Occidental Chemical Corporation

Deborah J Olsen

Bobby F Dannels

Hang-Chang Bobby Chen

John Forcucci

Disclosed is a method and apparatus for removing oxygen from hydrogen, hydrocarbon, or halogenated hydrocarbon gas which contains about 0.01 to about 10 mole % oxygen. The oxygen removal is accomplished by contacting the gas with a Hopcalite catalyst at a temperature of about 100.degree. to about 300.degree. C. The invention can be part of a process for making 1,2-dichloroethane where, in a first reaction, ethane and chlorine are reacted to make ethylene and hydrogen chloride and, in a second reaction, the ethylene and hydrogen chloride are reacted with excess oxygen to make the 1,2-dichloroethane. The unreacted ethane can be recycled to the first step after the method of the invention is applied to remove the oxygen.

Removing oxygen from hydrocarbon gases

A mixture of telomers prepared by reacting chlorotrifluoroethylene with 1,1,2-trichlorotrifluoroethane (CCl.sub.2 FCF.sub.2 Cl) is purified by reacting the telomer mixture with potassium hydroxide in the presence of a quarternery ammonium compound and, optionally, a glycol, separating and removing impurities from the telomer mixture, subsequently reacting the telomer with potassium permanganate in the presence of the quarternery ammonium compound in a solvent, and recovering a purified telomer mixture. If additional purity is required, the purified telomer mixture can be heated to a temperature of from about 150.degree. C. to about 250.degree. C. for at least 12 hours, and impurities formed during the thermal treatment are removed. The purified telomers of this invention find uses in applications requiring the use of non-flammable hydraulic fluids.

Purification of telomers prepared from chlorotrifluoroethylene and

Telomers are prepared by reacting chlorotrifluoroethylene with 1,1,2-trichlorotrifluoroethane (CCl.sub.2 FCF.sub.2 Cl) in the presence of metallic iron or stainless steel, and optionally, a halide-containing compound selected from the group consisting of tetrabutyl ammonium bromide, tetramethyl ammonium chloride, n-chlorosuccinimide, triethylamine hydrochloride, LiCl, MoCl.sub.5 and FeCl.sub.3. The reaction is conducted at a temperature of from about 150.degree. C. to about 200.degree. C. in a nitrile group-containing solvent selected from the group consisting of acetonitrile, propionitrile and ethyl cyanoacetate. Preferably, the CCl.sub.2 FCF.sub.2 Cl and chlorotrifluoroethylene are present in a mole ratio of from about 1:1 to about 3:1. respectively, to minimize the amount of high molecular weight species formed during the reaction. The telomers of this invention are useful for preparing non-flammable hydraulic fluids.

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Grand Island, NY, United States of America

Deborah J Olsen