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1. WO1996011176 - METHOD OF SEPARATING PENTAFLUOROETHANE AND PROCESS FOR PRODUCING PENTAFLUOROETHANE BY UTILIZING SAID METHOD

Publication Number WO/1996/011176
Publication Date 18.04.1996
International Application No. PCT/JP1995/002048
International Filing Date 06.10.1995
Chapter 2 Demand Filed 22.04.1996
IPC
C07C 17/21 2006.01
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
CACYCLIC OR CARBOCYCLIC COMPOUNDS
17Preparation of halogenated hydrocarbons
093by replacement by halogens
20of halogen atoms by other halogen atoms
21with simultaneous increase of the number of halogen atoms
C07C 17/38 2006.01
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
CACYCLIC OR CARBOCYCLIC COMPOUNDS
17Preparation of halogenated hydrocarbons
38Separation; Purification; Stabilisation; Use of additives
CPC
C07C 17/21
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
CACYCLIC OR CARBOCYCLIC COMPOUNDS
17Preparation of halogenated hydrocarbons
093by replacement by halogens
20of halogen atoms by other halogen atoms
21with simultaneous increase of the number of halogen atoms
C07C 17/38
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
CACYCLIC OR CARBOCYCLIC COMPOUNDS
17Preparation of halogenated hydrocarbons
38Separation; Purification; Stabilisation; Use of additives
Applicants
  • DAIKIN INDUSTRIES, LTD. [JP]/[JP] (AllExceptUS)
  • HOMOTO, Yukio [JP]/[JP] (UsOnly)
  • SHIBANUMA, Takashi [JP]/[JP] (UsOnly)
  • NISHITSUJI, Masanobu [US]/[US] (UsOnly)
Inventors
  • HOMOTO, Yukio
  • SHIBANUMA, Takashi
  • NISHITSUJI, Masanobu
Agents
  • AOYAMA, Tamotsu
Priority Data
6/24390707.10.1994JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) METHOD OF SEPARATING PENTAFLUOROETHANE AND PROCESS FOR PRODUCING PENTAFLUOROETHANE BY UTILIZING SAID METHOD
(FR) PROCEDE PERMETTANT DE SEPARER DU PENTAFLUOROETHANE ET PROCEDE DE PREPARATION DE PENTAFLUOROETHANE A L'AIDE DUDIT PROCEDE DE SEPARATION
Abstract
(EN)
A method of separating pentafluoroethane (HFC-125) from the reaction mixture in the production of HFC-125 more efficiently and, in particular, in a more simplified manner, which method comprises the step of passing a gaseous mixture comprising perchloroethylene (PCE), HFC-125, hydrogen chloride (HC1) and hydrogen fluoride (HF) through the first condensation step to prepare the first vapor-phase portion, the step of passing the first portion through the second condensation step to prepare the second vapor-phase portion mainly comprising HFC-125 and HC1 and the second liquid-phase portion comprising the rest of the mixture, the step of leading the second liquid-phase portion to the distillation step to prepare a top fraction mainly comprising HFC-125 and HC1 and a bottom fraction substantially free from HFC-125 and HC1 and comprising the rest of the mixture, and the step of removing HC1 from the second vapor-phase portion and the top fraction to prepare HFC-125. The PCE concentration in the second liquid-phase portion is so controlled as not to cause liquid separation.
(FR)
L'invention concerne un procédé permettant de séparer du pentafluoroéthane (HFC-125) d'un mélange réactionnel dans une perspective de production plus rentable de HCF-125, de manière simplifiée. Ce procédé comprend différentes étapes: faire passer un mélange gazeux comprenant du tétrachloréthylène (PCE), du HCF-125, du chlorure d'hydrogène (HCl) et du fluorure d'hydrogène (HF) à travers un premier étage de condensation, afin de préparer une première portion en phase vapeur; faire passer la première portion à travers un second étage de condensation, afin de préparer la seconde portion en phase vapeur contenant principalement du HFC-125 et du HCl et la seconde portion en phase liquide contenant le reste du mélange; acheminer la seconde portion en phase liquide jusqu'à l'étage de distillation, afin de préparer une fraction de tête comprenant principalement du HCF-125 et du HCl et une fraction de queue sensiblement exempte de HFC-125 et de HCl et comprenant le reste du mélange; et séparer le HCl de la seconde portion en phase vapeur et la fraction de tête pour préparer le HCF-125. La concentration en PCE dans le seconde portion en phase liquide est surveillée de manière à ce qu'elle n'entraîne pas de séparation de liquide.
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