Carrier-vapor distillation

US4090922A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Kurt Bauer
• Hans-Walter Brandt · Odenthal, DE
• Jurgen Schroter · Berlin, DE

Key dates

• Filing date: Feb 2, 1977
• Grant date: May 23, 1978
• Expiry date: Feb 2, 1997

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C45/83
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Process for the separation or purification of heat-sensitive compounds by carrier-vapor distillation, wherein the superheated solvent vapor which is loaded with the compound to be distilled is cooled by treatment with condensed solvent in counter-current and the amount of condensed solvent is measured in such a manner that a saturated solution of the compound which is almost at boiling point is formed from the superheated, loaded vapor. The process being especially apted for separating or purifying 4-hydroxybenzaldehydes optionally substituted by one or more C.sub.1 -C.sub.4 -alkoxy groups.