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A kind of separation method of hydroquinone reaction liquid

A separation method and reaction solution technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of increased metamorphic loss, large total loss, difficulty in balancing metamorphic loss and take-away loss, etc., to achieve Effects of reduced deterioration loss and low carry-over loss

Active Publication Date: 2021-03-26
JIAXING ZHONGHUA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce the carry-over loss, the detarring temperature should be high, but the metamorphic loss increases significantly at high temperature, and the total loss may be even greater. It is difficult to have both metamorphic loss and carry-over loss, which is an important problem that needs to be solved urgently in the separation of reaction liquids

Method used

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  • A kind of separation method of hydroquinone reaction liquid
  • A kind of separation method of hydroquinone reaction liquid
  • A kind of separation method of hydroquinone reaction liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] 180.1 g of the reaction solution of hydrogen peroxide hydroxylation of dehydrated phenol was continuously vaporized in a 100 ml vaporization kettle with a vaporization pressure of 15 mmHg and a vaporization temperature of 180° C. As a result of vaporization, 166.8 g of vapor phase condensate, 8.3 g of vaporized residual liquid, and 4.6 g of cold neck collected liquid were obtained.

[0058] The composition of each stock material and the material balance of each component are shown in Table 1, and Table 1 is the composition of each stock material obtained by vaporization and the material balance of each component. Among them, the loss rate of phenol during the vaporization process was 0.39%, that of catechol was 2.6%, and that of hydroquinone was 3.4%.

[0059] The 8.3g vaporization raffinate obtained by vaporization was continuously stripped with 120g phenol in a 100ml stripping kettle, the stripping pressure was 15mmHg, and the stripping temperature was 180°C. As a re...

Embodiment 2

[0068] 180.1 g of the reaction solution of hydrogen peroxide hydroxylation of dehydrated phenol was continuously vaporized in a 100 ml vaporization kettle with a vaporization pressure of 15 mmHg and a vaporization temperature of 180° C. As a result of vaporization, 167.9 g of vapor phase condensate, 8.2 g of vaporized residual liquid, and 3.7 g of cold neck collected liquid were obtained.

[0069] The composition of each stock material and the material balance of each component are shown in Table 3, and Table 3 is the composition of each stock material obtained by vaporization and the material balance of each component. As can be seen from Table 3, the loss rate of phenol in the vaporization process is 0.39%, the loss rate of catechol is 2.5%, and the loss rate of hydroquinone is 3.4%.

[0070] The 8.2g vaporization raffinate obtained by vaporization was continuously stripped with 60.5g phenol in a 100ml stripping kettle, the stripping pressure was 15mmHg, and the stripping te...

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Abstract

The invention provides a separation method of benzenediol reaction liquid, which comprises the following steps: vaporizing the benzenediol reaction liquid to form first vapor phase condensate, vaporization residual liquid and first cold neck collecting liquid, performing vapor stripping on the vaporization residual liquid with vaporous phenol to form second vapor phase condensate, vapor strippingresidual liquid and second cold neck collecting liquid, and performing rectification on the first vapor phase condensate and the second vapor phase condensate to separate phenol, pyrocatechol and hydroquinone. According to the method, the reaction liquid is vaporized; tar and a catalyst are separated from phenol and benzenediol; the temperature is lower; a deterioration loss of a material is reduced; phenol is used for the vapor stripping; residual benzenediol in the tar is extracted; a content of benzenediol in the discharged tar is greatly reduced; and a lower carry-off loss is achieved under the condition of the lower deterioration loss. The purpose of separating phenol, pyrocatechol and hydroquinone can be achieved by the rectification.

Description

technical field [0001] The invention relates to the technical field of diphenol preparation, in particular to a method for separating a diphenol reaction liquid. Background technique [0002] Hydroquinone, including catechol and hydroquinone, is an important chemical raw material with a wide range of applications. Among them, catechol, as the basic raw material of fine chemicals, is used in pesticides, spices, medicines, dyes, polymers and other industries; hydroquinone is an important intermediate in photography, rubber, dyes, pesticides, and medicines. In recent years, it is still expanding its application field. [0003] The traditional industrial production methods of catechol and hydroquinone mainly include: [0004] (1) o-chlorophenol or o-dichlorobenzene hydrolysis; [0005] (2) guaiacol (o-methoxyphenol) hydrolysis method; [0006] (3) Aniline oxidation method; [0007] (4) Dicumyl oxidation method. [0008] The reaction process of the above process is complex,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C39/08C07C37/68C07C37/70C07C37/74C07C39/04
CPCC07C37/685C07C37/70C07C37/74C07C39/08C07C39/04
Inventor 朱贵法陈敏恒
Owner JIAXING ZHONGHUA CHEM