One-pot selective production of levulinic acid and formic acid from spent coffee grounds in a catalyst-free biphasic system

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This study introduces the catalyst-free production of levulinic acid (LA) and formic acid (FA) from spent coffee grounds (SCGs) as a starting material in a biphasic system of 1,2-dichloroethane (DCE)-water at temperatures above 160 degrees C. In addition to the advantage of using the biphasic system attributed to the product equilibrium, DCE served as a source of hydrogen induced by subcritical water (SCW). The effect of temperature, the amount of DIW and DCE, and the pretreatment on SCG (raw or lipid extracted SCG (LE-SCG)) on the overall reaction and humin formation were studied. The maximum conversion of LA and FA was 47 and 29 w/w% of the total convertible monosaccharides in raw SCGs while 43 and 28 w/w% of the conversion were obtained at 180 degrees C when LE-SCG was used. The solvothermal effects of two media provides a non-catalytic route to utilize undried SCG for the production of LA and FA.
Publisher
Elsevier BV
Issue Date
2020-05
Language
English
Article Type
Article
Citation

BIORESOURCE TECHNOLOGY, v.303, pp.122898

ISSN
0960-8524
DOI
10.1016/j.biortech.2020.122898
URI
http://hdl.handle.net/10203/273805
Appears in Collection
CBE-Journal Papers(저널논문)
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