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A kind of method of producing m-cresol

A technology for the production of m-cresol, which is applied in chemical instruments and methods, the preparation of organic compounds, organic chemistry, etc., can solve the problems of high cost, cumbersome operation, and inability to obtain m-cresol, and achieve the effect of increasing the yield

Active Publication Date: 2015-12-23
BEIJING RISUN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mixture of m-cresol and p-cresol is first obtained from the synthesis of toluene, and then pure m-cresol and pure p-cresol are obtained respectively through operations such as tert-butylation, rectification, and dealkylation, because alkylation must And the operation of dealkylation has the disadvantages of cumbersome operation and high cost
[0004] In addition, m-cresol can be extracted from coal tar. First, phenol, o-cresol, m-cresol, p-cresol, 6 xylenol isomers and other mixtures of higher phenols are obtained, and then phenol, o-cresol, and o-cresol are obtained by rectification. Cresol, a mixture of m-cresol and p-cresol, and a mixture of xylenol cannot obtain pure m-cresol, although m-cresol and p-cresol mixtures can be separated by complex crystallization (complexing agent is generally urea) Part of the m-cresol, but the remaining large amount of low-value m-cresol content of less than 50% m-p-cresol mixture cannot be processed, resulting in high costs

Method used

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  • A kind of method of producing m-cresol

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Embodiment 1

[0049] Using industrial cresol as raw material, wherein the weight percentages of o-, m-, p-cresol and xylenol are respectively 24%, 42%, 28%, 6%, the isomerization reactor is a fixed-bed reactor, and the catalyst is Hydrogen type ZSM-5, the ratio of silicon to aluminum is 38, and the reaction space velocity is 0.4h -1 , the reaction temperature is 400°C, and the reaction pressure is 0.2Mpa. The reaction product is separated by rectification to obtain a mixture of xylenol product, o-cresol and m-p-cresol, and the separated o-cresol is returned to the fixed-bed reactor to carry out the isomerization reaction again.

[0050] Using urea as complexing agent, the molar ratio of its added amount to the m-cresol in the m-p-cresol mixture is 0.6:1, the complexation reaction temperature is 60°C, and the time is 2h. After the reaction is completed, slowly add petroleum ether with a boiling range of 60-90°C from the solvent tank 1, and the mass ratio of the amount of petroleum ether to ...

Embodiment 2

[0054] The experimental device and operation are the same as in Example 1, except that the isomerization catalyst is hydrogen type ZSM-5, and the silicon-aluminum ratio is 120. The experimental results are shown in Table 1.

Embodiment 3

[0056] The experimental device and operation are the same as in Example 1, except that the isomerization catalyst is mordenite. The experimental results are shown in Table 1.

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Abstract

The invention relates to a method for converting o-cresol or p-cresol into m-cresol with high productivity. The method at least comprises the following steps: during a technology of extracting m-cresol from m-cresol and p-cresol mixture complexation, after a complexing crystallizing method is adopted to isolate partial m-cresol, the residual m-cresol and p-cresol mixture with m-cresol content less than 50% is regarded as raw material solution, and isomerization is carried out to raw material solution again.

Description

technical field [0001] The present invention relates to a method for producing m-cresol with a high yield, in particular, relates to a method for converting o-cresol or p-cresol into m-cresol with a high yield, the method at least includes the following steps: 1. In the process of extracting m-cresol by complexation of p-cresol mixture, the remaining m-cresol mixture with a m-cresol content lower than 50% after separating part of m-cresol by complex crystallization method is used as a raw material solution to carry out iso-cresol again. structured. Background technique [0002] m-cresol is an important chemical product, which can be widely used as an intermediate in the synthesis of vitamin E, pyrethroid pesticides, spices, and antioxidants. [0003] At present, m-cresol is mainly synthesized from toluene and extracted from coal tar. The mixture of m-cresol and p-cresol is first obtained from the synthesis of toluene, and then pure m-cresol and pure p-cresol are obtained r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C39/07C07C37/00
Inventor 张英伟印文雅彭永兴薛全民张敏生魏小林张令霞宿亮虎孙长江
Owner BEIJING RISUN TECH CO LTD