Synthesis of a novel amphoteric copolymer and its application as a dispersant for coal water slurry preparation

Du, Lun; Zhang, Guanghua; Yang, Dongdong; Luo, Jie; Liu, Yewei; Zhang, Wanbin; Zhang, Ce; Li, Junguo; Zhu, Junfeng

doi:10.1098/rsos.201480

Cited by 12 publications

(9 citation statements)

References 32 publications

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“…The rheological properties of CWS indicate that the flow characteristics of CWS are in accordance with the Herschel–Bulkley model (

) [ 8 , 36 ]. The fitting results of the experimental data are shown in Figure 6 and Table 4 .…”

Section: Resultsmentioning

confidence: 70%

“…The introduction of carboxyl and sulfonic groups of cellulose can not only connect each monomer closely, but can also serve as the hydrophilic functional group in the dispersant system. This increases the hydrophilic ability of dispersant and resistance to metal ions in coal, making it easier to form a stable hydration film and thus, improving the dispersion stability [ 8 , 40 ].…”

Section: Resultsmentioning

confidence: 99%

“…The extent of ester, as defined by the succiniclic acid content (O-C=O %) and the sulfur content (S%), was measured using an X-ray photoelectron spectroscopy (D/max2500, Bruker AXS, Beijing, China). The DS was calculated according to Equation (1) and Equation (2), as follows [ 8 , 25 ]:

where ω s and ω c are the mass fraction of the sulfonic and carboxyl groups; 122, 102 is the molar quantity of the substituted group; 162 is the molar quantity of a grape unit; 44 is the molar quantity of the O-C=O; 32 is the molar quantity of the S.…”

Section: Methodsmentioning

confidence: 99%

“…The concentration of the dispersant in the solution was determined from the characteristic absorption wavelength according to a predetermined calibration curve. The adsorption amount was calculated as follows [ 8 , 25 ]:

where

is the adsorption amount per unit mass coal (mg·g −1 ),

and

are the initial and final mass concentrations of the dispersant (mg·L −1 ), V is the total volume of the solution (L) and m is the mass of the coal sample (g).…”

Section: Methodsmentioning

confidence: 99%

“…Some dispersants have been commercialized, such as naphthalene sulfonated formaldehyde condensates, sulfonated melamine formaldehyde polymers and the aminosulfonic acid series, etc. They are in the process of synthesis or use may result in undesirable environmental effects, as they can accidentally or intentionally release formaldehyde into the environment [ 4 , 5 , 6 , 7 , 8 ]. Therefore, an environmentally friendly and biodegradable additive is urged to be developed as a new high-performance dispersant for coal–water slurries using cheap and abundant natural renewable resources as raw materials.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Performance of a Novel Cotton Linter Based Cellulose Derivatives Dispersant for Coal–Water Slurries

et al. 2022

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A novel sulfonic-cellulose succinate half ester (S-CSHE) dispersant for coal–water slurry (CWS) was successfully synthesized using cotton linters, sulfamic acid and succinic anhydride in DMF by a one-pot synthesis. The effects of the synthetic condition of S-CSHE as a dispersant for CWS were studied. An S-CSHE with a maximum degree of substitution of 0.98 was obtained under these optimized conditions. The synthesized samples were characterized by GPC, FT-IR spectroscopy, 13C-NMR, and SEM. The molecular weight was from 2.2 × 103 to 1.2 × 104, revealed by GPC; FT-IR spectra analysis revealed characteristic absorptions of the sulfonic-cellulose succinate half ester; SEM images showed smooth cellulose structures, while the S-CSHE had a compact surface. Effects of S-CSHE on the fluidity of application as the dispersants for the CWS prepared from Chinese Zhundong coal were studied further. The CWS application performance investigations showed that S-CSHE can most effectively reduce CWS viscosity, and perform excellent dispersity and stability. When the dosage of S-CSHE was up to 0.5 wt.%, the maximum coal content of CWS may reach 70 wt.%, and the apparent viscosity of CWS was 487 mPa·s. The CWS prepared using S-CSHE (0.38 wt.%) for Zhundong coal showed the rheological characteristics of shear-thinning, and is consistent with the Herschel–Bulkley model. This work found a new route for utilizing cotton linters cellulose and enlarged the selecting range of the dispersant for CWS. It has a positive significance for efficient and clean utilization of Xinjiang Zhundong coal.

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“…The rheological properties of CWS indicate that the flow characteristics of CWS are in accordance with the Herschel–Bulkley model (

) [ 8 , 36 ]. The fitting results of the experimental data are shown in Figure 6 and Table 4 .…”

Section: Resultsmentioning

confidence: 70%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

where

is the adsorption amount per unit mass coal (mg·g −1 ),

and

are the initial and final mass concentrations of the dispersant (mg·L −1 ), V is the total volume of the solution (L) and m is the mass of the coal sample (g).…”

Section: Methodsmentioning

confidence: 99%