Staged fluorination process and reactor system
AssigneeHoneywell International Inc.
InventorsYuon Chiu, Haluk Kopkalli, Robert A. Smith, Daniel C. Merkel
Life of this patent
Estimating the term…
Abstract
The invention relates to a process to produce 244bb from 1233xf in multiple reaction zones whereby the 1233xf starting material is at least 95% converted to 244bb and by-product such as 245cb forms in amounts less than about 2%.
Claims17
A process to prepare 2-chloro-1,1,1,2-tetrafluorpropane (244bb) comprising contacting 2-chloro-3,3,3,-trifluoropropene (1233xf) with HF in the presence of a fluorination catalyst in multiple reaction zones under conditions effective to produce a composition that comprises 244bb and less than about 2% by weight 1,1,1,2,2-pentafluoropropane (245cb).
A process to prepare 2-chloro-1,1,1,2-tetrafluoropropane (244bb) comprising:
- a) contacting, in a first reaction zone, feed 2-chloro-3,3,3,-trifluoropropene (1233xf) with HF and first fluorination catalyst under conditions effective to produce a first composition comprising unreacted 1233xf, a first amount of 2-chloro-1,1,1,2-tetrafluoropropane (244bb), and a first amount of 1,1,1,2,2-pentafluoropropane (245cb);
- b) contacting, in a second reaction zone, the first composition with a second fluorination catalyst under conditions to produce a second composition, wherein the second composition comprises 244bb, and less than about 5% 1233xf by weight relative to the amount of feed 1233xf, and less than about 2% by weight 245cb.
A process to prepare 2,3,3,3-tetrafluoropropene (1234y0 comprising:
- a) providing a starting composition comprising at least one compound having a structure selected from Formula I, II and II:
- CX2═CCl—CH2X (Formula I)
- CX3—CCl═CH2 (Formula II)
- CX3—CHCl—CH2X (Formula III)
- wherein X is independently selected from F, Cl, Br and I, provided that at least one of X is not F;
- b) contacting said starting composition with HF under conditions effective to produce a first intermediate composition comprising 2-chloro-3,3,3-trifluoropropene (1233xf);
- c) contacting said first intermediate composition comprising 1233xf with HF in the presence of a fluorination catalyst in multiple reaction zones under conditions effective to produce a second intermediate composition comprising 244bb and less than about 2% by weight 1,1,1,2,2-pentafluoropropane (245cb);
- and
- d) dehydrochlorinating at least a portion of said 244bb to produce a reaction product comprising 1234yf.
Dependencies are inferred from the claim text.