Process for purifying 1,1,1-trifluoro-2-fluoroethane
AssigneeAusimont S.p.A.
InventorsAntonio Masiero, Paolo Cuzzato, Letanzio Bragante
Life of this patent
Estimating the term…
Abstract
1,1,1-trifluoro-2-fluoroethane (CFC 134a) is purified from 1,1-difluoro-2-chloroethylene (CFC 1122) by reacting a mixture comprising said compounds with hydrofluoric acid, at temperatures from 200.degree. C. to 450.degree. C., in the presence of chrome oxide (Cr.sub.2 O.sub.3) in substantially crystalline form.
Claims3
A process for purifying a mixture of 1,1,1-trifluoro-2-fluoroethane and a 1,1-difluoro-2-chloro-ethylene impurity, said process comprising reacting, at temperatures ranging from 200.degree. to 450.degree. C., said mixture with hydrofluoric acid in the presence of a chrome oxide catalyst in the non-carried form, wherein:
- said chrome oxide catalyst being of a substantially crystalline structure such that at least 60% by weight of said chrome oxide catalyst is of a non-amorphous crystalline structure, and
- said chrome oxide catalyst having been prepared at a calcination temperature higher than 420.degree. C. and UD to about 900.degree. C.
Dependencies are inferred from the claim text.