Process and system for the preparation of ethylene glycol mono-tert-butyl ether

By using a liquid acid catalyst and reactive distillation process in a plug flow reactor, the problems of numerous byproducts and low selectivity in the synthesis of ethylene glycol mono-tert-butyl ether in the prior art have been solved, and high-purity ethylene glycol mono-tert-butyl ether production with high efficiency and low energy consumption has been achieved.

CN122127209APending Publication Date: 2026-06-02HUIZHOU BOEKO MATERIALS CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUIZHOU BOEKO MATERIALS CO LTD
Filing Date
2026-02-24
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing methods for synthesizing ethylene glycol mono-tert-butyl ether suffer from problems such as numerous byproducts, low selectivity, complex processes, high equipment investment, and high energy consumption, making it difficult to efficiently produce high-purity ethylene glycol mono-tert-butyl ether.

Method used

Etherification was carried out using a plug flow reactor and a liquid acid catalyst. Combined with reactive distillation, ethylene glycol mono-tert-butyl ether and ethylene glycol di-tert-butyl ether were obtained through azeotropic separation and purification. The ethylene glycol di-tert-butyl ether was then returned to the reactor as an inhibitor to adjust the reaction conditions and improve selectivity.

Benefits of technology

High-efficiency production is achieved under low temperature and low pressure, reducing equipment investment and energy consumption, improving production efficiency, and achieving a selectivity and purity of over 99% for ethylene glycol monotert-butyl ether, while reducing the generation of by-products.

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Abstract

This invention provides a method and system for preparing ethylene glycol mono-tert-butyl ether, relating to the field of chemical synthesis technology. The method for preparing ethylene glycol mono-tert-butyl ether includes: in a plug flow reactor, ethylene glycol and isobutylene undergo an etherification reaction in the presence of a liquid acid catalyst to obtain a mixture one; the mixture one is subjected to azeotropic separation to obtain a mixture two containing ethylene glycol mono-tert-butyl ether and ethylene glycol di-tert-butyl ether; the mixture two is purified and separated to obtain ethylene glycol mono-tert-butyl ether and ethylene glycol di-tert-butyl ether respectively; the separated ethylene glycol di-tert-butyl ether is returned to the plug flow reactor so that the subsequent etherification reaction can be carried out in the presence of ethylene glycol di-tert-butyl ether. This invention utilizes a plug flow reactor reaction and reactive distillation technology, and employs a liquid acid catalyst to provide a high concentration of protons, reducing the activation energy of the reaction, thereby efficiently activating the reactant molecules and achieving the goal of efficiently producing ethylene glycol mono-tert-butyl ether.
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