A recovery method for rectification raffinate in tetrachlorethylene production

A technology of tetrachlorethylene and recovery methods, which is applied in chemical instruments and methods, preparation of halogenated hydrocarbons, preparation of dehydrohalogenation, etc., can solve the problems of large emission loss of components, increase of income, large amount of residual liquid treatment, etc., and achieve The effects of reducing corrosion, solving large emission losses, and increasing production

Active Publication Date: 2018-09-11
LUZHOU XINFU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem of easy blockage of high-chloride rectification and separation equipment in tetrachlorethylene kettle liquid, the present invention proposes a recovery method for rectification raffinate in tetrachlorethylene production
It can effectively solve the problems of large discharge loss of useful components and large amount of raffinate treatment in the conventional heavy component concentration recovery method, and can effectively recover tetrachlorethylene in heavy components and fully separate hexachloroethane products, thereby reducing losses. Reduce costs, increase revenue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for recovering rectification raffinate in tetrachlorethylene production, comprising the following steps:

[0027] A. In the production of tetrachlorethylene, the heavy components of the quenching tower still enter the light removal tower and the tetrachlorethylene rectification tower in turn, and the tower still liquid enters the tetrachlorethylene removal tower again for secondary rectification, and further separates and recovers tetrachlorethylene ;

[0028] B. The tower still liquid after removing tetrachlorethylene enters the pentachloroethane rectifying tower, and the tower still liquid enters the hexachloroethane rectifying tower to obtain the hexachloroethane product.

Embodiment 2

[0030] A method for recovering rectification raffinate in tetrachlorethylene production, comprising the following steps:

[0031] A. In the production of tetrachlorethylene, the heavy components of the quenching tower still enter the light removal tower and the tetrachlorethylene rectification tower in turn, and the tower still liquid enters the tetrachlorethylene removal tower again for secondary rectification, and further separates and recovers tetrachlorethylene ;

[0032] B. The tower still liquid after removing tetrachlorethylene enters the pentachloroethane rectifying tower, and the tower still liquid enters the hexachloroethane rectifying tower to obtain the hexachloroethane product.

[0033] The temperature at the top of the light removal tower is 76°C and the pressure is 8kpa; the temperature at the bottom of the tower is 145°C and the pressure is 105kpa.

Embodiment 3

[0035] A method for recovering rectification raffinate in tetrachlorethylene production, comprising the following steps:

[0036] A. In the production of tetrachlorethylene, the heavy components of the quenching tower still enter the light removal tower and the tetrachlorethylene rectification tower in turn, and the tower still liquid enters the tetrachlorethylene removal tower again for secondary rectification, and further separates and recovers tetrachlorethylene ;

[0037] B. The tower still liquid after removing tetrachlorethylene enters the pentachloroethane rectifying tower, and the tower still liquid enters the hexachloroethane rectifying tower to obtain the hexachloroethane product.

[0038] The temperature at the top of the light removal tower is 80°C and the pressure is 10kpa; the temperature at the bottom of the tower is 155°C and the pressure is 125kpa.

[0039] The temperature at the top of the tetrachlorethylene rectification tower is 124°C and the pressure is 5...

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Abstract

The invention provides a recovery method of rectification residue liquid during tetrachloroethylene production. The method comprises the steps that during the tetrachloroethylene production, heavy ingredients of a quench tower kettle sequentially enter a light removing tower and a tetrachloroethylene rectification tower; tower kettle liquid enters a tetrachloroethylene removing tower again for secondary rectification; the tetrachloroethylene is further separated and recovered; tower kettle liquid after the tetrachloroethylene removal enters a pentachloroethane rectification tower; the tower kettle liquid enters a hexachloroethane rectification tower to obtain a hexachloroethane product. The problems of great useful ingredient discharge loss and great residue liquid processing quantity in a conventional heavy ingredient concentration recovery method can be effectively solved. The tetrachloroethylene in the heavy ingredients can be effectively recovered; the hexachloroethane product is sufficiently separated out, so that the loss is reduced; the cost is reduced; the benefits are increased.

Description

technical field [0001] The invention belongs to the technical field of chemical waste liquid treatment, and in particular relates to a method for recovering rectification raffinate in tetrachlorethylene production. Background technique [0002] The heavy component in the production of tetrachlorethylene is hexachloride, the main components are tetrachloroethylene and hexachloroethane, and there are a small amount of pentachloroethane, hexachlorobutadiene and hexachlorobenzene, and its output is about tetrachlorethylene 10% of the volume of ethylene products. The current tetrachlorethylene production unit is generally pumped from the quench tower and the tetrachlorethylene rectification tower to the heavy component concentration and recovery system for evaporation and concentration recovery. In order to allow the production unit to operate stably and continuously, the evaporation and concentration temperature All controlled below 200°C. After exceeding 200°C, a large amount...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/383C07C17/25C07C21/12C07C19/043
Inventor 万大林余明富李万清邬瑞东杨前兵刘廷琴王文俊王斌
Owner LUZHOU XINFU CHEM
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