Process for operating a continuous removal of a target product X in the form of fine crystals of the target product X

US8106240B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Joerg Heilek · Bammental, DE
• Ulrich Hammon · Mannheim, DE
• Klaus Joachim Mueller-Engel · Blankenloch, DE

Key dates

• Filing date: Sep 11, 2008
• Grant date: Jan 31, 2012
• Expiry date: Mar 1, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/43
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for operating a continuous removal of a target product X in the form of fine crystals of a liquid phase P comprising the target product X and constituents other than the target product X by cooling suspension crystallization in the secondary chamber of an indirect heat exchanger to which liquid phase P flows continuously with simultaneous continuous flow through the primary chamber of the indirect heat exchanger with a coolant, and continuous withdrawal of a crystal suspension S having a degree of crystallization Y from the secondary chamber in two operating states I and II, wherein the coolant temperature is lower, the mass flow of liquid phase P is greater and the molar proportion of the constituents other than the target product X in the liquid phase P in operating state II is greater than in operating state I.