Method for producing fluorinated organic compounds
Active Publication Date: 2009-11-19
HONEYWELL INT INC
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[0011]Applicants have found a method of producing HFO-1234yf from tetrachloropropene (TCP) that involves using a single reactor or reactor system to conduct two different reaction steps contemporaneously, namely fluorination of tetrachloropropene to produce an HFCO-1233xf intermediate and dehydrochlorination of HCFC-244bb to produce
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Although this appears to be a relatively high-yield process, for commercial scale production the handling of hydrogen gas at high temperature raises difficult safety-related questions.
Also, the cost of producing hydrogen gas, such as building
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[0041]The following prophetic example is a preferred embodiment that is provided to further illustrate certain aspect of the invention.
[0042]With reference to FIGS. 1 and 2, shown is an integrated process for the production of HFO-1234yf from tetrachloropropene (TCP) in three reaction steps where the first (exothermic) and third (endothermic) reactions are carried out in a single reactor or reaction zone. The process is summarized as follows:
Step 1: Hydrofluorination of TCP to HCFO-1233xf and dehydrochlorination of intermediate HCFC-244bb (formed in a separate reactor as described below) occur in a single reactor system using a series of reactors or multi-stage reactor, or combination of reactor design, as illustrated on the attached process flowsheet. The reactor is either segregated into alternating beds of fluorination / dehydrochlorination zones or a homogeneous mixture of fluorination catalyst and dehydrochlorination catalyst. The exotherm of the hydrofluorination reaction...
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Abstract
Disclosed is a process for producing tetrafluoropropene comprising: (a) catalytically fluorinating at least one tetrafluoropropene in a first reactor to produce HCFO-1233xf; (b) reacting said HCFO-1233xf with hydrogen fluoride in a second reactor to produce HCFC-244bb; (c) recycling at least a portion of said HCFC-244bb back to said first reactor as recycled HCFC-244bb; and (d) catalytically dehydrochlorinating said recycled HCFC-244bb in said first reactor to produce HFO-1234yf.
Description
RELATED APPLICATIONS[0001]The present application is related to and claims the priority benefit of U.S. Provisional Application No. 61 / 053,647, which was filed on May 15, 2008, and which is incorporated herein by reference.BACKGROUND OF INVENTION[0002](1) Field of Invention[0003]This invention relates to novel methods for preparing fluorinated organic compounds, and more particularly to methods of producing fluorinated olefins.[0004](2) Description of Related Art[0005]Hydrofluorocarbons (HFC's), in particular hydrofluoroalkenes such as tetrafluoropropenes (including 2,3,3,3-tetrafluoro-1-propene (HFO-1234yf) and 1,3,3,3-tetrafluoro-1-propene (HFO-1234ze)) have been disclosed to be effective refrigerants, fire extinguishants, heat transfer media, propellants, foaming agents, blowing agents, gaseous dielectrics, sterilant carriers, polymerization media, particulate removal fluids, carrier fluids, buffing abrasive agents, displacement drying agents and power cycle working fluids. Unlik...
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