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Industrial preparation method for tetrachloroethylene

An industrial technology of tetrachlorethylene, which is applied in the field of industrial production of tetrachlorethylene, can solve problems such as difficult handling and unsuitability for industrial production, and achieve the effect of realizing utilization

Inactive Publication Date: 2012-12-12
自贡鸿鹤化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] U.S. Patent 1930350 is pyrolyzed at 600-1500°C, and U.S. Patent 3364272 is pyrolyzed at 800°C to produce tetrachlorethylene. The high-temperature pyrolysis method will generate a large number of heavy components, which is difficult to handle and is not suitable for industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: Example when using natural gas.

[0038] Natural gas (normal temperature) 130Nm 3 / h, excess chlorine gas (85°C) 0.9-1.1t / h, superheated carbon tetrachloride vapor (240°C) 2.5-3.0 t / h, introduced into the reactor to maintain the reaction temperature at 550-600°C, and react Under the condition of pressure 0.1-0.15Mpa, the reaction produces tetrachlorethylene, and the product is about 1.18 t / h crude tetrachlorethylene and 520 Nm 3 / h hydrogen chloride, the reaction mixture is quickly removed from the reactor to the quenching tower to make the reaction more complete, and the separated heavy components are removed from the quenching tower, recovered and recycled to the reactor. Reaction mechanism:

[0039] CH 4 +4Cl 2 → CCl 4 + 4HCl (1)

[0040] 2CCl 4 ?C 2 Cl 4 + 2Cl 2 (2)

[0041] CH 3 Cl+Cl 2 +CCl 4 → C. 2 Cl 4 + 4HCl (3)

Embodiment 2

[0042] Embodiment 2: Preparing tetrachloroethylene with monochloromethane, carbon tetrachloride and chlorine as raw materials.

[0043]Dichloromethane (20-40°C) 180Nm 3 / h, excess chlorine gas (85°C) 0.9-1.1t / h, superheated carbon tetrachloride vapor (240°C) 2.5-3.0 t / h, introduced into the reactor to maintain the reaction temperature at 550-620°C, the reaction Under the condition of pressure 0.1-0.15Mpa, the reaction produces tetrachlorethylene, and the product is about 1.21 t / h crude tetrachlorethylene and 540 Nm 3 / h hydrogen chloride, the reaction mixture is quickly moved out of the reactor to the quenching tower to make the reaction more complete, after the reaction gas is cooled in the quenching tower, the light component hydrogen chloride and carbon tetrachloride go out from the top of the tower, and the thick tetrachlorethylene from The side line of the quenching tower is taken out, and then rectified and purified, and the heavy components are removed from the quenchi...

Embodiment 3

[0044] Embodiment 3: Preparing tetrachloroethylene with monochloromethane, dichloromethane and chlorine as raw materials.

[0045] Chloromethane 40Nm heated to 20℃~40℃ 3 / h, chlorine gas at 85°C 0.9-1.1t / h, dichloromethane heated and vaporized to about 50°C 210 Nm 3 / h into the reactor. The temperature of the reactor is controlled between 560°C and 620°C, and the reaction pressure is 0.1-0.15Mpa to generate tetrachlorethylene, and the product is about 0.62 t / h crude tetrachlorethylene and 540 Nm 3 / h of hydrogen chloride, the reaction mixture is quickly removed from the reactor to the quenching tower to make the reaction more complete, and the separated heavy components are removed from the quenching tower, recycled and recycled to the reactor to generate tetrachloroethylene.

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PUM

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Abstract

The present invention provides an industrial production method for tetrachloroethylene. The method is characterized by adopting monochloromethane or natural gas, excess chlorine gas, and a methane chloride as raw materials, and carrying out a reaction to produce tetrachloroethylene, wherein the methane chloride is any one or a mixture selected from dichloromethane, trichloromethane, and carbon tetrachloride according to any ratios. The preparation method of the present invention has the following advantages that: raw material conversion rate is high, the produced heavy component is decomposed, and then can return to a reactor to generate tetrachloroethylene, and the by-produced hydrogen chloride can be converted into monochloromethane for providing a raw material for a methane chloride apparatus or a tetrachloroethylene synthesis apparatus so as to achieve maximum chlorine resource utilization.

Description

technical field [0001] The invention relates to an industrial production method of tetrachlorethylene, which belongs to the technical field of chlor-alkali. Background technique [0002] Carbon tetrachloride is a controlled ODS substance stipulated in the Montreal Protocol on Substances that Deplete the Ozone Layer. China has begun to phase out and restrict the use of carbon tetrachloride. The carbon tetrachloride produced by the domestic methane chloride plant needs to be effectively treated before it can be produced. Therefore, it is better to convert carbon tetrachloride into tetrachlorethylene. way out. [0003] Tetrachloroethylene is a substance that is harmless to the environment. It has been used as a cleaning agent for a long time in the past. With the acceleration of the process of eliminating HCFC-22, the demand for pentafluoroethane (HFC-125) is increasing rapidly. The use of main production raw materials has been developed, and its market prospect is promising....

Claims

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Application Information

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IPC IPC(8): C07C21/12C07C17/269C07C17/263C07C17/25
Inventor 郭戈程新玉赵正东李红林殷杰信黄泽华
Owner 自贡鸿鹤化工股份有限公司
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