Back to results
US 4,072,726 AGranted
Hydrogenation of fluorinated esters
AssigneeAllied Chemical Corporation
InventorsHenry R. Nychka, Richard E. Eibeck, Martin A. Robinson, Edward S. Jones
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeAllied Chemical Corporation
InventorsHenry R. Nychka, Richard E. Eibeck, Martin A. Robinson, Edward S. Jones
Estimating the term…
Fluorinated esters of the formula C.sub.n H.sub.x F.sub.2n+1-x CO.sub.2 CH.sub.2 C.sub.m H.sub.y F.sub.2m+1-y such as CF.sub.3 CO.sub.2 CH.sub.2 CF.sub.3 are hydrogenated to fluorinated alcohols such as CF.sub.3 CH.sub.2 OH using a catalyst having between 50 and 100 percent, and preferably 75-95 percent CuO by weight. In the above formula n= 1 to 13, m= 1 to 13, x= 0 to 3 and y= 0 to 3. In the most preferred esters, n= m and x= y= 0. The catalyst may also contain 0-50 percent and preferably 5-25 percent by weight of a filler or binder such as a silicate salt. The reaction produces greater yields of alcohol and longer catalyst life than with chromite catalysts, and may proceed at substantially atmospheric pressures.
A method for the preparation of fluorinated alcohols of the formula C.sub.n H.sub.x F.sub.2n+1-x CH.sub.2 OH, wherein n=1 to 13 and x=0 to 3 but not more than n, comprising passing at between about 200.degree. C and about 325.degree. C a vaporous mixture of hydrogen and a fluorinated ester of the formula C.sub.n H.sub.x F.sub.2n+1-x CO.sub.2 CH.sub.2 -- C.sub.m H.sub.y F.sub.2m+1-y, wherein n and x are as described above and m=1 to 13 and y=0 to 3 but not more than m, over a catalyst consisting essentially of about 50 to 100 percent by weight CuO and 0 to about 50 percent by weight of an inert base or binder, said catalyst being essentially free of chromite, and recovering the fluorinated alcohol.
Dependencies are inferred from the claim text.