Originally posted by andyman: that other dpf article isn't working.
Sorry, it's working for me. It goes to the Triangle Biofuels Blog and is an article that uses the same NREL document as it's source reference as the Oasis Biofuels Post. I like the Oasis Biofuels article a little better as it seems more direct and to the point.
This is some of the most recent research published on biodiesel. To paraphrase the conclusion: Saturated MonoGlycerides are bad bad bad in winter. They have a greater impact, ounce for ounce on cloud point than saturated FAME. When the content of Saturated MonoGlycerides is between 0.01% and 0.03% there can be unexpected filter plugging above the cloud point temperature. And finally, when Saturated Monoglycerides crystalyze, they form an unstable "alpha" crystal structure. when heated, this "alpha" crystal structure changes to a less soluble, stable "Beta" crystal structure and plug up fuel filters.
Mushtaq Ahmad*, Sofia Rashid, Mir Ajab Khan, Muhammad Zafar, Shazia Sultana and Sobia Gulzar Biofuel and Biodiversity Laboratory, Department of Plant Sciences, Quaid-i-Azam University, Islamabad, Pakistan. Accepted 12 December, 2008
I believe the post "titrating accurately" is not exactly correct. The time for a complete neutralization reaction is not mentioned. I reacted potassium hydroxide dissolved in anhydrous isopropanol with stearic acid. After 20 minutes it was still warm indicating an exothermic reaction was still occurring. Titrating the ffa content of vegetable oil has a time and reaction temperature consideration that goes with it. I'm just saying the description of how to do it "accurately" is a little bit wrong. When I titrate the vegetable oil I wait at least 30 seconds before considering that I've added enough titrating fluid. Thanks
The Collaborative Biodiesel Project is a student-led initiative at Appalachian State University. The purpose of the project is to create a closed loop biodiesel processing facility that provides for its own energy needs, and recycles its waste products.