a sulfentrazone intermediate). The synthetic method provided by the invention uses o-chloroaniline as the raw material, can synthesize an intermediate with small steric hindrance and few impurities, improves the yield, has the advantages of easily-available and cheap raw materials, mild reaction, simple and convenient operation and high safety, and facilitatesindustrial production.