Method for preparing diol mono-tert-butyl ether

Abstract

The present invention relates to a method for preparing diol mono-tert-butyl ether. According to the method, isobutene gas and liquid-phase diol are introduced into the catalyst bed layer in the middle portion of a reactor, the generated diol mono-tert-butyl ether is instantly distilled from the bed layer under the gas stripping effect of the isobutene gas so as to avoid the generation of ethylene glycol di-tert-butyl ether due to the continuous reaction between the diol mono-tert-butyl ether and the isobutene, the diol mono-tert-butyl ether is separated on the upper portion of the reactor, the separated diol mono-tert-butyl ether is condensed on the tower top, the condensed diol mono-tert-butyl ether is extracted from the tower top or the side line, and the unreacted isobutylene and the unreacted diol are respectively extracted from the tower top and the tower bottom and then are recycled to the inlet. With the process of the present invention, the generation of the diol di-tert-butyl ether can be inhibited, such that the problems that the azeotropy of the diol di-tert-butyl ether and the diol mono-tert-butyl ether causes high separation energy consumption, high investment, and the like can be avoided.

Description

technical field

[0001] The invention relates to a method for preparing diol mono-tert-butyl ether. Background technique

[0002] Glycol tert-butyl ether is an isomer of glycol n-butyl ether. Because of its tert-butyl structure, it has lower photochemical properties, lower toxicity and More excellent hydrophilicity, it is an important chemical product in glycol ethers, it can be used as an excellent solvent for coatings, inks, etc., and it can also be used in detergents. The common ethylene glycol n-butyl ether is usually synthesized by the ring-opening reaction of butanol and ethylene oxide, but ethylene glycol tert-butyl ether cannot be prepared by the reaction of tert-butanol and ethylene oxide, because tert-butanol It is difficult to react with ethylene oxide, and the selectivity of ethylene glycol monoether is particularly low, mainly producing higher molecular weight ethylene oxide oligomers. Therefore, ethylene glycol tert-butyl ether uses a technique similar to the ...

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