11 results about "M-dinitrobenzene" patented technology

The invention relates to the technical field of chemical synthesis, in particular to a preparation method of 3, 4 '-diaminodiphenyl ether.The preparation method comprises the steps that m-dinitrobenzene is dissolved with alcohol, and selective hydrogenation is conducted in a high-temperature and high-pressure reaction kettle with a palladium catalyst; and co-heating and refluxing the product after selective hydrogenation, a strong alkali aqueous solution, a first solvent and a phase transfer catalyst to obtain the m-aminophenol salt. M-aminophenol salt, p-nitroiodobenzene, alkali and a second solvent are subjected to a co-heating reaction, and then 3-amino-4 '-nitrodiphenyl ether is obtained through post-treatment; the method comprises the following steps: dissolving 3-amino-4 '-nitrodiphenyl ether with alcohol, carrying out hydrogenation reduction with a palladium catalyst, and carrying out post-treatment purification to obtain 3, 4'-diaminodiphenyl ether. According to the method, common m-dinitrobenzene is used as a raw material, m-nitroaniline is obtained through selective hydrogenation, m-aminophenol salt is prepared through the m-nitroaniline, then etherification reaction is carried out, the reaction yield is higher, the purity is better, and side reactions are few.

The invention relates to the technical field of organic chemical synthesis, in particular to a preparation method of 3, 4 '-diaminodiphenyl ether.The preparation method comprises the steps that S1, under inert gas and in a first solvent, m-dinitrobenzene and p-acetamidophenol are subjected to a heating reaction under the condition of a weak base catalyst, and 3-nitro-4-acetamido diphenyl ether is prepared; s2, in a second solvent, the 3-nitro-4-acetamido diphenyl ether is subjected to a hydrogenation reduction reaction, and 3-amino-4-acetamido diphenyl ether is prepared; and S3, dissolving the 3-amino-4-acetaminodiphenyl ether in an alcohol solvent system, adding an aqueous solution of alkali, controlling the reaction temperature, carrying out a hydrolysis reaction, and after the reaction is finished, carrying out post-treatment to obtain the 3, 4 '-diaminodiphenyl ether. The preparation method provided by the invention has the advantages of easily available raw materials, low price, good selectivity and high product yield, and is more suitable for industrial production by comprehensively considering economical efficiency and safety.

The invention relates to the technical field of wastewater treatment, in particular to a nitrobenzene-containing wastewater treatment method which comprises the following steps: performing multi-stage cooling crystallization on nitrobenzene-containing wastewater to obtain mixed dinitrobenzene solid and crystallized filtrate; heating, pressurizing, oxidizing and hydrolyzing the crystallized filtrate to obtain treated water; the nitrobenzene-containing wastewater is prepared from the following components in percentage by mass: 0.5 to 1.5 percent of o-dinitrobenzene, 0.3 to 1.0 percent of m-dinitrobenzene, 0.3 to 1.0 percent of p-dinitrobenzene and 3 to 10 percent of nitrobenzene. According to the treatment method, efficient purification and resource utilization of the nitrobenzene wastewater can be achieved, meanwhile, the treatment cost and the environmental risk are reduced, and the treatment method for the nitrobenzene-containing wastewater is efficient, economical and environmentally friendly. The treated wastewater can directly enter a conventional microbiological treatment system, and the problem that microbiological degradation is difficult does not exist.

This invention belongs to the field of fine chemical synthesis technology and relates to a method for preparing 2,4-diaminodiphenylamine, an intermediate in p-phenylenediamine antioxidants. Aniline and m-dinitrobenzene undergo a catalytic nucleophilic substitution reaction under negative pressure to obtain a reaction system with 2,4-dinitrodiphenylamine as the main product. The reaction system with 2,4-dinitrodiphenylamine as the main product is diluted with methanol and then subjected to catalytic hydrogenation. After the reaction, post-treatment yields 2,4-diaminodiphenylamine. This invention uses m-dinitrobenzene as the reactant, which is halogen-free and does not produce halogen-containing wastewater. It also has lower requirements for the corrosion resistance of production equipment, higher atom economy, and is more in line with the concept of green chemistry. The solvent and catalyst in this invention are recyclable, resulting in low cost.

The invention relates to the technical field of organic chemical synthesis, in particular to a preparation method of 3, 4 '-diaminodiphenyl ether.The preparation method comprises the steps that S1, under inert gas and in a first solvent, m-dinitrobenzene and p-acetamidophenol are subjected to a heating reaction under the condition of a weak base catalyst, and 3-nitro-4-acetamido diphenyl ether is prepared; s2, in a second solvent, the 3-nitro-4-acetamido diphenyl ether is subjected to a hydrogenation reduction reaction, and 3-amino-4-acetamido diphenyl ether is prepared; and S3, dissolving the 3-amino-4-acetaminodiphenyl ether in an alcohol solvent system, adding alkali and water, controlling the reaction temperature, carrying out a hydrolysis reaction, and after the reaction is finished, carrying out post-treatment to obtain the 3, 4 '-diaminodiphenyl ether. The preparation method provided by the invention has the advantages of easily available raw materials, low price, good selectivity and high product yield, and is more suitable for industrial production by comprehensively considering economical efficiency and safety.

The present invention discloses an industrially feasible and environmentally friendly process for the preparation of m-anisidine (Formula I) from m-dinitrobenzene (Formula III). Further, the present invention discloses a process for the preparation of m-anisidine (Formula I) from m-nitroanisole (Formula II).

The present invention relates to the technical field of chemical synthesis, and in particular to a preparation method of 3,4'-diaminodiphenyl ether, the preparation method being: m-dinitrobenzene is dissolved in alcohol, and selective hydrogenation is performed with a palladium catalyst in a high temperature and high pressure reactor; the product after selective hydrogenation is co-heated and refluxed with a strong alkali aqueous solution, a first solvent, and a phase transfer catalyst to obtain m-aminophenol salt. m-aminophenol salt, p-nitroiodobenzene, an alkali, and a second solvent are co-heated and reacted, and then 3-amino-4'-nitrodiphenyl ether is obtained by post-treatment; after 3-amino-4'-nitrodiphenyl ether is dissolved in alcohol, hydrogenation reduction is performed with a palladium catalyst, and then 3,4'-diaminodiphenyl ether is obtained by post-treatment purification. By using common m-dinitrobenzene as a raw material, m-nitroaniline is obtained by selective hydrogenation, and then m-aminophenol salt is prepared by m-nitroaniline, and then etherification reaction is performed, and the reaction yield is higher, the purity is better, and the side reaction is less.

This invention relates to a method for preparing 2',4-dichloro-2-aminodiphenyl ether, belonging to the field of chemical synthesis technology. The preparation method is as follows: S1, m-dinitrobenzene undergoes selective hydrogenation to obtain m-nitroaniline; S2, in a solvent, m-nitroaniline reacts with N-chlorosuccinimide to obtain 2-chloro-5-nitroaniline; S3, 2-chloro-5-nitroaniline, o-nitrophenol, a base, and a solvent undergo a co-heated reaction to obtain 2',4-dinitro-2-aminodiphenyl ether; S4, 2',4-dinitro-2-aminodiphenyl ether is dissolved in a solvent, and FeCl3 solution, sodium chloride, and Oxone are added. The reaction is catalyzed under ultraviolet light to obtain 2',4-dichloro-2-aminodiphenyl ether. The preparation method of this invention uses readily available raw materials, has good reaction efficiency, produces less waste, is cleaner and more environmentally friendly, and has a high conversion rate, making it suitable for industrial application.

This invention relates to the field of wastewater treatment technology, specifically to a method for treating nitrobenzene-containing wastewater. The method involves: subjecting the nitrobenzene-containing wastewater to multi-stage cooling crystallization to obtain mixed dinitrobenzene solids and a crystallized filtrate; subjecting the crystallized filtrate to heating and pressurizing oxidation hydrolysis to obtain treated water; the nitrobenzene-containing wastewater comprises 0.5%-1.5% by mass of o-dinitrobenzene, 0.3%-1.0% by mass of m-dinitrobenzene, 0.3%-1.0% by mass of p-dinitrobenzene, and 3%-10% by mass of mononitrobenzene. This treatment method achieves efficient purification and resource utilization of nitrobenzene wastewater while reducing treatment costs and environmental risks, making it a highly efficient, economical, and environmentally friendly method for treating nitrobenzene-containing wastewater. The treated wastewater can directly enter a conventional microbial treatment system without encountering difficulties in microbial degradation.

The invention relates to a preparation method of 2 ', 4-dichloro-2-aminodiphenyl ether, and belongs to the technical field of chemical synthesis. The preparation method comprises the following steps: S1, carrying out selective hydrogenation reaction on m-dinitrobenzene to prepare m-nitroaniline; s2, in a solvent, the m-nitroaniline and the N-chlorosuccinimide are subjected to a reaction, and 2-chloro-5-nitroaniline is prepared; s3, carrying out a co-thermal reaction on the 2-chloro-5-nitroaniline, o-nitrophenol, an alkali and a solvent to prepare 2 ', 4-dinitro-2-aminodiphenyl ether; s4, dissolving the 2 ', 4-dinitro-2-aminodiphenyl ether in a solvent, adding a FeCl3 solution, sodium chloride and Oxone, and performing catalytic reaction under the ultraviolet light condition to prepare the 2', 4-dichloro-2-aminodiphenyl ether.The preparation method has the advantages that raw materials are easy to obtain, the reaction effect is good, few three wastes are generated, the reaction is cleaner and greener, the conversion rate is high, and the 2 ', 4-dichloro-2-aminodiphenyl ether is suitable for industrial application.

The present invention provides a method for synthesizing 1,3-cyclohexanediamine. The method comprises the following steps: (1) using m-dinitrobenzene as a raw material and cyclohexylamine as a solvent, carrying out a liquid-phase hydrogenation reaction of m-dinitrobenzene with hydrogen under a first catalyst and first reaction conditions, and filtering after the reaction is completed to obtain a 1,3-phenylenediamine hydrogenation solution; (2) carrying out a liquid-phase hydrogenation reaction of the 1,3-phenylenediamine hydrogenation solution with hydrogen to generate a 1,3-cyclohexanediamine reaction solution under a second catalyst, an auxiliary agent and second reaction conditions, wherein the second catalyst is a zinc-modified Ru / Al 2 O 3 catalyst, and the second reaction conditions include: the reaction temperature is 100-150 °C, and the reaction pressure is 5-10 Mpa. When the method for synthesizing 1,3-cyclohexanediamine provided by the present invention is used, the content of trans-1,3-cyclohexanediamine obtained is high, and the zinc-modified Ru / Al 2 O 3 catalyst has good stability and can be reused for many times.