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Method of producing hexafluorobenzene from byproduct wastes of tetrachloroethylene

A technology of tetrachlorethylene and waste, applied in the field of production of hexafluorobenzene and methods from tetrachlorethylene by-product waste, can solve the problems of poor recovery, low catalytic efficiency, environmental damage, etc., to avoid difficult separation, phase Good capacitance, the effect of reducing output

Inactive Publication Date: 2017-08-29
衢州乾达科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hexachlorobenzene is a persistent organic pollutant that is difficult to degrade. At present, most domestic manufacturers do not recycle it well. Most of them are directly discharged or incinerated after simple treatment, which not only causes damage to the environment, but is also uneconomical.
[0007] The prior art in the prior art does not use catalytic efficiency is low, the yield of hexafluorobenzene per pass is not more than 46%, side reactions are many, easy to coke, using hexachlorobenzene as raw material costs high, and tetrachloroethylene by-product Waste as a raw material can turn waste into treasure and reduce costs, but it will also generate new waste, and more efficient preparation methods need to be found

Method used

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  • Method of producing hexafluorobenzene from byproduct wastes of tetrachloroethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of ionic liquid solvent: by weight, 100 parts of diphenyl ether, 0.03 parts of vitamin B12 (Vitamin B12), 0.2 parts of 1-methyl-1-propylpyrrolidine bis(trifluoromethanesulfonyl ) imine salt and 2 parts of 1-aminopropyl-3-methylimidazolium hexafluorophosphate were added to the reaction kettle and mixed at room temperature for 7 hours to obtain an ionic liquid solvent;

[0026] (2) Preparation of hexafluorobenzene:

[0027] By weight, with 100 parts of perchlorethylene by-product waste, containing 88 parts of hexachlorobenzene; 10 parts of octachlorotoluene; 2 parts of other impurities, 200 parts of dry KF, 500 parts of ionic liquid solvent, 7 parts of polystyrene The loaded quaternary phosphorus salt type resin catalyst is put into the reactor, and the system gradually heats up to react. As the reaction progresses, the products polyfluorobenzene and perfluorobenzene gasify, and the system pressure gradually increases. The reaction temperature is 420°C an...

Embodiment 2

[0031] (1) Preparation of ionic liquid solvent: by weight, 100 parts of tetraglyme, 0.01 part of vitamin B12 (VitaminB12), 0.05 part of 1-methyl-1-propylpyrrolidine bis(trifluoromethyl Sulfonyl)imide salt, 1 part of 1-aminopropyl-3-methylimidazolium hexafluorophosphate, was added to the reaction kettle and mixed at room temperature for 5 hours to prepare the ionic liquid solvent;

[0032] (2) Preparation of hexafluorobenzene:

[0033] By weight, with 100 parts of perchlorethylene by-product waste, containing 70 parts of hexachlorobenzene; 25 parts of octachlorotoluene; 5 parts of other impurities, 100 parts of dry KF, 300 parts of ionic liquid solvent, 5 parts of polystyrene The loaded quaternary phosphorus salt type resin catalyst is put into the reactor, and the system gradually heats up to react. As the reaction proceeds, the products polyfluorobenzene and perfluorobenzene gasify, and the system pressure gradually increases. The reaction temperature is 380°C and the reacti...

Embodiment 3

[0037] (1) Preparation of ionic liquid solvent: by weight, 100 parts of sulfolane, 0.1 part of vitamin B12 (Vitamin B12), 0.5 part of 1-methyl-1-propylpyrrolidine bis(trifluoromethanesulfonyl) Amine salt, 5 parts of 1-aminopropyl-3-methylimidazolium hexafluorophosphate, was added to the reaction kettle and mixed at room temperature for 10 hours to prepare the ionic liquid solvent;

[0038] (2) Preparation of hexafluorobenzene:

[0039]By weight, with 100 parts of perchlorethylene by-product waste, containing 94 parts of hexachlorobenzene; 5 parts of octachlorotoluene; 1 part of other impurities, 300 parts of dry KF, 800 parts of ionic liquid solvent, 15 parts of polystyrene The loaded quaternary phosphorus salt type resin catalyst is put into the reactor, and the system gradually heats up to react. As the reaction proceeds, the products polyfluorobenzene and perfluorobenzene gasify, and the system pressure gradually increases. The reaction temperature is 520°C and the reactio...

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Abstract

The invention provides a method of producing hexafluorobenzene from byproduct wastes of tetrachloroethylene. The method includes the steps of: preparing an ionic liquid solvent; adding the byproduct wastes of tetrachloroethylene, dried KF, the ionic liquid solvent, and a polystyrene supporting quaternary phosphonium salt type resin catalyst into a reaction kettle; and gradually increasing the temperature of the system to perform a reaction, thus producing the products, including hexafluorobenzene and monochloropentafluorobenzene.

Description

technical field [0001] The invention relates to a method for utilizing industrial waste, in particular to a method for producing hexafluorobenzene and hexafluorobenzene from tetrachlorethylene by-product waste. Background technique [0002] During the production process of the tetrachlorethylene plant, a mixture waste liquid containing carbon tetrachloride, tetrachloroethylene, hexachloroethane, hexachlorobutadiene, hexachlorobenzene and other organic substances will be generated, and these organic substances are simply separated. The heavy component waste liquid contains hexachlorobenzene, octachlorotoluene and other organic impurities. Hexachlorobenzene is a persistent organic pollutant that is difficult to degrade. At present, most domestic manufacturers do not recycle it well. Most of them are directly discharged or incinerated after simple treatment, which not only causes damage to the environment, but is also uneconomical. Therefore, it has very important social and e...

Claims

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Application Information

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IPC IPC(8): C07C17/20C07C25/13
CPCC07C17/208C07C25/13Y02P20/54
Inventor 吴晓秉冯晓亮曹鸣应亚斐
Owner 衢州乾达科技有限公司
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