Preparation of Cyclopentane from an Oklahoma Natural Gasoline

Abstract

The application of precise fractionation to a pentane-hexane fraction of natural gasoline from the Burbank field has led to the isolation and testing of cyclopentane in high concentration.The best sample contained 95 per cent cyclopentane; a 44-gallon composite contained 91 per cent.The amount of cyclopentane in the original pentane-hexane stock is estimated to be 5.7 per cent, in the 12-pound Reid vapor pressure natural gasoline, 2.4 per cent. CERTAIN hydrocarbon oils have long been known to contain small amounts of cyclopentane. Brown and Carr (1) in 1926 found an indication of cyclopentane in several gasolines. In 1938 Tongberg, Fenske, and Sweeney (5) cited the presence of cyclopentane in practically all of twenty naphthas investigated by them. They further mentioned the possibility of obtaining fractions (5 or more volume per cent of over-all naphtha) of 50 per cent of a particular hydrocarbon by applying efficient fractionation. Cyclo-

Cyclopentane and Neohexane in Petroleum

“…Other reported precise estimations (7,15) are not comparable because the cyclopentane-neohexane was obtained from a naphtha derived from natural gas rather than from petroleum.…”

Kinetic Molecular Sieving of Cyclopentane/Neohexane Mixtures by the MFI Zeolite with Intersecting 10-Ring Channels

“…By 2023, the global market of cyclopentane is expected to reach US$ 335.7 million, with an annual growth rate of 6.7% . Cyclopentane resource has been detected in light petroleum fractions like naphtha , and natural gas liquid; however, it is hardly separated as a commercial grade product through traditional fractionation operations owing to the formation of close-boiling/azeotropic mixtures with hydrocarbons possessing similar numbers of carbon atoms. Neohexane or 2,2-dimethylbutane (22DMB) is a major contaminant in cyclopentane.…”

Dehydrogenation of Methylcyclopentane over Chromia-Alumina Catalysts

“…Dehydrogenation of cyclohexane over conventional dehydrogenation catalysts leads primarily to benzene and cannot be easily arrested at cyclohexene. It has been suggested to dehydrogenate methyleyclopentane (MCP), a hydrocarbon relatively abundant in naphthenic crude oils (3)(4)(5)(6) and isomerize methylcyclopentene to cyclohexene (7). Dehydrogenation steps described in the literature have been carried out over molybdena-alumina or chromia-alumina catalysts in the absence or presence of external hydrogen.…”