>I read the information on dewatering the WVO, but when I was heating >the oil I noticed that when it was taken off the heat and poured off, >that there was water settled on the bottom. Can this be a way to >dewater more quickly? Just heat the oil to 100 deg. C and then pour >the oil off the top? Will water remain suspended in the oil? > >Brent
Removing the water http://journeytoforever.org/biodiesel_mike.html#water Here's another way, from Aleks Kac -- it uses less energy and doesn't risk forming more Free Fatty Acids by overheating. Heat the oil to 60 deg C (140 deg F), maintain the temperature for 15 minutes and then pour the oil into a settling tank. Let it settle for at least 24 hours. Make sure you never empty the settling vessel more than 90%. - From "Biodiesel from waste oil" http://journeytoforever.org/biodiesel_make.html#biodwvo If you heat oil with water in it, stir it or use indirect heat: with direct heat the oil nearest the flame will start popping almost immediately. That can be dangerous: water falling out and collecting at the bottom can get superheated and explode, splattering hot oil everywhere. It usually starts bubbling at around 50-55 deg C, at that temperature the water starts to come out of solution. So keeping it at 60 deg C or a bit higher for a while should precipitate all the water, which settles to the bottom, as you say. No need to heat to 100 deg C, wastes energy, unless you then boil off all the water and start the biodiesel process "on the way down" when it's cooled to processing temp, 55 deg C or whatever, which saves re-heating the oil for processing. Hard to say which is better - if you're using the acid-base process with a much lower-temp first stage, heating to 100 would be a waste of energy. On the other hand some people find heating to 60 and settling doesn't work for them, for some reason. Try both and see what's best for you. What's really best is to try to find a source of high-quality WVO that doesn't contain any water: low-titration oil is usually water-free, and it also means less catalyst, higher yield, and probably quicker washing with less water. We now have two good sources of good oil, constant supply, as much as we want, always about the same, titration less than 1ml, no water. Nice. The stuff we were working with in Hong Kong and Tokyo titrated at 7ml at least, and as high as 10.6ml, yuk, and LOTS of water. But we learnt a lot getting it so we got good production out of that muck. Learnt a lot about which types of restaurants not to eat at too. Best Keith ------------------------ Yahoo! Groups Sponsor ---------------------~--> Free shipping on all inkjet cartridge & refill kit orders to US & Canada. Low prices up to 80% off. We have your brand: HP, Epson, Lexmark & more. http://www.c1tracking.com/l.asp?cid=5510 http://us.click.yahoo.com/GHXcIA/n.WGAA/ySSFAA/FGYolB/TM ---------------------------------------------------------------------~-> Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Biofuels list archives: http://archive.nnytech.net/ Please do NOT send Unsubscribe messages to the list address. To unsubscribe, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
