EP0408005B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process for preparing 1,1,1,2-tetrafluoroethane
Assignee: Syensqo Specialty Polymers Italy SpA
•
Filing: 1990-07-11
•
Granted: 1994-03-02
•
Expires: 2010-07-11
Abstract
No abstract record available.
Inventors
- 👤 Paolo Cuzzato
- 👤 Antonio Masiero
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 14:31
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/093; C07C17/20; C07C17/202; C07C17/206; C07C19/00; C07C19/08; B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/26; B01J27/00; B01J27/06; B01J27/125; C07C17/21
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
74 words
Process for preparing 1,1,1,2-tetrafluoroethane, which comprises reacting, in the gas phase, trichloroethylene with 1,1,1-trifluorochloroethane and hydrofluoric acid, in molar ratios of trichloroethylene to 1,1,1-trifluorochloroethane of from 5/95 to 50/50 and in the presence of a catalyst comprising chromium trioxide supported on aluminium trifluoride, prepared by impregnating AlF₃ comprising gamma- and/or beta-AlF₃ with a solution of a soluble salt of trivalent chromium, drying, and activating the catalyst with air or nitrogen at 200 to 600°C.
Claim 2
Dependent Claim
19 words
Process according to claim 1, wherein the reaction is carried out at a temperature of from 300 to 400°C.
Claim 3
Dependent Claim
19 words
Process according to claim 1, wherein the reaction is carried out at a temperature of from 330 to 380°C.
Claim 4
Dependent Claim
23 words
Process according to any one of claims 1 to 3, wherein the contact time of the reagents ranges from 1 to 50 seconds.
Claim 5
Dependent Claim
23 words
Process according to any one of claims 1 to 4, wherein the contact time of the reagents ranges from 5 to 20 seconds.
Claim 6
Dependent Claim
25 words
Process according to any one of claims 1 to 5, wherein the aluminium trifluoride exhibits a specific surface area of from 25 to 30 m²/g.
Claim 7
Dependent Claim
15 words
Process according to any one of claims 1 to 6, which is carried out continuously.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.