FOR SEPARATING AND PURIFICATION OF 1,3-BUTADIENE FROM C-CARBOHYDRATE MIXTURES Russian patent published in 2012 - IPC C07C7/08 C07C11/167 C10G7/08 

FIELD: chemistry.

SUBSTANCE: invention refers to the method of separating and purification of 1,3-butadiene from the mixture consisting mainly of C₄-carbohydrates and containing 1,3-butadiene and C₄-carbohydrates that differ from the former by the number of unsaturated bonds and/or α-acetylene protons including at least (an) area(s) of extractive rectification with the polar extractant, denudation and ordinary rectification that is characterized by the fact that at least a polar spirit with the boiling point over 120°C is used as the mentioned extractant; stripping of C₄-carbohydrates from the areas of extractive rectification and denudation of the mentioned extractant is performed under the high pressure from 3.5 to 6.5 at, at least into the lower part and/or into the boiler(s) of the extractive rectification area(s) the carbohydrate intermediate desorbent with the boiling point from 27 to 85°C is introduced in the amount that provides its content in the cube(s) of the high pressure denudation area(s) from 3 to 30 % weight; then the intermediate desorbent is stripped from the greater part of the extractant in the low pressure denudation area with 1.0-2.0 at; the extractant is fed back to the upper part of the extractive rectification area(s) and the intermediate desorbent to at least the mentioned point(s) of extractive rectification, and 1,3-butadiene undergoes additional purification from chemical impurities by means of rectification, supposedly with the small amount of extractant.

EFFECT: reduction of losses of 1,3-butadiene and improvement of the processing and economical efficiency.

10 cl, 3 tbl, 3 ex, 3 dwg