Polymeric dispersants for coal–water slurries

Pawlik, Marek

doi:10.1016/j.colsurfa.2005.04.043

Cited by 76 publications

(50 citation statements)

References 39 publications

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“…Therefore, many studies pertaining to coal water slurry as an alternative fuel replacing petroleum oil in the liquid state have been carried out [1][2][3][4][5]. Coal slurry fuel can be divided into CWS (coal-water slurry), COS (coal-oil slurry), COWS (Coal-oil-water slurry), CMS (coalmethanol slurry), and CMWS (coal-methanol-water slurry) depending on the type of liquid mixed with the solid coal.…”

Section: Introductionmentioning

confidence: 99%

The effect of additive chemicals on the viscosity of coal-petroleum coke-water slurry fuel for a gasification process

Yoon

Choi

Lee

2009

Korean J. Chem. Eng.

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As a preliminary study for the gasification of an anthracite and petroleum coke mixture, viscosity was measured at various temperatures (20-50 o C), slurry concentrations (60-70 wt%) and additive amounts (0-0.8 wt%) by using an LV-II type viscometer. In addition, four types of different additives, sodium naphthalene sulfonate, poly(methyl methacrylate), polypropylene and a polypropylene glycol based additive, were applied to Korean anthracite, petroleum coke and mixtures of these materials, and the viscosity data were compared. Viscosity dependency values for coal, anthracite, bituminous and sub-bituminous coal, were compared, and it was found that a high content of moisture and particularly ash increases CWS viscosity. The four types of additives tested in this research can effectively diminish the viscosity of coal and especially petroleum coke-water slurry by more than 70% to 95%, respectively. Moreover, the sodium naphthalene sulfonate-based additive reduced the viscosity of coal and petroleum coke-water slurry best, especially at concentrations in excess of 65 wt%. Based on these results, highly loaded slurry created by mixing anthracite and petroleum coke with additives was achieved.

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Section: Introductionmentioning

confidence: 99%

The effect of additive chemicals on the viscosity of coal-petroleum coke-water slurry fuel for a gasification process

Yoon

Choi

Lee

2009

Korean J. Chem. Eng.

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“…The adsorption between dispersant and coal particle surface was mainly through hydrogen bonding, electrostatic, and hydrophobic interactions [29]. Functional groups such as hydroxyl, carbonyl, carboxyl and methoxy groups existed on coal particle surface.…”

Section: Zeta Potential Of Coal Particles In Cwsmentioning

confidence: 99%

Biorefinery lignosulfonates as a dispersant for coal water slurry

Qin

Yang

et al. 2016

Sustain Chem Process

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Background: Valorization of lignin from biofuel production is the key to developing biorefinery technologies for sustainable and economic utilization of lignocellulosic biomass. Here we present isolating lignosulfonate from the spent liquors of Sulfite Pretreatment to Overcome the Recalcitrance of Lignocelluloses (SPORL)-pretreated lodgepole pine and Douglas-fir forest residue as a dispersant for coal water slurry. The two SPORL pretreatments were conducted at a pilot scale and resulted in very high ethanol yield from the pretreated biomass. Therefore, demonstrating the commercial utility of these lignosulfonates has practical significance. Main results:The two isolated biorefinery lignosulfonates (LSs), Na-LS and Ca-LS, both had a molecular weight of approximately 9000 Da. Fundamental lignin properties such as chemical structure, functional groups were analyzed. The two LSs showed slightly better to equal performance in modifying CWS rheology than a commercial dispersant naphthalene sulfonate formaldehyde condensate (FDN), despite they were less sulfonated than FDN. Conclusions:The practical importance of this study is that the pilot-scale pretreatments that produced the two LSs also produced excellent bioethanol yields at high titer without detoxification and washing. This suggests SPORL pretreatment is a promising technology for economic bioconversion of under-utilized woody biomass.

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“…CWS, also referred to as coal-water fuel [1,2], has been regarded as a promising fuel instead of petroleum due to the rapid depletion of the latter [3], and many studies on CWS have been carried out in some countries such as China, Japan, America and Australia. A practical CWS as a liquid fuel should have such properties as an appropriate yield value to maintain its stability during storage, a low apparent viscosity for pumping and atomizing, and a high solid content for economical consideration.…”

Section: Intorductionmentioning

confidence: 99%

Synthesis and Properties of Rosin-Based Dispersant for Coal-Water Slurry

Li¹,

Zhang²,

Han³

et al. 2012

Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology (2012)

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Abstract. The main objective of the present work was to synthesize a new type of rosin-based dispersant for Chinese Shenhua coal-water slurry (CWS) and evaluate it's application performances for CWS preparation. In this study, 1.0 generation polyamidoamine (PAMAM) dendrimer with a dehydroabietylamine core, firstly was prepared through Michael addition and amidation, then the rosin-based dispersant was synthesized by the reaction of the dendrimer and chloroactic acid. The formulation and static stability of the slurry with the dispersant were investigated. The experimental results show that the rosin-based dispersant has a good dispersing ability at low dosage, and that the CWS with the dispersant exhibits the excellent static stability. Based on the above, the rosin-based dispersant is a promising dispersant for highly-loaded CWS in the practical use in industry. IntorductionThis paper is concerned with synthesis and application of a new type of rosin-based dispersant for coal-water slurry (CWS) prepared from Chinese Shenhua coal. CWS, also referred to as coal-water fuel [1,2], has been regarded as a promising fuel instead of petroleum due to the rapid depletion of the latter [3], and many studies on CWS have been carried out in some countries such as China, Japan, America and Australia. A practical CWS as a liquid fuel should have such properties as an appropriate yield value to maintain its stability during storage, a low apparent viscosity for pumping and atomizing, and a high solid content for economical consideration.In CWS technology, a dispersant plays a very key role. Many types of the dispersants for CWS have been reported so far, such as naphthalene sulfonates, copolymers of acrylic acid and other acrylic monomers, polyolefin series, lignosulfonates [4], humic acid salts and sulfonated humic acid salts, carboxylic acid salts and phosphate salts, non-ionic dispersing agents, etc.. However, most of the reported additives, synthesized by petroleum, are neither innocuous to the ecosystem nor to the environment. With increasing awareness of environmental protection, the research of natural renewable resources has attracted great attention.Aiming at the existing status, in this study, rosin is used as raw material to prepare the dispersant for CWS, and the modifying reaction increases the hydrophilic property of rosin. The chemical reactions change the molecular structure of rosin thoroughly, and a new type of high-performance rosin series dispersant of CWS can be obtained. To estimate the performances of the synthesized dispersant, in the presence of the dispersant, The CWS from Chinese Shenhua coal was prepared, and the formulation and stability of the slurry with the dispersant were investigated. ExperimentalMaterials. The preparation of CWS was carried out with Chinese Shenhua coal. Table 1 shows the results of the proximate and ultimate analyses of the coal sample.Before the CWS preparation, the coal sample was dry-pulverized in a ball mill to obtain coal powder with the different particle size distribu...

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Polymeric dispersants for coal–water slurries

Cited by 76 publications

References 39 publications

The effect of additive chemicals on the viscosity of coal-petroleum coke-water slurry fuel for a gasification process

The effect of additive chemicals on the viscosity of coal-petroleum coke-water slurry fuel for a gasification process

Biorefinery lignosulfonates as a dispersant for coal water slurry

Synthesis and Properties of Rosin-Based Dispersant for Coal-Water Slurry

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