A method and apparatus for converting, i.e. hydrogenating, dry particles of coal with hydrogen to give hydrocarbons such as engine or heating fuels. The invention combines together several steps in the hydrogenation process, such as compressing the dry coal, heating, plasticizing and hydrogenating, in...http://www.google.ca/patents/US4344836?utm_source=gb-gplus-sharePatent US4344836 - Method for converting coal to hydrocarbons by hydrogenation
