Patent · US Expired

Method for distilling mixtures containing butanediol

US6387224B1 · kind B1 · utility

7Cited by

4References

6Claims

0Family size

Assignee

BASF SE

Inventors

Rolf Pinkos · Bad Dürkheim, DE
Rolf Fischer · Heidelberg, DE
Shelue Liang · Ludwigshafen, DE

Key dates

Filing date	Aug 29, 2000
Grant date	May 14, 2002
Priority date	—
Expiry date	Aug 29, 2020

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C45/82
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for the separation by distillation of a mixture of 1,4-butanediol and at least one 4-hydroxybutyraldehyde, its cyclic hemiacetal and its cyclic full acetals with at least one further alcohol by carrying out the distillation in the presence of an alkaline compound. The mixture to be separated preferably contains a cyclic full acetal of 4-hydroxybutyraldehyde with a further alcohol which has a lower boiling point than butanediol and also the further alcohol in free form. The process is particularly suitable for the separation by distillation of mixtures formed in the hydrogenation of maleic acid derivatives.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.