Purification of 1,1,1,2-tetrafluoroethane
AssigneeImperial Chemical Industries PLC
InventorsCharles J. Shields, Adrian S. Swindells
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Abstract
A process for the removal of 1-chloro-2,2-difluoroethylene from 1,1,1,2-tetrafluoroethane by contacting the mixture with a zeolite having a mean pore size in the range of 3.5 .ANG. and 4.8 .ANG. and having potassium as counter cation. The zeolite having potassium as counter-cation may be produced by cation-exchange with a commercially available zeolite, for example AW-500.
Claims10
A process for the removal of 1-chloro-2,2-difluoroethylene from 1,1,1,2-tetrafluoroethane which comprises contacting 1,1,1,2-tetrafluoroethane containing 1-chloro-2,2-difluoroethylene with a zeolite having a mean pore size in the range of 3.5 .ANG. to 4.8 .ANG. and having potassium as the predominant counter cation.
A process for the removal of 1-chloro-2,2-difluoroethylene from 1,1,1,2-tetrafluoroethane by contacting 1,1,1,2-tetrafluoroethane containing 1-chloro-2,2-difluoroethylene with a zeolite having a mean pore size in the range of about 3.5 .ANG. to about 4.8 .ANG. and having potassium as a counter cation wherein the zeolite is produced by potassium-cation exchange with a starting zeolite comprising at least one of errionite, offrotite and chabazite.
Dependencies are inferred from the claim text.