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Method and device for continuously rectifying and separating medium/low-temperature coal tar crude phenols

A low-temperature coal tar and rectification separation technology, which is applied in the field of coal chemical industry, can solve the problems of many operation links, affected product output and quality, and high labor intensity of workers, so as to achieve a high degree of automation, reduce operators and labor intensity, The effect of good economic and social benefits

Active Publication Date: 2012-10-17
SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a continuous rectification separation of medium and low temperature in view of defects such as many operating links, high labor intensity of workers, and affected product yield and quality in the existing medium and low temperature coal tar crude phenol separation production. The method of coal tar crude phenol, which is based on the six-tower continuous vacuum distillation separation process, can effectively separate and refine medium and low temperature coal tar crude phenol through continuous distillation, and can obtain more than 99.5% of phenol and o-cresol Products, mixed phenol products with a content of more than 98% of 2,6-dimethylphenol, 4-methylphenol, 3-methylphenol and 2-ethylphenol, 2,4-dimethylphenol with a content of more than 96% Mixed phenol products of methylphenol, 2,5-dimethylphenol, 4-methyl-2-ethylphenol and 6-methyl-2-ethylphenol and other mixed phenol products; another aspect of the present invention The purpose is to provide a device for continuous rectification and separation of crude phenol from medium and low temperature coal tar according to the above method

Method used

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  • Method and device for continuously rectifying and separating medium/low-temperature coal tar crude phenols

Examples

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Embodiment 1

[0064] The crude phenol obtained from the treatment of medium and low temperature coal tar in a semi-coke enterprise is used as the raw material solution (the components are roughly 5.2% phenol, 6.7% o-cresol, 12.3% m-cresol, 6.3% p-cresol, 22.1% xylenol, B base phenol 13.5%, tricresyl 7.3%, heavy phenol 22.0%), the crude phenol raw material enters the rectification column after pretreatment, and separates and obtains each target component successively. The raw material crude phenol is transported to the light component tower T-01 by the feed pump P-101, and the mixed phenol of phenol and o-cresol is extracted from the top of the tower, and the steam at the top of the tower enters the condenser E-101 of T-01, and the uncondensed steam Enter the trap E-103 to condense, and the operating conditions of the light component tower T-01 are: the top pressure of the tower is 5KPa, the reflux ratio is 8, and the temperature is 104.5°C; the bottom pressure of the tower is 15KPa, and the ...

Embodiment 2

[0066] The crude phenol obtained from the treatment of medium and low temperature coal tar in a semi-coke enterprise is used as the raw material solution (the components are roughly 7.1% phenol, 6.3% o-cresol, 10.8% m-cresol, 5.9% p-cresol, 23.2% xylenol, B base phenol 11.9%, tricresyl 9.2%, heavy phenol 20.6%), the crude phenol raw material enters the rectification column after pretreatment, and separates and obtains each target component successively. The raw material is transported to the light removal component T-01 by the feed pump, and the mixed phenol of phenol and o-cresol is extracted from the top of the tower, and the steam at the top of the tower enters the condenser of T-01, and the uncondensed steam enters the trap to condense, and the light removal group The operating conditions of sub-column T-01 are: the pressure at the top of the tower is 10KPa, the reflux ratio is 7.5, and the temperature is 125.9°C; the pressure at the bottom of the tower is 20KPa, and the te...

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Abstract

The invention discloses a method and device for continuously rectifying and separating medium / low-temperature coal tar crude phenols. The method is implemented in a way that: crude phenols extracted from medium / low-temperature coal tar as raw materials are subjected to six-tower continuous rectification to effectively perform impurity removal and separation, thereby obtaining a mixed phenol product containing phenol and orthocresol of which the purities are higher than 99.5% and 2,6-dimethylphenol, 4-methylphenol, 3-methylphenol and 2-methylphenol of which the contents are higher than 99%, a mixed phenol product containing 2,4-dimethylphenol, 2,5-dimethylphenol, 4-methyl-2-ethylphenol and 6-methyl-2-ethylphenol of which the contents are higher than 96%, and the like. The device comprises a light component removal unit, a phenol-orthocresol unit, a meta-paracresol unit, a dimethyl phenol unit a trimethyl phenol unit, a decolorization unit and a vacuum system which are connected through pipelines. In view of the composition characteristics of medium / low-temperature coal tar crude phenols, the invention obtains optimized technique and parameters for separating phenol products; and the whole technical process is reasonable and continuous, has the characteristics of low energy consumption, high product quality, high stability, low production cost and the like, and thus, is an efficient and feasible continuous technique for continuously rectifying and separating medium / low-temperature coal tar crude phenols.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and relates to a method and device for physical and chemical separation of coal tar, in particular to a method and device for continuous rectification and separation of medium and low temperature coal tar crude phenol. Background technique [0002] Medium and low temperature coal tar is rich in phenolic resources. These phenolic substances are important chemical raw materials and have great potential in synthetic fibers, engineering plastics, pesticides, medicines, explosives, plasticizers, preservatives, spices and dye intermediates. It has a wide range of uses and belongs to high value-added fine chemical products, and the synthesis of such substances requires high environmental or economic costs. Therefore, it is of great significance to separate and refine high-purity phenolic products from medium and low temperature coal tar. [0003] In the past, medium and low temperature c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C39/04C07C39/07C07C39/06C07C37/74
Inventor 张存社张金峰沈寒晰周魁蓝伟成西涛
Owner SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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