EP 1062194 A1 20001227 - PROCESSES FOR PURIFYING PERFLUOROCYCLOBUTANE
Title (en)
PROCESSES FOR PURIFYING PERFLUOROCYCLOBUTANE
Title (de)
VERFAHREN ZUR REINIGUNG VON PERFLUORCYCLOBUTAN
Title (fr)
PROCEDES DE PURIFICATION DE PERFLUOROCYCLOBUTANE
Publication
Application
Priority
- US 9904818 W 19990305
- US 7692398 P 19980305
Abstract (en)
[origin: WO9944973A1] Disclosed is PFC-C318 containing less than 10 parts-per-million-molar of halogenated impurities and processes for producing such substantially-pure PFC-C318. In operating these processes, various PFC-C318-containing azeotropes and azeotrope-like compositions have been discovered and are of utility. These compositions comprise: perfluorocyclobutane (PFC-C318) and 2-chloro-1,1,1,2-tetrafluoroethane (HCFC-124); perfluorocyclobutane (PFC-C318) and 1,1,2,2-tetrafluoroethane (HFC-134); perfluorocyclobutane (PFC-C318) and 1,1,1,2-tetrafluoroethane (HFC-134a); and perfluorocyclobutane (PFC-C318) and 1,1-difluoroethane (HFC-152a). The processes of the present invention for producing substantially-pure PFC-C318 comprise: a) azeotropic distillation processes for separating PFC-C318 from halogenated impurities, and b) extractive distillation processes for separating PFC-C318 from halogenated impurities by employing entraining agents selected from ethers, ketones, alcohols, hydrocarbons, and hydrochlorocarbons.
IPC 1-7
IPC 8 full level
C07C 17/383 (2006.01); C07C 17/386 (2006.01); C07C 19/08 (2006.01); C07C 19/12 (2006.01); C07C 23/06 (2006.01)
CPC (source: EP KR)
C07C 17/383 (2013.01 - EP); C07C 17/386 (2013.01 - EP KR); C07C 19/08 (2013.01 - EP); C07C 19/12 (2013.01 - EP); C07C 23/06 (2013.01 - EP)
Citation (search report)
See references of WO 9944973A1
Designated contracting state (EPC)
DE ES FR GB IT NL
DOCDB simple family (publication)
WO 9944973 A1 19990910; CN 1183072 C 20050105; CN 1292773 A 20010425; EP 1062194 A1 20001227; JP 2002505311 A 20020219; KR 20010041583 A 20010525
DOCDB simple family (application)
US 9904818 W 19990305; CN 99803646 A 19990305; EP 99911129 A 19990305; JP 2000534522 A 19990305; KR 20007009773 A 20000904