Vacuum-pyrolysis multiple-hearth reactor

Pakdel, H. Roy, C. "Chemical characterization of wood oils obtained in a vacuum pyrolysis multiple hearth reactor." In This Volume. 

Chemical Characterization of Wood Pyrolysis Oils Obtained in a Vacuum-Pyrolysis Multiple-Hearth Reactor... 

PAKDEL ROY Vacuum-Pyrolysis Multiple-Hearth Reactor... 

A limitation of vacuum pyrolysis technology is heat transfer. Previous studies have shown that the rate of heat transfer is essentially the rate limiting step for pyrolysis reactions [2]. Conventional pyrolysis reactors such as multiple hearth furnaces, rotary kilns and screw type reactors exhibit overall heat transfer coefficients ranging from 10 to 60 [3], depending on the type of feedstock handled. The low thermal... 

Processing of Wood Chips in a Semicontinuous Multiple-Hearth Vacuum-Pyrolysis Reactor... 

Several studies have been published describing results from the flash pyrolysis of biomass. Most of these studies were carried out at higher temperatures and were intended to promote biomass gas production. However, the work of Roy and Chornet [4] reported high liquid yields from biomass pyrolysis under vacuum conditions. More recently, Roy et al. [5] have described a vacuum pyrolysis system for the production of liquids from biomass, based on a multiple hearth type of reactor. Knight et al. [6] have developed an upward flow entrained pyrolyzer for the production of liquids from the thermal pyrolysis of biomass. 

The wood oil samples which have been cliaratderi zed in this work have been obtained from pyrolysis of Populus deltoides (clone D-38) with no bark in a multiple-hearth vacuum pyrolysis reactor. The Process Development Unit, Fig. 1, (P.D.U.) has been described in detail by one of the co -authors in another paper (1). 

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