Process for the production of e-1,3,3,3-tetrafluoropropene (hfc-1234ze) by dehydrofluorination

LT3872057TActive Publication Date: 2026-07-10THE CHEMOURS CO FC LLC

Patent Information

Authority / Receiving Office: LT · LT
Patent Type: Patents
Current Assignee / Owner: THE CHEMOURS CO FC LLC
Filing Date: 2015-08-06
Publication Date: 2026-07-10

AI Technical Summary

Technical Problem

Current manufacturing processes for producing HFC-1234ze and HFC-1234yf refrigerants result in a mixture of E- and Z-isomers, requiring additional costly steps for separation and isomerization, leading to inefficiencies and increased costs.

Method used

A method involving contacting a mixture of 1,1,1,3,3-pentafluoropropane and Z-1,3,3,3-tetrafluoropropene with a catalyst like fluorinated Cr2O3 or Cr/Ni on fluorided alumina in the gas phase, followed by separation and recycling of the E-isomer, to enhance selectivity and efficiency in producing the desired E-isomer.

Benefits of technology

This approach significantly increases the selectivity for the E-isomer, reducing yield losses and eliminating the need for additional steps, thereby improving the economic viability and efficiency of the production process.

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Abstract

A method of producing a fluoropropene of formula CF3CH=CHF, comprising contacting a mixture of 1,1,1,3,3-pentafluoropropane and Z-1,3,3,3-tetrafluoropropene in the gas phase with a catalyst comprising at least one catalyst selected from the group consisting of fluorinated Cr2O3 or Cr / Ni on fluoride alumina, in the presence of an oxygen containing gas, to form a mixture comprising Z-1,3,3,3-tetrafluoropropane, E-1,3,3,3-tetrafluoropropene, hydrogen fluoride, and optionally unreacted 1,1,1,3,3-pentafluoropropane, separating the E-1,3,3,3-tetrafluoropropene from the Z-isomer and any unreacted 1,1,1,3,3-pentafluoropropane, if present, and recovering said E-1,3,3,3-tetrafluoropropene.

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