M-cresol and p-cresol mixture refining method

A refining method and technology for p-cresol are applied in the field of coal chemical industry, and can solve the problems of mixing m-p-cresol and low purity, etc.

Active Publication Date: 2018-02-23
SHAANXI COAL & CHEM IND GRP SHENMU TIANYUAN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved in the present invention is to overcome the defect that isolated 2,6-xylenol and o-ethylphenol have low purity and are mixed with m-p-cresol in the

Method used

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  • M-cresol and p-cresol mixture refining method
  • M-cresol and p-cresol mixture refining method

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Experimental program
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Embodiment 1

[0027] The present embodiment provides a kind of refining method of m-p-cresol, adopts figure 1 The shown device comprises the steps of:

[0028] In this embodiment, T-01 is a light removal tower, T-02 is a weight removal tower, and the specific surface of the filler in the light removal tower and the weight removal tower is 1000.

[0029] (1) After heating the crude m-p-cresol to 105°C, it is passed into the light removal tower T-01 for rectification treatment. The operating pressure of the rectification tower is 1KPa, the temperature is 83°C, and the reflux ratio is 20. The theoretical tower Plate number is 120, obtains tower top distillate and tower bottom distillate;

[0030] The overhead distillate is 2,6-xylenol, and the bottom distillate is a mixed phenol containing o-ethylphenol and m-p-cresol;

[0031] (2) Pass the tower still distillate of light removal tower T-01 into rectification treatment in the weight removal tower T-02, the tower top operating pressure of rec...

Embodiment 2

[0033] The present embodiment provides a kind of refining method of m-p-cresol, comprising the steps:

[0034] (1) After preheating the crude m-p-cresol to 60°C, pass it into the light removal tower for rectification treatment, the operating pressure of the rectification tower top is 0.05KPa, the temperature is 54°C, the reflux ratio is 10, and the theoretical plate Number is 130, obtains overhead distillate and tower bottom distillate;

[0035] The overhead distillate is 2,6-xylenol, and the bottom distillate is a mixed phenol containing o-ethylphenol and m-p-cresol;

[0036] (2) Pass the tower still distillate of the light removal tower into the weight removal tower for rectification treatment. The operating pressure of the rectification tower top is 400KPa, the tower top temperature is 269°C, the reflux ratio is 30, and the number of theoretical plates is It is 130 pieces. The overhead distillate of the weight-removing tower is refined m-p-cresol, and the bottom distillate...

Embodiment 3

[0038] The present embodiment provides a kind of refining method of m-p-cresol, comprising the steps:

[0039] (1) After preheating the crude m-p-cresol to 130°C, pass it into the light removal tower for rectification treatment, the operating pressure of the rectification tower top is 9KPa, the temperature is 135°C, the reflux ratio is 25, and the number of theoretical plates Be 180 pieces, obtain tower top distillate and tower bottom distillate;

[0040] The overhead distillate is 2,6-xylenol, and the bottom distillate is a mixed phenol containing o-ethylphenol and m-p-cresol;

[0041] (2) Pass the tower still distillate of the light removal tower into the weight removal tower for rectification treatment. The operating pressure of the rectification tower top is 100KPa, the tower top temperature is 204°C, the reflux ratio is 12, and the number of theoretical plates is It is 60 pieces. The overhead distillate of the weight-removing tower is refined m-p-cresol, and the bottom d...

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Abstract

The invention provides an m-cresol and p-cresol mixture refining method. The m-cresol and p-cresol mixture refining method comprises the following steps: firstly sending a crude m-cresol and p-cresolmixture into a light component-removing tower, rectifying the crude m-cresol and p-cresol mixture to obtain high-purity 2, 6-dimethylphenol, then sending into a heavy component-removing tower, and rectifying to obtain high-purity o-ethylphenol and a high-purity m-cresol and p-cresol mixture. Through two continuous rectifying treatments to the crude m-cresol and p-cresol mixture, and in coordination with specific temperature, pressure and reflux ratio, refining of the 2, 6-dimethylphenol and the o-ethylphenol can be achieved at one time in an m-cresol and p-cresol mixture refining technology, and the high-purity o-ethylphenol, the high-purity 2, 6-dimethylphenol and the high-purity m-cresol and p-cresol mixture are obtained.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a method for purifying m-p-cresol. Background technique [0002] The boiling points of m-cresol and p-cresol are very close, with a difference of only 0.4°C. It is difficult to separate them in industry, so they usually exist in the form of a mixture of m-cresol and p-cresol. This mixture is m-p-cresol. m-p-cresol is an important industrial raw material, which is widely used in the manufacture of medicine, plastics, pesticides and paints. [0003] At present, m-p-cresol is mainly obtained by rectification of coal tar, but there are also 2,6-xylenol and o-ethylphenol in coal tar. Since the boiling point of 2,6-xylenol and o-ethylphenol is very close to that of m-p-cresol, the difference is only 1-2°C, so the realization of m-p-cresol, o-ethylphenol and 2,6-di The separation of cresol is very difficult. [0004] For this reason, Chinese patent document...

Claims

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Application Information

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IPC IPC(8): C07C37/74C07C39/06C07C39/07
CPCC07C37/007C07C37/685C07C37/74C07C39/06C07C39/07
Inventor 不公告发明人
Owner SHAANXI COAL & CHEM IND GRP SHENMU TIANYUAN CHEM IND
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