METHOD OF SEPARATING MIXTURES OF ISOPENTANE-ISOAMYLENE-ISOPRENE-CONTAINING HYDROCARBON FRACTIONS OR BUTANE-BUTYLENE-DIVINYL HYDROCARBON FRACTIONS Russian patent published in 2010 - IPC C07C7/08 C07C11/12 C07C11/167 C07C11/18 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of separating isopentane-isoamylene-isoprene-containing hydrocarbon fractions or butane-butylene-divinyl hydrocarbon fractions obtained at the first step of two-step dehydrogenation of corresponding paraffin hydrocarbons, involving separation of paraffin-olefin-diene fraction obtained at the first dehydrogenation step through extraction rectification, and is characterised by that a vapour stream is extracted from a desorber via lateral collection, where the said vapour stream contains large amount of diene, and after condensation, said stream is taken for extraction of the diene end product at the second extraction rectification step, and an olefin fraction which does not contain diene is collected from the top of the desorber and taken to the second dehydrogenation step.

EFFECT: use of said method increases output of the end product.

1 cl, 2 ex, 1 dwg