Process for purifying removal of a chemical target compound from a suspension of crystals thereof in mother liquor

US8217198B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Joerg Heilek · Bammental, DE
• Wolfgang Schneider · Marl, DE
• Wolfgang Gunkel · Mannheim, DE
• Volker Schliephake · Schifferstadt, DE
• Klaus Joachim Mueller-Engel · Blankenloch, DE

Key dates

• Filing date: Feb 16, 2010
• Grant date: Jul 10, 2012
• Expiry date: Dec 12, 2030

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16C19/56
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for purifying removal of a chemical target compound from a suspension of crystals thereof in mother liquor in a wash column with forced transport of the crystal bed from the top downward, in which crystals are removed from the lower end of the crystal bed with a rotating removal device and melted, and a portion of the crystal melt is conducted back toward the crystal bed as wash melt, the removal device being secured with a drive shaft conducted into the wash column from the bottom through an inlet having a seal, said drive shaft being driven about its longitudinal axis by a drive unit for rotation and being mounted so as to be rotatable about its longitudinal axis in more than one bearing, such that the mounting in one of the bearings absorbs the downward force acting on the drive shaft, the mounting in two or more bearings absorbs forces acting radially outward from the drive shaft, and the mounting in one bearing is additionally capable of absorbing an upward force acting on the drive shaft.