Isolation of neopentyl glycol hydroxypivalate (NGH)

US6048441A · kind A · utility

Assignee

• BASF SE

Inventors

• Heinz Auer · Neulußheim, DE
• Siegfried Kruger · Speyer, DE
• Stephan Scholl · Bad Dürkheim, DE
• Theodor Weber · Ludwigshafen, DE
• Johann-Peter Melder · Schifferstadt, DE

Key dates

• Filing date: Jul 24, 1998
• Grant date: Apr 11, 2000
• Expiry date: Jul 24, 2018

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S203/20
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Neopentyl glycol hydroxypivalate (NGH) is isolated from a mixture containing NGH, lower- and higher-boiling products and inorganic salts and purified in a two-stage process, wherein PA1 in a first separation stage, the inorganic salts and part of the higher-boiling products are separated off in a wiped-film evaporator and a vapor stream consisting of NGH, lower- and higher-boiling products is discharged and fed to a heat exchanger and condensed therein, PA1 and, in a second separation stage, the resulting condensate is distilled in a rectification column from which NGH is taken off in a side stream and condensed. Further discharges of the rectification column containing lower-boiling products or higher-boiling products are separately taken off. The higher-boiling products which comprise residual NGH are partly or completely recycled to the lower region of the rectification column.