Abstract: A method of removing hydrogen fluoride from gaseous mixtures of hydrogen fluoride and hydrogen chloride, which contain up to about 5 percent by weight of hydrogen fluoride, is described. The method comprises initially contacting the gaseous mixture with a particulate, substantially anhydrous, bed of alkaline earth metal chloride material, for example, calcium chloride, to produce an effluent gas mixture having a substantially reduced hydrogen fluoride content. The effluent gas is then contacted with a secondary treatment bed of particulate, substantially anhydrous, alkaline earth metal chloride material, for example, calcium chloride, to produce a product gas containing less than 20 ppm of hydrogen fluoride. The temperature of the secondary treatment bed is maintained in the range from about -20.degree. to about +20.degree. C., and, more preferably, in the range from about 0.degree. to about 5.degree. C.

Abstract: A process for the preparation of compounds of the formula:R.sub.n Ar(CF.sub.w' X.sub.p').sub.Zcomprises contacting compounds of the formula:R.sub.n Ar(CF.sub.w X.sub.p).sub.Zin the liquid phase, with hydrogen fluoride in the presence of molybdenum chloride whereinAr is arylR is a substituent on the aryl nucleus selected from the group consisting of aryl, substituted aryl, halogen, alkyl, alkoxy, substituted alkyl, and substituted alkoxy;n is 0 to 9;X is halogen atom other than fluorine;w is 0 to 2;p is 1 to 3;w' is 1 to 3, and is greater than w;p' is 0 to 2, and is less than p;w+p is 3;w'+p' is 3;Z is 1-10; andthe maximum value of n+Z is 10.

Abstract: A process for the preparation of compounds of the formulaR.sub.n Ar(CF.sub.2w.spsb.' X.sub.p.spsb.').sub.Zcomprises contacting compounds of the formulaR.sub.n Ar(CF.sub.w X.sub.p).sub.Zin the liquid phase, with hydrogen fluoride in the presense of molybdenum chloride whereinAr is arylR is a substituent on the aryl nucleus selected from the group consisting of aryl, substituted aryl, halogen, alkyl, alkoxy, and substituted alkyl;n is 0 to 9;X is halogen atom other than fluorine;W is 0 to 2;p is 1 to 3;w' is 1 to 3, and is greater than w;p' is 0 to 2, and is less than p;W + p is 3;w' + p' is 3;Z is 1-10; andThe maximum value of n + Z is 10.