Hi, i read your Biodiesel tutorial under it "Advance Biodiesel"- Electrostatic separation. My question is in the schematic diagram what is the secondary voltage? and what output do i need is it AC or DC?

thanks, so the transformer is a step-up. i was confused because the link shows voltage doubler, voltage quadrupler and this is a pulsating DC voltage.
I try to make biodiesel using 30ml ethyl alcohol, heated 100ml wvo , 1g caustic soda. while pouring the heated wvo into the ethyl and caustic soda bubbles appear and the mixture turns to solid with some patrs in white color. i add 20ml of ethyl thinking lack of ethyl , reheat, stir and mixture turns back to liquid. set aside waiting what will happen. 2nd try 60ml of ethyl, 100ml wvo no heating, 1g caustic soda. same procedure. while pouring the wvo into the ethyl and caustic soda solution the ethyl looks not combining with the wvo even i stir slowly. you can see the separation on top the ethyl colorless and at the bottom wvo dark color. i stir more faster then the wvo and ethyl combined. but after stirring 1 or 2 minutes it turns into gel. i try to stir again some parts turns to white color. i removed the white color add 20ml ethyl and reheat, it go back to liquid. set aside for settling.

i did not tritrate my wvo because i cannot find the PH solution here in our country like phenolphthalein ,turmeric or phenol red i only find litmus paper and ph strips type i dont know if this one will work what do you think?the ethyl purity is also unknown. i use deodorized ethyl alcohol this is the one i used in making perfume. i did not test the wvo for water content, how to test it? is heating the wvo is not enough to removed water?thanks for the info. ragards.

My experiments with electrostatic separation (years ago) used a 7.5KV DC power supply. The glycerin/soap were attracted to the brass strip I hung in the PLASTIC barrel, sliding off into the depths of the barrel as I watched. It was amazing and rather scary. 7500 volts without protection should scare people. It's an advanced technique that I think needs to wait for a while. You need to learn basic (no pun intended) biodiesel processing first.
If you can't do titrations with phenolpthalein, then I see no other options to doing mini-batches. Let us know if you need help. We're here to do so.
Cheers,
JohnO