Catalyst for catalytic hydrogenolysis of unsym-dimethylhydrazine and its prepn

Abstract

THe catalyst for catalytic hydrogenolysis of unsym-dimethylhydrazine (UDMH) is one kind of improved loaded rhodium catalyst. The improved catalyst has added assistant, which is VIII element and alkali metal oxide. With the said improved catalyst and in the reaction conditions including temperature 100-300 deg.C, normal pressure, molar ratio between H2 and UDMH 1-10 and UDMH liquid space velocity 0.5-8 ml / ml catalyst, Hr, UDMH is converted to produce dimethylamine and ammonia. The said catalyst has simple preparation process, high reaction conversion rate and makes it possible to minimize the reaction apparatus.

Description

technical field [0001] The invention provides a catalyst and method for producing ammonia and dimethylamine by catalytic hydrogenolysis of unsymmetrical dimethylhydrazine. Background technique [0002] 1,1-Dimethylhydrazine, also known as unsymmetrical dimethylhydrazine, is a colorless liquid with a pungent odor. In the air, unsymmetrical dimethylhydrazine is easily oxidized slowly and turns yellow. At present, unsymmetrical dimethylhydrazine is mainly produced by the chloramine method, using sodium hypochlorite, ammonia water and dimethylamine as raw materials. [0003] <chemistry num="001"> <chem file="01131291_cml001.xml" / > < / chemistry> [0004] The main use of unsymmetrical dimethylhydrazine is as a rocket propellant. Long-term storage of unsymmetrical dimethylhydrazine will be slowly oxidized by air to form a part of hydrazone. [0005] <chemistry num="002"> <chem file="01131291_cml002.xml" / > < / chemistry> Such oxidized UDM...

AI Technical Summary

Problems solved by technology

Its handling is a very difficult problem

Due to the high nitrogen content of unsymmetrical dimethylhydrazine, a large amount of NO will be produced when burned as fuel x , causing severe air pollution

And because unsymmetrical dimethylhydrazine is flammable, explosive, and poisonous, it is also difficult to transport it to the production plant for long-distance treatment.

But have not yet retrieved the catalyst and preparation method thereof that can effectively hydrogenolyze unsymmetrical dimethylhydrazine

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