Back to results
US 2014/0235903 A1Published application
Process for producing 2,3,3,3-tetrafluoropropene
AssigneeHoneywell International Inc.
InventorsHaiyou Wang, Hsueh Sung Tung
Life of this patent
Estimating the term…
Abstract
The present invention relates, in part, to the discovery that the presence of impurities in a reactor for dehydrochlorinating HCFC-244bb to HFO-1234yf results in selectivity changeover from HFO-1234yf to HCFO-1233xf. By substantially removing such impurities, it is shown that the selectivity to HFO-1234yf via dehydrochlorination of HCFC-244bb is improved.
Claims24
A process for removing impurities from a reactor comprising an inner metal alloy surface such that the reactor is substantially free of impurities comprising the steps of:
- (a) purging the reactor with an inert gas;
- (b) optionally, oxidizing the impurities in the reactor by introducing an oxidizing agent into the reactor under conditions effective to oxidize the impurities;
- (c) reducing the impurities in the reactor by introducing a reducing agent into the reactor under conditions effective to reduce the impurities;
- (d) cooling the reactor to an ambient temperature while passing the reducing agent and/or inert gas through the reactor;
- and
- (e) maintaining a positive pressure in the reactor with the reducing agent and/or the inert gas.
3 more elements
(canceled)
(canceled)
A process for preparing 2,3,3,3-tetrafluoropropene comprising:
- (a) removing impurities from a reactor such that the reactor is substantially free of impurities comprising the steps of:
- (i) purging the reactor with an inert gas;
- (ii) optionally, oxidizing the impurities in the reactor by passing an oxidizing agent through the reactor at a temperature that is sufficiently high to oxidize the impurities;
- (iii) reducing the impurities in the reactor by passing a reducing agent through the reactor at a temperature that is sufficiently high to reduce the impurities;
- (iv) cooling the reactor to an ambient temperature while passing the reducing agent and/or inert gas through the reactor;
- and
- (v) maintaining a positive pressure in the reactor with the reducing agent and/or the inert gas;
- (b) providing a starting composition comprising 2-chloro-1,1,1,2-tetrafluoropropane in the reactor;
- and
- (c) contacting the starting composition in the reactor under conditions effective to produce a final composition comprising 2,3,3,3-tetrafluoropropene.
7 more elements
Dependencies are inferred from the claim text.