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Method and device for separating mixed substances in reaction solution for oxidation of phenol with hydrogen peroxide

A technology of liquid mixture and oxidation of phenol, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., and can solve problems such as low yield, low production efficiency, and high cost

Inactive Publication Date: 2010-09-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing process has low production efficiency, long process, low yield, high cost and other problems

Method used

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  • Method and device for separating mixed substances in reaction solution for oxidation of phenol with hydrogen peroxide
  • Method and device for separating mixed substances in reaction solution for oxidation of phenol with hydrogen peroxide
  • Method and device for separating mixed substances in reaction solution for oxidation of phenol with hydrogen peroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The raw material liquid (the quality of the raw material liquid consists of 20% water, 68% phenol, 3% catechol, 5% hydroquinone and 4% tar) is passed into the dehydration rectification tower with a flow rate of 6000kg / h, and then Carry out rectification by the first dephenol rectification tower, the second dephenol rectification tower and decoking rectification tower successively, the operation pressure in the tower of the first described first dephenol rectification tower is normal pressure and its tower top and The pressure difference at the bottom of the tower is 2kPa; the components distilled from the top of the decoking distillation tower are sent to the pyrocatechol rectification tower with a flow rate of 500kg / h, and are separated from the pyrocatechol rectification tower by rectification. The high-purity pyrocatechol product is distilled out from the top of the distillation tower, and the operating pressure in the said pyrocatechol rectifying tower is 5kPa; top)...

Embodiment 2

[0026] The raw material liquid (the quality of said raw material liquid consists of 50% water, 30% phenol, 9% catechol, 9% hydroquinone and 2% tar) is passed into the dehydration rectification tower with a flow rate of 3000kg / h, and then Carry out rectification by the first dephenol rectification tower, the second dephenol rectification tower and decoking rectification tower successively, the operation pressure in the tower of the first described first dephenol rectification tower is normal pressure and its tower top and The pressure difference at the bottom of the tower is 3kPa; the components distilled from the top of the decoking distillation tower are sent to the pyrocatechol rectification tower with a flow rate of 550kg / h, and are separated from the pyrocatechol rectification tower after rectification separation. High-purity catechol products are distilled from the top of the distillation tower. The operating pressure in the catechol rectification tower is 8kPa; the pressu...

Embodiment 3

[0028] The raw material liquid (the quality of the raw material liquid consists of 70% water, 20% phenol, 6% catechol, 3% hydroquinone and 1% tar) is passed into the dehydration rectification tower with a flow rate of 4500kg / h, and then Carry out rectification by the first dephenol rectification tower, the second dephenol rectification tower and decoking rectification tower successively, the operation pressure in the tower of the first described first dephenol rectification tower is normal pressure and its tower top and The pressure difference at the bottom of the tower is 2.5kPa; The components after the overhead distillation of the decoking distillation tower are sent to the catechol rectification tower with a flow rate of 410kg / h, and the catechol rectification tower is separated from the catechol after rectification separation. The high-purity catechol product is distilled from the top of the rectification tower. The operating pressure in the catechol rectification tower is...

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Abstract

The invention discloses a method and a device for method and device for separating mixed substances in reaction solution for oxidation of phenol with hydrogen peroxide. The method comprises the following steps: (a) rectifying raw material solution by allowing the raw material solution to pass through a dehydration rectifying tower, a first dephenolizing rectifying tower, a second dephenolizing rectifying tower and a decoking rectifying tower; (b) delivering the overhead distillate of the decoking rectifying tower to a pyrocatechol rectifying tower, and obtaining a pyrocatechol overhead distillate after rectification; and (c), delivering coarse hydroquinone which is drawn from the bottom of the pyrocatechol rectifying tower and contains a small amount of pyrocatechol and tar to a hydroquinone rectifying tower, drawing a hydroquinone product from the side of the upper segment of the hydroquinone rectifying tower after rectification and separation, returning the hydroquinone and tar mixture drawn from the bottom of the tower to the feed inlet of the decoking rectifying tower, and returning the overhead distillate, which contains a large amount of hydroquinone and a small amount of pyrocatechol, of the decoking rectifying tower to the feed inlet of the pyrocatechol rectifying tower. The method avoids the problems such as long process flow, low yield and high cost of the conventional process.

Description

technical field [0001] The invention relates to a method for separating and purifying a phenol reaction liquid mixture oxidized by hydrogen peroxide, and also relates to a separation and purification device for a phenol reaction liquid mixture oxidized by hydrogen peroxide. Background technique [0002] my country began to develop and research new production processes of dihydric phenols in the 1960s and 1970s. The reaction and separation processes have become increasingly mature, and industrial production has been formed. [0003] Chinese patent ZL200610072928.6 is about the separation and purification technology of phenol and o-hydroquinone aqueous solution, and it has been industrialized at present. The separation process of patent ZL200610072928.6 is as follows figure 1 . It comprises the following steps (a) feeding the raw material liquid into the dehydration distillation tower, and the phenol-containing waste water is discharged from the top of the tower, and the raw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C39/08C07C37/70
Inventor 冯惠生王强杨腾李昌青
Owner TIANJIN UNIV
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