1. B. Gross, M.P. Ramage, FCC reactor with a downflow reactor riser, U.S. Patent 4,385,985 (1983).
2. B. Gross, Heat balance in FCC process and apparatus with downflow reactor riser. U.S. Patent 4,411,773 (1983).
3. P.K. Niccum, D.P. Bunn, Catalytic cracking system, U.S Patent 4,514,285 (1985).
4. Application of phosphor tracer technique to the measurement of solids RTD in circulating fluidized bed;Wei;J. Chem. Ind. Eng. China (Chinese Edition),1994
5. Cocurrent downflow circulating fluidized bed (downer) reactors—a state of the art review;Zhu;Can. J. Chem. Eng.,1995