Azeotrope compositions of octafluorocyclobutane and uses thereof
AssigneeE.I. du Pont de Nemours and Company
InventorsVelliyur Nott Mallikarjuna Rao, Jeffrey P. Knapp
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Abstract
The present disclosure related to azeotrope and near-azeotrope compositions comprising PFC-C318 and HFC-236cb. The present disclosure further relates to processes for removing PFC-C318 from HFC-236cb. And the present disclosure further relates to azeotrope and near azeotrope compositions comprising hydrogen fluoride and PFC-C318.
Claims10
An azeotrope or near-azeotrope composition comprising from about 62.3 mole percent to about 71.3 mole percent PFC-C318 and from about 37.7 mole percent to about 28.7 mole percent HFC-236cb.
A process for the removal of PFC-C318 from a mixture comprising HFC-236cb and PFC-C318, said process comprising:
- a) subjecting said mixture comprising HFC-236cb and PFC-C318 to a distillation step;
- and
- b) removing as distillate a composition comprising an azeotrope or near-azeotrope composition comprising from about 62.3 mole percent to about 71.3 mole percent HFC-236cb and from about 37.7 mole percent to about 28.7 mole percent PFC-C318.
A process for the separation of PFC-C318 from a mixture comprising HFC-236cb and PFC-C318, said process comprising:
- a) subjecting said mixture to a first distillation step in which a composition enriched in either (i) PFC-C318 or (ii) HFC-236cb is removed as a first distillate composition comprising an azeotrope or near-azeotrope composition comprising from about 62.3 mole percent to about 71.3 mole percent HFC-236cb and from about 37.7 mole percent to about 28.7 mole percent PFC-C318, with a first bottoms composition being enriched in the other of said components (i) or (ii);
- and
- b) subjecting said first distillate composition to a second distillation step conducted at a different pressure than the first distillation step in which the component enriched as first bottoms composition in (a) is removed in a second distillate composition with a second bottoms composition enriched in the same component which was enriched in the first distillate composition.
An azeotrope or near-azeotrope composition comprising from about 39.5 mole percent to about 59.5 mole percent hydrogen fluoride and from about 60.5 mole percent to about 40.5 mole percent PFC-C318.
Dependencies are inferred from the claim text.