Separation method of m-ethylphenol and paraethyl phenol

Abstract

The invention provides a separation method of m-ethylphenol and paraethyl phenol, and particularly relates to a method using the steps that composite ion liquid is used as a catalyst and a solvent; under a certain condition, m-ethylphenol and paraethyl phenol are subjected to tert-butylation and rectification so that the two isomers are separated; then, tertiary butyl removal is performed to obtain m-ethylphenol products and paraethyl phenol products.

Description

technical field [0001] The present invention relates to a kind of separation method of m-ethylphenol and p-ethylphenol, more specifically, relate to a kind of utilizing m-ethylphenol and p-ethylphenol first tert-butylation and then rectification to make two isomers Separate, and then obtain m-ethylphenol product and p-ethylphenol product by taking off tert-butyl. technical background [0002] p-Ethylphenol is an important pesticide intermediate, which can produce a series of high-grade, low-toxicity, and low-residue pesticides. In addition, it is also a raw material for the production of synthetic resins, medicines, and plasticizers. At present, in the production method of p-ethylphenol, there are generally two products of m-ethylphenol and p-ethylphenol at the same time, and because the difference in boiling point of these two isomers is very small, it is difficult to separate the two isomers by ordinary rectification. or completely separated, so other methods of separatio...

AI Technical Summary

Problems solved by technology

[0003] Although there are many separation methods for m-p-alkylphenols at present, and some methods have been industrialized, there are still certain shortcomings

For example: the crystallization separation method has strict requirements on the proportion of raw materials, and the yield is not high; the adsorption separation method needs to use a large amount of solvent, and has high requirements for the separation operation; the complexation separation method also requires a large amount of solvent, and complexation The separation and mechanical application of solvents are complicated and costly; the alkylation separation method is a relatively common method for separating m-p-cresol in China at present, but when liquid acid, acidic ionic liquid and aluminum phenate are used as catalysts, the separation of catalysts is difficult. It must be difficult. When solid acid is used as the catalyst, ethylene isobutyl is easy to polymerize on the catalyst, which will cause accelerated deactivation of the catalyst and affect the service life.