Patent · US Active

Process and facility for recovering methoxypropanols from an aqueous stream

US11697631B2 · kind B2 · utility

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14Claims

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Assignees

Evonik Operations GmbH · DE
THYSSENKRUPP INDUSTRIAL SOLUTIONS AG · DE

Inventors

Michael Kleiber · Hattersheim, DE
Willi Hofen · Rodenbach, DE

Key dates

Filing date	Mar 23, 2021
Grant date	Jul 11, 2023
Priority date	—
Expiry date	Mar 23, 2041

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P70/10
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A process can be used for recovering 1-methoxy-2-propanol and 2-methoxy-1-propanol from an aqueous effluent stream by liquid-liquid-extraction, followed by extractive distillation, distillation of methoxypropanols from the extraction solvent, and distillative separation of the methoxypropanol isomers. Recovered extraction solvent is recycled to the extraction and extractive distillation. Heat transfer from recovered extraction solvent to the extract fed to the extractive distillation reduces energy demand of the process. A facility for this process contains a countercurrent extraction column, an extractive distillation column, a solvent recovery distillation column, an isomer separation distillation column, and a heat exchanger for transferring heat from recovered extraction solvent to the extract fed to the extractive distillation.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.