Liquefying Lignins: Determining Phase-Transition Temperatures in the Presence of Aqueous Organic Solvents

Liquefying Lignins: Determining Phase-Transition Temperatures in the Presence of Aqueous Organic Solvents
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液化木质素:测定水性有机溶剂存在下的相变温度

DOI:
10.1021/acs.iecr.1c02044
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发表时间:
2021
影响因子:
4.2
通讯作者:
Thies, Mark C.
Thies, Mark C.
中科院分区:
工程技术3区
文献类型:
--
作者:
Tindall, Graham W.;Temples, Spencer C.;Cooper, Mikhala;Bécsy-Jakab, Villő Enikő;Hodge, David B.;Nejad, Mojgan;Thies, Mark C.

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在适当的温度和溶剂组成条件下,单相含水有机溶剂能够溶解木质素以形成与溶剂相分离的富含木质素的液相,从而产生液-液平衡。当硫酸盐木质素与溶剂甲醇、乙醇、异丙醇和丙酮组合时,这种现象发生的程度被确定,其中在可应用的有机-水组合物的范围内测量固-液(SL)到液-液(LL)的相变温度。从各种生物质来源测试的木质素都被发现与乙醇水溶液形成这种液-液平衡。木质素和经济的绿色溶剂之间的这种相行为的形成为大规模纯化和分馏原料本体(即,技术)木质素。
Under appropriate conditions of temperature and solvent composition, single-phase aqueous organic solvents are capable of liquefying lignin to form a lignin-rich liquid phase separate from the solvent phase, creating liquid–liquid equilibrium. The extent to which this phenomenon occurs when Kraft lignin is combined with the solvents methanol, ethanol, isopropanol, and acetone was determined, with solid–liquid (SL) to liquid–liquid (LL) phase-transition temperatures being measured over the range of applicable organic–water compositions. Lignins tested from a variety of biomass sources were all discovered to form this liquid–liquid equilibrium with aqueous ethanol solutions. The formation of such phase behavior between lignin and economical, green solvents creates new opportunities for the large-scale purification and fractionation of raw bulk (i.e., technical) lignins.
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