Regulation of a wash column in a melt crystallization process

US7323016B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Jorg Heilek · Bammental, DE
• Bernd Eck · Viernheim, DE
• Dieter Baumann · Greven, DE

Key dates

• Filing date: Jul 27, 2001
• Grant date: Jan 29, 2008
• Expiry date: Jul 19, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/47
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The present invention relates to the use of an optical line detector for regulating the position of the wash front and/or of the build-up front of the crystal bed of a wash column in a melt crystallization process and a corresponding regulation method. The line detector, for example a CCD camera or a linear array of reflection probes, is arranged in such a way that optical properties of the crystal bed can be detected continuously in a region running parallel to the longitudinal axis of the wash column, this region covering the desired setpoint position of the wash front or of the build-up front.