Hi Darren >Keith, > > You wrote:- > > > Some studies have found that, others not. Some users have found that > > too, others not. It also depends on the oil being used, some > > polymerize much more easily than others. (Biodiesel made from those > > oils will also polymerise, but not as quickly.) It's something of an > > SVO myth that SVO can be produced from decentralized small oil > > expellers - ie straight from the plant. SVO must be refined first, > > including degumming. See "Straighter-than-straight vegetable oils as > > diesel fuels": > > http://journeytoforever.org/biodiesel_SVO-Allen.html > > > >I have recently read a paper > >PURIFICATION OF COLD PRESSED RAPESEED OIL TO USE AS A FUEL >FOR ADAPTED DIESEL ENGINES >E. Remmele 1 , B. Widmann 2 >12th European Conference on Biomass for Energy, Industry and Climate >Protection, 17-21 June 2002, Amsterdam, The Netherlands > >That details the processes used by the 180 or so small scale German oil >mills for production of rapeseed oil fuel. The paper suggests that they >cold press and then either use a filter or a sedimentation process >followed by a safety filter and then the fuel is ready, complying with >the Weihenstephan standard.
... as featured at the excellent VegBurner website at 9 Oil Types and Filtering: http://www.vegburner.co.uk/ Hm, some familiar looking tables there. :-) Anyway... >I guess that the level of production and usage of fuel from these mills >would point to degumming being unnecessary with rapeseed oil? Seems it does contain gum: "Gums compose about 2% of solvent-extracted rapeseed oil (Salunkhe et. al., 1992)." http://www.wsu.edu/~gmhyde/433_web_pages/433Oil-web-pages/Rapeseed1/Ra pe&Canola_oils_1.html And that its removal is necessary: "It has been demonstrated that the use of crude (gum content c. 2%) or degummed crude (gum content of 1.4%, this study) rapeseed oil leads to performance problems including filter blockages and engine coking. Gums are a major precursor of gel formation which becomes particularly problematic at temperatures below 2 ¡C. These problems can be ameliorated by using rapeseed oil which has been degummed to food grade standard (gum content < 0.2 %)." http://www.regional.org.au/au/gcirc/6/214.htm Results of engine and vehicle testing of semi-refined rapeseed oil Best Keith >Darren ------------------------ Yahoo! Groups Sponsor ---------------------~--> Buy Ink Cartridges or Refill Kits for your HP, Epson, Canon or Lexmark Printer at MyInks.com. Free s/h on orders $50 or more to the US & Canada. http://www.c1tracking.com/l.asp?cid=5511 http://us.click.yahoo.com/mOAaAA/3exGAA/qnsNAA/9bTolB/TM ---------------------------------------------------------------------~-> Biofuels at Journey to Forever http://journeytoforever.org/biofuel.html List messages are archived at the Info-Archive at NNYTech: http://archive.nnytech.net/ Please do NOT send Unsubscribe messages to the list address. To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
