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A method for recovering tetrachlorethylene and hexachloroethane from heavy component waste liquid produced by tetrachlorethylene plant

A technology of tetrachloroethylene and hexachloroethane, which is applied in chemical instruments and methods, halogenated hydrocarbon preparation, organic chemistry and other directions, can solve the problems of heavy component waste liquid treatment difficulty and other problems, and achieve the effect of cost saving

Active Publication Date: 2018-05-04
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 present invention relates to a method for recovering tetrachloroethylene and hexachloroethane from the heavy component waste liquid produced by the tetrachlorethylene plant, comprising the following steps: (1) sending the heavy component waste liquid produced by the tetrachlorethylene plant into the recombination Fractional rectification tower carries out rectification, (2) the component that the heavy component rectification tower top obtains is sent back to the heavy fraction rectification tower reflux after condensation, and another part is sent back to the perchlorethylene plant refining unit for refining, Get the tetrachloroethylene product; (3) the component obtained at the bottom of the heavy component rectification tower is sent to the hexachloroethane rectification tower for rectification, (4) the hexachloroethane rectification tower top component is condensed, Crush to obtain hexachloroethane products. The present invention precisely controls the temperature of the top and bottom of the heavy component rectification tower and the hexachloroethane rectification tower to avoid the problem of easy blockage of pipelines and equipment during the recovery process; The waste liquid is difficult to solve, and the discharge smell is big.

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 Patents(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