Oxidation of Monoethylene Glycol to Glycolic Acid with Gold-Based Catalyst and Glycolic Acid Isolation by Electrodialysis
In this work, a highly selective and active gold-based catalyst for the oxidation of high concentrated monoethylene glycol (MEG) in aqueous solution (3 M, 20 wt%) is described. High glycolic acid (GA) selectivity was achieved under mild reaction conditions. The optimization of the catalyst compositi...
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| Format: | Article |
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MDPI AG
2021-12-01
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| Online Access: | https://www.mdpi.com/2624-781X/3/1/4 |
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| author | Sarah Tschirner Eric Weingart Linda Teevs Ulf Prüße |
| author_facet | Sarah Tschirner Eric Weingart Linda Teevs Ulf Prüße |
| author_sort | Sarah Tschirner |
| collection | DOAJ |
| description | In this work, a highly selective and active gold-based catalyst for the oxidation of high concentrated monoethylene glycol (MEG) in aqueous solution (3 M, 20 wt%) is described. High glycolic acid (GA) selectivity was achieved under mild reaction conditions. The optimization of the catalyst composition and of the reaction conditions for the oxidation of MEG in semi-batch mode under alkaline conditions led to a GA yield of >80% with a GA selectivity of about 90% in short reaction time. The bimetallic catalyst 0.1 wt% AuPt (9:1)/CeO<sub>2</sub> showed very high activity (>2000 mmol<sub>MEG</sub>/g<sub>metal</sub>min) in the oxidation of MEG and, contrary to other studies, an extremely high educt to metal mole ratio of >25,000 was used. Additionally, the gold–platinum catalyst showed a high GA selectivity over more than 10 runs. A very efficient and highly selective process for the GA production from MEG under industrial relevant reaction conditions was established. In order to obtain a GA solution with high purity for the subsequent polymerization, the received reaction solution containing sodium glycolate, unreacted MEG and sodium oxalate is purified by a novel down-stream process via electrodialysis. The overall GA yield of the process exceeds 90% as unreacted MEG can be recycled. |
| first_indexed | 2024-03-09T12:48:59Z |
| format | Article |
| id | doaj.art-697aa525c4c742368a8d8ae3ed77a215 |
| institution | Directory Open Access Journal |
| issn | 2624-781X |
| language | English |
| last_indexed | 2024-03-09T12:48:59Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
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| spelling | doaj.art-697aa525c4c742368a8d8ae3ed77a2152023-11-30T22:09:18ZengMDPI AGReactions2624-781X2021-12-0131475810.3390/reactions3010004Oxidation of Monoethylene Glycol to Glycolic Acid with Gold-Based Catalyst and Glycolic Acid Isolation by ElectrodialysisSarah Tschirner0Eric Weingart1Linda Teevs2Ulf Prüße3Thünen Institute of Agricultural Technology, Bundesallee 47, 38116 Braunschweig, GermanyThünen Institute of Agricultural Technology, Bundesallee 47, 38116 Braunschweig, GermanyThünen Institute of Agricultural Technology, Bundesallee 47, 38116 Braunschweig, GermanyThünen Institute of Agricultural Technology, Bundesallee 47, 38116 Braunschweig, GermanyIn this work, a highly selective and active gold-based catalyst for the oxidation of high concentrated monoethylene glycol (MEG) in aqueous solution (3 M, 20 wt%) is described. High glycolic acid (GA) selectivity was achieved under mild reaction conditions. The optimization of the catalyst composition and of the reaction conditions for the oxidation of MEG in semi-batch mode under alkaline conditions led to a GA yield of >80% with a GA selectivity of about 90% in short reaction time. The bimetallic catalyst 0.1 wt% AuPt (9:1)/CeO<sub>2</sub> showed very high activity (>2000 mmol<sub>MEG</sub>/g<sub>metal</sub>min) in the oxidation of MEG and, contrary to other studies, an extremely high educt to metal mole ratio of >25,000 was used. Additionally, the gold–platinum catalyst showed a high GA selectivity over more than 10 runs. A very efficient and highly selective process for the GA production from MEG under industrial relevant reaction conditions was established. In order to obtain a GA solution with high purity for the subsequent polymerization, the received reaction solution containing sodium glycolate, unreacted MEG and sodium oxalate is purified by a novel down-stream process via electrodialysis. The overall GA yield of the process exceeds 90% as unreacted MEG can be recycled.https://www.mdpi.com/2624-781X/3/1/4glycolic acidgold-based catalystmonoethylene glycolelectrodialysisoxidation |
| spellingShingle | Sarah Tschirner Eric Weingart Linda Teevs Ulf Prüße Oxidation of Monoethylene Glycol to Glycolic Acid with Gold-Based Catalyst and Glycolic Acid Isolation by Electrodialysis Reactions glycolic acid gold-based catalyst monoethylene glycol electrodialysis oxidation |
| title | Oxidation of Monoethylene Glycol to Glycolic Acid with Gold-Based Catalyst and Glycolic Acid Isolation by Electrodialysis |
| title_full | Oxidation of Monoethylene Glycol to Glycolic Acid with Gold-Based Catalyst and Glycolic Acid Isolation by Electrodialysis |
| title_fullStr | Oxidation of Monoethylene Glycol to Glycolic Acid with Gold-Based Catalyst and Glycolic Acid Isolation by Electrodialysis |
| title_full_unstemmed | Oxidation of Monoethylene Glycol to Glycolic Acid with Gold-Based Catalyst and Glycolic Acid Isolation by Electrodialysis |
| title_short | Oxidation of Monoethylene Glycol to Glycolic Acid with Gold-Based Catalyst and Glycolic Acid Isolation by Electrodialysis |
| title_sort | oxidation of monoethylene glycol to glycolic acid with gold based catalyst and glycolic acid isolation by electrodialysis |
| topic | glycolic acid gold-based catalyst monoethylene glycol electrodialysis oxidation |
| url | https://www.mdpi.com/2624-781X/3/1/4 |
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