Catalyst for producing diethyltoluene diamine and preparation method and application of catalyst

Abstract

The invention discloses a supported catalyst for producing diethyltoluene diamine. The supported catalyst for producing diethyltoluene diamine comprises a modified carrier and a supported active component, wherein the modified carrier contains SiO2 and B2O3 obtained by decomposing a soluble silicon-containing compound and a boron-containing compound through drying and roasting after introducing the soluble silicon-containing compound and the boron-containing compound into the carrier. The invention further discloses a preparation method and application of the catalyst. The catalyst disclosed by the invention is suitable for the alkylation of aromatic amines, especially has extremely high activity and selectivity for continuous production of diethyltoluene diamine with toluenediamine alkylation. The catalyst has a simple preparation process, high economy and better application prospects.

Description

technical field [0001] The invention relates to the field of preparation of diethyltoluenediamine, in particular to a supported catalyst for producing diethyltoluenediamine and its preparation method and application. Background technique [0002] Diethyltoluenediamine (abbreviated as DETDA) is a low-viscosity, non-toxic, odorless light yellow liquid, which is 3,5-diethyl-2,4-toluenediamine (about 80%) and 3, 5-diethyl-2,6-toluenediamine (about 20%) is a mixture of two isomers, the structural formula is as follows: [0003] [0004] DETDA is a sterically hindered aromatic diamine. The steric hindrance of ethyl and methyl groups makes its activity much lower than that of toluene diamine (TDA). It reacts with polyurethane prepolymers faster than DMTDA and twice as fast as MOCA is about 30 times faster. DETDA is a chain extender for polyurethane and polyurea elastomers. It can also be used as a curing agent for polyurethane and epoxy resins. It has the advantages of fast re...

AI Technical Summary

Problems solved by technology

[0016] 1) complex reaction, many by-products, and poor product selectivity;

[0017] 2) Post-processing needs to go through steps such as alkali neutralization, filtration, extraction, rectification, etc., and there are problems such as cumbersome post-processing process, large amount of three wastes, difficult solid waste disposal, and environmental pollution;

[0018] 3) The product needs to pass rectification to be qualified, but because the boiling points of the by-product and the main product are very close, there are problems such as difficulty in product separation

The disadvantage of this invention is that the reaction conditions are harsh, especially for the alkylation reaction of ethylene needs higher temperature and pressure (temperature up to 375 ℃, pressure up to 3000psig)

At the same time, the conversion rate of raw materials is low, and the alkylation products are mainly monosubstituted ortho-cycloalkylation products, and a large amount of N-alkylated by-products are produced during the reaction.

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