Recent Advances in Direct Coal Liquefaction

Shui, Hengfu; Cai, Zhen-yi; Xu, Chunbao

doi:10.3390/en3020155

Cited by 130 publications

(77 citation statements)

References 73 publications

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“…The presence of these forms of sulphur makes it necessary to install different flue gas scrubbing systems in power generation systems [5][6][7]. Chemical coal cleaning has its dominance over physical cleaning because of its significant reduction in organic sulphur along with the reduction in trace elements [4,8,9].…”

Section: Introductionmentioning

confidence: 99%

High Pressure Oxydesulphurisation of Coal Using KMnO4—Effect of Coal Slurry Concentration, pH and Alkali

et al. 2016

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A high pressure oxydesulphurisation technique was investigated to reduce sulphur content, especially at ambient temperature. Prince of Wales coal was chosen for this study. The focus of the study was on the reduction of both pyritic and organic sulphur. The effects of pressure, coal slurry concentration, pH and KOH concentration in a fixed time interval on sulphur removal were studied with a series of experimental runs at ambient temperature. Heating value recovery was found to be increased with decreased pressure and with increased coal slurry concentration. It was found that sulphur removal was enhanced with an increase in pressure, with a more significant effect on the organic sulphur. With increase in the coal slurry concentration reduction, sulphur was found to be decreased.

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Section: Introductionmentioning

confidence: 99%

High Pressure Oxydesulphurisation of Coal Using KMnO4—Effect of Coal Slurry Concentration, pH and Alkali

et al. 2016

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“…Pre-combustion cleaning has a number of advantages over during combustion or post combustion cleaning techniques [7,8]. Within the pre-combustion cleaning techniques, chemical coal cleaning has its dominance over other techniques because of its significant reduction of sulphur present in the coal matrix along with the reduction in trace elements [6,9,10].…”

Section: Introductionmentioning

confidence: 99%

High Pressure Oxydesulphurisation of Coal—Effect of Oxidizing Agent, Solvent, Shear and Agitator Configuration

et al. 2016

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Abstract:The ambient temperature high pressure oxydesulphurisation technique was investigated to reduce the sulphur content. Prince of Wales coal was chosen for this study. The focus of the study was to investigate the reduction of both pyritic and organic sulphur while changing the KMnO 4 /Coal ratio, agitation speed, agitator configuration, and shear. The effect of different concentrations of acetone as a solvent and effect of particle size on the sulphur removal was also studied by a series of experimental runs at ambient temperature. Heating value recovery was found to be increased with the decreased KMnO 4 /Coal ratio and with decreased acetone concentration. It was found that sulphur removal was enhanced with the increase in shear using a turbine impeller. The effect of particle size was more significant on the pyritic sulphur removal as compared to the organic sulphur removal while heating value recovery was found to increase with decreased desulphurization tome for both, under atmospheric and high pressure.

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“…As coal contains complex chemical structure, an elevated temperature is necessary to aid cracking of coal molecules by thermally rupturing carbon-carbon linkages within coal macromolecular structure [7]. On one hand, high temperature able to break more bonds within coal matrix, thus promotes higher conversion and with usage of an excellent hydrogen donor solvent, more lower molecular weight compound can be obtained.…”

Section: Introductionmentioning

confidence: 99%

Coal liquefaction using a tetralin-glycerol co-solvent system: effect of temperature and reaction time on conversion and product yield

Ali

Ismail

Ishak

et al. 2014

Energy and Sustainability V

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Common solvent used in coal liquefaction, namely tetralin, involves very high costs and thus is less likely to be used. A previous study of Mukah Balingian coal liquefaction showed that tetralin-glycerol solvent system with ratio of 70:30 (v/v) provides the highest coal conversion. In this study, the liquefaction process was carried out using this solvent system. The study aimed to determine the effect of liquefaction temperature and reaction time on coal conversion and percentage of product yield. The experimental work was conducted in a 300ml batchwise reactor system at a temperature of 380-400°C with isothermal reaction times ranging from 15 to 45 min. The reaction pressure was about 4MPa N2, and the solvent-to-coal weight ratio was 10:1. Coal liquefaction conversion to tetrahydrofuran soluble products and percent of product yields were determined and the results were tabulated. Based on the results obtained, conversion of coal increases as the temperature and reaction time being increased with the highest value of 78.55% conversion obtained at 400°C and 45 min reaction time. Increasing temperature also has a significant effect on the percentage of product yield with a higher molecular weight product being produced. Being a temperature sensitive solvent system, increasing reaction time poses different effects on the percentage of product yield for different temperatures used.

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Recent Advances in Direct Coal Liquefaction

Cited by 130 publications

References 73 publications

High Pressure Oxydesulphurisation of Coal Using KMnO4—Effect of Coal Slurry Concentration, pH and Alkali

High Pressure Oxydesulphurisation of Coal Using KMnO4—Effect of Coal Slurry Concentration, pH and Alkali

High Pressure Oxydesulphurisation of Coal—Effect of Oxidizing Agent, Solvent, Shear and Agitator Configuration

Coal liquefaction using a tetralin-glycerol co-solvent system: effect of temperature and reaction time on conversion and product yield

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