Abstract: Methods employing a catalyst system comprising a hydrogen fluoride solution of tantalum pentafluoride and/or niobium pentafluoride for the preparation of 2,6-dimethyldecalin from a 12 carbon atom-containing dicyclic naphthenic isomer thereof and for the preparation of a mixture of 2,6-dimethyldecalin and a 12 carbon atom-containing dicyclic naphthenic isomer thereof from methylcyclopentane and/or cyclohexane are disclosed.

Abstract: A process for producing viscous polyisobutylene which comprises polymerizing isobutylene in a liquid phase using a halided alumina catalyst.

Abstract: A process which comprises fractionating a wide-boiling range naphtha feedstock into a low-boiling, light-naphtha fraction having an end or maximum boiling point within the range of about 190.degree. to about 200.degree. F. (88.degree. to about 104.degree. C.), and a high-boiling, heavy-naphtha fraction having an initial boiling point within a range of about 190.degree. to about 220.degree. F. (88.degree. to about 104.degree. C.), and contacting the light-naphtha fraction in an isomerization zone with added hydrogen and a catalyst comprising tantalum pentafluoride and hydrogen halide to produce effluent yielding naphthene components which are blended with the heavy-naphtha fraction. The resulting blended material can be processed by reforming to produce an aromatic-rich naphtha product and hydrogen.

Abstract: An isomerization process which comprises isomerizing a hydrocarbon component comprising at least one saturated C.sub.5 -C.sub.6 hydrocarbon in the presence of hydrogen and a catalyst comprising tantalum pentafluoride and hydrogen halide and in the presence of a hydrocarbon promoter comprising at least one member selected from the group consisting of C.sub.8 -C.sub.14 multiple-branched paraffins, wherein the total concentration of C.sub.8 -C.sub.14 multiple-branched paraffins, is in the range of about 1 to 50 parts by weight per each 100 parts by weight of said saturated C.sub.5 -C.sub.6 hydrocarbons.

Abstract: Catalyst and process for octane upgrading of a light naphtha feed using fluorosulfonic acid and antimony pentafluoride to which a small amount of hydrogen fluoride is added. The catalyst is at least as active as the fluorosulfonic acid-antimony pentafluoride system and in addition shows enormously improved selectivity and lifetime.

Abstract: Catalyst and process for octane upgrading of light naphtha feed by using a fluoroalkanesulfonic acid-antimony pentafluoride mixture as a conversion catalyst.

Abstract: An improved process for alkylating at least one alkylatable isoparaffin with at least one alkylating agent selected from the class consisting of an olefin and an alkyl sulfate ester in the presence of a catalyst comprising a major amount of sulfuric acid and a minor amount of hydrofluoric acid.The invention of this application is related to the inventions of the following applications filed simultaneously with this application and by the same applicant: Ser. No. 527,713 and Ser. No. 527,715.