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Resource utilization of polystyrene waste by preparation of high performance dispersant for coal‒water slurry.

Authors :
He, Qihui
Wang, Xin
Dai, Dongqing
Feng, Yahui
Xu, Renfu
Yan, Jiandang
Wang, Pengfei
Shen, Jian
Hu, Baixing
Source :
International Journal of Coal Preparation & Utilization; 2024, Vol. 44 Issue 7, p920-940, 21p
Publication Year :
2024

Abstract

In present paper, structures and properties of degradation products of polystyrene (PS) waste were characterized by gel permeation chromatography (GPC), thermogravimetric (TG) analysis, Fourier transform infrared (FT-IR) spectroscopy, gas chromatography-mass spectrometry (GC-MS), and thus the degradation conditions including temperature, time, and assistant type and dosage were investigated and optimized. It is suitable to use 1.0 wt% K<subscript>2</subscript>S<subscript>2</subscript>O<subscript>8</subscript> as an assistant to degrade PS waste at 300°C for 24 h. Subsequently by sulfonation and neutralization reactions, the degraded PS was prepared into sodium polystyrene sulfonate (PSS), a common dispersant for coal‒water slurry (CWS). The performance of PSS with different molecular weights and sulfonation degrees was studied. Experimental results showed that the PSS with the sulfonation degree of more than 75%, prepared from the degraded PS having number average molecular weight (M<subscript>n</subscript>) of about 9000, was appropriate for dispersion and stabilization of CWS suspensions. Additionally, compared with commercial dispersant NSF, the obtained PSS had a better performance for CWS. CWSs prepared with dispersant PSS exhibited pseudo-plastic or shear-thinning rheological behaviors. Combined with coal‒water slurry technology, a new approach is provided for resource utilization of PS waste. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
19392699
Volume :
44
Issue :
7
Database :
Complementary Index
Journal :
International Journal of Coal Preparation & Utilization
Publication Type :
Academic Journal
Accession number :
177800347
Full Text :
https://doi.org/10.1080/19392699.2023.2230134