| 摘要 |
1,183,524. Separating hydrocarbons. BRITISH PETROLEUM CO. Ltd. 25 April, 1967 [8 Sept., 1966], No. 40186/66. Heading C5E. Various hydrocarbon mixtures are separated by preferential complex formation in the vapour or liquid phase with a compound selected from tris - (o - phenylenedioxy) - cyclotriphosphazene, tris - (o - phenylenediamino) - cyclotriphosphazene and tris - (2,3 - naphthyldioxy)- cyclotriphosphazene. The mixture to be separated may comprise (1) two or more aliphatic hydrocarbons having the same carbon number and degree of saturation but different degrees of branching, the less or least branched component being preferentially complexed; (2) two or more components of different carbon number, the mixture being either all cyclic or all non- cyclic, the highest carbon number component being preferentially complexed; or (3) cis- and trans-isomers, the trans-isomer being preferentially complexed. The complexing agent may be used in the free state, or on a support, suitable supports being ground firebrick, diatomaceous earth, silica gel, alumina or porous glass, the support being preferably silanized. The feed may be diluted by an inert gas or liquid, and the subsequent desorption of the sorbed components may be effected by displacement with another sorbate, by elution with an inert gas or liquid, by reducing the ambient pressure, or by raising the temperature. A purging stage may be interposed between the sorption and desorption steps. Typical feeds include n-heptane /n-hexane / n-pentane, cis-heptene-2 / cishexene - 2, 2,3 - pentadiene / 3 - methyl - 1,2- butadiene, trans - hexene - 2 / cis - hexene - 2, cis - hexene - 2 / 2 - methylpentene - 1, and ethylcyclohexane / methylcyclohexane, the first named component being preferentially complexed in each case. |
