Method for producing hydroxypivalaldehyde and neopentyl glycol

US7767865B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Tilman Sirch · Schifferstadt, DE
• Michael Steiniger · Neustadt, DE
• Steffen Maas · Bubenheim, DE
• Stefan Rittinger · Mannheim, DE
• Stephan Schlitter · Schifferstadt, DE

Key dates

• Filing date: Feb 25, 2008
• Grant date: Aug 3, 2010
• Expiry date: Feb 25, 2028

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C45/82
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The preparation of hydroxypivalaldehyde is effected by aldolizing isobutyraldehyde with formaldehyde and subsequently working up the resulting reaction effluent by distillation, wherein the reaction effluent is fed to a distillation column which is operated at a top pressure in the range from 0.5 to 1.5 bar and in which a two-stage condensation is provided in the top region, in which the vapors are first conducted into a partial condenser operated at a temperature in the range from 50 to 80° C., whose condensate is recycled at least partly into the distillation column, and in which the vapors uncondensed in the partial condenser are fed to a downstream condenser operated at a temperature in the range from −40 to +30° C., whose condensate is at least partly discharged.