Effect of addition of surface active agent on the viscosity of a high concentration slurry of a low-rank British coal in water

Aktaş, Zeki; Woodburn, E.T.

doi:10.1016/s0378-3820(99)00059-4

Cited by 77 publications

(38 citation statements)

References 10 publications

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“…Particles of coal sludge were characterized by less variety in the size and were densely packed. Substances which were applied to improve the properties of coalwater suspensions were: Triton X-405 (a condensation product of ethylene oxide with a branched octylphenol, about 40 oxyethylene groups), sodium carboxymethyl cellulose and poly(acrylic acid), partial sodium salt-graft-poly(ethylene oxide), described in the literature [9,1517] as stabilizers used in the production of coalwater suspensions.…”

Section: Methodsmentioning

confidence: 99%

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Analysis of the Process of Coal Micronization Conducted in Order to Obtain Coal-Water Liquids

2014

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Coal is the most important energy source, but its application in traditional way causes pollution. Preparation of coalwater liquids consists of: initial crushing of coal, wet milling in mixer mill and homogenization. To obtain coalwater liquids there were used three kinds of materials: coal of medium assortment with a low content of ash (625 mm), ne coal (020 mm) and coal sludge. The parameters of the grinding process which results in coal water suspensions characterized by the most advantageous functional properties (high stability, low density and viscosity and the smallest equivalent diameter of particles of coal in a slurry) have been chosen and the inuence of additives on the listed properties of the suspensions was determined. For suspensions consisted of water and coal independent parameters were vibration frequency 30 1/s, one ball with diameter of 15 mm and amount of water: 70 wt%. Substances which were applied to improve the properties of coalwater suspensions were: Triton X-405, sodium carboxymethyl cellulose and poly(acrylic acid), partial sodium salt-graft-poly(ethylene oxide). The best stability, low viscosity and the lowest density of the suspensions were characterized by coal, water and 0.1 wt% of carboxymethyl cellulose as a result of the 30 min milling.

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Section: Methodsmentioning

confidence: 99%

“…Some dispersants such as surfactants and electrolytes are used to make coalwater suspensions more stable [9].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Process of Coal Micronization Conducted in Order to Obtain Coal-Water Liquids

2014

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“…Na 2 SO 3 The molecular weight and sulfonic group content are two key factors affecting the dispersity of the dispersant for use in CWS [1] . In this study, the molecular weight and sulfonic group content of ALB were found to be greatly influenced by the Na 2 SO 3 dosage and formaldehyde dosage.Formaldehyde was reacted with Na 2 SO 3 to produce HOCH 2 SO 3 which was engrafted in the ortho-position of phenolic hydroxyl groups by sulfomethylation reaction [10] .…”

Section: B Effects Of Na 2 So 3 Dosage and Molar Ratio Of Hcho Tomentioning

confidence: 99%

“…This study put special stress on the anionic dispersant. Many previous papers have described the various types of anionic dispersants used to obtain CWS with a low viscosity and a high solids fraction [3] . Sodium naphthalene-sulfonate formaldehyde condensate (NSF), as the representative anionic dispersants, is often studied for the preparation of CWS.…”

Section: Introductionmentioning

confidence: 99%

Preparation of a Concentrated Coal Water Slurry Dispersant Incorporating Sulfomethylated Alkali Lignin as a Raw Material

Chen¹,

Liu²,

Liu³

2013

Proceedings of the 2013 International Conference on Remote Sensing,Environment and Transportation Engineering

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Abstract-Dispersants in coal water slurry have received considerable attention over the years with regards to their use in enhancing the properties of CWS. This paper focuses on the preparation of the low-cost, high-performance CWS dispersant. The novel concentrated coal water slurry dispersant was prepared by reacting the sulfomethylated alkali lignin with sulphonated acetone-formaldehyde polycondensate, and the effect of various factors on the dispersion ability was investigated. The results showed that when the H 2 O 2 dosage was 5g, when the molar ratio of CH 2 O to Na 2 SO 3 was 3.4, and when the Na 2 SO 3 dosage was 40%, the apparent viscosity of CWS could reach 1074 mPa•s.

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“…Production of liquid fuels from coal has been successful through direct liquefaction via hydrogenation and by coal gasification as applied in the Fischer-Tropsch process [2]. Simpler and cheaper methods of coal liquefaction in solvents including oil, organic solvents and water have been developed and applied in countries including USA, Russia and China [3,4].…”

Section: Introductionmentioning

confidence: 99%

Influence of Solid Concentration on the Flow Characteristics and Settling Rate of Coal-Water Slurries

Ugwu¹,

Ofomatah²,

Eze³

2013

JENR

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Abstract:Coal-water slurries were prepared with a sub-bituminous coal at varying coal and water ratios using an anionic liquid soap as a surfactant. The slurry properties, viscosity and stability were determined. The rheological properties of the slurries were investigated to ascertain the characteristics of the slurries. The results showed that increasing coal (solid) concentration increased the density of the slurries. Higher density gave rise to more viscous slurries. The behaviour of the slurries changed from Newtonian to non-Newtonian at higher solid concentrations. The slurries with lower solid concentration settled faster than the higher solid concentration slurries.

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Effect of addition of surface active agent on the viscosity of a high concentration slurry of a low-rank British coal in water

Cited by 77 publications

References 10 publications

Analysis of the Process of Coal Micronization Conducted in Order to Obtain Coal-Water Liquids

Analysis of the Process of Coal Micronization Conducted in Order to Obtain Coal-Water Liquids

Preparation of a Concentrated Coal Water Slurry Dispersant Incorporating Sulfomethylated Alkali Lignin as a Raw Material

Influence of Solid Concentration on the Flow Characteristics and Settling Rate of Coal-Water Slurries

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