[Gasification] Active charcoal

[Darius]

Dear all,

Is somebody  there can help me to convert our char into active charcoal?

Regards,

Darius


On 12/26/2011 12:43 PM, ktwu at itri.org.tw wrote:
> Dear Doug
>
> Thanks for the valuable information.
>
> In the Chinese language, the name of coke and char is the same, called 
> "Jiao Tan".
>
> In a recent paper,
>
> Hosokai, S., K., Norinaga, T. Kimura, M. Nakano, C.-Z. Li, and J. 
> Hayashi, "Reforming of Volatiles from the Biomass Pyrolysis over 
> Charcoal in a Sequence  of Coke Deposition and Steam Gasification of 
> Coke," Energy Fuels, 25, 5387-5393 (2011),
>
> the authors said "tar compounds are converted to *coke* in the 
> micropores of the *char*" (see p. 5390). It is really confused for me.
>
> Happy New Year
>
> KT
> from Taiwan
>
> ________________________________________
> ???: gasification-bounces at lists.bioenergylists.org 
> [gasification-bounces at lists.bioenergylists.org] ?? doug.williams 
> [Doug.Williams at orcon.net.nz]
> ????: 2011?12?26? ?? 02:49
> ???: Discussion of biomass pyrolysis and gasification
> ??: Re: [Gasification] Coke and Char
>
> Hi KT,
>
> You ask some interesting questions:
>
> > What is difference between coke and char?
>
> I believe the problem of identification caused by the English 
> language. Coke is made in a retort from coal, and char is made in a 
> retort from biomass.
>
>  Coke from coal and char from biomass?
>
> Others will give you a more academic answer.
>
> And what's about soot?
>
> I have only worked with soot made in high temperature gasification 
> systems 12-1500>C, and these were studied in 1978 here in New Zealand 
> by Dr J. Cousins. I wrote about these soot in 2008 for our Fluidyne 
> Archive  www.fluidynenz.250x.com<http://www.fluidynenz.250x.com>  
> Scroll down the file list and you will find it 14 from the top.
>
> > According to Franklin's research in 1950s, she mentioned that while 
> the cokes could be graphitized by heat treatments above about 2200 
> deg-C, the chars could not be transformed into crystalline graphite, 
> even at 3000 deg-C.
>
> If I offer a comment it will be conjecture, because the current work 
> being done on our soot and chars is new research, and not published at 
> this time. Having said that, it was these comments that opened up the 
> research, so may offer you a clue to follow your interest.
>
> The soot of interest to me are those that form from volatiles in the 
> unstable chemistry of the sealed retort, which then pass down through 
> the upper boundary reduction zone,
> then the high temperature oxidation, before passing through the 
> reduction at 12-1500C. These are probably those seen in Dr Cousins 
> photos. The remaining char has none of these original volatile carbons 
> present, so no amount of heating will create a crystalline graphite.
>
> Others can provide a qualified answer about coke from coal.
>
> I have a couple of photos that I used  for the presentation of the 
> "Enigma of Gasification" at the Workshop following the IEA 
> Gasification Task Force Meeting in Christchurch in April 2011, that 
> show one of these soot  (C57 O ) for the first time. I will try to get 
> these up on the  Fluidyne Archive as soon as possible, and advise 
> accordingly
>
> Hope this may help.
>
> Doug Williams,
> Fluidyne Gasification. ??????????????,???????,????????????,????????
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