Variable and self-regulating permeate recycling in organophilic nanofiltration

US11806669B2 · kind B2 · utility

Assignee

• Evonik Operations GmbH · DE

Inventors

• Frederik Gluth · Mülheim an der Ruhr, DE
• Marc Schäpertöns · Recklinghausen, DE
• Thomas Quell · Recklinghausen, DE
• Frank Geilen · Haltern am See, DE
• Stefan Drees · Delmsen, DE
• Fabian Höckelmann · Marl, DE
• Robert Franke · Marl, DE

Key dates

• Filing date: Dec 13, 2021
• Grant date: Nov 7, 2023
• Expiry date: Apr 5, 2042

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D2317/022
• 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 a portion of the overall permeate stream is recycled to the feed vessel and/or beyond the feed vessel but upstream of the conveying device, and the remainder of the overall permeate stream is removed, with the recycled permeate having a higher concentration of the component to be separated off than the removed permeate. The presently disclosed method can especially be used for separation of a homogeneously dissolved catalyst from a liquid reaction mixture.