Patent number: 11084768
Abstract: A process for the production of 2,3,3,3-tetrafluoropropene including the stages: i) in a first reactor, bringing a stream A including 2-chloro-3,3,3-trifluoropropene into contact with hydrofluoric acid in the gas phase in the presence of a catalyst in order to produce a stream B including 2,3,3,3-tetrafluoropropene, HCl, HF and unreacted 2-chloro-3,3,3-trifluoropropene; and ii) in a second reactor, bringing hydrofluoric acid into contact, in the gas phase in the presence or not of a catalyst, with a stream including at least one chlorinated compound selected from the group of 1,1,1,2,3-pentachloropropane, 2,3-dichloro-1,1,1-trifluoropropane, 2,3,3,3-tetrachloropropene and 1,1,2,3-tetrachloropropene, in order to produce a stream C including 2-chloro-3,3,3-trifluoropropene, wherein the stream B obtained in stage i) feeds the second reactor used for stage ii); and wherein the electrical conductivity of the stream A provided in stage i) is less than 15 mS/cm.
Type:
Grant
Filed:
March 4, 2019
Date of Patent:
August 10, 2021
Assignee:
ARKEMA FRANCE
Inventors:
Laurent Wendlinger, Dominique Deur-Bert, Anne Pigamo
Publication number: 20210214220
Abstract: The present invention concerns a method for preparing a compound of the following formula (III): R2—(SO2)—NM—(SO2)—F (III) in which R2 represents one of the following radicals: F, CF3, CHF2, CH2F, C2HF4, C2H2F3, C2H3F2, C2F, C3F7, C3H4F3, C3HF6, C4F9, C4H2F7, C4H4F, CF11, C6F13, C7F1, C8F17 or C9F19. M represents a monovalent or divalent cation; the method comprising: —a step b) of fluorinating a compound of the following formula (I): R1—(SO2)—NH—(SO2)—Cl (I) in which R represents one of the following radicals: Cl, F, CF3, CHF2, CH2F, C2HF4, C2H2F3, C2H3F2, C2F, C3F7, C3H4F3, C3HF6, C4F9, C4H2F7, C4H4F, CF11, C6F13, C7F15, C8F17 or C9F19, R preferably representing Cl; with at least one fluorinating agent; 2—a step c) of distilling the composition obtained in step b).
Type:
Application
Filed:
May 28, 2019
Publication date:
July 15, 2021
Applicant:
Arkema France
Inventors:
Grégory SCHMIDT, Dominique DEUR-BERT, Rémy TEISSIER