期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 3, 期 6, 页码 1172-1182出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.5b00098
关键词
Kraft lignin; Sulfomethylation; Sodium sulfite; TGA; Charge density; FTIR; Solubility
资金
- NSERC
- Canadian Foundation for Innovation (CFI)
- Canada Research Chair program
- FPInnovations
Kraft lignin can be extracted from black liquor (i.e., spent liquor) of a haft pulping process to produce value-added chemicals, but its limited water solubility hampers its end-use applications. The main objective of this study was to investigate the sulfomethylation of haft lignin to produce water-soluble haft lignin with an anionic charge density. In this work, hardwood haft lignin was modified with formaldehyde and sodium sulfite under alkali conditions. The optimum conditions for sulfomethylation were 0.5 M NaOH(aq), 0.9 mol/mol sodium hydroxymethyl sulfonate/lignin at 100 degrees C for 3 h, and 20 g/L lignin concentration. The resulting lignin had a charge density of -1.60 mequiv/g and sulfonate group content of 1.48 mmol/g. The molecular weight, structure, thermal behavior, and elemental analyses of the product were also assessed. The modified lignin was used as a cement dispersant, and the dispersibility of cement was increased from 60 to 155 mm by adding 1.2 wt % of sulfomethylated lignin to cement. Unmodified lignin did not change the dispersibility of cement.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据