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Process for the preparation of 2,3,3,3-tetrafluoropropene (hfo-1234yf)

A technology of tetrafluoropropylene and chlorotrifluoroethylene, applied in the field of HFO2

Active Publication Date: 2009-10-07
HONEYWELL INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since existing technologies do not meet one or more of these desired characteristics, more favorable paths are desired, especially technologies capable of large-scale production

Method used

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  • Process for the preparation of 2,3,3,3-tetrafluoropropene (hfo-1234yf)
  • Process for the preparation of 2,3,3,3-tetrafluoropropene (hfo-1234yf)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Chlorotrifluoroethylene (CTFE) vapor (0.01mol / min) and methyl chloride (0.01mol / min) are mixed and fed into a 50cc nickel tube reactor (R1), heated to 650°C by electric heating, and the residence time is about 2 seconds. While the conversion of methyl chloride was about 95%, the conversion of chlorotrifluoroethylene was about 90%, as determined by analysis of samples taken from the reactor outlet. The effluent gas from the first reactor was then fed into the second reactor (R2) with HF at 0.01 mol / min. The second reactor contained 75 cc of fluorinated chromia catalyst heated to 325°C. The contact time in the second reactor was thus about 5 seconds. The major 3-carbon species in the second reactor effluent is CF 3 CF=CH 2 (GC area % and MS analysis identified components with greater than 2 carbon atoms in 72%).

Embodiment 2

[0021] Embodiment 2 is carried out with the first reactor to replace methyl chloride with fluoromethane. In this case, CF 3 CF=CH 2 directly formed, but the conversion of chlorotrifluoroethylene and fluoromethane was greatly reduced, and CF 3 CF=CH 2 The yield (percentage of material with more than 2 carbon atoms) dropped to 37%.

Embodiment 3-6

[0023] Examples 3-6 were carried out in a similar manner to Example 1, using different reactant ratios and different reaction temperatures. The output table shows the amount of each component after passing through the second fluorination reactor.

[0024] Input table (the amount of material is mol / min)

[0025]

[0026] output table

[0027]

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Abstract

A process for the preparation of 2,3,3,3-tetrafluoropropene (HFO-1234yf). HFO-1234yf is a refrigerant with low global warming potential. A process comprises a) reacting chlorotrifluoroethylene with a methyl halide to form an intermediate product stream; and b) reacting the intermediate product stream with hydrogen fluoride to thereby produce a result comprising 2,3,3,3-tetrafluoropropene.

Description

[0001] Related Application Cross Reference [0002] This application claims the benefit of US Provisional Patent Application Serial No. 61 / 042,376, filed April 4, 2008, which is incorporated herein by reference. technical field [0003] The invention relates to a preparation process of tetrafluoropropylene. In particular, the present invention relates to the preparation process of hydrofluoroolefin 2,3,3,3-tetrafluoropropene (HFO-1234yf). HFO-1234yf is a low global warming potential refrigerant. Background technique [0004] Fluorocarbon-based fluids have been widely used in many industries, including as refrigerants, aerosol propellants, blowing agents, heat transfer media, and gas dielectrics. Since the use of some of these fluids may be associated with environmental concerns, including the associated relatively high global warming potential, it is desirable to use fluids with the lowest possible greenhouse warming potential in addition to zero ozone depletion potential ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C21/18C07C17/20C09K5/00
CPCC07C17/206C07C21/18C07C17/278C07C17/383
Inventor M·范德皮伊
Owner HONEYWELL INT INC
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