Method for preparing 1,3,3,3-tetrafluoropropene by gas phase fluorination

A technology of tetrafluoropropene and gas-phase fluorination, which is applied in chemical instruments and methods, halogen substitution preparation, organic chemistry, etc., can solve the problem of low yield of HFO-1234ze and achieve high reaction yield
CN101913985AActive Publication Date: 2010-12-15XIAN MODERN CHEM RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAN MODERN CHEM RES INST
Publication Date
2010-12-15
Patent Text Reader

Abstract

The invention discloses a preparation method of 1,3,3,3-tetrafluoropropene. The method takes 1-Cl-3,3,3-trifluoropropene as a raw material and comprises the following steps of: performing the reaction of hydrogen fluoride (HF) and the 1-Cl-3,3,3-trifluoropropene under the catalytic action of a fluorinated catalyst, wherein the reaction conditions are as follow: the mol ratio of the HF and the 1-Cl-3,3,3-trifluoropropene is 5-15:1, the contact time is 2 to 20 seconds, the reaction temperature is 300 to 450 DEG C, precursors of the fluorinated catalyst comprise 60 percent by mass of calcium fluoride, 30 percent by mass of iron hydroxide and 10 percent by mass of calcium carbonate, and the fluorinated catalyst can be prepared by evenly mixing the precursors of the fluorinated catalyst, pressing and moulding, roasting at 450 DEG C and carrying out the fluorination by using hydrogen fluoride gas at 400 DEG C. The invention is mainly used for preparing the 1,3,3,3-tetrafluoropropene.
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Description

technical field

[0001] The invention relates to a method for preparing 1,3,3,3-tetrafluoropropene by gas-phase fluorination, in particular to a gas-phase fluorination of 1-chloro-3,3 in the next step under the catalysis of a calcium fluoride-based fluorination catalyst. , A method for preparing 1,3,3,3-tetrafluoropropene (HFO-1234ze) from 3-trifluoropropene (HCFC-1233zd). Background technique

[0002] Chlorofluorocarbons (CFCs) are harmful to the Earth's ozone layer, and many hydrofluorocarbons (HFCs) used to replace CFCs contribute to global warming. HFOs will not destroy the ozone layer, nor will it cause global warming, and are being considered for use in refrigerants, cleaning agents, foaming agents, aerosol propellants, etc., of which 1,3,3,3-tetrafluoropropene (HFO -1234ze) is used in blowing agent to replace 1,1,1,2 tetrafluoroethane (HFC-134a).

[0003] Currently, gas phase fluorination of halogenated hydrocarbons is often used to prepare hydrofluoroolefins in fluo...

Claims

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