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A kind of method that takes dichloroethane as raw material to produce trichloroethylene and tetrachloroethylene

A technology of dichloroethane and trichloroethylene, applied in the chemical industry, can solve the problems of high safety technical requirements, high realization difficulty, high technical difficulty and the like, and achieves the effects of simple process, easy control, and easy availability of raw materials

Inactive Publication Date: 2011-12-07
内蒙古磐迅科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of air, the requirements for safety technology are high, the technology is difficult, and the investment is large, so it is difficult to realize

Method used

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  • A kind of method that takes dichloroethane as raw material to produce trichloroethylene and tetrachloroethylene
  • A kind of method that takes dichloroethane as raw material to produce trichloroethylene and tetrachloroethylene
  • A kind of method that takes dichloroethane as raw material to produce trichloroethylene and tetrachloroethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step (1). Vaporize dichloroethane, turn on the ultraviolet lamp in the reaction tower, then pass dichloroethane gas and chlorine gas into the reaction tower according to the molar ratio of 1:2, and control the reaction temperature to 160°C. Generate a mixture of dichloroethane / trichloroethane / tetrachloroethane / pentachloroethane / hexachloroethane (the composition of the mixture is 2.6% of dichloroethane, 30.8% of trichloroethane, 30.8% of tetrachloroethane Ethane 45.9%, pentachloroethane 18.8%, hexachloroethane 1.3%, other impurities 0.6%) and hydrogen chloride gas; dichloroethane / trichloroethane / tetrachloroethane / pentachloroethane / hexachloro The ethane mixture is condensed and enters the collector, and the hydrogen chloride gas is absorbed by water.

[0025] Step (2). The mixture of dichloroethane / trichloroethane / tetrachloroethane / pentachloroethane / hexachloroethane is moved into the rectification tower by the collector and rectified at 80~162°C; the top temperature is at...

Embodiment 2

[0030]Step (1). Evaporate dichloroethane, turn on the ultraviolet lamp in the reaction tower, then pass dichloroethane gas and chlorine gas into the reaction tower according to the molar ratio of 1:2.7, and simultaneously feed water vapor and feed The weight of water vapor is 0.05 times that of dichloroethane. Control the reaction temperature at 140°C to generate a mixture of dichloroethane / trichloroethane / tetrachloroethane / pentachloroethane / hexachloroethane (the composition of the mixture is 0.9% dichloroethane, trichloroethane ethane 8.8%, tetrachloroethane 38.3%, pentachloroethane 48.8%, hexachloroethane 2.8%, other impurities 0.4%) and hydrogen chloride gas; dichloroethane / trichloroethane / tetrachloroethane / The pentachloroethane / hexachloroethane mixture is condensed and enters the collector, and the hydrogen chloride gas is absorbed by water.

[0031] Step (2). The mixture of dichloroethane / trichloroethane / tetrachloroethane / pentachloroethane / hexachloroethane is moved into...

Embodiment 3

[0036] Step (1). Vaporize the dichloroethane, turn on the ultraviolet lamp in the reaction tower, then pass the dichloroethane gas and chlorine gas into the reaction tower according to the molar ratio of 1:3.2, and simultaneously pass into water vapor, pass into The weight of water vapor is 0.5 times that of dichloroethane. Control the reaction temperature at 100°C to generate a mixture of dichloroethane / trichloroethane / tetrachloroethane / pentachloroethane / hexachloroethane (the composition of the mixture is 0.7% dichloroethane, trichloroethane ethane 4.8%, tetrachloroethane 44.3%, pentachloroethane 49.2%, hexachloroethane 0.4%, other impurities 0.6%) and hydrogen chloride gas; dichloroethane / trichloroethane / tetrachloroethane / The pentachloroethane / hexachloroethane mixture is condensed and enters the collector, and the hydrogen chloride gas is absorbed by water.

[0037] Step (2). The mixture of dichloroethane / trichloroethane / tetrachloroethane / pentachloroethane / hexachloroethan...

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Abstract

The invention relates to a method for preparing trichloroethylene and perchloroethylene from dichloroethane as a raw material. The existing method has the defects of difficult realization and large amount of investment. The method of the invention comprises the following steps that dichloroethane undergoes chlorination to produce a mixture of dichloroethane, trichloroethane, tetrachloroethane, pentachloroethane and hexachloroethane, and hydrogen chloride gas under a dichloroethane gaseous or liquid phase; the mixture is transferred into a rectifying tower to be rectified; a tetrachloroethane / pentachloroethane mixture fraction with a top temperature of 147 to 162 DEG C is collected; the collected tetrachloroethane / pentachloroethane mixture fraction is vaporized and then is fed into a fixedbed reactor to form a trichloroethylene / perchloroethylene gas mixture; the trichloroethylene / perchloroethylene gas mixture is condensed into a liquid mixture; the liquid mixture and hydroquinone are fed into a rectifying tower to be rectified; a fraction with a top temperature of 86 to 87.5 DEG C is collected to obtain trichloroethylene finished products; and a fraction with a top temperature of 120 to 121.5 DEG C is collected to obtain perchloroethylene finished products. The method has the advantages of simple process, good controllability, easy acquirement of raw materials, low cost and little or no process wastewater or waste residue.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a method for producing trichlorethylene (TCE) and tetrachlorethylene (PCE), in particular to a method for producing trichlorethylene and tetrachlorethylene by using dichloroethane as a raw material. Background technique [0002] Trichlorethylene and tetrachlorethylene are important organic chlorine solvents and dry cleaning agents, and are also important for the production of substitutes for chlorofluorocarbon refrigerants (HFC-134a, HFC-100, HCFC-123, HCFC-124, HCFC-125). raw material. [0003] The preparation of trichlorethylene and tetrachlorethylene is currently dominated by the calcium carbide method in China, and there are also oxychlorination methods (PPG method) and ethylene direct chlorination methods abroad. [0004] The calcium carbide method is divided into saponification method and gas phase catalytic dehydrochlorination method according to different dehydroc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/25C07C21/10C07C21/12
Inventor 康宏杰钟继年杜娟
Owner 内蒙古磐迅科技有限责任公司
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