Direct isobutene aminating process to prepare tert-butyl amine

Abstract

In the direct isobutene aminating process, isobutylene and ammonia are directly reacted to prepare tert-butyl amine in the presence of catalyst the reaction temperature of 150-280 deg.c, normal temperature or reaction pressure of 0.05-0.5 MPa, isobutylene and ammonia feeding molar ratio of 0.5-2 and isobutylene space velocity of 260-409 / hr(-1). The catalyst has aluminosilicate molecular sieve as mother body with Si / Al ratio of 30-300, specific surface area of 100-800 sq m / g and pore volume of 0.1-0.4 mg / g, and the molecular sieve is first denatured into H-molecular sieve and then denatured with one or more denaturing elements Ce, La and Ga in the weight content of 1-10 wt%. The present invention adopts catalyst with relatively low cost, and the direct aminating is in relatively low temperature or the favorable thermodynamic temperature range.

Description

technical field [0001] The invention belongs to a method for preparing amines by amination of olefins. The catalyst used uses silicon-aluminum molecular sieves as a matrix and is modified by exchange of rare earth elements. Background technique [0002] Tert-butylamine is a widely used organic chemical raw material, which can be used in the manufacture of medicines, pesticides, rubber accelerators, dyes and colorants, etc. The industrial synthesis routes of tert-butylamine mainly include tert-butylurea hydrolysis method, N-tert-butylamide hydrolysis method, tert-butanol direct amination method and isobutene direct amination method, among which the isobutene direct amination method is the most economical and efficient. [0003] In the prior art, the early direct amination method of isobutene to prepare tert-butylamine requires a reaction pressure as high as nearly 30 MPa, which has high requirements on equipment and consumes a lot of power. Along with the continuous improvem...

AI Technical Summary

Problems solved by technology

However, its disadvantage is that the catalyst uses noble metals as raw materials, and the manufacturing cost of the catalyst itself is relatively high