Separation method of m-cresol and p-cresol mixture

A separation method and technology of mixing cresols, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., to achieve high reaction conversion rate, low raw material consumption and production cost, and reliable safety performance
CN101863742BInactive Publication Date: 2013-11-06吴鸿宾
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
吴鸿宾
Publication Date
2013-11-06
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

Abstract

The invention discloses a novel method for separating an m-cresol and p-cresol mixture to obtain high-purity m-cresol and p-cresol. The method comprises the following steps: carrying out alkylation reaction on the m-cresol and the p-cresol as raw materials under the existence of an alkylating agent and a catalyst to obtain the mixed solution of 2-tertiary butyl-p-cresol and 6-tertiary butyl-m-cresol; rectifying the mixed solution to obtain the products of high-purity 2-tertiary butyl-p-cresol and 6-tertiary butyl-m-cresol; respectively carrying out dealkylation reaction and rectification on the obtained high-purity 2-tertiary butyl-p-cresol and 6-tertiary butyl-m-cresol under the existence of the catalyst to respectively obtain the products of the high-purity m-cresol and p-cresol; and recovering isobutene generated by dealkylation. The invention has high reaction conversion rate, high atom use ratio, low raw material consumption and production cost and reliable safety performance.
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Description

technical field

[0001] The invention relates to a method for separating m-p-mixed cresols, in particular to a method for separating m-cresol and p-cresol mixtures to obtain high-purity m-cresol and p-cresol. Background technique

[0002] m-cresol and p-cresol are important organic synthesis intermediates. The traditional production method of high-purity m-cresol is the diazotization hydrolysis method, and the traditional production method of p-cresol is the sulfonation alkali solution method. Both methods have low atom utilization and are highly polluting process routes, which do not conform to modern green chemistry. idea. Coal chemical by-product mixed cresol, because the boiling point of m-cresol is 203°C, the boiling point of p-cresol is 202.8°C, and the other physical and chemical properties of the two are also very close, so m-p-cresol in the by-product of coal chemical industry cannot be effectively separated, affecting effective use of both.

[0003] U.S. Patent N...

Claims

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