Isolation of .alpha.-ethynyl carbinols by distillation

US6316680A · kind A · utility

Assignee

• BASF SE

Inventors

• Ralf-Thomas Rahn · Mannheim, DE
• Harald Rust · Bochum, DE
• Thomas Ruhl · Bischofswerda, DE
• Jochem Henkelmann · Mannheim, DE
• Susanne Stutz · Weinheim, DE

Key dates

• Filing date: Dec 6, 1999
• Grant date: Nov 13, 2001
• Expiry date: Dec 6, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C29/80
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

In a process for isolating .alpha.-ethynyl carbinols from the liquid reaction mixture from the addition of acetylene onto .alpha.,.beta.-unsaturated carbonyl compounds by distillation, the distillation is carried out continuously, the feed stream is introduced into the middle section of a distillation column (K), the major part of the water is distilled off azeotropically together with the solvent at the top of the column, and the .alpha.-ethynyl carbinol target product is taken off below the feed point to the column.