Benign Fractionation of Lignin with CO 2 -Expanded Solvents of Acetic Acid + Water
Benign Fractionation of Lignin with CO 2 -Expanded Solvents of Acetic Acid + Water
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CO 2 -醋酸水膨胀溶剂对木质素的良性分馏
DOI：
10.1021/acs.iecr.7b02272
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发表时间：
2017
影响因子：
4.2
通讯作者：
Thies, Mark C.
中科院分区：
文献类型：
--
作者：
Klett, Adam S.;Payne, A. Mark;Phongpreecha, Thanaphong;Hodge, David B.;Thies, Mark C.
使用重量比为 90/10 的乙酸/水的 CO2 膨胀溶液，按分子量 (MW) 分级硫酸盐木质素。特别是，当CO2压力从7巴增加到48巴时，液体-溶剂相膨胀并降低其介电强度，木质素分数的MW从15000减少到1250，多分散指数(PDI)值从3.7减少到1.6。回收的木质素部分在化学功能方面是相似的。使用气体膨胀液体（GXL）时，只需要一种溶剂组合物，并且通过压力释放和再压缩促进生物可再生CO2+乙酸水溶液的回收和再利用。该工艺用于回收七种木质素馏分，以证明其多功能性和有效性，但仅回收低MW木质素馏分和高MW木质素馏分的更简单的操作更符合预期应用。
Kraft lignin was fractionated by molecular weight (MW), using CO2-expanded solutions of acetic acid/water in a 90/10 wt/wt ratio. In particular, as CO2pressures were increased from 7 bar to 48 bar, expanding the liquid-solvent phase and reducing its dielectric strength, lignin fractions decreasing in MW from 15 000 to 1250, with polydispersity index (PDI) values decreasing from 3.7 to 1.6, were obtained. The recovered lignin fractions were similar, in terms of chemical functionality. With the use of gas-expanded liquids (GXL), only one solvent composition is required, and recovery and reuse of the biorenewable CO2+ acetic acid–water solution is facilitated through pressure release and recompression. The process was demonstrated for the recovery of seven lignin fractions to demonstrate its versatility and effectiveness, but simpler operation with recovery of just a low MW lignin fraction and a high MW lignin fraction is more consistent with anticipated applications.