Variable, self-regulating permeate recycling in organophilic nanofiltration

US12296301B2 · kind B2 · utility

Assignee

• Evonik Oxeno GmbH & Co. KG · DE

Inventors

• Thomas Quell · Recklinghausen, DE
• Johannes Knossalla · Gahlen, DE
• Robert Franke · Marl, DE
• Stefan Drees · Delmsen, DE
• Frederik Gluth · Mülheim an der Ruhr, DE
• Marc Schäpertöns · Recklinghausen, DE
• Fabian Höckelmann · Marl, DE

Key dates

• Filing date: Dec 13, 2021
• Grant date: May 13, 2025
• Expiry date: Nov 1, 2043

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D2317/02
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention provides an improvement in terms of control and process technology for a method of continuous removal of a component from a liquid mixture using a membrane unit comprising at least one membrane stage. The improvement is that at least some of the overall permeate stream obtained is recycled to the feed vessel and/or beyond the feed vessel but upstream of the conveying device. The presently disclosed method can especially be used for separation of a homogeneously dissolved catalyst from a liquid reaction mixture.