A production equipment and process for catalytic hydrogenation of 4-aminodiphenylamine

Abstract

The invention relates to a device and process for producing 4-aminodiphenylamine by catalytic hydrogenation. The 4-aminodiphenylamine is prepared from materials by catalytic hydrogenation in a continuous production device consisting of a highly efficient tubular reactor and corresponding equipment without participation of a solvent under a fully closed state via reasonable process steps in the presence of a relatively inexpensive and easily available Raney nickel catalyst by selecting a highly efficient gas, liquid, solid catalytic hydrogenation tubular reactor. According to the device and process disclosed by the invention, the consumption of the Raney nickel catalyst is less than 0.1%, the conversion rate can reach 100%, the selectivity is 99.5% or more and the yield is above 99.8%.

Description

technical field [0001] The invention relates to a p-phenylenediamine rubber anti-aging agent intermediate, specifically 4-nitrosodiphenylamine and 4-nitrosodiphenylamine (RT base), which are produced by the direct reaction of aniline with nitrobenzene. A production process in which the complex mixture formed by diphenylamine and the quaternary ammonium base tetramethylammonium hydroxide catalyst, that is, the condensation liquid, is subjected to catalytic hydrogenation under the action of a Raney nickel catalyst. Background technique [0002] The 4-nitrosodiphenylamine and 4-nitrodiphenylamine in the existing domestic and foreign synthetic RT base process steps are reduced to convert nitro and nitroso into amino groups. The industrial method includes low-valent sulfur reduction method , iron powder and other metal reduction methods and catalytic hydrogenation methods. The low-priced sulfur reduction method is the most common method for the early production of RT base in Chi...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of expensive catalysts in the existing catalytic hydrogenation method and further reduce energy consumption and raw material consumption, the present invention provides a relatively cheap and easy-to-obtain Raney nickel catalyst, which is composed of reasonable process steps and does not require solvents to participate in full sealing Under the state of the state, the material is prepared by catalytic hydrogenation through a continuous production device composed of a high-efficiency tubular reactor and corresponding equipment to prepare 4-aminodiphenylamine (RT base) process

Images