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1. WO1991015445 - REGENERATION DE ZEOLITES UTILISEES DANS LA PURIFICATION DE 1,1,1-2-TETRAFLUOROETHANE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS :
1. A method for regenerating zeolites or carbon molecular sieves used for removing 2-chloro-1,1-difluoroethylene (R1122) from 1,1,1,2-tetrafluoroethane (R134a) comprising:
(a) removing R134a by stripping the zeolite or carbon molecular sieve with an inert gas at a temperature of about 0º to 60ºC and a pressure not higher than about 300 kPa;
(b) separating and recovering R134a from the inert gas of (a);
(c) removing R1122 from said zeolite by passing an inert gas over said zeolite or carbon molecular sieve at a temperature of about 150° to 300ºC and a pressure no higher than about 300 kPa.
2. The process of Claim 1 wherein said Inert gas of (a) 1s at least one member of the group consisting of nitrogen, argon, helium, carbon dioxide and low boiling fluorocarbons.
3. The process of Claim 1 wherein said inert gas of (a) is air.
4. The process of Claim 1 wherein said inert gas of (c) is at least one member of the group consisting of nitrogen, argon, helium, carbon dioxide and low boiling fluorocarbons.
5. The process of Claim 1 wherein said inert gas of (c) is air.
6. The process of Claim 1 wherein the pressure is no higher than about 100 kPa.
7. The process of Claim 1 wherein said zeolite is calcium chabazite.
8. A process for purification of 1,1,1,2-tetrafluorotthant (R134a) by removing 2-chloro-1,1-diflυoroethylene (R1122) by contacting said R134a with a zeolite or carbon molecular sieve wherein the Improvement comprises regenerating said zeolite by a sequence of steps comprising: (a) removing R134a by stripping the zeolite or carbon molecular sieve with an inert gas at a temperature of 0º to 60ºC and a pressure of no higher than about 300 kPa;
(b) separating from the inert gas of (a) the R-134a and returning the separated R134a to the purification process;
(c) removing R1122 from said zeolite by passing an inert gas over said zeolite or carbon molecular sieve at a temperature of about 150º to 300°C and a pressure of less than about 300 kPa; and,
(d) di sposing of the R1122.