REMOVAL OF PARAFFIN FROM STREAMS CONTAINING C Russian patent published in 2020 - IPC C07C41/06 C07C11/08 C07C7/08 C07C7/144 C10G70/04 B01D53/22 

FIELD: chemistry.

SUBSTANCE: disclosed is a method of producing 1-butene, which includes: feeding a stream containing C₄ into a process for removing paraffin to form a stream enriched in olefins, wherein the paraffin removal process is selected from: (a) an extraction distillation using a solvent containing an organic nitrile; (b) passing a stream having C₄ composition through a semipermeable membrane; and (c) combinations thereof; and isomerising at least portion of 2-butene present in the olefin-enriched stream into 1-butene to form an isomerisation product stream comprising at least 80 wt. % of 1-butene; wherein the stream containing C₄ contains isobutylene, 1-butene, 2-butene, n-butane and isobutane; wherein the stream containing C₄ contains from 40 wt. % to 70 wt. % olefins and from 30 wt. % to 85 wt. % paraffins; wherein paraffin removal process is selected from an extraction distillation, wherein the solvent comprises acetonitrile and characterized by relative volatility C₄ compared with the solvent, at least, having coefficient of 1.70, and the solvent is diluted before extraction by a quantity of water sufficient to form a dissolution mixture containing 1 wt. % to 15 wt. % water; and passing a stream containing C₄ through a semipermeable membrane containing 30–60 % of a metal selected from silver, copper and combinations thereof, and a metal-chelated polysaccharide membrane.

EFFECT: technical result is resolution or at least reduction of problem associated with non-separation of non-purified streams C₄ by typical methods of distillation.

8 cl, 8 ex, 1 tbl, 5 dwg