Solvent-refined montan wax (i.e. montan wax from which the resins and asphalts have been removed) was separated into two fractions consisting mainly of esters and acids plus alcohols. The solvent-refined montan wax and the fractions were reacted under coal liquefaction conditions with H2, CO-H2O or N2 at 320 and 405°C. The effects of catalysts (SnO2 for H2 and NaAlO2 for CO-H2O reactions) were also studied, as well as possible catalytic effects of the stainless steel walls of the reactor. All reactions at 320°C gave little conversion to hydrocarbons, but at 405°C significant yields of hydrocarbons were found and these were greater for the reactions with H2 than for those with CO-H2O. The proportion of branched-chain and dimeric hydrocarbons was greater for H2-tetralin than for H2-SnO2 reactions, confirming the ability of tin to hydrogenate free radical intermediates effectively. The stainless steel walls of the reactor were also shown to catalyse the transfer of hydrogen to reactive intermediates effectively, in that use of a glass liner led to a greater proportion of products arising from fragmentation reactions.
- Brown coal
- Montan wax