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Hi Anand,<br>
<br>
i think you made a bunch of good ( & cheap) suggestions to
Darius,<br>
Calcium Chloride is probably one of the cheapest ( cheaper and
easier to get the K2CO3),<br>
since it is common used as a deicing salt on roads ( up to -20°C)
and also<br>
in household humidity absorbers ( & odor eliminator) like eg:
<a class="moz-txt-link-freetext" href="http://www.damprid.com/faq#">http://www.damprid.com/faq#</a> ) <br>
but its very hygroscopic, need to be stored dry and in closed
containers,<br>
so i guess you can't soak your biomass in a 25% solution and then
hoping it to dry in the sun<br>
( in an humid climate ), but 5% may do fine.<br>
<br>
<a class="moz-txt-link-freetext" href="http://en.wikipedia.org/wiki/Calcium_chloride">http://en.wikipedia.org/wiki/Calcium_chloride</a><br>
Safety: Calcium chloride can get very hot when mixed ( concentrated)
in water, and the dust is an irritant.<br>
<br>
But there are many sources of material to make charcoal from and<br>
even so many ways to active those carbons.<br>
<br>
My guess is too, that for good activated carbon you need to start
from good char,<br>
that means char made at higher temperatures ( higher temp then
normally needed for bio-char )<br>
800-900 °C. & you like to have low ash content.<br>
<br>
Maybe Darius this may also be of interest to you:<br>
<a class="moz-txt-link-abbreviated" href="http://www.vcharkarn.com/uploads/78/79040.pdf">www.vcharkarn.com/uploads/78/79040.pdf</a><br>
<br>
<a class="moz-txt-link-freetext" href="http://revroum.getion.ro/wp-content/uploads/2010/RRCh_6_2010/Art%2002.pdf">http://revroum.getion.ro/wp-content/uploads/2010/RRCh_6_2010/Art%2002.pdf</a><br>
<br>
Ones you've done the activation step on your AC,<br>
you will not know HOW active your char is, compared to <br>
commercial AC, & that also depends on your purpose for this AC,<br>
so you'll need some testing of the AC.<br>
Here an example of a big lab specific known for his AC testing
service,<br>
with price indication, just you know which kind of test could be
done on it.<br>
<a class="moz-txt-link-freetext" href="http://pacslabs.com/activatedcarbon/actesting.php">http://pacslabs.com/activatedcarbon/actesting.php</a><br>
<br>
An example of analyzing different AC made from bagasse:<br>
<cite><a class="moz-txt-link-abbreviated" href="http://www.waset.org/journals/waset/v34/v34-36.pdf">www.waset.org/journals/waset/v34/v34-36.pdf</a><br>
<br>
</cite>A rather simple but much used test, is the 'iodine number' or
'iodine capacity number',<br>
if you do this on a before and after the activation sample you get a
good impression<br>
of how much more active area has become available.<br>
I guess this can be done on a small budget, and without complex
apparatus.<br>
Here is the ASTM Designation: D4607-94<br>
<a class="moz-txt-link-abbreviated" href="http://www.czsochem.com.cn/download/ASTM%20Iodine%20test.doc">www.czsochem.com.cn/download/ASTM%20Iodine%20test.doc</a><br>
<br>
you may need more tests.<br>
<br>
When we know more of the purpose of your AC, and the scale<br>
of your operation we may be able to give more precise advice &
tips, i guess.<br>
<br>
Grts<br>
Bruno M.<br>
( chemist)<br>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br>
Op 21-2-2012 1:58, Anand Karve schreef:
<blockquote
cite="mid:CACPy7Sdj153XLCe0H1z-hbAKChgmeD7whKzknrD-UMWsrLk+QQ@mail.gmail.com"
type="cite">
<div>Dear Kevin,</div>
<div>this work was done by a graduate student as a project. At
that time he used our charring equipment, but did not tell us
the name of the chemical or its concentration. It was only later
that the Student's guide told me about calcium chloride, when I
met him at a conference. Apparently, one can also use potassium
carbonate. The dry sugarcane leaves were dipped into 5%
solution, removed and dried in the sun. The charcoal was tested
in their laboratory to verify if it was active or not. I don't
think anybody actually makes activated carbon on a commercial
scale by this method. That is why I told Darius that he should
conduct his own experiments and test it. <br>
Yours</div>
<div>A.D.Karve<br>
</div>
</blockquote>
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<blockquote
cite="mid:CACPy7Sdj153XLCe0H1z-hbAKChgmeD7whKzknrD-UMWsrLk+QQ@mail.gmail.com"
type="cite">
<div class="gmail_quote">On Tue, Feb 21, 2012 at 1:14 AM, Kevin <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:kchisholm@ca.inter.net">kchisholm@ca.inter.net</a>></span>
wrote:<br>
<blockquote style="border-left: 1px solid rgb(204, 204, 204);
margin: 0px 0px 0px 0.8ex; padding-left: 1ex;"
class="gmail_quote">
<div bgcolor="#ffffff">
<div><font face="Arial">Dear AD</font></div>
<div> </div>
<div><font face="Arial">Very interesting!!</font></div>
<div> </div>
<div><font face="Arial">Is the charcoal that is activated by
CaCl2 "good for everything that activated charcoal is
good for", or is it perhaps equally good for some tasks,
but not necessarily as good for all?</font></div>
<div> </div>
<div><font face="Arial">What applications have you used the
CaCl2 activated charcoal in?</font></div>
<div> </div>
<div><font face="Arial">What % by weight CaCl2, would you
use?</font></div>
<div> </div>
<div><font face="Arial">Thanks!</font></div>
<div> </div>
<div><font face="Arial">Kevin</font></div>
<blockquote style="border-left: 2px solid rgb(0, 0, 0);
padding-left: 5px; padding-right: 0px; margin-left: 5px;
margin-right: 0px;" dir="ltr">
<div style="FONT:10pt arial">----- Original Message -----
</div>
<div style="FONT:10pt arial;BACKGROUND:#e4e4e4"><b>From:</b>
<a moz-do-not-send="true" title="adkarve@gmail.com"
href="mailto:adkarve@gmail.com" target="_blank">Anand
Karve</a> </div>
<b>Subject:</b> Re: [Gasification] Active charcoal
<div><br>
</div>
<div>Dear Darius,</div>
<div> Normally one needs relatively high temperature to
make active charcoal, but the pretreatment with calcium
chloride allows us to make active charcoal even at
relatively low temperatures. We make charcoal from light
biomass like agricultural waste and use a TLUD type
kiln. You would have to conduct experiments using your
biomass and your process of charring to see if this
pretreatment works in your case or not. <br>
Yours</div>
<div>A.D.Karve<br>
</div>
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<blockquote
cite="mid:CACPy7Sdj153XLCe0H1z-hbAKChgmeD7whKzknrD-UMWsrLk+QQ@mail.gmail.com"
type="cite">
<div class="gmail_quote">
<blockquote style="border-left: 1px solid rgb(204, 204, 204);
margin: 0px 0px 0px 0.8ex; padding-left: 1ex;"
class="gmail_quote">
<div bgcolor="#ffffff">
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<div class="gmail_quote">On Sat, Feb 18, 2012 at 11:01 PM,
Darius <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:darius_tamizi@hotmail.com"
target="_blank">darius_tamizi@hotmail.com</a>></span>
wrote:<br>
<blockquote style="border-left: 1px solid rgb(204, 204,
204); margin: 0px 0px 0px 0.8ex; padding-left: 1ex;"
class="gmail_quote">
<div bgcolor="#FFFFFF" text="#000000">Dear Dr. A.D.
Karve<br>
<br>
Charring material are rubber wood.<br>
Could you tell me the detail process?<br>
<br>
Regards,<br>
Darius<br>
----------------------------------------------------------------<br>
On 2/18/2012 9:56 PM, Anand Karve wrote:
<blockquote type="cite">
<div>Dear Darius,</div>
<div>what material are you charring? We make our
charcoal from leaves of sugarcane, which are
discarded during the process of sugarcane
harvest. By soaking the leaves in 5% solution of
calcium chloride, dying them and then converting
them into char in a TLUD kiln gives us active
charcoal. We have not tested this process in the
case of woody material. Perhaps you can do this
experiment. <br>
Yours</div>
<div>A.D.Karve<br>
</div>
<div class="gmail_quote">On Sat, Feb 18, 2012 at
10:14 PM, Darius <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:darius_tamizi@hotmail.com"
target="_blank">darius_tamizi@hotmail.com</a>></span>
wrote:<br>
<blockquote style="border-left: 1px solid
rgb(204, 204, 204); margin: 0px 0px 0px 0.8ex;
padding-left: 1ex;" class="gmail_quote">
<div bgcolor="#FFFFFF" text="#000000">Dear
all,<br>
<br>
Is somebody there can help me to convert
our char into active charcoal?<br>
<br>
Regards,<br>
Darius<br>
</div>
</blockquote>
</div>
</blockquote>
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</div>
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</blockquote>
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