利用流动反应器进行半纤维素水热梯度提取的研究

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Journal of The Energy Institute Pub Date : 2024-10-03 DOI:10.1016/j.joei.2024.101855
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引用次数: 0

摘要

基于半纤维素组成单元的水热梯度萃取工艺对于获得高质量的半纤维素产品非常重要。为研究萃取模式,使用流动反应器在非等温和等温操作下对锯末半纤维素进行了水热萃取。结果表明,在不同提取阶段,半纤维素单元的主要形式存在显著差异。对于葡萄糖、木糖和半乳糖单元,低聚物形式的选择性随着温度的升高而逐渐降低,而在恒温操作下,低聚物形式的选择性先降低后升高。在两种操作模式下,甘露糖低聚物的选择性先降低后升高,分别在 170 °C 时(96.81%)和 60 分钟时(55.21%)达到低谷。提取的半纤维素分子量主要分布在 70,000 Da 以下,随温度的升高而逐渐降低,但随时间的延长而逐渐升高。这些结果有助于对半纤维素梯度萃取过程的定量和定性认识。
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Study on the hydrothermal gradient extraction of hemicellulose by a flow-through reactor
The hydrothermal gradient extraction process based on the hemicellulose constituent units is important for obtaining high quality hemicellulose products. The hydrothermal extraction of sawdust hemicellulose was performed under both non-isothermal and isothermal operations using a flow-through reactor for investigating the extraction patterns. The results show that there were significant differences in the major forms of hemicellulose units at different extraction stages. For glucose, xylose, and galactose units, the selectivity of oligomeric form decreased gradually with increasing temperature, whereas it decreased and then increased under thermostatic operation. The selectivity of the mannose oligomeric form decreased and then increased in both operation modes, reaching a trough at 170 °C (96.81 %) and 60 min (55.21 %), respectively. The molecular weight of extracted hemicelluloses were mainly distributed below 70,000 Da, and gradually decreased with temperature, but increased with time. The results contribute to the quantitative and qualitative understanding of the hemicellulose gradient extraction process.
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来源期刊
Journal of The Energy Institute
Journal of The Energy Institute 工程技术-能源与燃料
CiteScore
10.60
自引率
5.30%
发文量
166
审稿时长
16 days
期刊介绍: The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include: Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies Emissions and environmental pollution control; safety and hazards; Clean coal technologies; carbon abatement technologies, including carbon capture and storage, CCS; Petroleum engineering and fuel quality, including storage and transport Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems Energy storage The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.
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