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Method for recovering tetrachloroethylene and hexachloroethane from waste liquid of heavy components produced by tetrachloroethylene apparatus

A technology of tetrachlorethylene and hexachloroethane, which is applied in chemical instruments and methods, preparation of halogenated hydrocarbons, organic chemistry, etc., can solve the problems of heavy component waste liquid treatment such as difficulty, and achieve the effect of cost saving

Active Publication Date: 2016-07-27
SHANDONG DONGYUE FLUO SILICON MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art and solving the problem that the heavy component waste liquid generated in the production process of tetrachlorethylene is difficult to deal with, the present invention provides a method for recovering tetrachloroethylene and hexachloride from the heavy component waste liquid produced by the tetrachlorethylene plant. ethane method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The main components of the heavy component waste liquid produced by the tetrachlorethylene plant in this embodiment: carbon tetrachloride 1.86%, tetrachloroethylene 48%, pentachloroethane: 0.16%, hexachloroethane 20.62%, hexachlorobutadiene 29.35%.

[0027] A method for reclaiming tetrachlorethylene and hexachloroethane from the heavy component waste liquid that tetrachlorethylene plant produces comprises the following steps:

[0028] (1) Enter the heavy component waste liquid produced by the tetrachlorethylene unit into the heavy component rectification tower, control the bottom temperature of the heavy component rectification tower to 192.6°C, the tower bottom pressure to 0.003MPa, and the tower top temperature to 123.8°C;

[0029] (2) Part of the components obtained at the top of the heavy component rectification tower are condensed at 42°C and sent back to the heavy component rectification tower for reflux, with a reflux rate of 0.5m 3 / h, the reflux ratio is 0.5, ...

Embodiment 2

[0034] The main components of the heavy component waste liquid produced by the tetrachlorethylene plant in this embodiment: carbon tetrachloride 0.58%, tetrachloroethylene 47.52%, pentachloroethane 0.04%, hexachloroethane 18.84%, hexachlorobutadiene 33.01% %.

[0035] A method for reclaiming tetrachlorethylene and hexachloroethane from the heavy component waste liquid that tetrachlorethylene plant produces comprises the following steps:

[0036] (1) Enter the heavy component waste liquid produced by the tetrachlorethylene plant into the heavy component rectification tower, control the bottom temperature of the heavy component rectification tower to 195.2°C, the tower bottom pressure to 0.005MPa, and the tower top temperature to 124.9°C;

[0037] (2) Part of the components obtained at the top of the heavy component rectification tower are condensed at 45.8°C and sent back to the heavy component rectification tower for reflux, with a reflux rate of 0.49m 3 / h, the reflux ratio ...

Embodiment 3

[0042] The main components of the heavy component waste liquid produced by the tetrachlorethylene plant in this embodiment: 1.75% carbon tetrachloride, 48.52% tetrachlorethylene, 0.12% pentachloroethane, 19.58% hexachloroethane, 30.02% hexachlorobutadiene %.

[0043] A method for reclaiming tetrachlorethylene and hexachloroethane from the heavy component waste liquid that tetrachlorethylene plant produces comprises the following steps:

[0044] (1) Enter the heavy component waste liquid produced by the tetrachlorethylene plant into the heavy component rectification tower, control the bottom temperature of the heavy component rectification tower to 197.3°C, the tower bottom pressure to 0.007MPa, and the tower top temperature to 127.1°C;

[0045] (2) Part of the components obtained from the top of the heavy component rectification tower are condensed at 36.9°C and sent back to the heavy component rectification tower for reflux, with a reflux rate of 0.52m 3 / h, the reflux ratio...

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Abstract

The invention relates to a method for recovering tetrachloroethylene and hexachloroethane from the waste liquid of heavy components produced by a tetrachloroethylene apparatus. The method comprises the following steps: (1) delivering the waste liquid of heavy components produced by the tetrachloroethylene apparatus to a heavy component rectifying tower for rectification; (2) subjecting components obtained at the top of the heavy component rectifying tower to condensation, then sending a part of the condensed components back to the heavy component rectifying tower and delivering the rest condensed components to a refining unit of the tetrachloroethylene apparatus for refining so as to obtain a tetrachloroethylene product; (3) delivering components obtained at the bottom of the heavy component rectifying tower to a hexachloroethane rectifying tower for rectification; and (4) subjecting components obtained at the top of the hexachloroethane rectifying tower to condensation and crushing so as to obtain a hexachloroethane product. The method prevents the problem that pipelines and equipment are prone to obstruction in the process of recovery by accurately controlling tower-top and tower-bottom temperatures of the heavy component rectifying tower and the hexachloroethane rectifying tower, and effectively overcomes the technical problems that the waste liquid of heavy components produced by the tetrachloroethylene apparatus is difficult to treat, the smell of the discharged waste liquid is great and the like.

Description

technical field [0001] The invention relates to a treatment method for heavy component waste liquid produced by a tetrachlorethylene plant, in particular to a method for recovering tetrachlorethylene and hexachloroethane from the heavy component waste liquid produced by a tetrachlorethylene plant, which belongs to chemical technology field. Background technique [0002] The existing domestic tetrachlorethylene plant has a production capacity of more than 300,000 tons per year, and the tetrachlorethylene plant will generate carbon tetrachloride, tetrachlorethylene, hexachloroethane, hexachlorobutadiene, and hexachlorobenzene during the production process. A mixture of various organic substances such as waste liquid, these organic substances are mostly heavy components (hereinafter referred to as the above-mentioned mixture waste liquid for short as heavy component waste liquid). The heavy component waste liquid has a strong discharge odor, and the treatment process is compli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C21/12C07C19/043C07C17/383
Inventor 于海涛张晶群徐学军
Owner SHANDONG DONGYUE FLUO SILICON MATERIALS CO LTD