METHOD AND APPARATUS FOR ISOMERISATION OF C-C HYDROCARBONS WITH SUPPLY OF PURIFIED CIRCULATING HYDROGEN STREAM Russian patent published in 2015 - IPC C07C5/27 C07C9/14 C07C9/16 

FIELD: chemistry.

SUBSTANCE: invention relates to a method for isomerisation of C₅-C₆ hydrocarbons with supply of circulating hydrogen, which includes loading hydrogen and feedstock containing C₅-C₆ hydrocarbons into an isomerisation zone, products of which are fed into a separator, removing a product stream containing C₄ or heavier hydrocarbons from below the separator into a fractionation unit consisting of at least one fractionation column, and removing from the top of the separator a gas stream consisting of hydrogen and light hydrocarbons, which is subjected to recirculation using a recirculating compressor for combining with the feedstock, into which an additional amount of hydrogen is fed if necessary. The method includes purification of the circulating hydrogen stream from C₅ and C₆ hydrocarbons, which are the end products of the isomerisation process, to a value not greater than presence thereof in the feedstock, and also from components which boil at a temperature higher than the boiling point of isopentane. The fractionation unit consists of a stabiliser, a first and a second fractionation column. The present invention also relates to an apparatus for carrying out said method.

EFFECT: use of the present method enables to obtain an isomerisation product having a high octane number.

16 cl, 2 tbl, 6 dwg