Global Patent Index - EP 1003699 B9

EP 1003699 B9 20040107 - PURIFICATION OF DIFLUOROMETHANE BY EXTRACTIVE DISTILLATION

Title (en)

PURIFICATION OF DIFLUOROMETHANE BY EXTRACTIVE DISTILLATION

Title (de)

REINIGUNG VON DIFLUORMETHAN DURCH EXTRAKTIVDESTILLATION

Title (fr)

PURIFICATION DU DIFLUOROMETHANE PAR LA DISTILLATION EXTRACTIVE

Publication

EP 1003699 B9 20040107 (EN)

Application

EP 98939352 A 19980812

Priority

  • US 9816689 W 19980812
  • US 5550297 P 19970812

Abstract (en)

[origin: WO9907660A1] 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.

IPC 1-7

C07C 17/386; C07C 19/08

IPC 8 full level

B01D 3/32 (2006.01); B01D 3/40 (2006.01); C07C 17/386 (2006.01); C07C 19/08 (2006.01)

CPC (source: EP)

B01D 3/322 (2013.01); B01D 3/40 (2013.01); C07C 17/386 (2013.01)

C-Set (source: EP)

C07C 17/386 + C07C 19/08

Designated contracting state (EPC)

DE FR GB IT NL

DOCDB simple family (publication)

WO 9907660 A1 19990218; DE 69819163 D1 20031127; DE 69819163 T2 20040722; EP 1003699 A1 20000531; EP 1003699 B1 20031022; EP 1003699 B9 20040107; JP 2001513520 A 20010904; US 2003116422 A1 20030626; US 7371309 B2 20080513

DOCDB simple family (application)

US 9816689 W 19980812; DE 69819163 T 19980812; EP 98939352 A 19980812; JP 2000507197 A 19980812; US 48555900 A 20000211