Environmental Impact Evaluation for Heterogeneously Catalysed Starch Oxidation

Tim M. Hoogstad, Stijn M. Timmer, Anton J.B. van Boxtel, Pieter L. Buwalda, Johannes H. Bitter*, Lars Kiewidt

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)

Abstract

Oxidised starch is currently produced from native starch using sodium hypochlorite as an oxidising agent. The use of hypochlorite has undesired side reactions and produces stoichiometric amounts of waste (salt), thus alternative oxidation methods are desired. In this study, the potential of two catalysed starch oxidation methods to reduce the environmental impact (EI) of oxidised starch production are assessed. We compared the EI of oxidation with molecular oxygen (heterogeneously catalysed) and hydrogen peroxide (homogeneously catalysed) to hypochlorite oxidation through life cycle assessment (LCA). The results confirm that hypochlorite oxidation is the main environmental hotspot in the current process of oxidised starch production, and that both hydroperoxide oxidation and molecular oxygen oxidation can significantly lower the EI of the process. The impact reduction is most significant in the categories of freshwater eutrophication (∼67 %), ozone depletion (∼66 %), climate change (35–60 %) and resource use (40 %–78 %) for peroxide and molecular oxygen oxidation, respectively.

Original languageEnglish
Article numbere202200029
JournalChemistryOpen
Volume11
Issue number10
Early online date1 Mar 2022
DOIs
Publication statusPublished - Oct 2022

Keywords

  • anionic starch
  • comparative life cycle assessment
  • environmental impact
  • starch oxidation
  • sustainable chemistry

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