[Stoves] Jatropha and its future

[Kevin]

Dear Frank

----- Original Message ----- 
From: "Frank Shields" <frank at compostlab.com>
To: "'Discussion of biomass cooking stoves'" 
<stoves at lists.bioenergylists.org>
Sent: Tuesday, August 23, 2011 4:19 PM
Subject: Re: [Stoves] Jatropha and its future


> Robert, and stovers,
>
> Lots of great info in the link.
>
> One thing I know well from experience is that burning poison oak or poison
> ivy and the toxin is volatile at a temperature before it oxidizes 
> therefore
> in the smoke and very toxic. I wonder the same of phorbolesters?

# The key point here is whether the phorbol esters are:
 a) boiled off, fumed or evaporated,
OR whether
b) they are oxidized partially
OR whether
c) they are oxidized completely to CO2 and H2O

This article http://en.wikipedia.org/wiki/Urushiol indicates that "Poison 
Ivy Oil" boils at about 200-210 C, while this brief article
http://en.wikipedia.org/wiki/Phorbol
indicates that the phorbol compound melts at 250 C. This suggests that it is 
stable up to at least 250 C, at least in the pure form. However, it might be 
destroyed or denatured if heated to a lower temperature, in the presence of 
other materials naturally present in the seed.  Partial oxidation will 
change the initial phorbol esters, but the result will be other compounds 
with unknown properties... these unknown compounds may be worse than the 
initial phorbol esters, or they may be harmless.

# It does not seem responsible to advocate the use of Jatropha seeds as fuel 
until it is clearly known that it is safe to use it as fuel.

# Other interesting articles include:
 http://www.jatropt.eu/index.php/jatropha-curcas-information/36-general/52-phorbol-ester-in-jatropha-a-serious-risk.htmlhttps://jatropha.uni-hohenheim.de/uploads/media/Challenges_and_opportunities_for_using_byproducts.pdfBest wishes,Kevin>> Frank>>>>> Frank Shields> Control Laboratories, Inc.> 42 Hangar Way> Watsonville, CA  95076> (831) 724-5422 tel> (831) 724-3188 fax> frank at compostlab.com> www.compostlab.com>>> -----Original Message-----> From: stoves-bounces at lists.bioenergylists.org> [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of RobertTaylor> Sent: Friday, August 19, 2011 3:25 AM> To: Discussion of biomass cooking stoves> Subject: Re: [Stoves] Jatropha and its future>> Dear Crispin>> This is addressed in the University of Hohenheim (Prof. Makkar) document> linked to by Jan Bianchi in this thread on 18 August:>> http://ec.europa.eu/research/agriculture/pdf/events/4jatropha_en.pdf>> See p. 6.>> Robert>> ----- Original Message -----> From: "Crispin Pemberton-Pigott" <crispinpigott at gmail.com>> To: "'Discussion of biomass cooking stoves'"> <stoves at lists.bioenergylists.org>> Sent: Friday, August 19, 2011 6:04 PM> Subject: Re: [Stoves] Jatropha and its future>>>> Dear Dr AD>>>> What is the approximate gain in mass if the carapace (?) is left inplace?>> People speak of yield of oil per ha but perhaps we should speak of massof>> fuel which would include the whole pod.>>>> Thanks>> Crispin>>>> ++++++>>>> To stovers interested in burning Jatropha seed:>> In nature, Jatropha seed is enclosed inside a capsule. If one is not>> interested in extracting oil from the seed, one need not separate theseed>> from the capsules. The capsules are dry and woody. They may be burned>> along>> with the seed. Burning the capsules together with the seed would save the>> labour of separating the seed from the capsules and would also give more>> fuel per plant.>> Yours>> A.D.Karve>>>>>>>>>> _______________________________________________> Stoves mailing list>> to Send a Message to the list, use the email address> stoves at lists.bioenergylists.org>> to UNSUBSCRIBE or Change your List Settings use the web page>http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org>> for more Biomass Cooking Stoves,  News and Information see our web site:> http://www.bioenergylists.org/>>>> -----> No virus found in this message.> Checked by AVG - www.avg.com> Version: 10.0.1392 / Virus Database: 1520/3853 - Release Date: 08/23/11>