[Gasification] gasifier charcoal "fuel" - now activating charcoal

[Peter Singfield]

At 07:31 PM 12/7/2006 +0000, AJH wrote:
>On Thu, 7 Dec 2006 13:12:43 -0600 (CST), Peter Singfield wrote:
>
>>So -- envision AD's device on a slightly larger scale.
>
>The device as originally propounded by Yury was on a much larger scale
>
>http://www.repp.org/discussiongroups/resources/stoves/Yudkevitch/charcoal/e
kolon.html
>
>
>AJH

got it and archived it --- thanks.

Way to much for what I plan to be producing though.

Here is an interesting snippet for you all in regards to activating
charcoal -- in this case from pyrolized tires -- but i believe it will work
well for cohune charcoal as well.

Basically -- mix lye and finally powdered charcoal together -- place in a
retort -- heat to 600-900 °C for 0-2 hr in an N2 atmosphere.

(how about just purging with steam well first??)

Peter / Belize

**************appended**********

http://www.awma.org/journal/ShowAbstract.asp?Year=&PaperID=273

 from the November 2000 issue 


Production of Activated Carbons from Pyrolysis of Waste Tires Impregnated
with Potassium Hydroxide


 pdf (members only)

reprints

Hsisheng Teng, Yu-Chuan Lin, and Li-Yeh Hsu, Department of Chemical
Engineering, National Cheng Kung University, Tainan, Taiwan


Abstract:

Activated carbons were produced from waste tires using a chemical
activation method. The carbon production pro-cess consisted of potassium
hydroxide (KOH) impregna-tion followed by pyrolysis in N 2 at 600-900 °C
for 0-2 hr. The activation method can produce carbons with a sur-face area
(SA) and total pore volume as high as 470 m 2 /g and 0.57 cm 3 /g,
respectively. The influence of different parameters during chemical
activation, such as pyrolysis temperature, holding time, and KOH/tire
ratio, on the carbon yield and the surface characteristics was explored,
and the optimum preparation conditions were recom-mended. The pore volume
of the resulting carbons gener-ally increases with the extent of carbon
gasified by KOH and its derivatives, whereas the SA increases with degree
of gasification to reach a maximum value, and then de-creases upon further
gasification.
Implications:

Conversion of waste tires into valuable products through pyrolysis has been
explored by numerous researchers. Reprocessing of the solid residue from
pyrolysis into ac-tivated carbon has been considered to be a profitable way
to do this. In developing the technology, almost all efforts have been
devoted to producing activated carbon through physical activation, a
process that would result in low carbon yield and high energy consumption.
The present work has demonstrated that in the presence of KOH, ac-tivated
carbon can be produced directly from the pyroly-sis of waste tires. Without
the secondary heating required in the physical activation, the production
of activated car-bon through KOH impregnation is very beneficial in terms
of energy saving and emission control. This research can stimulate more
in-depth investigations and other more practical studies on the pyrolysis
of waste tires. 

Copyright © 2000