Back to results
US 4,049,728 AGranted
Hydrofluorination process
AssigneePhillips Petroleum Company
InventorsWayne P. Kraus, Thomas Hutson, Jr.
Life of this patent
Estimating the term…
Abstract
Improved hydrofluorination process with minimum polymer and heavy oil formation comprising carrying out the hydrofluorination of olefins with HF in a paraffinic diluent followed by low pressure and low temperature fractional distillation. In a preferred embodiment, normal butane or normal pentane is used as a diluent in the hydrofluorination, and the entire process of hydrofluorination and recovery is carried out at temperatures below about 80.degree. F (26.7.degree. C).
Claims9
A process for the production of high purity alkyl fluorides with minimum polymer and heavy oil formation which comprises:
- a. hydrofluorinating an olefin with HF in a normal paraffin diluent wherein the normal paraffin contains from 3 to 6 carbon atoms under liquid phase hydrofluorination conditions and a temperature below about 80.degree. F. (26.7.degree. C.) to produce an effluent comprising alkyl fluoride, unreacted olefin, normal paraffin diluent, and HF;
- b. separating said effluent into an HF phase portion and a hydrocarbon phase portion;
- c. subjecting the hydrocarbon phase portion of said effluent to fractional distillation conditions at a pressure substantially below atmospheric and a temperature below about 80.degree. F. (26.7.degree. C.) which is sufficiently low to prevent polymer and heavy oil formation and to separate a first stream comprising alkyl fluoride and a second stream comprising unreacted olefin, and diluent;
- and
- d. recycling said stream containing unreacted olefin and diluent to step (a) for reuse in the process.
2 more elements
Dependencies are inferred from the claim text.