Chemical, phase composition and properties of products of thermal decomposition of coal of Tavantolgoy deposit of Mongolia

Abstract

The results of investigation of chemical and phase composition of products of thermal decomposition of hard coal of the Tavantolgoy deposit in Mongolia were presented, namely, the solid residue of thermal decomposition of coal, tar fraction, liquid condensate and organic fraction separated from the condensate. Their compositions, temperatures of formation and phase transformations were determined. Relicts of aromatic hydrocarbons, ester groups and phenols were preserved in a small amount in the solid residue. The boiling condensate is an aqueous solution with a small admixture (~1 %) of the organic component that is the extract and traces of the resinous fraction. Condensate extract mainly contains phenol and its derivatives. The resinous fraction contains low-boiling oils and a phase that is thermally similar to asphaltenes, including up to 70 organic substances, with predominance (~40 % relative) of saturated hydrocarbons (cozanes), the presence of various groups of aromatic and polycyclic hydrocarbons, namely benzene derivatives, naphthalenes, phenanthrenes, hopenes, traces of phenols and cholestenes.