Abstract: Catalysts containing niobium or tantalum halides which have been deactivated by contact with oxygen are regenerated by being contacted with a halogenated hydrocarbon.

Abstract: A process is disclosed for the production of alkylaromatic hydrocarbons by the HF catalyzed reaction of an aromatic hydrocarbon with a C.sub.8 -plus acyclic olefin. A portion of the HF used as catalyst is regenerated by passage into a stripping column which has a primary function of stripping dissolved HF out of a hydrocarbonaceous mixture produced in the alkylation zone. This eliminates the requirement for a separate HF regeneration column and the costs associated with this column.

Abstract: A process is disclosed for the production of alkylaromatic hydrocarbons by the alkylation of an aromatic hydrocarbon, such as benzene, with a C.sub.8 -plus acyclic olefin which preferably is a normal olefin. The hydrocarbonaceous effluent of the alkylation reaction zone is separated by fractional distillation to yield both a product stream containing monoalkylated aromatics and a small bottoms stream containing dialkylated aromatics and other high boiling compounds but which is substantially devoid of the product monoalkylated aromatics. The product stream is a portion of a sidecut stream withdrawn from the first of two vacuum columns, with a second portion of the sidecut being passed into the second column. The bottoms stream of the first column is also passed into the second column and the overhead vapor of the second column enters an upper portion of the first column.

Abstract: A 1-cyclohexyl-2-cyclohexylphenylethane derivative of the following general formula ##STR1## wherein R.sub.1 and R.sub.2, independently from each other, represent a linear alkyl group having 1 to 7 carbon atoms.

Abstract: A process for producing high-vacuum oils comprises alkylation of condensed and non-condensed aromatic hydrocarbons by means of secondary normal alkylchlorides containing 8 to 12 carbon atoms or mixtures of said chlorides. The alkylchlorides are employed in a molar ratio to the condensed or non-condensed aromatic hydrocarbons of from 2.5:1 to 5:1. The alkylation reaction is conducted at a temperature within the range of from 20.degree. to 100.degree. C. in the presence of from 2 to 15 mol. % of aluminum chloride based on the amount of the employed alkylchlorides until the evolution of hydrogen chloride ceases, whereafter the catalyst is separated from the resulting alkylate. The alkylate is subjected to a vacuum fractionation and the desired fraction is collected which has a boiling temperature within the range of from 220.degree. to 250.degree. C./0.2-0.3 mm Hg, while the preceding fraction is recycled to alkylation stage.

Abstract: A synthetic oil useful as an insulating fluid in electrical apparatus is prepared by reacting an aromatic compound with the oligomers of four to 12 carbon alpha-olefins containing predominantly at least about 30 carbon atoms up to about 60 carbon atoms. A synthetic insulating oil for electrical power transformers is prepared by reacting benzene in a 1:1 molar ratio with a tetramerpentamer mixture obtained by the oligomerization of 1-decene.

Abstract: A process for the HF-catalyzed alkylation of aromatic hydrocarbons is disclosed. A liquid-phase alkylation zone effluent stream comprising product alkylaromatic hydrocarbon is passed into an intermediate point of a first fractionation column. A sidecut is removed from the first column at a higher intermediate point and passed into a sidecut stripping column. The bottoms stream of the sidecut stripping column contains the feed aromatic and about 4-10 mole percent paraffinic hydrocarbons and is recycled to the alkylation zone. The overhead vapor stream of the sidecut stripping column is passed into the first column to aid in fractionation.

Abstract: A process for the HF-catalyzed alkylation of aromatic hydrocarbons is disclosed. A first overhead vapor stream removed from a first fractionation column which is used to regenerate the liquid-phase HF is passed directly into an upper intermediate point of a second fractionation column. A hydrocarbon stream containing the feed aromatic hydrocarbon and the product hydrocarbon is separated from liquid-phase HF and is then passed into the second fractionation column. HF dissolved in the hydrocarbon stream is removed from the second column as part of a second overhead vapor stream.

Abstract: A process for the production of the internal isomers (3-phenyl, 4-phenyl and higher) from linear phenylalkane mixtures via selective cracking of the 2-phenylalkane isomer over crystalline zeolite catalysts having a silica to alumina ratio of at least about 12 and a constraint index, as herein defined, of about 1 to 12.

Abstract: A process for preparing alkylbenzenes, according to which benzene is reacted with an olefin (or mixture of olefins) in the presence of a suitable catalyst, according to the Friedel-Crafts reaction. The reactant which is reacted with the benzene is the product of the autocondensation of an olefin or a mixture of olefins, having a number of carbon atoms of between 10 and 15, whereby a mixture of both light and heavy alkylbenzenes is obtained, the heavy alkylbenzenes being useful for lubricating compositions.

Abstract: Electrical apparatus containing a novel synthetic oil as an insulating fluid which is prepared by reacting an aromatic compound with the oligomers of four to 12 carbon alpha-olefins containing predominantly at least about 30 carbon atoms up to about 60 carbon atoms. For example, an electrical power transformer is provided containing a synthetic insulating oil prepared by reacting benzene in a 1:1 molar ratio with a tetramer-pentamer mixture obtained by the oligomerization of 1-decene.

Abstract: Dialkylation process for the manufacture of synthetic oils comprising contacting olefin with alkylbenzene in the presence of a borontrifluoride carboxylic acid complex.