Simplified process for isolating pure 1,3-butadiene

US10968152B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Bernd Heida · Haßloch, DE
• Tobias Keller · Dittelsheim-Heßloch, DE

Key dates

• Filing date: Mar 12, 2018
• Grant date: Apr 6, 2021
• Expiry date: Mar 12, 2038

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C7/08
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for isolating pure 1,3-butadiene from a crude C4 fraction, which produces pure 1,3-butadiene having a prescribed maximum content of at least one low boiler and a prescribed maximum content of 1,2-butadiene, in each case based on 1,3-butadiene, wherein (a) a low boiler fraction and a high boiler fraction are separated off by distillation from the crude C4 fraction, giving a purified C4 fraction whose content of the at least one low boiler, based on 1,3-butadiene, is equal to or lower than the prescribed maximum content of the at least one low boiler and whose content of 1,2-butadiene, based on 1,3-butadiene, is equal to or lower than the prescribed maximum content of 1,2-butadiene; (b) the purified C4 fraction is subjected to at least one extractive distillation using a selective solvent, giving at least a fraction comprising butanes and butenes and a pure 1,3-butadiene fraction, is described. The process makes a pure distillation column dispensable.