FeCl3-supported solvothermal liquefaction of Miscanthus in methanol

Ying Su, Bingfeng Guo, Ursel Hornung and Nicolaus Dahmen

Energy, 2022, vol. 258, issue C

Abstract: Solvothermal liquefaction is a technique that could be used to convert biomass into value-added chemicals. Here, Miscanthus was soaked in FeCl3 before solvothermal liquefaction to improve the conversion rate and prevent corrosion of the reactor. Dried Miscanthus (DM), Miscanthus pre-soaked in FeCl3 (MSFe), and Miscanthus with FeCl3 added directly (MAFe) were liquefied in methanol in an autoclave at between 150 and 350 °C. The conversion rates were higher for MSFe and MAFe than DM below 300 °C. At 225 °C, the conversion rate was higher for MSFe (45.1 wt%) than MAFe (36.1 wt%) and more furfural derivatives were produced from MSFe than MAFe. The MSFe and MAFe conversion rates were both ∼70 wt% when supercritical methanol was used. The different liquid products contained similar chemicals (phenol derivatives, furfural derivatives, carbohydrate derivatives, and esters). The derivatives formed through alkylation reactions between intermediates and methanol. Under subcritical conditions, a higher conversion rate was achieved and more value-added chemical derivatives were produced from MSFe than DM or MAFe. This may mainly be because FeCl3 assists in the cleavage of ether bonds by forming chelates with phenolic groups and because pre-soaking creates a concentration gradient in the microenvironment around Miscanthus.

Keywords: Biomass valorization; Solvothermal liquefaction; Miscanthus; FeCl3 pre-soaking; Methanol (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:258:y:2022:i:c:s0360544222018709

DOI: 10.1016/j.energy.2022.124971

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