EP 0724553 A1 19960807 - PROCESS FOR MANUFACTURE OF HIGH PURITY 1,1-DICHLOROTETRAFLUOROETHANE
Title (en)
PROCESS FOR MANUFACTURE OF HIGH PURITY 1,1-DICHLOROTETRAFLUOROETHANE
Title (de)
VERFAHREN ZUR HERSTELLUNG VON NOCHREINEM 1,1-DICHLOR-TETRAFLUORETHAN
Title (fr)
PROCEDE DE PRODUCTION DE 1,1-DICHLOROTETRAFLUOROETHANE DE HAUTE PURETE
Publication
Application
Priority
- US 9409531 W 19940901
- US 14685393 A 19931101
Abstract (en)
[origin: WO9512564A1] A process for producing CCl2FCF3 substantially free of CC1F2CC1F2 is disclosed. The process includes contacting a feed mixture consisting essentially of C2Cl3F3 where the ratio of CCl2FCClF2 to CCl3CF3 is at least about 1:9 with an isomerization catalyst to produce an isomerization product wherein there is less than about 50,000 parts by weight CCl2FCC1F2 per million parts CCl3CF3. The isomerization product is contacted with HF in the vapor phase in the presence of a fluorination catalyst comprising trivalent chromium at an elevated temperature below 400 DEG C selected to provide a fluorination product containing C2Cl2F4 and C2Cl3F3 wherein there is less than 10,000 parts by weight CClF2CClF2 per million parts by weight CCl2FCF3 and wherein the parts by weight CCl2FCC1F2 per million parts CCl3CF3 is greater than the parts by weight CC12FCC1F2 per million parts CCl3CF3 in the isomerization product. The C2Cl2F4 from the fluorination product is recovered; and C2Cl3F3 from the fluorination product is recycled to the isomerization step along with an additional amount of CCl2FCC1F2 which is at least equal to the amount of C2Cl2F4 recovered from the fluorination product and is sufficient to provide the desired feed mixture ratio of CCl2FCC1F2 to CCl3CF3.
IPC 1-7
IPC 8 full level
B01J 23/26 (2006.01); C07B 61/00 (2006.01); C07C 17/20 (2006.01); C07C 17/358 (2006.01); C07C 19/12 (2006.01)
CPC (source: EP)
C07C 17/206 (2013.01); C07C 17/358 (2013.01); C07C 19/12 (2013.01); Y02P 20/582 (2015.11)
Citation (search report)
See references of WO 9512564A1
Designated contracting state (EPC)
DE ES FR GB IT NL
DOCDB simple family (publication)
WO 9512564 A1 19950511; EP 0724553 A1 19960807; JP H09505566 A 19970603
DOCDB simple family (application)
US 9409531 W 19940901; EP 94926570 A 19940901; JP 51319494 A 19940901