Lignin fractionation from waste wood using organosolv treatmentcombined with membrane filtration

IF 0.8 4区工程技术 Q4 ENGINEERING, CHEMICAL

Membrane Water Treatment Pub Date : 2020-01-01 DOI:10.12989/MWT.2020.11.1.025

H. Cho, Minjeong Lee, Jingyeong Shin, Eun-sik Kim, Young Mo Kim

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引用次数: 2

Abstract

The purpose of this study was to investigate the characteristics of lignin fractionated from waste wood (WW) using a two-step process of ethanol organosolv pretreatment followed by ultrafiltration with membranes of different molecular weight cut-offs (1, 5 and 20 kDa). The different permeates obtained were characterized by fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR), thermogravimetric analysis (TGA) and gel permeation chromatography (GPC). The analysis by FT-IR and NMR of these lignins showed that the lignin core was successfully separated from WW. TGA curves confirmed that the thermal properties of lignin fractionated by ultrafiltration were almost identical to each other. The results from GPC confirmed that fractionating of lignin was achieved by ultrafiltration. For the membrane fractionation process, values of molecular weight decreased as the cut-offs used to obtain the fractions became smaller. As a result, fractionating lignin by a two-step process allowed separating different fractions of lignin of different molecular weights yielded high purity without interference from existing pollutants in WW. The two-step process offers the possibility of using fractionated WW as an untapped source of lignin.

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有机溶剂-膜过滤法分离废木材中的木质素

本研究的目的是研究用不同分子量(1、5和20 kDa)的膜对废木材(WW)进行乙醇有机溶剂预处理-超滤两步法分离木质素的特性。采用傅里叶红外光谱(FT-IR)、核磁共振(NMR)、热重分析(TGA)和凝胶渗透色谱(GPC)对所获得的不同渗透产物进行了表征。FT-IR和NMR分析表明，木质素核成功地从WW中分离出来。TGA曲线证实，超滤分离得到的木质素热性能基本相同。GPC实验结果证实了超滤对木质素的分离作用。对于膜分离过程，分子量值随着用于获得馏分的截止值变小而减小。因此，通过两步法分离木质素，可以分离不同分子量的不同木质素组分，纯度高，不受WW中现有污染物的干扰。两步工艺提供了使用分馏WW作为木质素未开发来源的可能性。

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来源期刊

Membrane Water Treatment ENGINEERING, CHEMICAL-WATER RESOURCES

CiteScore

1.90

自引率

30.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Membrane and Water Treatment(MWT), An International Journal, aims at opening an access to the valuable source of technical information and providing an excellent publication channel for the global community of researchers in Membrane and Water Treatment related area. Specific emphasis of the journal may include but not limited to; the engineering and scientific aspects of understanding the basic mechanisms and applying membranes for water and waste water treatment, such as transport phenomena, surface characteristics, fouling, scaling, desalination, membrane bioreactors, water reuse, and system optimization.