Back to results
US 12,116,332 B2Granted
High purity HFO-E-1,3,3,3-tetrafluoropropene (trans-HFO-1234ze) and methods for producing same
AssigneeHoneywell International Inc.
InventorsHaiyou Wang, Gustavo Cerri, Mitchel Cohn, Selma Bektesevic
Life of this patent
Estimating the term…
Abstract
The present disclosure provides high purity E-1,3,3,3-tetrafluoropropene (HFO-1234ze). More specifically, the present disclosure provides E-1,3,3,3-tetrafluoropropene (HFO-234ze) in at least 99.99% purity, containing less than 3 ppm 1,1,3,3,3-pentafluoropropene (HFO-1225zc). The present disclosure further provides a method of making high purity E-1,3,3,3-tetrafluoropropene (HFO-1234ze).
Claims17
A method of making HFO-E-1,3,3,3-tetrafluoropropene (trans-HFO-1234ze), the method comprising:
- (a) purifying a stream of 1,1,1,3,3-pentafluoropropane (HFC-245fa);
- (b) dehydrofluorinating the purified stream of 1,1,1,3,3-pentafluoropropane (HFC-245fa) to thereby produce a result comprising HFO-Z-1,3,3,3-tetrafluoropropene (cis-HFO-1234ze), HFO-E-1,3,3,3-tetrafluoropropene (trans-HFO-1234ze), and hydrogen fluoride;
- (c) isomerizing at least a portion of the HFO-Z-1,3,3,3-tetrafluoropropene (cis-HFO-1234ze) into HFO-E-1,3,3,3-tetrafluoropropene (trans-HFO-1234ze);
- (d) passing the HFO-E-1,3,3,3-tetrafluoropropene (trans-HFO-1234ze) through a water scrubber, a caustic scrubber and a sulfuric acid drier;
- (e) passing the HFO-E-1,3,3,3-tetrafluoropropene (trans-HFO-1234ze) through at least one distillation column;
- and
- (f) recovering purified HFO-E-1,3,3,3-tetrafluoropropene (trans-HFO-1234ze) of at least 99.99% purity and including 5 ppm or less 1,1,3,3,3-pentafluoropropene (HFO-1225zc).
4 more elements
A method of making HFO-E-1,3,3,3-tetrafluoropropene (trans-HFO-1234ze), the method comprising:
- (a) purifying a stream of 1,1,1,3,3-pentafluoropropane (HFC-245fa) by passing through one or more distillation columns to produce a purified stream of 1,1,1,3,3-pentafluoropropane (HFC-245fa) having a content of at least one of 1-chloro-1,1,3,3,3-pentafluoropropane (HFC-235fa), 2-chloro-1,1,3,3,3-pentafluoropropane (HFC-235da), 1,1,1,3,3,3-hexafluoropropane (HFC-236fa), and 1,1,2,3,3,3-hexafluoropropane (HFC-236ea) of about 50 ppm or less;
- (b) dehydrofluorinating the purified stream of 1,1,1,3,3-pentafluoropropane (HFC-245fa) to thereby produce a result comprising HFO-Z-1,3,3,3-tetrafluoropropene (cis-HFO-1234ze), HFO-E-1,3,3,3-tetrafluoropropene (trans-HFO-1234ze), and hydrogen fluoride;
- (c) isomerizing at least a portion of the HFO-Z-1,3,3,3-tetrafluoropropene (cis-HFO-1234ze) into HFO-E-1,3,3,3-tetrafluoropropene (trans-HFO-1234ze);
- (d) passing the HFO-E-1,3,3,3-tetrafluoropropene (trans-HFO-1234ze) through at least one distillation column;
- and
- (e) recovering purified HFO-E-1,3,3,3-tetrafluoropropene (trans-HFO-1234ze) including 5 ppm or less 1,1,3,3,3-pentafluoropropene (HFO-1225zc).
3 more elements
Dependencies are inferred from the claim text.