Separation of substances from a liquid mixture by crystallization

US5755975A · kind A · utility

Assignee

• BASF SE

Inventors

• Bernd Eck · Viernheim, DE
• Bernhard Maltry · Obrigheim, DE

Key dates

• Filing date: Sep 9, 1996
• Grant date: May 26, 1998
• Expiry date: Sep 9, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C7/14
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

In a process for separating substances from a liquid mixture by crystallization in a crystallizer, a two-phase seed layer in the form of a melt or solution of the mixture to be separated, with crystals suspended therein, is applied, prior to the crystallization, to those surfaces of the crystallizer from which crystals grow during the crystallization.