Technology development for the production of hydrocarbons from fast pyrolysis of kraft black liquor
May 22-27, 2016
A proprietary thermochemical process is being developed for the production of high-value chemicals from black liquor through fast pyrolysis, catalytic upgrading and separation. One critical aspect of the reactor design is to ensure a preferable contacting mode between the liquid droplets and the solid particles so that fine droplets in the feed spray can coat the solid particles as a thin film in order to minimize mass transfer resistance for the pyrolysis reactions, while a fluidizable char with favorable particle size distribution and friability can be produced in the bed. A small portion of the char particles separated by the cyclones may be oxidized in a solids heater to supply the heat required for drying, heating and pyrolysis. The raw pyrolysis gas is upgraded in a catalytic reactor to improve the yields of the preferred products, while the catalyst is regenerated in a separate reactor by oxidizing the coke in a controlled gas environment. The fast pyrolysis process has been successfully demonstrated in a 4” dia. bench-scale fluidized bed pyrolyser, using a dual-fluid spray nozzle for feeding concentrated black liquor. Design considerations of a pilot system are also discussed.
Xuantian Li; Jean Saayman,; Tony Boyd; Chris Chan; Ali Gulamhusein; Jim Wearing; Clive Brereton; Arend Jan Zeeuw; and Bart de Waele, "Technology development for the production of hydrocarbons from fast pyrolysis of kraft black liquor" in "Fluidization XV", Jamal Chaouki, Ecole Polytechnique de Montreal, Canada Franco Berruti, Wewstern University, Canada Xiaotao Bi, UBC, Canada Ray Cocco, PSRI Inc. USA Eds, ECI Symposium Series, (2016). http://dc.engconfintl.org/fluidization_xv/122