Abstract: A process for the production of R.sub.2 -isoolefins by decomposition of R.sub.1 --O-tertiary-R.sub.2 is disclosed. R.sub.1 --O-secondary-R.sub.2 that are normally present in the feed stream are selectively removed. Removal of these R.sub.1 --O-secondary-R.sub.2 lowers the R.sub.2 -normal olefin impurity and increases the yield of the product R.sub.2 -isoolefins.

Abstract: A process is disclosed for the catalytic conversion of an olefin-containing C.sub.3 and/or C.sub.4 feed (1) into aromatic hydrocarbons (22) and C.sub.3 and/or C.sub.4 paraffins (25,26). The process may result in a net consumption of hydrogen and operates at relatively mild temperature conditions, with preferred temperatures in the reaction zone (4) being less than 425 degrees Celsius. The severity of the operating conditions and the length of time the catalyst is used are controlled to hold down total carbon deposition and to increase aromatics selectivity. A catalyst comprising gallium supported on a zeolite containing base is preferred. The feed stream contains a mixture of paraffins and olefins, with aromatics production being directly related to feed olefin content.

Abstract: A process is disclosed for the conversion of at least a portion of the light hydrocarbons, such as propane, present in a natural gas feed stream into C.sub.6 -plus hydrocarbons including benzene. Noncondensibles such as hydrogen and nitrogen are separated from both the natural gas feed stream and from a reaction zone effluent stream in a common vapor-liquid separation vessel. The liquid stream produced in this initial separation is subjected to fractional distillation which recovers the C.sub.6 -plus product hydrocarbons and a stream of lighter hydrocarbons, which is passed into a dehydrocyclodimerization reaction zone.