Mexichem Amanco Holding S.a. De C.v.

Mexichem Amanco Holdings S.a. De C.v.

Mexichem Amanco S.a. De C.v.

John W Smith

Andrew Paul Sharratt

Claire McGuiness

Andrew M Taylor

Claire McGuinness

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.

Process for the preparation of 2,3,3,3-tetrafluoropropene

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 1225 ye 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).

Process for the preparation of 2, 3, 3, 3-tetrafluoropropene

The invention provides a process for the preparation of 2,3,3,3-tetrafluoropropene (1234yf) comprising (a) contacting 1,1,1-trifluoro-2,3-difluoropropane (243db) with hydrogen fluoride (HF) in the presence of a zinc/chromia catalyst to produce a compound having the formula CFCHFCHX, wherein X is Cl or F, and (b) dehydrohalogenating the compound of formula CFCHFCHX to produce 1234yf.

Process for the preparation of 2,3,3,3,-tetrafluoropropene (R-1234yf)

The invention provides a process for preparing 1,1,1-trifluoro-2,3-dichloropropane (243db), which process comprises contacting 3,3,3-trifluoropropene (1243zf) with chlorine in the presence of a catalyst, wherein the catalyst comprises activated carbon, alumina and/or an oxide of a transition metal.

Process for the production of chlorinated and fluorinated alkanes and alkenes in the presence of a catalyst

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The present invention provides a process for its preparation comprising (a) converting 1,1,1-trifluoro-2,3-dichloropropane (243db) to 3,3,3-trifluoro-2-chloro-prop-1-ene (CFCCI&#x2550;CH) in the presence of a first catalyst in a first reactor, (b) contacting CFCCI&#x2550;CHwith a fluorinating agent in the presence of a second catalyst in a second reactor to produce a compound of formula CFCFXCH, wherein X&#x2550;Cl or F, and (c) dehydrohalogenating the compound of formula CFCFXCHto produce 2,3,3,3-tetrafluoropropene (1234yf).

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Cheshire, United Kingdom

John W Smith