Acetylene from coal and an electric arc

Alcohols as hydrogen-donor solvents for treatment of coal

Alkylation or acylation of liquefaction product bottoms

Anionic grafts of monomers onto coal substrates

Aqueous alkali depolymerization of coal with a quinone

Ash removal and synthesis gas generation from heavy oils produce

Catalysts and hydrocarbon treating processes utilizing the same

Catalytic hydrogenation process and apparatus with improved vapo

Co-processing of residual oil and coal

Co-processing of residual oil and coal

CO.sub.2 Pretreatment prevents calcium carbonate formation

Coal conversion in the presence of added hydrogen sulfide

Coal deashing process having improved solvent recovery technique

Coal deashing process having improved solvent recovery technique

Coal extraction

Coal extraction

Coal extraction process

Coal extraction process

Coal hydrogenation

Coal hydrogenation in a liquid metallic medium