Process for the preparation of 2,3,3,3-tetrafluoropropene
AssigneeMexichem Amanco Holdings S.A. De C.V.
InventorsJohn W. Smith, Claire McGuinness, Andrew P. Sharratt, Andrew M. Taylor
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Abstract
The invention provides a process for the preparation of 1234yf comprising (a) contacting 1,1,2,3,3,3-hexafluoropropene (1216) with hydrogen in the presence of a hydrogenation catalyst to produce 1,1,2,3,3,3-hexafluoropropane (236ea); (b) dehydrofluorinating 236ea to produce 1,2,3,3,3-pentafluoropropene (1225ye); (c) contacting 1225ye with hydrogen in the presence of a hydrogenation catalyst to produce 1,2,3,3,3-pentafluoropropane (245eb); and (d) dehydrofluorinating 245eb to produce 1234yf.
Claims20
A process for the preparation of 2,3,3,3-tetrafluoropropene (1234yf), the process comprising:
- (a) contacting 1,1,2,3,3,3-hexafluoropropene (1216) with hydrogen in the presence of a hydrogenation catalyst to produce 1,1,2,3,3,3-hexafluoropropane (236ea);
- (b) dehydrofluorinating 236ea to produce 1,2,3,3,3-pentafluoropropene (1225ye);
- (c) contacting 1225ye with hydrogen in the presence of a hydrogenation catalyst to produce 1,2,3,3,3-pentafluoropropane (245eb);
- and
- (d) dehydrofluorinating 245eb to produce 1234yf,
- wherein steps (a) and/or (c) is carried out with a diluent gas stream that comprises a molar excess of about 42% to 380% of feedstock 1216 and/or a molar excess of about 51 to 410% of feedstock 1225ye, respectively.
Dependencies are inferred from the claim text.