Triethylene diamine synthesis method

Abstract

The invention discloses a triethylene diamine synthesis method, which comprises the following steps of performing preheating gasification on a water solution of raw materials; then, at 180 to 400 DEG C, performing contact reaction with modified molecular sieve catalysts to obtain triethylene diamine, wherein the modified molecular sieve catalysts are obtained by soaking HZSM type molecular sieves into a water solution of alkaline earth metal compounds and then performing drying and roasting; the raw materials are at least one kind of materials from piperazidine, piperazidine derivatives, straight chain alcohol amine and amines. The molecular sieve catalysts are modified through the alkaline earth metal, so that the acidity and the acid size of Brphinsted acid on the surfaces of the molecular sieve catalysts are obviously reduced; the proportion of the Lewis acid sites is improved; the reaction temperature is greatly lowered; the universality of the catalysts is good; the product yield is improved. Compared with a conventional triethylene diamine synthesis method, the triethylene diamine synthesis method achieves economic effects, green effects and high efficiency.

Description

technical field [0001] The invention relates to the technical field of chemical synthesis, in particular to a synthesis method of triethylenediamine. Background technique [0002] In recent years, with the increasingly wide range of applications, the polyurethane foam industry has developed rapidly. As its hardener, the market demand for triethylenediamine (TEDA) hits new highs; not only that, triethylenediamine (TEDA) can also be used as an ethylene polymerization catalyst and an ethylene oxide polymerization catalyst; its derivatives can also be used For emulsifiers and corrosion inhibitors. Therefore, the synthesis of triethylenediamine has been widely concerned by scientists. [0003] The US patent US6350874 reports the technology of using chain or cyclic amines as raw materials and using zeolite molecular sieves as catalysts to co-produce triethylenediamine and piperazine. However, the process reaction conditions are severe and the yield of triethylenediamine is not ...

AI Technical Summary

Problems solved by technology

[0007] The reaction of synthesizing triethylenediamine usually needs to be completed under the catalysis of an acidic catalyst, but if the catalyst is too acidic, many side reactions may occur and a large amount of carbon deposits will be generated

On the one hand, the occurrence of side reactions will seriously affect the yield of triethylenediamine, on the other hand, carbon deposition will poison the catalyst and affect its catalytic activity and service life

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