Production of carboxymethylated lignin and its application as a dispersant

被引：111

作者：

Konduri, Mohan K. ^{[1
]}

Kong, Fangong ^{[1
,2
]}

Fatehi, Pedram ^{[1
]}

机构：

[1] Lakehead Univ, Dept Chem Engn, Thunder Bay, ON P7B 5E1, Canada

[2] Qilu Univ Technol, Educ Minist China, Key Lab Pulp & Paper Sci & Technol, Jinan 250353, Peoples R China

来源：

EUROPEAN POLYMER JOURNAL | 2015年 / 70卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Kraft lignin; Biopolymers; Carboxymethylation; Grafting; Charge density; Clay; PHYSICOCHEMICAL CHARACTERIZATION; THERMAL-DECOMPOSITION; OXIDATION; HYDROXYMETHYLATION; SULFOMETHYLATION; FRACTIONATION; FLOCCULATION; ORGANOSOLV; CELLULOSE; STARCH;

D O I：

10.1016/j.eurpolymj.2015.07.028

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Kraft lignin is currently combusted in the pulping process to produce heat. It can be extracted from the process and converted to value-added products, but its limited water solubility hampers its end use applications. The main objective of this study was to investigate the carboxymethylation of hardwood kraft lignin to produce an anionic water soluble product. The results showed that the optimal conditions for carboxymethylation were 1.5 M NaOH concentration, 3 mol/mol sodium chloroacetate (SCA)/lignin ratio, 40 degrees C, 4 h and 16.7 g/L lignin concentration. The produced lignin had a charge density and carboxylate group of 1.8 meq/g and 1.68 mmol/g, respectively. The carboxymethylated lignin was further characterized using thermogravimetric analyzer (TGA), Fourier Transform Infrared (FTIR) spectrophotometer, Nuclear magnetic resonance spectroscopy (H NMR) and elemental analyses. Moreover, the application of carboxymethylated lignin as a dispersant for a clay suspension was successfully analyzed by means of a photometric dispersion analyzer. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：371 / 383

页数：13

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