Method for recovering shale oil from shale

Method for recovery of hydrocarbon fractions from hydrocarbon-be

Method for reducing mineral content of sludge

Method for reducing the nitrogen content of shale oil with spent

Method for reforming low grade coals

Method for removal of oxygen from oxygen-containing compounds

Method for treating shale

Method of and apparatus for processing of oil shale

Method of and apparatus for the mixing and processing of fragile

Method of design for vertical oil shale retorting vessels and re

Method of dry distillation of volatile substances from mineral m

Method of effecting highly exothermic reactions

Method of extracting hydrocarbons from oil-containing rock or sa

Method of increasing the oil yield from hydrogenation of coal

Method of liquefaction of carbonaceous materials

Method of liquefaction of carbonaceous materials

Method of liquefying brown coal

Method of operating a wormgear drive at high energy efficiency

Method of operating an oil shale kiln

Method of pre-heating particles of a hydrocarbon-bearing substra