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A kind of preparation method of tetrachlorethylene

A technology of tetrachlorethylene and chlorine gas, which is applied in the preparation of halogenated hydrocarbons, chemical instruments and methods, organic chemistry, etc., can solve the problems of producing a large amount of waste hydrochloric acid, uneconomical, huge environmental protection pressure, etc., and achieves low cost and low investment in equipment , the effect of improving economic efficiency

Active Publication Date: 2016-04-06
JUHUA GROUP TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when the above method prepares chlorine-containing olefins such as tetrachlorethylene and trichlorethylene, it will inevitably produce perchloro-1,3-butadiene, because perchloro-1,3-butadiene is an ozone-depleting substance (ODS for short) cannot be used directly as a product. Currently, it is usually treated by incineration, which is not only uneconomical, but also produces a large amount of waste hydrochloric acid during the incineration process, which brings huge environmental pressure. Therefore, it is found to use it as a resource method becomes more important

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] After mixing the catalyst aluminum trichloride and perchloro-1,3-butadiene at a mass ratio of 0.05:1, use a metering pump to first pass it into a quartz glass vaporizer with a diameter of 2.0 cm and a length of 1 m, and simultaneously inject Introduce chlorine gas with a molar ratio of 2:1 to perchloro-1,3-butadiene, control the temperature of the quartz glass vaporizer at 250°C, and pass the preheated mixture obtained from the outlet of the quartz glass vaporizer into a 2.0cm diameter The reaction is carried out in a quartz glass reactor with a length of 1m. The temperature of the quartz glass reactor is controlled at 350°C. The contact time between the raw material and the reactor is 1s through flow control. The pyrolysis gas obtained at the outlet of the quartz glass reactor is condensed and rectified. Obtaining product purity is the tetrachlorethylene product of 99.5%, from quartz glass reactor outlet sampling gas chromatographic analysis, perchloro-1,3-butadiene tra...

Embodiment 2

[0027] After mixing the catalyst aluminum trichloride and perchloro-1,3-butadiene at a mass ratio of 0.4:1, use a metering pump to first pass it into a quartz glass vaporizer with a diameter of 2.0cm and a length of 1m, and simultaneously inject Introduce chlorine gas with a molar ratio of 6:1 to perchloro-1,3-butadiene, control the temperature of the quartz glass vaporizer at 350°C, and pass the preheated mixture obtained from the outlet of the quartz glass vaporizer into a 2.0cm-diameter The reaction is carried out in a quartz glass reactor with a length of 1m. The temperature of the quartz glass reactor is controlled at 800°C. The contact time between the raw material and the reactor is controlled by the flow rate to be 6s. The cracked gas obtained at the outlet of the quartz glass reactor is condensed and rectified. Obtaining product purity is the tetrachlorethylene product of 99.5%, from quartz glass reactor outlet sampling gas chromatography analysis, perchloro-1,3-butadi...

Embodiment 3

[0029] After mixing the catalyst aluminum trichloride and perchloro-1,3-butadiene at a mass ratio of 0.1:1, use a metering pump to first pass it into a quartz glass vaporizer with a diameter of 2.0 cm and a length of 1 m, and simultaneously inject Introduce chlorine gas with a molar ratio of 3:1 to perchloro-1,3-butadiene, control the temperature of the quartz glass vaporizer at 450°C, and pass the preheated mixture obtained from the outlet of the quartz glass vaporizer into a 2.0cm-diameter The reaction is carried out in a quartz glass reactor with a length of 1m. The temperature of the quartz glass reactor is controlled at 600°C. The contact time between the raw material and the reactor is controlled by the flow rate to be 2s. The pyrolysis gas obtained at the outlet of the quartz glass reactor is condensed and rectified. Obtaining product purity is the tetrachlorethylene product of 99.5%, from quartz glass reactor outlet sampling gas chromatographic analysis, perchloro-1,3-b...

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PUM

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Abstract

The invention discloses a method for preparing tetrachloroethylene. The method is characterized by comprising the following steps: simultaneously introducing aluminum trichloride and a total chlorine-1,3-butadiene mixture and chlorine into a gasifier, preheating to 250-450 DEG C, further introducing the components into a reactor for reaction, and condensing and distilling a pyrolysis gas which is obtained from the reaction, thereby obtaining a tetrachloroethylene product, wherein the mass ratio of aluminum trichloride to total chlorine-1,3-butadiene is (0.01-0.5):1, the mole ratio of chlorine to total chlorine-1,3-butadiene is (1-8):1, the reaction temperature is 300-1000 DEG C, and the reaction contact time is 0.1-10 seconds. The method has the advantages that the process is simple, the raw materials are easy to obtain, the cost is low and the yield is high.

Description

technical field [0001] The invention relates to a preparation method of chlorinated olefins, in particular to a method for preparing tetrachloroethylene in one step by using perchloro-1,3-butadiene. Background technique [0002] At present, the production methods of tetrachlorethylene mainly include acetylene method, oxychlorination method, C 1 ~C 3 Thermal chlorination of hydrocarbons, direct chlorination of ethylene, etc. The acetylene method (Wacker method) is the earliest method to realize industrial production, which is produced by photochlorination of acetylene and chlorine. Later, Germany made an improvement, first synthesized trichlorethylene, further chlorinated to generate pentachloroethane, and then dehydrochlorinated to produce tetrachloroethylene. The oxychlorination method (PPG method) was successfully developed for the first time by Pittsburgh Glass Company (PPG) in the United States. vinyl chloride. The reaction of oxychlorination is very complicated, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C21/12C07C17/361
Inventor 王宗令周强耿为利吴庆郭志毅黄波钟骏良杜继立
Owner JUHUA GROUP TECH CENT