Purification of difluoromethane by extractive distillation

Details Purification of difluoromethane by extractive distillation Purification of difluoromethane by extractive distillation

2008-05-13

2008-05-13

Manoharan, Virginia (Department: 1764)

Distillation: processes, separatory

Adding material to distilland except water or steam per se

Organic compound

C203S062000, C203S063000, C203S067000, C203S068000, C203S069000, C203S070000, C570S178000

Reexamination Certificate

active

09485559

ABSTRACT:
The present invention provides extractive distillation processes for removing difluoromethane (HFC-32) from a mixture comprising HFC-32 and at least one of chlorodifluoromethane (CFC-12), 1,1,1-trifluoroethane (HFC-143a), chloropentafluoroethane (CFC-115), and pentafluoroethane (HFC-125) using hydrocarbon, chlorocarbon, and oxygen-containing extractive agents.

REFERENCES:
patent: 5470442 (1995-11-01), Mahler et al.
patent: 5534151 (1996-07-01), Lee
patent: 5723429 (1998-03-01), Mahler et al.
patent: 5785822 (1998-07-01), Cerri et al.
patent: 5830325 (1998-11-01), Mahler et al.
patent: 6156161 (2000-12-01), Miller
patent: 2003/0010618 (2003-01-01), Clemmer

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