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- Title
Effect of membrane purification and concentration of sucrose in sugar beet molasses for the production of 5-hydroxymethylfurfural.
- Authors
Sjölin, Mikael; Sayed, Mahmoud; Thuvander, Johan; Lipnizki, Frank; Hatti-Kaul, Rajni; Wallberg, Ola
- Abstract
[Display omitted] • Pretreatment of sugar beet molasses using membrane filtration. • Full process setup from crude molasses to producing 5-hydroxymethylfurfural. • Pretreated molasses with nanofiltration showed higher reaction rates of sucrose hydrolysis. • Molasses purified with ultrafiltration increased fructose conversion during the dehydration. Production of 5-hydroxymethylfurfural from sugar beet molasses as feed-stock should in theory be a straight-forward process: first, hydrolysis of sucrose, followed by dehydration of fructose, but is in reality challenging. The enzyme-catalysed sucrose hydrolysis is inhibited by impurities and the dehydration of fructose has low conversions. In this study, pretreatment of crude molasses through purification using membrane filtration was investigated. The pretreatment process was evaluated with respect to the sucrose hydrolysis reaction rates and for the downstream 5-hydroxymethylfurfural production. Results from the ultra-/nanofiltration experiments showed good filtration fluxes (11–34 L/m2 h bar), high flux recovery after being heavily fouled (>80%) and ability to purify sucrose. The sucrose hydrolysis results showed an improved reaction rate for nanofiltered molasses (concentrate), while the ultrafiltration permeate showed no major difference from the crude molasses, indicating that the inhibitory compounds are of low molecular weight. Furthermore, the ultrafiltered molasses showed highly efficient fructose conversion (near 100%) and 5-hydroxymethylfurfural selectivity of 57% in the biphasic acid-catalysed dehydration, in contrast to only 49% fructose conversion in the crude molasses.
- Subjects
SUGAR beets; SUCROSE; FRUCTOSE; MOLASSES; MEMBRANE separation; MOLECULAR weights
- Publication
Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers Part A, 2022, Vol 179, p365
- ISSN
0263-8762
- Publication type
Article
- DOI
10.1016/j.cherd.2022.01.007