Alliedsignal Inc.

Allied Chemical Corporation

William J Cunningham

Addison Miles Smith

John N Armor

Emery J Carlson

Robert A Wiles

Addison M Smith

Chromium(III) oxide and hydroxide aerogels are produced by the reaction of chromium(VI) oxide with a solvent which is reducing to chromium(VI), such as methanol, heating the solution to hypercritical conditions, and venting the solvent hypercritically. The product aerogels exhibit surface areas above 400 m.sup.2 /g, pore volumes of at least 2 cm.sup.3 /g and a substantially uniform pore size distribution. Also disclosed is a unique process which employs high pore volume, high surface area chromium(III) oxide or hydroxide as a fluorination catalyst. More particularly, reaction of C.sub.2 Cl.sub.3 F.sub.3 with HF over these catalysts produced high yields of C.sub.2 Cl.sub.2 F.sub.4 and C.sub.2 ClF.sub.5.

Chromia aerogel, method of producing same and fluorination process

Chromium aerogel method of producing same and fluorinating process

The present invention provides a novel process for producing 1,2-dichloro-1,1,2,2-tetrafluoroethane substantially free of the 1,1-isomer. The process includes contacting, in the vapor phase, an organic feed composition containing a major amount of the 1,2-isomer and a minor amount of 1,1-isomer with hydrogen in the presence of a hydrodechlorination catalyst. The process selectively degrades the 1,1-isomer. Also provided is a process for producing high purity 1,2-isomer.

Process for producing 1,2-dichloro-1,1,2,2-tetrafluoroethane

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Williamsville, NY, United States of America

William J Cunningham