Back to results
US 5,396,000 AGranted
Process for the manufacture of 1,1,1,2,3,-pentafluoropropane
AssigneeE. I. Du Pont de Nemours and Company
InventorsMario J. Nappa, V. N. Mallikarjuna Rao
Life of this patent
Estimating the term…
Abstract
A process is disclosed for producing CF.sub.3 CHFCH.sub.2 F using vapor phase catalytic dehydrohalogenation to produce CF.sub.3 CF.dbd.CHF and HF, followed by vapor phase catalytic hydrogenation of CF.sub.3 CF.dbd.CHF in the presence of HF.
Claims15
A process for producing CF.sub.3 CHFCH.sub.2 F comprising the steps of:
- dehydrohalogenating CF.sub.3 CHFCHF.sub.2 at an elevated temperature in the vapor phase over a catalyst selected from the group consisting of aluminum fluoride, fluorided alumina, metal on aluminum fluoride, metal on fluorided alumina and mixtures thereof, the metal of said metal aluminum fluoride and metal on fluorided alumina being selected from the group consisting of chromium, magnesium, Group VIIB metals, Group IIIB metals and zinc, to produce a product containing CF.sub.3 CF.dbd.CHF and HF;
- adding hydrogen, HF and said CF.sub.3 CF.dbd.CHF to a reaction vessel containing a hydrogenation catalyst;
- and
- reacting said CF.sub.3 CF.dbd.CHF in the vapor phase with hydrogen over said hydrogenation catalyst in the presence of HF, to produce CF.sub.3 CHFCH.sub.2 F.
1 more element
A process for producing CF.sub.3 CHFCH.sub.2 F comprising the steps of:
- dehydrohalogenating CF.sub.3 CHFCHF.sub.2 at an elevated temperature in the vapor phase over a catalyst selected from the group consisting of aluminum fluoride, fluorided alumina, metal on aluminum fluoride, metal on fluorided alumina and mixtures thereof, the metal of said metal on aluminum fluoride and metal on fluorided alumina being selected from the group consisting of chromium, magnesium, Group VIIB metals, Group IIIB metals and zinc, to produce a product containing CF.sub.3 CF.dbd.CHF and HF;
- adding hydrogen, HF and said CF.sub.3 CF.dbd.CHF to a reaction vessel containing a hydrogenation catalyst containing a Group VIII metal or rhenium;
- and
- reacting said CF.sub.3 CF.dbd.CHF in the vapor phase with hydrogen over said hydrogenation catalyst in the presence of HF, to produce CF.sub.3 CHFCH.sub.2 F.
1 more element
A process for producing CF.sub.3 CHFCH.sub.2 F comprising the steps of:
- dehydrohalogenating CF.sub.3 CHFCHF.sub.2 at an elevated temperature in the vapor phase over a catalyst selected from the group consisting of aluminum fluoride, fluorided alumina, metal on aluminum fluoride, metal on fluorided alumina and mixtures thereof, the metal of said metal on aluminum fluoride and metal on fluorided alumina being selected from the group consisting of chromium, magnesium, Group VIIB metals, Group IIIB metals and zinc, to produce a product containing CF.sub.3 CF.dbd.CHF and HF;
- adding hydrogen, HF and said CF.sub.3 CF.dbd.CHF to a reaction vessel containing a hydrogenation catalyst;
- and
- reacting said CF.sub.3 CF.dbd.CHF in the vapor phase with hydrogen over said hydrogenation catalyst in the presence of HF which is approximately stoichiometric with the CF.sub.3 CF.dbd.CHF reacted.
1 more element
Dependencies are inferred from the claim text.