Method for simultaneously preparing 1,1,1,2,2-pentachloropropane and 2,3,3,3-tetrachloropropene

A technology of tetrachloropropene and pentachloropropane, which is applied in the field of polychlorinated hydrocarbon preparation, can solve the problems of low selectivity of HCC-240ab, unfavorable separation and purification, low utilization rate of raw materials, etc., and achieve good product selectivity and simplified process , highly selective effect

Active Publication Date: 2015-04-08
ZHEJIANG QUHUA FLUOR CHEM +1
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Problems solved by technology

[0004] HCC-240ab can be prepared by photochlorination of 1,3-dichloropropane, the reaction temperature is 60°C-80°C, the pressure is normal pressure, and it can be obtained under the conditions of solvents such as carbon tetrachloride, but the process is complicated, and HCC-240ab The selectivity of 240ab is very low, and no less than 10 kinds of by-products of chlorinated alkanes are produced, which is not conducive to separation and purification, and the utilization rate of raw materials is low
[0005] HCC-1230xf can be obtained by two-step photochlorination and two-step dehydrochlorination of 1,3-dichloropropene, but there are also complex processes, low selectivity, many by-products, and more "three wastes" produced, which is not conducive to industrial scale-up Production

Method used

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  • Method for simultaneously preparing 1,1,1,2,2-pentachloropropane and 2,3,3,3-tetrachloropropene
  • Method for simultaneously preparing 1,1,1,2,2-pentachloropropane and 2,3,3,3-tetrachloropropene
  • Method for simultaneously preparing 1,1,1,2,2-pentachloropropane and 2,3,3,3-tetrachloropropene

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Embodiment 1～9

[0034] 120ml of AlCl 3 The / C catalyst is loaded into reactor 2, the temperature is raised to 300°C, and nitrogen gas is passed through to dry for 6 hours, then the temperature is lowered to 240°C, and chlorine gas diluted with nitrogen gas is passed through, and after activation for 4 hours, the temperature of the reactor is raised to 300°C. Turn off the nitrogen gas for activation, and when there is no more water vapor overflowing from the outlet of the reactor, the activation of the catalyst is completed, and the entire activation process takes 48 hours.

[0035] Adjust the temperature of the reactor to the reaction temperature, mix the monochloromethane and tetrachlorethylene and pass it into the preheater 1, and enter the reactor 2 after preheating to react, and adjust the temperature, pressure, molar ratio and space velocity of the reaction respectively. Reaction, carry out sampling analysis at the outlet of reactor, the product is washed with water and alkali before ana...

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Abstract

The invention discloses a method for simultaneously preparing 1,1,1,2,2-pentachloropropane and 2,3,3,3-tetrachloropropene. The method comprises the following steps: carrying out a one-step reaction between methane chloride and tetrachloroethylene in the presence of a supported metal catalyst, and preparing the 1,1,1,2,2-pentachloropropane and 2,3,3,3-tetrachloropropene. The method disclosed by the invention has the advantages that the raw materials are economical and readily available, the target product is high in selectivity, the process is simple and the equipment investment cost is low.

Description

technical field [0001] The invention relates to the field of preparation of polychlorinated hydrocarbons, in particular to a method for simultaneously preparing 1,1,1,2,2-pentachloropropane and 2,3,3,3-tetrachloropropene. Background technique [0002] 2,3,3,3-Tetrafluoropropene (HFO-1234yf) is the fourth generation of refrigerant, its ozone depletion potential (ODP) is zero, the greenhouse effect value (GWP) is less than 1, the atmospheric life is 11 days, and it is non-flammable , low toxicity, it is the refrigerant with the most potential to replace HFC-134a in the future, and it is also widely used in industries such as foaming, cleaning, fire extinguishing and aerosol. [0003] The process of preparing HFO-1234yf mainly involves fluorination reaction, dehydrohalogenation reaction, etc. The fluorination reaction mainly includes liquid phase method and gas phase method. The liquid phase method generally uses Sb, Sn or Ti chloride as a catalyst, the reaction temperature is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/01C07C21/067C07C17/278C07C17/25
Inventor 杨波欧阳豪周华东张彦赵阳龚海涛胡晓伟
Owner ZHEJIANG QUHUA FLUOR CHEM
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