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Method and device for separating various phenols from middle-low-temperature coal tar crude phenols

A technology for low-temperature coal tar and crude phenol, applied in the field of coal chemical industry, can solve problems such as inability to separate, and achieve the effect of improving the separation effect

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

[0004] Therefore, the technical problem to be solved in the present invention is to overcome the defect that high-purity 2,6-xylenol and m-p-cresol cannot be separated in the medium and low temperature coal tar crude phenol refining process in the prior art, thereby providing A method and device capable of simultaneously separating and obtaining high-purity phenol, o-cresol, 2,6-dimethylphenol, and m-p-cresol from medium-low temperature coal tar crude phenol

Method used

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  • Method and device for separating various phenols from middle-low-temperature coal tar crude phenols

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The crude phenol refining method of medium and low temperature coal tar crude phenol provided in this example is as follows: the crude phenol raw material obtained from medium and low temperature coal tar includes the following components: 9.71wt% of water, 3.18wt% of pyridine compounds, 17.60wt% of phenol, ortho Cresol 12.39wt%, m-p-cresol 31.86wt%, xylenol 15.91wt%, tricresol 0.30wt%, phenol residue, high boiling point phenol and tar 9.05%. According to the medium and low temperature coal tar crude phenol refining method provided by the present invention, the above-mentioned crude phenol raw material is sent to the dehydration tower 1, the operating pressure at the top of the tower is 30KPa, the operating pressure at the bottom of the tower is 55KPa, the temperature at the top of the tower is 60°C, and the temperature at the bottom of the tower is Under the conditions of 140°C, a reflux ratio of 2, and a plate number of 65, the top of the dehydration tower 1 is separat...

Embodiment 2

[0033]The crude phenol refining method of medium and low temperature coal tar crude phenol provided in this example is as follows: the crude phenol raw material obtained from medium and low temperature coal tar includes the following components: water 12.31wt%, pyridine compounds 2.70wt%, phenol 18.30wt%, ortho Cresol 10.29wt%, m-p-cresol 34.48wt%, xylenol 12.64wt%, tricresol 0.16wt%, phenol residue, high boiling point phenol and tar 9.12%. According to the medium and low temperature coal tar crude phenol refining method provided by the present invention, the above-mentioned crude phenol raw material is sent to the dehydration tower 1, the operating pressure at the top of the tower is 40KPa, the operating pressure at the bottom of the tower is 64kPa, the temperature at the top of the tower is 71 ° C, and the temperature at the bottom of the tower is Under the conditions of 145°C, a reflux ratio of 3, and a plate number of 65, the top of the dehydration tower 1 is separated to o...

Embodiment 3

[0035] The crude phenol refining method of medium and low temperature coal tar crude phenol provided in this example is as follows: the crude phenol raw material obtained from medium and low temperature coal tar includes the following components: 9.71wt% of water, 3.18wt% of pyridine compounds, 17.60wt% of phenol, ortho Cresol 12.39wt%, m-p-cresol 31.86wt%, xylenol 15.91wt%, tricresol 0.30wt%, phenol residue, high boiling point phenol and tar 9.05%. According to the medium and low temperature coal tar crude phenol refining method provided by the present invention, the above-mentioned crude phenol raw material is sent to the dehydration tower 1, the operating pressure at the top of the tower is 30KPa, the operating pressure at the bottom of the tower is 55KPa, the temperature at the top of the tower is 60°C, and the temperature at the bottom of the tower is Under the conditions of 140°C, a reflux ratio of 2, and a plate number of 65, the top of the dehydration tower 1 is separat...

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Abstract

The invention belongs to the technical field of coal chemical industry, and particularly relates to a method and a device for separating various phenols from middle-low-temperature coal tar crude phenols. The method includes a pretreatment step and a mixed phenol separation step, the pretreatment step includes performing dehydration, light component removal, heavy component removal and pyridine compound removal treatment on the middle-low-temperature coal tar crude phenols to obtain pretreated mixed phenols, and the mixed phenol separation step includes separating phenols, orthocresol, 2, 6-dimethylphenol and cresol in the pretreated mixed phenols. The device comprises a pretreatment system and a continuous rectification system, the pretreatment system comprises a dehydrating tower, a light component removal tower, a heavy component removal tower and a pyridine extraction device which are sequentially connected, and the continuous rectification system comprises a phenol refining tower,a orthocresol refining tower, 2, 6-dimethylphenol refining tower, a cresol tower and a cresol refining tower which are sequentially connected. According to the method and the device, the middle-low-temperature coal tar crude phenols are separated to obtain the phenol, the orthocresol, the 2, 6-dimethylphenol and the cresol.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a method and a device for separating various phenols from medium-low temperature coal tar crude phenols. Background technique [0002] Phenolic compounds are important chemical raw materials and are widely used in synthetic fibers, engineering plastics, pesticides, medicines, explosives, plasticizers, preservatives and dye intermediates. Crude phenols are mostly extracted from coal tar. Coal tar is a black or dark brown viscous liquid produced in the process of coal carbonization. Depending on the temperature and method of carbonization, low-temperature coal tar, medium-low temperature coal tar, and high-temperature coal tar can be obtained. . The composition of coal tar is extremely complex, with tens of thousands of compounds, among which the liquid of high-temperature pyrolysis (coking) of coal generally accounts for about 1-3%, the content of pheno...

Claims

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Application Information

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IPC IPC(8): C07C37/68C07C37/74C07C39/04C07C39/06C07C39/07
CPCC07C37/007C07C37/685C07C37/74C07C39/04C07C39/06C07C39/07
Inventor 不公告发明人
Owner SHAANXI COAL & CHEM IND GRP SHENMU TIANYUAN CHEM IND
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