PURIFICATION OF DIFLUOROMETHANE

PROBLEM TO BE SOLVED: To provide a method for separating difluoromethane from an azeotropic mixture. SOLUTION: A method for separating difluoromethane from the mixture of difluoromethane and at least one impurity comprises: a step of extractively distilling said mixture using dichloromethane as the...

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Bibliographische Detailangaben
1. Verfasser:	CLEMMER PAUL G
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS CHEMISTRY GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS METALLURGY ORGANIC CHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS TRANSPORTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for separating difluoromethane from an azeotropic mixture. SOLUTION: A method for separating difluoromethane from the mixture of difluoromethane and at least one impurity comprises: a step of extractively distilling said mixture using dichloromethane as the extractive agent from a distillation column 10 to recover a product stream of difluoromethane having a concentration of said impurity lower than that of said mixture from an overhead stream 4; and a step of recycling a portion of sidestream 5 into a fluorination reactor. COPYRIGHT: (C)2007,JPO&INPIT