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publicationDate 2008-05-13-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber US-7371309-B2
titleOfInvention Purification of difluoromethane by extractive distillation
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.
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