Global Patent Index - EP 1062194 A1

EP 1062194 A1 2000-12-27 - 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

EP 1062194 A1 (EN)

Application

EP 99911129 A

Priority

  • US 9904818 W
  • US 7692398 P

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 (main, further and additional classification)

C07C 17/386; C07C 23/06

IPC 8 full level (invention and additional information)

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 (invention and additional information)

C07C 23/06 (2013.01); C07C 17/383 (2013.01); C07C 17/386 (2013.01); C07C 19/08 (2013.01); C07C 19/12 (2013.01)

Citation (search report)

See references of WO 9944973A1

Designated contracting state (EPC)

DE ES FR GB IT NL

EPO simple patent family

WO 9944973 A1 19990910; CN 1183072 C 20050105; CN 1292773 A 20010425; EP 1062194 A1 20001227; JP 2002505311 A 20020219

INPADOC legal status


2004-03-31 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20030821

2002-08-07 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20020624

2000-12-27 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000804

2000-12-27 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE ES FR GB IT NL