A process-derived recycle oil is an important feature of a direct coal liquefaction process. The recycle oil is a vehicle to convey coal into the liquefaction reactor. It is a medium for mass and heat transfer among the solid, liquid, and gaseous reactants. It can be a reactant in the process. Because the recycle oil can have a determining effect on process configuration and performance, characterization of its composition and chemistry is of considerable interest. This paper will discuss recycle oil characterization, its influence on the development of coal liquefaction technology, and suggest some future research directions.
展开▼
