Open AccessEnvironmental Impact Evaluation for Heterogeneously Catalysed Starch Oxidation
Author(s) -
Hoogstad Tim M.,
Timmer Stijn M.,
Boxtel Anton J. B.,
Buwalda Pieter L.,
Bitter Johannes H.,
Kiewidt Lars
Publication year - 2022
Publication title -
chemistryopen
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 29
ISSN - 2191-1363
DOI - 10.1002/open.202200029
Subject(s) - sodium hypochlorite , chemistry , hydrogen peroxide , starch , hypochlorite , ozone , oxygen , advanced oxidation process , peroxide , environmental chemistry , inorganic chemistry , organic chemistry , catalysis
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.