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A Closed-Loop Process from Microwave-Assisted Hydrothermal Degradation of Starch to Utilization of the Obtained Degradation Products as Starch Plasticizers
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.ORCID iD: 0000-0002-7790-8987
2014 (English)In: ACS Sustainable Chemistry and Engineering, ISSN 2168-0485, Vol. 2, no 9, 2172-2181 p.Article in journal (Refereed) Published
Abstract [en]

A green closed-loop water-based process for chemical recycling of starch was demonstrated. The process starts from microwave-assisted controllable starch degradation to functional chemicals and continues to utilization of the formed degradation products, glucose and levulinic acid (LA), as starch plasticizers. The degradation process and the effect of process parameters on the formed degradation products and residues were carefully fingerprinted by multiple techniques, e.g., NMR, ESI-MS, FTIR imaging, UV-vis, and SEM. The degradation process took place in three steps, proceeding from rupture of starch granules and oligosaccharide formation to further hydrolysis to glucose. Finally, at well-defined time point rapid degradation of glucose to LA and formic acid (FA) was initiated through a 5-hydroxymethyl furfural (5-HMF) intermediate. 5-HMF also participated in carbonization reactions leading to formation of solid carbon spheres. Through selection of processing parameters, LA could be produced in high yield with 9596 selectivity. The results demonstrated that microwave-assisted degradation of starch leads to well-defined controllable degradation products. These products are directly reusable as plasticizers for new starch products, which suggest great opportunities for biomass and starch recycling, opening the door toward potential industrial applications.

Place, publisher, year, edition, pages
2014. Vol. 2, no 9, 2172-2181 p.
Keyword [en]
Hydrothermal degradation, Levulinic acid, Microwave, Plasticizer, Recycling, Starch
National Category
Polymer Technologies
URN: urn:nbn:se:kth:diva-152562DOI: 10.1021/sc500355wISI: 000341229100012ScopusID: 2-s2.0-84906880167OAI: diva2:750618

QC 20140929

Available from: 2014-09-29 Created: 2014-09-29 Last updated: 2015-05-22Bibliographically approved
In thesis
1. Closed-loop strategy for recycling of starch and poly (lactic acid) into new materials
Open this publication in new window or tab >>Closed-loop strategy for recycling of starch and poly (lactic acid) into new materials
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Biopolymers such as starch and poly lactic acid (PLA) can be derived from agriculture and are among the most promising biobased plastics for packaging and other short term application. Considering the growing pressure of environmental safety and limited resources on our planet, it would be beneficial to retain the value of waste products by material recycling. A closed-loop strategy from feedstock recycling of biopolymers to utilization of the obtained degradation products as property enhancers in the same biopolymers was demonstrated in the thesis. 

Place, publisher, year, edition, pages
Stockholm,: KTH Royal Institute of Technology, 2015. 43 p.
TRITA-CHE-Report, ISSN 1654-1081 ; 2015:21
National Category
Chemical Engineering
urn:nbn:se:kth:diva-167353 (URN)978-91-7595-557-5 (ISBN)
2015-06-08, K2, KTH, Teknikringen 28, Stockholm, 10:00 (English)

QC 20150522

Available from: 2015-05-22 Created: 2015-05-21 Last updated: 2015-05-22Bibliographically approved

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