Process and compositions to remove 1243zf from 1252zc using a solution of a metal-hydride catalyst in a liquid hydrosilane

EP4747221A1Pending Publication Date: 2026-05-27THE CHEMOURS CO FC LLC
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Patent Information

Application Number
EP2024746158
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-03-14
Filing Date
2024-07-09
Publication Date
2026-05-27

AI Technical Summary

Technical Problem

Conventional separation techniques, such as distillation, are ineffective in removing 3,3,3-trifluoropropene (HFO-1243zf) from 1,1-difluoropropene (HFO-1252zc) due to their similar boiling points, and chemical processes to produce HFO-1252zc often yield l-fluoropropene (HFO-1261ze) as a minor co-product, which is difficult to fully separate.

Method used

A process involving a solution of a metal-hydride catalyst, such as copper hydride, silver hydride, or gold hydride, in a liquid hydrosilane, which selectively converts HFO-1243zf to HFO-1252zc, thereby increasing the HFO-1252zc content in the product stream and reducing HFO-1243zf to less than 0.1 mole percent.

Benefits of technology

The process achieves a selectivity of at least 98% or 99% in converting HFO-1243zf to HFO-1252zc, efficiently increasing the HFO-1252zc content in the product stream while minimizing the HFO-1243zf content.

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Abstract

Disclosed herein are a process to prepare and a composition for a solution of a metal-hydride catalyst that includes > 50% of a liquid hydrosilane that is both a solvent component for the metal-hydride catalyst and a reactant in a process to convert HFO-1243zf in a composition or product stream to HFO-1252zc.
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