Sulfobutylated Lignosulfonate with Ultrahigh Sulfonation Degree and Its Dispersion Property in Low-Rank Coal-Water Slurry

Xueqing QiuSchool of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, Guangdong, China;State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, Guangdong, China

Weimei ZengSchool of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, Guangdong, China;State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, Guangdong, China

Wanshan LiangSchool of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, Guangdong, China;State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, Guangdong, China

Yuyuan XueSchool of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, Guangdong, China;State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, Guangdong, China

Nanlong HongSchool of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, Guangdong, China;State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, Guangdong, China

Yuan LiSchool of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, Guangdong, China;State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, Guangdong, ChinaCorrespondence[email protected]

Abstract

Using a simple method, we developed a new family of alkyl sulfonic acid modified lignosulfonate (ASLSs) with simultaneously improved sulfonation degrees and molecular weights via one step. Direct sulfonation occurred on both phenolic and alcoholic hydroxyl groups of alkali lignin raw material with 1,4-butylenesulfone used as sulfonation agent. A sulfonation degree of 3.86 mmol/g had been achieved which presents as one of the highest sulfonation degrees among those of reported LSs, to date. ¹H-NMR and Fourier transform infrared spectroscopy measurements confirmed the efficient sulfonation. Furthermore, the dispersion properties were investigated in low-rank coal-water slurry (CWS). ASLS3 showed better viscosity-reduction effect than naphthalene sulfonate formaldehyde condensate (FDN) in CWS with dosages from 0.6% to 1.0 wt%. ASLS3 had the similar sulfonation degree with FDN; however, the large steric hindrance, soft long alkyl chain-C₄H₈-SO₃H, and their efficient anchoring effect of ASLSs contributed to their improved dispersion properties.

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Sulfobutylated Lignosulfonate with Ultrahigh Sulfonation Degree and Its Dispersion Property in Low-Rank Coal-Water Slurry

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Sulfobutylated Lignosulfonate with Ultrahigh Sulfonation Degree and Its Dispersion Property in Low-Rank Coal-Water Slurry

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