Process for preparation of hydrazobenzenes by catalytic...

Details Process for preparation of hydrazobenzenes by catalytic... Process for preparation of hydrazobenzenes by catalytic...

B - Operations, Transporting

01

J

260/591.1

B01J 31/02 (2006.01) B01J 23/38 (2006.01)

Patent

CA 1137512

ABSTRACT OF THE DISCLOSURE: The invention relates that in a process for the hydrogenation of nitrobenzene with hydrogen to hydrazobenzene at temperatures ranging from 40 to 110°C in the presence of a precious metal catalyst, an aqueous solution and an organic solvent, the reaction mixture being maintained in turbulent motion, the improvement wherein said nitrobenzene is o-, m- or p- chloronitrobenzene, the reaction is carried out in the presence of an organic solvent selected in the group constituted by the aliphatic or cycloaliphatic hydrocarbon and the alcoholic aliphatic or cycloaliphatic hydrocarbon, that is not miscible or not misci- ble in any ratio with water, the precious metal catalyst is used in such amount that the weight ratio of chloronitrobenzene used to precious metal catalyst is in the range 1 : 0.00005 to less than 0.0002, the aqueous alkaline solution being one wherein the alkali content thereof is greater than 20 weight percent, and the process is carried out in the presence of a quinone as co- catalyst, said quinone co-catalyst being present such that the weight ratio of mono-chloronitrobenzene to quinone co-catalyst is in the range of 1 : 0.0005 to less than 0.002. This process furnishes the desired hydrazobenzenes in good quality, especially insofar as purity is concerned, and in good yields.

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