58 results about "O-chloronitrobenzene" patented technology

The invention provides a preparation method of a nitrogen doped carbon-encapsulated core-shell structure ferro-nickel nano-catalyst and the application of the nitrogen doped carbon-encapsulated core-shell structure ferro-nickel nano-catalyst in catalyzing an o-chloronitrobenzene hydrogenation reaction. According to the method, the novel nitrogen doped carbon-encapsulated core-shell structure ferro-nickel nano-catalyst is prepared by synthesizing a ferronickel layered doubled hydroxide precursor with small grain size and high surface energy through a nucleation crystallization isolation method, evenly mixing the ferronickel layered doubled hydroxide precursor with a melamine and dicyandiamide mixed carbon material precursor, and finally self-reducing at high temperature. The nitrogen doped carbon-encapsulated core-shell structure ferro-nickel nano-catalyst is efficiently applied to the reaction where halogenated aniline is generated through catalytic hydrogenation of a nitro-halogen compound, and the conversion rate of o-chloronitrobenzene and the selectivity of o-chloroaniline are respectively up to 95-100% and 98-100%. The structure of the novel nitrogen doped carbon-encapsulated core-shell structure ferro-nickel nano-catalyst is unique and novel, the process is green and energy-saving, the structure of the catalyst is stable, and the catalyst has a broad application prospect.

The invention discloses a synthesis process of boscalid intermediate 2-(4-chlorphenyl)phenylamine. Chlorophenylboronic acid and o-chloronitrobenzene are taken as starting raw materials, and a main reaction consisting of the two steps of Suziki and hydrogenation reduction is carried out to prepare the 2-(4-chlorphenyl)phenylamine. 1, optimal reaction steps determined through continuous testing are adopted, a proper solvent is selected preferably, and the 2-(4-chlorphenyl)phenylamine is prepared at a proper temperature and under a proper pressure, so that a superior process, high yield and high working efficiency are realized, no noble metal coupling agent is needed, the environmental pollution is lowered, raw materials are readily available, and the production cost is lowered; 2, a target product is obtained by obtaining a solid through concentration and cooling, so that a posttreatment method is simplified effectively, and meanwhile the content and high yield of the product are ensured effectively; 3, the Suzuki reaction steps are simple, filtrate left after the reaction can be directly applied to a next-step hydrogenation reduction reaction, operation is easy, no pollutant waste is produced in the hydrogenation reduction reaction, and the environment and the health of operating personnel are protected.

The invention provides a preparation method of a nitrogen doped carbon-encapsulated core-shell structure ferro-nickel nano-catalyst and the application of the nitrogen doped carbon-encapsulated core-shell structure ferro-nickel nano-catalyst in catalyzing an o-chloronitrobenzene hydrogenation reaction. According to the method, the novel nitrogen doped carbon-encapsulated core-shell structure ferro-nickel nano-catalyst is prepared by synthesizing a ferronickel layered doubled hydroxide precursor with small grain size and high surface energy through a nucleation crystallization isolation method, evenly mixing the ferronickel layered doubled hydroxide precursor with a melamine and dicyandiamide mixed carbon material precursor, and finally self-reducing at high temperature. The nitrogen doped carbon-encapsulated core-shell structure ferro-nickel nano-catalyst is efficiently applied to the reaction where halogenated aniline is generated through catalytic hydrogenation of a nitro-halogen compound, and the conversion rate of o-chloronitrobenzene and the selectivity of o-chloroaniline are respectively up to 95-100% and 98-100%. The structure of the novel nitrogen doped carbon-encapsulated core-shell structure ferro-nickel nano-catalyst is unique and novel, the process is green and energy-saving, the structure of the catalyst is stable, and the catalyst has a broad application prospect.

The invention provides a production method for synthesizing halogenated aniline by catalytic hydrogenation of halogenated nitrobenzene. The production method uses carbon nanotubes to support Pd, Pt is a hydrogenation catalyst, p-halogenated nitrobenzene such as o-chloronitrobenzene, p-chloronitrobenzene, 3,4-dichloronitrobenzene, 3-chloro-4 The corresponding halogenated anilines were synthesized by liquid-phase catalytic hydrogenation reaction of -fluoronitrobenzene, etc. The production method can effectively suppress hydrodehalogenation, and has the advantages of good selectivity, high yield, high catalyst stability, etc., and the method has great implementation value and social and economic benefits.

The invention provides a preparation method of o-aminothiophenol. The preparation method comprises the following steps: putting o-chloronitrobenzene into sodium methyl mercaptide, and performing heating under the action of a catalyst to carry out a methyl vulcanization reaction so as to prepare o-nitrophenyl dimethyl sulfide; putting o-nitrophenyl thioether into a solvent, and carrying out hydrogenation reduction to prepare o-aminobenzene thioether; and demethylating the o-aminothiophenol under the action of hydrobromic acid to obtain the o-aminothiophenol. The preparation method of o-aminothiophenol has the advantages of high yield and high product purity.

The invention discloses a stainless steel wire gauze platinum-loaded catalyst and application thereof. A preparation method for the stainless steel wire gauze platinum-loaded catalyst comprises the following steps of adding Pt2(dba)3 into propylene carbonate to obtain a mixture, and performing stirring reaction on the mixture under the hydrogen atmosphere of 1-3MPa at room temperature, stopping stirring after 1-2 hours, and taking out a solution to obtain a propylene carbonate solution containing Pt nano particles; immersing a stainless steel wire gauze carrier which is treated by hydrochloric acid and is of 100-300 meshes into the propylene carbonate solution containing the Pt nano particles, taking out the stainless steel wire gauze after the stainless steel wire gauze is treated for 6-24 hours at the temperature of 25-100 DEG C, drying the stainless steel wire gauze to obtain the stainless steel wire gauze platinum-loaded catalyst. The stainless steel wire gauze platinum-loaded catalyst can be applied to reaction of preparation of o-chloroaniline through VOCs catalytic combustion or o-chloronitrobenzene in-situ liquid-phase hydrogenization. The catalyst disclosed by the invention has the advantages of simple preparation technology, readily available raw materials, high catalysis activity and high stability.

The invention discloses a synthesis method of N-methyl-1,2-benzenediamine dihydrochloride. The synthesis method is characterized by comprising the following steps that 1, o-chloronitrobenzene and a monomethylamine aqueous solution are subjected to a sealing reaction, after the reaction is completed, cooling, standing and layering are conducted, and a lower-layer oil phase is collected to obtain N-methyl-2-nitroaniline; 2, a catalyst is added to a mixed solution of ethyl alcohol and the N-methyl-2-nitroaniline obtained in step 1, after mixing and heating, hydrazine hydrate is slowly dropwise added to the mixed solution, and after drop addition is completed, a heat preservation reaction is conducted; after the reaction is completed, suction filtration is conducted, and a suction filtration mother solution is reserved to obtain N-methyl-o-phenylenediamine; 3, liquid caustic soda, water and EDTA are added to the N-methyl-o-phenylenediamine obtained in step 2 for mixing, after cooling is conducted, dichloromethane is added, stirring, extraction, standing and layering are conducted, a lower-layer oil phase is collected, and through separation and purification, the target product N-methyl-1,2-benzenediamine dihydrochloride is obtained. The N-methyl-1,2-benzenediamine dihydrochloride product prepared through the method has high purity and few impurities and can be widely applied to the field of intermediate synthesis of a medicine tishamitan for reducing the blood pressure.