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Ternary System of Pyrolytic Lignin, Mixed Solvent, and Water: Phase Diagram and Implications

机译:热解木质素,混合溶剂和水的三元体系:相图和含义

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摘要

Bio-oil from biomass fast pyrolysis is considered to be an important feedstock for the production of renewable fuels and green chemicals. Fast pyrolysis bio-oil generally contains a water-soluble fraction (excluding water), a water-insoluble fraction (i.e., pyrolytic lignin, PL), and water in a single phase. However, phase separation can occur during bio-oil transport, storage, and processing. In this study, a mixed solvent (MS) is developed based on the compositions of various fast pyrolysis bio-oils produced from a wide range of feedstocks and reactor systems. Experiments are then carried out to investigate the phase behavior of the PL/MS/water ternary system. Several ternary phase diagrams are constructed for PL and its fractions, and the PL solubilities in various MS/water mixtures are also estimated. Under the experimental conditions, the PL solubility in the MS is high, i.e. similar to 112 g per 100 g of MS. In the PL/MS/water system, an increase in water content to similar to 17 wt % in the MS/water mixture leads to a slight increase in the PL solubility to a maximal value of similar to 118 g per 100 g of MS/water mixture, followed by a gradual decrease in the PL solubility when the water content further increases. It is found that the phase stability of the PL/MS/water system is strongly determined by the composition of the system. For example, the PL/MS/water system is always stable when the MS content is 50 wt %, while the system is always phase-separated when the PL content is 54 wt %. A comparison of the results for various PL fractions indicates that the molecular weight of PL can affect the ternary phase diagram, with the PL of a lower molecular weight having a higher solubility in the same MS/water mixture. The presence of free sugar (i.e., levoglucosan, present in bio-oil as solute) also influences the ternary phase diagram of the PL/MS/system, but only at a low water content (i.e., 20 wt %). The results suggest that such ternary diagrams may be potentially an important tool for predicting the phase separation of bio-oil, as a result of changes in the bio-oil chemistry in various processes (e.g., cold-water precipitation and aging).
机译:生物质快速热解产生的生物油被认为是生产可再生燃料和绿色化学品的重要原料。快速热解生物油通常在单相中包含水溶性馏分(水除外),水不溶性馏分(即热解木质素PL)和水。但是,在生物油的运输,储存和加工过程中可能会发生相分离。在这项研究中,基于由多种原料和反应器系统生产的各种快速热解生物油的成分,开发了一种混合溶剂(MS)。然后进行实验以研究PL / MS /水三元系统的相态。构建了PL及其馏分的三元相图,并估算了在各种MS /水混合物中的PL溶解度。在实验条件下,PL在MS中的溶解度很高,即与每100 g MS 112 g相似。在PL / MS /水系统中,MS /水混合物中水含量的增加大约为17 wt%,导致PL溶解度略有增加,最大值为每100 g MS / 118类似于118 g与水的混合物,然后当水含量进一步增加时PL溶解度逐渐降低。发现PL / MS /水系统的相稳定性强烈取决于系统的组成。例如,当MS含量> 50 wt%时,PL / MS /水系统始终稳定,而当PL含量> 54 wt%时,系统始终是相分离的。各种PL馏分的结果比较表明,PL的分子量会影响三元相图,较低分子量的PL在相同的MS /水混合物中具有较高的溶解度。游离糖(即生物油中以溶质形式存在的左旋葡聚糖)的存在也影响PL / MS /系统的三元相图,但仅在低水含量(即<20 wt%)时才会发生。结果表明,由于各种过程中生物油化学变化(例如冷水沉淀和老化),这种三元图可能是预测生物油相分离的潜在重要工具。

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  • 来源
    《Energy & fuels》 |2018年第1期|465-474|共10页
  • 作者单位

    Curtin Univ, Dept Chem Engn, GPO Box U1987, Perth, WA 6845, Australia;

    Curtin Univ, Dept Chem Engn, GPO Box U1987, Perth, WA 6845, Australia;

    Curtin Univ, Dept Chem Engn, GPO Box U1987, Perth, WA 6845, Australia;

    Curtin Univ, Dept Chem Engn, GPO Box U1987, Perth, WA 6845, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-18 00:39:05

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