Hydrogenation of Polyesters to Polyether Polyols

The amount of plastic waste is continuously increasing. Besides conventional recycling, one solution to deal with this problem could be to use this waste as a resource for novel materials. In this study, polyesters are hydrogenated to give polyether polyols by using in situ‐generated Ru‐Triphos cata...

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Veröffentlicht in:ChemSusChem Jg. 12; H. 17; S. 4082 - 4087
Hauptverfasser: Stadler, Bernhard M., Hinze, Sandra, Tin, Sergey, Vries, Johannes G.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Germany Wiley Subscription Services, Inc 06.09.2019
John Wiley and Sons Inc
Schlagworte:
Catalysis
Catalysts
Detergent industry
Diols
Hydrogenation
Lewis acid
Polyester resins
Polyethers
polymers
Polyols
Ruthenium
Selectivity
Substrates
sustainable chemistry
waste prevention
ruthenium
sustainable chemistry
polymers
waste prevention
hydrogenation
ISSN:1864-5631, 1864-564X, 1864-564X
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Zusammenfassung:The amount of plastic waste is continuously increasing. Besides conventional recycling, one solution to deal with this problem could be to use this waste as a resource for novel materials. In this study, polyesters are hydrogenated to give polyether polyols by using in situ‐generated Ru‐Triphos catalysts in combination with Lewis acids. The choice of Lewis acid and its concentration relative to the ruthenium catalyst are found to determine the selectivity of the reaction. Monitoring of the molecular weight during the reaction confirms a sequential mechanism in which the diols that are formed by hydrogenation are etherified to the polyethers. To probe the applicability of this tandem hydrogenation etherification approach, a range of polyester substrates is investigated. The oligoether products that form in these reactions have the chain lengths that are appropriate for application in the adhesives and coatings industries. This strategy makes polyether polyols accessible that are otherwise difficult to obtain from conventional fossil‐based feedstocks. Don't hydrolyze, convert: It is possible to convert polyesters in a one‐pot process into polyethers by using an in situ‐generated Ru‐Triphos catalyst in combination with a Lewis acid and molecular hydrogen. This reaction opens up a novel field for polyester recycling and makes polyether polyols accessible that are otherwise difficult to obtain from conventional fossil‐based feedstocks.
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ISSN:1864-5631
1864-564X
1864-564X
DOI:10.1002/cssc.201901210