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Method for extracting trans-dichloroethylene from low-boiling residue of ethinyltrichloride production by gas-phase catalytic process

A technology of dichloroethylene and trichloroethylene, applied in organic chemistry, disproportionation separation/purification of halogenated hydrocarbons, etc., can solve environmental pollution, energy waste and other problems, achieve the effect of reducing environmental pollution and realizing waste utilization

Active Publication Date: 2009-01-28
何勇志
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] Trans-dichloroethylene is contained in the low boilers of trichlorethylene produced by gas-phase catalytic dehydrochlorination, but these low boilers have been directly treated as waste emissions, which not only cause environmental pollution, but also cause energy waste

Method used

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Examples

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Embodiment Construction

[0016] 1. Calcium carbide hydrolysis

[0017] The production principle of this process is as follows:

[0018] CaC 2 +2H 2 O→C 2 h 2 +Ca(OH) 2

[0019] Feeding: After loading the broken calcium carbide into the bucket, it goes into the generator through the electromagnetic oscillator. In the generator, the calcium carbide undergoes hydrolysis reaction with water to generate acetylene gas, which escapes from the top of the generator, passes through the acetylene cleaner, is positively water-sealed, part of the cooling tower goes to the water ring pump, and part goes to the gas cabinet. The heat released during the reaction is continuously added to the generator with the help of NaClO wastewater, cooling tower wastewater and tap water to control the temperature of the generator at 86±2°C. The thin slurry flows out from the overflow pipe, and the thick slurry and its impurities are discharged from the slag. Posts are released on a regular basis. Cleaning: the cooled acety...

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Abstract

The invention relates to a method for extracting trans-dichloroethylene from low-boiling-point materials which are used for producing trichloroethylene by the gas phase catalysis. The method is characterized in that the low-boiling-point materials which are used for producing the trichloroethylene by the gas phase catalysis is deacidified, dehydrated and sent in a distilling kettle for distilling, and the trans-dichloroethylene is collected at the temperature of 47-49 DEG C. A trans-dichloroethylene product with the purity being more than 99% can be obtained by the method of the invention. The method utilizes wastes and reduces environmental pollution.

Description

technical field [0001] The invention relates to the technical field of production of chlorinated hydrocarbons, in particular to a method for extracting trans-dichloroethylene from low boilers produced by a gas-phase catalytic method to produce trichlorethylene. Background technique [0002] For a long time, trichlorethylene and tetrachlorethylene have been widely used as the best organic solvents and low-temperature extraction agents in the domestic solvent market due to their low toxicity, easy volatility and stable performance. However, recent studies have shown that the use of a large amount of trichlorethylene and tetrachlorethylene will increase the global warming effect. Therefore, it is the current solvent to look for an environmentally friendly organic solvent and low-temperature extractant that can replace trichlorethylene and tetrachlorethylene. The market urgently needs to solve the problem. [0003] Trans-dichloroethylene, its chemical name is 1.2-dichloroethyle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C21/08C07C17/38
Inventor 何勇志
Owner 何勇志
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