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Method for separating chloro phenol reaction solution

A technology for reaction liquid and chlorinated phenol, applied in the field of continuous separation of chlorophenol reaction liquid, can solve the problems of low production capacity and high energy consumption, and achieve the effects of large production capacity, low energy consumption and few by-products

Inactive Publication Date: 2014-04-09
JIANGSU HONGYUAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the separation method of chlorinated phenols commonly used in industry is batch rectification, which has high energy consumption and low production capacity. The purpose of this invention is to propose a method for continuous separation of chlorophenols, which can effectively save energy and improve production efficiency.

Method used

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  • Method for separating chloro phenol reaction solution

Examples

Experimental program
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Effect test

Embodiment 1

[0024] [Example 1] This method is used to separate chlorophenols, and the components and contents of the reaction solution are: o-chlorophenol (27-30%), p-chlorophenol (20-23%), 2,4-dichlorophenol (15-18%), 2,6-dichlorophenol (10-12%), phenol (1-3%), 2,4,6-trichlorophenol (8-12%) and tar (0.1-2 %). The vacuum degree of each rectification tower is controlled by a decompression device to be 2Kpa. The material of each rectification tower is titanium. The inner diameters of No. 1-5 rectification towers are 800mm, 200mm, 600mm, 1000mm, 500mm, respectively; the heights are 5m, 5m, 20m, 8m, 5m; the heating area of ​​the scraper film evaporator is 10m 2 ; The heating medium of No. 1, 2, and 3 rectification towers is 1.0Mpa saturated steam; the heating medium of No. 4 tower and scraped film evaporator is 210°C heat transfer oil. The corresponding temperature of each tower is: the top temperature of No. 1 tower is 85°C, the bottom temperature of the tower is 190°C, and o-chlorophenol ...

Embodiment 2

[0025] [Example 2] This method is used to produce p-chlorophenol, and the components and contents of the reaction solution are: o-chlorophenol (30-33%), p-chlorophenol (50-55%), 2,4-dichlorophenol (1-4%), 2,6-dichlorophenol (0.1-2%), phenol (8-13%) and tar (0.1-2%). According to each component and the corresponding content, it can be completed only through 4 sets of towers: the vacuum degree of each rectification tower is controlled to 5Kpa through the decompression device, the material of each rectification tower is enamel, and the inner diameters of No. 2-5 rectification towers are respectively 400mm, 400mm, 500mm, 500mm; the heights are 8m, 10m, 10m, 15m; the heating area of ​​the scraper film evaporator is 10m 2 ; The heating medium of No. 2 and No. 3 rectification towers is 1.0Mpa saturated steam; the heating medium of No. 4 tower and scraped film evaporator is heat transfer oil at 210°C. The corresponding temperature of each tower is: the top temperature of No. 2 tower ...

Embodiment 3

[0026] [Example 3] This method is used to produce 2,4-dichlorophenol, and the components and content of the reaction solution are: o-chlorophenol (0.5-2%), 2,4-dichlorophenol (70-76%) , 2,6-dichlorophenol (16-22%), 2,4,6-trichlorophenol (6-8%) and tar (0.1-2%). According to each component and corresponding content, it only needs to pass through 3 sets of towers, and the vacuum degree of each rectification tower is controlled to 3Kpa by a decompression device. The material of each rectification tower is carbon steel, and the inner diameter of No. 3-5 rectification towers 1000mm, 1000mm, 1200mm respectively; heights are 10m, 18m, 8m respectively; the heating area of ​​the scraper film evaporator is 25m 2 ; The heating medium of No. 3 rectification tower is 1.2Mpa saturated steam; the heating medium of No. 4 tower and scraped film evaporator is heat transfer oil at 230°C. The corresponding temperatures of each tower are: the top temperature of tower No. 3 is 92°C, the temperatur...

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Abstract

A method for a separating chloro phenol reaction solution comprises the specific steps of: enabling the chloro phenol reaction solution (the chloro phenol reaction solution is prepared by phenol and chlorine and comprises such all or part of the main components as phenol, o-chlorophenol, p-chlorophenol, 2,4-dichlorophenol, 2,6-dichlorophenol, 2,4,6-trichlorophenol and a small amount of tar) to continuously flow through a tower 1, a tower 2, a tower 3, a tower 4, a detar device (scraper film evaporator 6) and a tower 5, and controlling the temperatures of tower tops and tower bottoms of rectifying towers according to the different boiling points of the components of the reaction solution so as to separate the components from the tower tops. According to the method, the production capacity is large, the separation effect is excellent, the energy consumption is low, and the chloro phenol reaction solution is applicable to large-scale production.

Description

technical field [0001] The invention relates to the technical field of production of chlorophenols, and mainly relates to the separation of chlorophenol mixtures, in particular to a method for continuously separating chlorophenol reaction liquids. Background technique [0002] Chlorophenols are a very important class of compounds, mainly o-chlorophenol, p-chlorophenol, 2,4-dichlorophenol, 2,6-dichlorophenol, 2,4,6-trichlorophenol and so on. [0003] p-Chlorophenol is mainly used to make dyes and medicines, and is also used as a denaturant for alcohol and a selective solvent for refined mineral oil, etc. It can also be used for microscopic analysis, pharmaceutical industry, and plant growth promoter; Pesticides and dyes and other organic synthesis raw materials; 2,4-dichlorophenol is mainly used as an intermediate of fenben and a raw material for the synthesis of other pesticides; 2,6-dichlorophenol is an important medicine "diclofenac", "ERP-II " and pesticide intermediates...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C39/32C07C39/30C07C39/28C07C37/74
Inventor 孔岩张宝龙赵南高海霞
Owner JIANGSU HONGYUAN CHEM
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