Alliedsignal Inc.

G V Madhavan

Michael Van Der Puy

Alagappan Thenappan

Hsueh Sung Tung

Richard E Eibeck

Timothy R Demmin

Lois A Ellis

This invention is related to the preparation of hydrofluorocarbons (HFCs). Specifically, it relates to the manufacture of 1,1,1,3,3-pentafluoropropane, CF.sub.3 CH.sub.2 CF.sub.2 H (HFC-245fa) by the steps comprising (1) the formation of CCl.sub.3 CH.sub.2 CCl.sub.3 by the reaction of CCl.sub.4 with vinylidene chloride; (2) the conversion of CCl.sub.3 CH.sub.2 CCl.sub.3 to CF.sub.3 CH.sub.2 CF.sub.2 Cl by reaction with HF in the presence of a fluorination catalyst, selected from TiCl.sub.4, SnCl.sub.4 or mixtures thereof; and (3) reduction of CF.sub.3 CH.sub.2 CF.sub.2 Cl to CF.sub.3l CH.sub.2 CF.sub.2 H.

Process for the preparation of 1,1,1,3,3-pentafluoropropane

The invention relates to a cost effective and convenient process for the manufacture of fluorinated olefins of the formula RCF.sub.2 CH=CH.sub.2 where R is C.sub.x Cl.sub.y F.sub.z and y+z=2.times.+1. The invention is also directed to a lo practical process for converting these olefins to hydrofluorocarbons via the catalyzed fluorination with hydrogen fluoride. Hydrofluorocarbons produced via this process have application as solvents among other uses.

Processes for the preparation of fluorinated olefins and

The invention relates to a cost effective and convenient process for the manufacture of fluorinated olefins of the formula RCF.sub.2 CH=CH.sub.2 where R is C.sub.x Cl.sub.y F.sub.z and y+z=2x+1. The invention is also directed to a practical process for converting these olefins to hydrofluorocarbons via the catalyzed fluorination with hydrogen fluoride. Hydrofluorocarbons produced via this process have application as solvents among other uses.

A process for the preparation of compounds of the formula, F(CF.sub.2).sub.a CC1.sub.2 CC1.sub.2 (CF.sub.2).sub.b F where a and b are the same or different and are each an integer .gtoreq.1 (including the novel compound CF.sub.3 CF.sub.2 CC1.sub.2 CC1.sub.2 CF.sub.2 CF.sub.3), which comprises chlorination in the presence of irradiation, of at least one compound of the formula, F(CF.sub.2).sub.n CH.sub.x C1.sub.3-x where n is an integer .gtoreq.1 and x is an integer .ltoreq.3. There is also disclosed a process for utilizing the F(CF.sub.2).sub.a CC1.sub.2 CC1.sub.2 (CF.sub.2).sub.b F compounds to produce F(CF.sub.2).sub.a CH.sub.2 CH.sub.2 (CF.sub.2).sub.b F.sub.3 compounds which comprises contacting hydrogen and the F(CF.sub.2).sub.a CC1.sub.2 CC1.sub.2 (CF.sub.2).sub.b F compounds in the presence of a catalysis which includes at least one Group VIII transition metal. A further aspect of the invention is a novel group of compounds, F(CF.sub.2).sub.a CC1.sub.2 CC1.sub.2 (CF.sub.2).sub.b F, wherein a and b are the same or different and are each an integer from 2 to 10, particularly 3,3,4,4-tetrachloroperfluorohexane (i.e., CF.sub.3 CF.sub.2 CC1.sub.2 CC1.sub.2 CF.sub.2 CF.sub.3), whose corresponding hydrofluorocarbons can be used as cleaning solvents.

Hydrochlorofluorocarbons and hydrofluorocarbons and methods for

The invention relates to a process for preparing hydrofluorocarbons of the formulas CF.sub.3 (CH.sub.2 CF.sub.2).sub.n F comprising reacting at least one reactant selected from CCl.sub.3 (CH.sub.2 CCl.sub.2).sub.n Cl, CCl.sub.3 (CH.sub.2 CF.sub.2).sub.n Cl or CCl.sub.2 [(CH.sub.2 CF.sub.2)Cl].sub.2, where n=1 to 3, with hydrogen fluoride at a temperature of from about 25.degree. to about 200.degree. C.

Growing community of inventors

Amherst, NY, United States of America

G V Madhavan