Abstract
In order to obtain the high yield of liquid product by hydroliquefaction of a given coal, one of the keys to be resolved lie on how to prescribe for the constitutions of vehicle oil. Recent research at laboratory scale has demonstrated that almost complete conversion of coal to liquid product is achieved with the uses of nitrogen containing-solvent or-fractions derived from coal liquid under relatively mild condition. Basic nitrogen heterocyclic molecules are Lewis base. Those solvents are setting up a hydrogen bond with coal molecules or donating electron pair to form a cordinate bond and results high solubility together with hydrogen transfer during coal liquefaction condition.
In this review, the ability of electron transfer, hydrogen bonding of solvents and coking of solvent are discussed . Capability of hydrogen transfer and synergetic effect of hydrogen donor solvent with high boiling aromatic components are also important for dissolution of coal.
