On Sat, 5 Jan 2002 19:51:39 EST, Reedtb2@cs.com wrote:
>
>C H1.4 O0.6 = C 0.6(H2O) H0.2 ==> All the degrees of charcoal in the order
>
>Torrefied wood; Sea Sweep (oil absorbent); Cooking charcoal; mettalurgical
>charcoal; activated charcoal
>
>corresponding to driving off 0.1, 0.2 etc. waters.... at temperatures of
>275; 360; 425; 600 and 800 C.
Thanks for the lesson Tom, I had assumed it was more to do with
cracking of volatilised hydrocarbons, I had not thought of
sublimation.
A quick sum, and I am not a chemist scholar of any sort, suggests that
in order for the 0.2H to leave the system ideally combined as CH4
(else there is a further loss of carbon) then the maximum possible
yield of pure carbon from your typical biomass would be about 40% of
the dry ash free mass out of the actual 52% carbon in the sample.
Otherwise the hydrogen would leave the system as hydrogen gas which
would imply very high temperatures and an endothermic reaction?
AJH
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