Effect of initial coal particle size on coal liquefaction conversion

Influence of coal properties on coal conversion processes-coal carbonization, carbon fiber production, gasification and liquefaction technologies: a review

“…The FTS process uses synthesis gas from the gasification process and converts it into liquidous hydrocarbons and associating oxygenated compounds using different catalysts from Group VIII. The product mixture depends on the carbon monoxide to hydrogen ratio (Berkowitz 1979;Durie 1982;Höök and Aleklett 2009;Khan 2011;Vasireddy et al 2011;Heydari et al 2016;Miller 2017).…”

“…The high yields by liptinites is due to the presence of Durie (1982), Vasireddy et al (2011), Singh et al (2013) Particle size Decreasing the particle size increased the total conversion of coal into liquid products. With reduced particle size the solvent molecule had less distance to penetrate into the coal particle for extraction of products Neavel et al (1981), Giri and Sharma (2000), McMillen and Malhotra (2006), Li et al (2008a, b), Heydari et al (2016) Influence of coal properties on coal conversion processes-coal carbonization, carbon fiber… aliphatic structures while the inertinites simply remain inert during a conversion process (Saxby and Shibaoka 1986;Bertrand 1989;Hunt 1991;Newman et al 1997;Peters et al 2000;Sykes 2001;Suarez-Ruiz and Crelling 2008;Singh and Mrityunjay 2018a, b). Generally, for coal to be considered suited for liquefaction, its organic matter should be 10% to 20% Type I kerogen or 20% to 30% with Type II kerogen (Powell and Boreham 1994).…”

“…The free radicals result in products with stable high molecular weight being formed which is undesirable during liquefaction (Schlosberg 1985;McMillen and Malhotra 2006;Li et al 2008a, b). Extraction yields have been found to be more for small sized particles as they provide increased coal surface area and enhance the ability of the solvent to easily penetrate into the coal structure hence an increment of yields (Giri and Sharma 2000;Heydari et al 2016).…”

“…Pyrite and alumino-silicates exert a catalytic effect during coal hydrogenation. Furthermore, the mineral matter can be detrimental on the equipment used for liquefaction by formation of scale and deposits on the reactor walls and can lead to blockage problems due to formation of compounds like calcium carbonate adversely affecting the reactor capacity (Durie 1982;Heydari et al 2016).…”

Thermal Drying Methods on Coal Liquefaction Conversion

“…According to some estimates, nearly fifty percent of the coal resources of the world are low rank coal, such as lignite coal. Lignite coal is plentiful in Canada and plays a significant role in power generation (Heydari et al, 2016). Especially for low rank coals such as lignites with high moisture content, treatment of these coals by different drying techniques can improve coal liquefaction conversion.…”