If you add acid to glyc byproduct to give FFA layer,Glycerol layer,and salt layer,has anyone done anything with the glycerol layer-for example if you check and adjust to make sure the pH is 7 and maybe add some EDTA could it be considered as automotive antifreeze?
I do not see why not-anyone any experience of this or similar?

I have split byproduct, the biggest problem is the salt(sulfate) which seems to stay in the glycerol/water. This might not be a problem as they use salts in anti-freeze as a pH buffer, I don't know which salts are okay though.

Drying the glycerol/water causes the salt to drop out but drying is difficult. If you distilled the glycerol you would get rid of the impurities, but that is also difficult. The pure product has many uses but is probably a bit to valuable to use as anti freeze.

I used strait glycerin byproduct in my deep freeze water setup for my recovery condenser.
I added 4 cubies of glycerin to the 4X3' freezer that was half full of water. It gets a crust of ice on top if I let the freezer go for 2 full days without using it but the water/glycerin mix still flows well. It covers the hoses and uninsulated tee's on my condenser with about a 1/16" of frost that remains there even after running for a 3+ hour WBD recovery...
Not very scientific I know but it definitely lowers the freezing point of the water...
Just dont use the glycerin from a push/pull or WBD like I did at first as it is full of soap and will foam like crazy.
Good luck!
Jon

Thanks for the replies-Like your method for the super cooled condenser water Jon-that would make some wine/beer chiller-a crate at a time(or more)!
I think I'm going to try and split the glyc first-from all my pre-treat stuff my glyc must be full of soap,so I can probably get some FFA to mess about with into the bargain(turbo glyc logs?).The isolated glycerol I will try and neutralize and filter the excess sodium sulphate out(assuming I use sulphuric).Then if I can dry it a bit,more sulphate may drop out-filter again-seems sodium sulphate is considered pretty inert anyway(used in some industrial process to get water out of organic liquids-interesting)Anyway let you know what occurrs.

Has anyone tried acid estrifying the FFA following splitting of the glyc byproduct layer, to make yet more bio from a waste?. When i split the byproduct i had far more ffa's than pure glyc. about 4:1 might be a bit wasteful on the H2SO4, whats the best way to work out how much is needed, i just kept adding it to my sample untill the FFA and glyc layers stopped getting deeper, not the most scintific approach but then it was just an experiment.. Also i'd imagine water production during estrification might be a problem premiturly stalling the reaction, any one found a good way to remove just the water content while etrifying? I thought i'd found a good way with electrolysis but then found it would also strip the hydrogen out of the methanol as well as the water! not so good.

Cineman I have tried making bio out of FFA, it wasn't very successful because of the water. I was getting some conversion but had to keep removing the wet meth and add fresh dry meth. It was going to consume huge amounts meth so I abandoned the idea.
Someone else on this board has suggested using glycerol as the alcohol. Because of it's high boiling point you could boil the water off. You could then process normally.