Claims
- 1. A process for preparing 1,1,1,2-tetrafluoroethane which comprises reacting, in the gas phase, trichloroethylene with 1,1,1-trifluorochloroethane and hydrofluoric acid, operating with trichloroethylene/1,1,1-trifluorochloroethane molar ratios ranging from 5/95 to 50/50 and with HF/(trichloroethylene+1,1,1-trifluorochloroethane) molar ratios of at least 3/1 and in the presence of a catalyst consisting essentially of Cr.sub.2 O.sub.3 carried on AlF.sub.3.
- 2. The process according to claim 1, wherein the reaction is made to occur at a temperature ranging from 300.degree. to 400.degree. C.
- 3. The process according to claim 1, wherein the reaction is made to occur at a temperature ranging from 330.degree. to 380.degree. C.
- 4. The process according to claim 1, wherein it is operated with contact times among the reagents ranging from 1 to 50 seconds.
- 5. The process according to claim 1, wherein it is operated with contact times among the reagents ranging from 5 to 20 seconds.
- 6. The process according to claim 1, wherein the AlF.sub.3 exhibits a surface area ranging from 25 to 30 m.sup.2 /g.
- 7. The process according to claim 1, carried out continuously.
- 8. The process of claim 1 wherein the AlF.sub.3 comprises the gamma and/or beta form.
- 9. The process of claim 8 wherein the AlF.sub.3 further comprises the delta form.
- 10. The process of claim 1 wherein the AlF.sub.3 comprises principally the gamma form.
Priority Claims (1)
Number |
Date |
Country |
Kind |
21159A/89 |
Jul 1989 |
ITX |
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Parent Case Info
This is a continuation of U.S. application Ser. No. 08/191,765, filed Feb. 3, 1994, (now abandoned) which is a continuation of U.S. application Ser. No. 07/928,188, filed Aug. 14, 1992 (now abandoned), which is a continuation of U.S. application Ser. No. 07/811,920, filed Dec. 23, 1991 (now abandoned), which is a continuation of U.S. application Ser. No. 07/550,559, filed Jul. 10, 1990 (now abandoned) .
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Continuations (4)
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Number |
Date |
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191765 |
Feb 1994 |
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Parent |
928188 |
Aug 1992 |
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Parent |
811920 |
Dec 1991 |
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Parent |
550559 |
Jul 1990 |
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