IMPROVED DEVICE FOR SULPHUR-CONTAINING COMPOUNDS EXTRACTION, CONTAINING PERIODIC PRETREATMENT REACTOR, AND REACTOR OPERATING IN PRELIMINARY TREATMENT DISPLACEMENT MODE Russian patent published in 2016 - IPC C10G19/02 C10G21/08 

FIELD: technological processes.

SUBSTANCE: present invention relates to method of sulphur-containing compounds extracting from hydrocarbons gasoline fraction or liquefied petroleum gas by extraction in “liquid-liquid” system with sodium hydroxide solution using pretreatment of raw material to be cleaned, which is located upstream of sodium hydroxide extraction plant. At that, preliminary treatment plant consists of first reactor operating in intermittent mode, and in-series installed second flow reactor operating in displacement mode, characterized by Peclet number from 3 to 10, preferably from 3 to 5, where U denotes linear speed of hydrocarbon phase flow in reactor, L is reactor length and D_ax is hydrocarbon phase longitudinal mixing coefficient in second reactor.

EFFECT: disclosed method enables to considerably increase cleaning process efficiency.

5 cl, 4 dwg, 3 ex