METHOD OF A HEDROCARBONACEOUS MIXTURE REFINING Russian patent published in 2005 - IPC

FIELD: petrochemical industry; methods of hydrocarbon mixtures refining.

SUBSTANCE: the invention is pertaining to the field of petrochemical industry, in particular, to refining of the hydrocarbon mixtures. The invention provides for refining of a hydrocarbon mixture containing iso- and normal butanes and, probably, the butanes containing as a minimum two stages of the contacting with the solid high-acidic catalyst(s). The mixture first is exposed to refining at the stage(-s) mainly of the primary transformation of isobutene: from the product(-s) distil off a mixture of the non-reacted hydrocarbons C₄, which then is exposed to a liquid-phase refining at the stage(-s) of the primary transformation of n-butanes and from the product distil off the non-reacted hydrocarbons containing predominary butanes. At the stage(-s) of the primary transformation of isobutene the contacting is carried out at the presence of water and-or alcohol_{C1-C2 in a quantity sufficient for transformation of the majority of isobytene into tret-butanol and-or into alkyl-tret-butyl ether. At the stage of primary transformation of n-butenes feed the mixture of the non-reacted hydrocarbons containing no more than 8 % of isobutene and admixture of water and-or alcohol from a previousa stage (-s) and the majority of n-butenes transform into dimers and codimers of n-butenes at the temperature of as a minimum by 15°C higher, than at the stage(-s) of the primary transformation of isobutene. The technical effect: transformation of the tret-alkenes into the oxygen-containing products having the high octane numbers.}

EFFECT: the invention ensures transformation of the tret-alkenes into the oxygen-containing products having the high octane numbers.

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