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 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.