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Integrated process for the production of 1-chloro-3,3,3-trifluoropropene

  • US 9,682,905 B2
  • Filed: 01/30/2015
  • Issued: 06/20/2017
  • Est. Priority Date: 05/19/2011
  • Status: Active Grant
First Claim
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1. A mixture comprising the compound 1-chloro-3,3,3-trifluoropropene (1233zd), and further comprising one or more saturated byproduct compounds selected from the group consisting of 1,1,3,3-tetrachloro-1-fluoropropane (241fa), 1,3,3-trichloro-1,1-difluoropropane (242fa), 1,1,1-trifluoro-3,3-dichloropropane (243fa), and mixtures thereof, said byproducts being present in the mixture at an amount that is under 100 ppm;

  • wherein the 1233zd mixture is produced by the process steps of;

    (a) reacting 1,1,1,3,3-pentachloropropane (240fa) and HF in a reactor operating at a pressure of from 150 psig to 600 psig to produce a product stream comprising 1233zd, HCl and HF;

    (b) distilling the product stream from step (a) into a first overhead product and a first bottoms product rich in HF;

    (c) distilling the first overhead product from step (b) to form a second overhead product containing HCl and a second bottoms product containing organic components and HF;

    (d) phase separating the second bottoms product from step (c) to separate the HF from the organic components; and

    (e) caustic scrubbing, drying, and distilling the organic components from step (d) to provide the mixture including byproducts and 1233zd; and

    wherein the compound 1233zd in the mixture has a purity of 99.5% or greater, as measured using gas chromatography.

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