Process for ion exchangers, particularly for regeneration after softening and demineralization of aqueous solutions

US5108616A · kind A · utility

Inventor

• Gerhard Kunz · Heiligenhaus, DE

Key dates

• Filing date: Jun 22, 1989
• Grant date: Apr 28, 1992
• Expiry date: Jun 22, 2009

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J49/90
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention concerns an ion exchange process and system, particularly for the regeneration step following a softening or desalination of aqueous solutions. The regenerant solution is fed in an upward stream through the ion exchanger in a direction opposite to the charging direction, as a sequence of intermittent pulse intervals consisting of pulse flow followed by a period of no flow. During the pulse flow, there is limited hydrodynamic lifting of the ion exchange resin beds in layers, followed by subsequent sedimentation during the pause period, without mixing of the layers.