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Method for simultaneously preparing 1,1,1,2-tetrafluoroethane and 1,1,1-trifluoroethane

A kind of technology of trifluoroethane and tetrafluoroethane, applied in the field of preparation of hydrofluorocarbons

Active Publication Date: 2008-05-28
ZHEJIANG QUHUA FLUOR CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And the method for preparing 1,1,1,2-tetrafluoroethane and 1,1,1-trifluoroethane simultaneously has not been reported

Method used

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  • Method for simultaneously preparing 1,1,1,2-tetrafluoroethane and 1,1,1-trifluoroethane

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Embodiment 1

[0035] After vaporizing VDC, TCE, and HF, they are mixed into a 640ml carbon steel fixed-bed reactor with material receiving conditions, and the fluorination reaction is carried out under the action of a chromium-based catalyst, controlling AHF / (TCE+VDC)=30:1, the reaction Temperature 300°C, pressure 0.7Mpa, (under standard conditions) reactor space velocity 1000h -1 After the reaction, the gas is condensed and deacidified to remove the acidic substance HCL / AHF, and then purified to further remove the acidic and other by-product substances, and the crude product is separated by rectification to obtain HFC-134a and HFC-143a. Sampling and analysis of the material at the outlet of the reactor shows that the conversion rate of TCE and VDC is 99.9%, and the selectivity of HFC-134a and HFC-143a is 99.9%.

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Abstract

The invention relates to a preparation method of alkane that contains fluorin, in particular to a method of preparing 1, 1, 1, 2-tetra fluoro ethane and 1, 1, 1-trifluoroethane. The technical proposal of the invention is that trichloroethylene, vinylidene chloride and anhydrous hydrogen fluoride are adopted as raw materials in the presence of chromium base fluorination catalyst; unit operations of gaseous phase fluorination catalytic reaction, condensation, de-acidification, purification, rectification, etc., are conducted to produce two products of 1, 1, 1, 2-tetra fluoro ethane and 1, 1, 1-trifluoroethane in the same device.

Description

technical field [0001] The present invention relates to a process for the preparation of hydrofluorocarbons (HFCs). Specifically, it relates to a method for simultaneously producing 1,1,1,2-tetrafluoroethane and 1,1,1-trifluoroethane. Background technique [0002] Due to the traditional widely used CF 2 CL 2 、CHF 2 Refrigerants such as CL and R5O2 are chlorine-containing halogenated alkanes, which will destroy the ozone layer on the earth, so their use is restricted or prohibited by a series of international treaties. The substitutes for chlorine-containing halogenated alkane refrigerants are some chlorine-free fluoroalkanes, such as 1,1,1-trifluoroethane (hereinafter referred to as HFC-143a), 1,1,1,2 - Tetrafluoroethane (hereinafter referred to as HFC-134a), difluoromethane (HFC-32) and the like. [0003] HFC-143a has zero ozone depletion potential (ODP). As a refrigerant, its volumetric cooling capacity is greater than that of HCFC-22, and its exhaust temperature is l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C21/18C07C17/087
Inventor 周黎旸陈科峰王爱国张学良贺辉龙蒋光辉屠仁华马小红
Owner ZHEJIANG QUHUA FLUOR CHEM