Hello REXIS. The castor oil is highly questionable as a raw material for biodiesel production due to two important issues:: 1) The biodiesel from castor oil will have a too high viscosity well outside the specs. 2) The fatty acids of castor oil are very special and polymerize easily forming heavier compounds while releasing water. Unsuitable ? Yes.
With best regards Jan Warnqvist ----- Original Message ----- From: Rexis Tree To: biofuel@sustainablelists.org Sent: Monday, June 11, 2007 11:54 AM Subject: [Biofuel] Jatropha vs Castor I had did some web study on Castor and Jatropha. Jatropha, being promoted as the perfect biodiesel crop by India, is receiving international highlights and many investors are interested or even start investing in planting this crop. This may spoil the original intension of promoting Jatropha, when large forest was cleared again to make way for Jatropha plantation rather then planting them on the wasteland or marginal land where india planned to do. Castor, the beautiful yet deadly seeds of castor, has been long used as an non edible oil source by mankind, as well as in other industrial application like paint, nylon, food addictive, lubricant, etc. And castor oil is a unuqie oil that it can completely dissolve in alcohol(not too sure what that means, no catalyst needed?). Our focus here is obviously biofuel. About which is the better choice for biodiesel. Similarity: - drought resistance - oily seeds sitable for fuel purpose - seed cake made an excellence manure - poisonious and therefore producing non eatable oil - a kind of weed Jatropha advantage - it is said that Jatropha would trive on all kind of soil even rocky soil - Higher oil yield - it can improve the soil quality Jatropha disadvantage - since it is relatively new crop therefore it was not well understood, and inaccurate yield figure estimation may harm profit, more research and real data required - Jatropha is suitable for India where large area of their land consist of arid wasteland, but may not be suitable to other country like those with lots of rain forest. Castor advantage - Castor oil is one of the oldest traded goods, mankind has been trading castor oil since a few thousand years ago - Castor oil has a lot of industrial usage, therefore a market is already exsistance, thou limited - Since it was cultivated before in commercial plantation, its biology is well understood, and high yield hybrid is available - Castor can be found in medium climate area as an annual crop or in tropical area as a small tree - faster oil yield and long term yield is possible for tropical/warm area Castor disadvantage - It is said that castor will exhaust the soil quickly, fertilizer required to maintain a large castor plantation for a reasonable yield, but castor can often been seen as weed growing without attension, therefore it is possible to plant it as marginal plant in unattended idle area. - it notorious poison is feared by the public, perhaps a research on castor poison(ricin) remedy is necessary. I do not have a conclusion currently, but as you can see, I am trying to open up Castor as an extra option here. Discussion: - Cultivation requirement: Jatropha maybe able to trive on most kind of soil, but I believe that to yield reasonable harvest, irrigation and fertilizer still required. Castor, while the cultivation requirement is better understood then Jatropha, it is still unknown about which one gets better yield if left unattended in a poor condition area, it is possible that each of them will exceed another under specific senarior, intercropping of castor and jatropha also an interesting subject. - Harvesting: it seems like it is more labourious to harvest Jatropha, which its yield grow as scattered fruit, yes, olive harvester can be modified to harvest Jatropha but it will involved high capital. Castor seem to be easier to harvest as its yeild made of a branch of fruit, worker can just cut the whole branch at once. - Toxicity: It seems that castor seeds are much more deadly then Jatropha, its toxic, which was being used in assasination, implies that it is extremely deadly and no remedy avaibale; however castor oil is perfectly harmless due to the fact that the toxic is only water soluble not oil soluble. Jatropha, even though toxic, in some case, was roasted and being eaten dangerously, but note that Jatropha toxic is deadly as well can kill a person by a 5-6 seeds, I am unable to find more articles about its toxicity and remedy about Jatropha here. Both plant is said can be detoxify by simply heating it and thurs destroying the toxic protein, confirmation needed here thou. - Cost: this is also a main factor, the lower input with higher outcome is desired. Any other topics are welcome. Just my 1/2 cents, top up or add on are most welcome. Regards Rexis ------------------------------------------------------------------------------ _______________________________________________ Biofuel mailing list Biofuel@sustainablelists.org http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Search the combined Biofuel and Biofuels-biz list archives (50,000 messages): http://www.mail-archive.com/biofuel@sustainablelists.org/
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