Bought Girl Marks manual a few years back. It's great of course. I see she has a new one out that covers some of the more recent subjects and inovations. I wan't to order it but she seems to have dropped off the radar again months ago. I hope she is ok. I know she has health issues. Anybody know if she is currently taking orders? She also travles alot too I know.

Paticularly I want to know about the subjects she mentions for the advanced clases. Can anyone point me to any online articles on those subjects? I tried searching the forums for  Acidulation etc but no luck.

Lots of info here:

 http://www.make-biodiesel.org/tsabrecipes/

This is usefull TY. Turns out i do have some knowledge of chemistry. But people from diffrent places use diffrent words and measurements sometimes. I'm used to doing Tritrations with PH but in the info you linked I see things like:

"React at 48- 54C until titration falls to a minimum hopefully 2.6 ml could take longer than 2 hours. Greater levels of acid will raise the titration end point"

They refrence ml alot in this article. Where i come from ml = Mililiters. Not sure how your endpoint would be in this measurement and not a PH? do they mean Mols per liter?? please help clear this up if you can.

Also where can I read on using acid to reduce your glycerin waste product (aka purification??) I tried searching for Acidulation but couldn't find anything.

1 Last thing. Ecco2Pure. Good product? seems to be popular.

Thanx again

Hi,  I emailed Rick and asked him to jump in.  I think he is talking about the amount of titration liquid needed to make it change color.

 http://www.journeytoforever.org/biodiesel_glycsep.html

I have not used EccoPure.  Thanks, Steve

info from neutral :   http://biodiesel.infopop.cc/eve/forums/a/tpc/f/739605551/m/990600361?r=2101090411#2101090411

Jarrod,

Your probably used to using an xx molar solution for your titrant and then plot ml of titrant vs pH. You know you've reached the endpoint when the slope of the plot is it's most vertical. Most folk getting into biodiesel don't have much of a chemistry background.  Early on, standard chemistry titration procedures were modified to simplify the process for those of us that don't have a chemistry background.

We use a 1% v/w solution of NaOH instead of the traditional 0.1 molar solution of NaOH.  Also the "best" indicator dye is phenolphthalein. We add titrant until we see a color change that persists for at least 15 seconds. The reason for all this change is to eliminate the math.  The ml of titrant we use converts one for one to grams of NaOH needed to neutralize the FFA (and other acids) in one liter of oil. To this we add more NaOH to act as catalyst for the transesterification.

We use the same titration procedure between the acid and base stages to determine when the reaction is complete.

hope this helps

Hey, they don't call him da Tech for nothing ! 

Thanks  for the info and the awesome website !  http://www.make-biodiesel.org/

Yes I get all this. And thanx for typing it all out :)

The part thats throwing me is that they keep talking about "titration of 2.6ml achieved".

If I want to "achieve 2.6ml" then I will just put in 2.6ml :D. Ok obviously thats not right. I don't understand what they are trying to do here.

Are they saying the color will change hopefully at 2.6ml of tritant added? If the oild was not so many FFA wouldn't it take less ml? Wouldn't that be a good thing? If it were realy bad wouldn't there still be a complete conversion? Confused on this point. Just got back into town. Going to read the other post links. Thanx for all your help.

I think your asking about acid /base processing.  In acid processing the acid number will drop over time if you have everything right. They are suggesting that you should perform mulitple titrations during the mixing stage of acid processing. Their "stop processing" trigger is when the results of the titration reaches 2.6ml.

Example Titration before acid stage = 10ml

Titration one hour into acid stage = 7ml

titration two hours into acid stage = 5ml

titration 10 hours into acid stage = 2.6ml  -  STOP ACID processing and start base stage.

Ahhh, So your doing multiple tritrations to drive the reaction and when you get to 2.6 or when your result stops droping you know the reaction went as far as it can?