MW-assisted hydrothermal liquefaction of spent coffee grounds,The Canadian Journal of Chemical Engineering

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MW-assisted hydrothermal liquefaction of spent coffee grounds
The Canadian Journal of Chemical Engineering ( IF 1.6 ) Pub Date : 2021-07-24 , DOI: 10.1002/cjce.24270
Jie Yang _{1,

2} , Haibo Niu ₁ , Kenneth Corscadden ₃ , Quan He ₁ , Ningning Zhou ₁

Affiliation

Hydrothermal liquefaction (HTL) is an attractive technology to process biomass to biocrude and hydrochar, and most studies have been using batch, tube, or continuous reactors with conventional heating. Attempts on microwave (MW)-assisted HTL (MW-HTL) is limited, and the effect of the heating rate on product distribution remains unexplored. There is also a lack of information on the MW effect in HTL processes. This study focused on the HTL of spent coffee grounds (SCG, most of which are currently disposed of in landfills) under MW irradiation. The investigation on the effect of heating rate revealed that increasing heating rate from 4.5 to 13.5°C/min promoted the biocrude formation and reduced the amount of solid residue. A low feedstock concentration of 8.3 wt.% was favourable for MW-HTL of SCG compared to 14.3 wt.%. At a reaction temperature of 270°C, the biocrude yield gradually increased from 20.9 to 30.1 wt.% in response to an increase in reaction time from 0 to 20 min. In terms of the quality of products derived from MW-HTL, the biocrude exhibited a satisfactory higher heating value (31.3 MJ/kg), and the solid residue, hydrochar, had a high specific surface area of 247.5 m²/g. As for the MW effect, MW and conventional heating resulted in comparable biocrude yield (27.8 vs. 25.7 wt.%, respectively). The characterization of biocrude, hydrochar, and aqueous phase also suggested that MW irradiation had no significant promotion effect on HTL under the experimental conditions in the study.

中文翻译：

MW辅助水热液化废咖啡渣

水热液化 (HTL) 是一种将生物质加工成生物原油和水炭的有吸引力的技术，大多数研究一直使用具有常规加热的间歇式、管式或连续式反应器。对微波 (MW) 辅助 HTL (MW-HTL) 的尝试是有限的，加热速率对产品分布的影响仍未探索。也缺乏关于 HTL 工艺中 MW 效应的信息。这项研究的重点是用过的咖啡渣（SCG，目前大部分在垃圾填埋场处理）在 MW 辐照下的 HTL。对加热速率影响的研究表明，将加热速率从 4.5 增加到 13.5°C/min 促进了生物原油的形成并减少了固体残留物的量。与 14.3 wt.% 相比，8.3 wt.% 的低原料浓度有利于 SCG 的 MW-HTL。在 270°C 的反应温度下，随着反应时间从 0 到 20 分钟的增加，生物原油的产率从 20.9 wt.% 逐渐增加到 30.1 wt.%。在MW-HTL衍生产品的质量方面，生物原油表现出令人满意的较高热值（31.3 MJ/kg），固体残渣水炭具有247.5 m的高比表面积² /克。至于 MW 效应，MW 和常规加热导致相当的生物原油产量（分别为 27.8 对 25.7 wt.%）。生物原油、水炭和水相的表征也表明，在本研究的实验条件下，MW 辐照对 HTL 没有显着的促进作用。

更新日期：2021-07-24

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