Pieter, The answer is simple. You most probably can't using readily available resources.
While you may be able to find some way to bleach and deodorize the glycerin after FFA separation and alcohol removal, you won't be able to improve its purity level unless you distill the glycerin, or at least the water that resides in it. Glycerin boils at over 550* F, conserably less under vacuum, which is the norm in industry but still energy and engineering intense. And then you have to distill the evaporated glycerin. I believe Keith has pointed to a few solvent reclaimers out there. But they run in the thousands and tens of thousands of dollars. Glycerin refining to the degree that you're suggesting is, at the home brewer level, a bit akin to the holy grail. Nobody's "found" it yet. Of course you could always ferment the glycerin and convert it to ethanol. That is if you don't have any particular aversion to working with strains of botulinus. Don't think your neighbors, family, friends or the borough health department would be too thrilled with you though. Todd Swearingen ----- Original Message ----- From: "Pieter Koole" <[EMAIL PROTECTED]> To: <biofuel@yahoogroups.com> Sent: Thursday, June 26, 2003 2:22 PM Subject: [biofuel] Re:To Chris problems sep. glycerine > Thank you Chris, > But what can I do now to get "clean" glycerin ? > I have tried it with different amounts of acid, and a slight separation is > visible, which means that the top layer is very dark and the bottom layer is > very very dark. > > Met vriendelijke groeten, > Pieter Koole > Netherlands. > > ----- Original Message ----- > From: "Christopher Tan" <[EMAIL PROTECTED]> > To: <biofuel@yahoogroups.com> > Sent: Thursday, June 26, 2003 2:50 PM > Subject: RE: [biofuel] Problems sep. glycerine > > > > Pieter, > > > > You might be using too much Sodium Hydroxide. That would explain why the > > sample became very hot when you added Phosphoric Acid. Acid-base > > neutralization is exothermic. That would also explain why you are not > seeing > > a clear separation of FFA. It is because the phosphoric acid that is > > suppose to form FFA is used up in the neutralization reaction thus very > > little FFA is produced. > > > > Chris > > > > =>-----Original Message----- > > =>From: Ken Provost [mailto:[EMAIL PROTECTED] > > =>Sent: Monday, June 23, 2003 6:10 AM > > =>To: biofuel@yahoogroups.com > > =>Subject: Re: [biofuel] Problems sep. glycerine > > => > > => > > =>on 6/22/03 1:36 PM, Pieter Koole at [EMAIL PROTECTED] wrote: > > => > > =>> Hello, > > =>> I am still trying to separate glycerin and FFA's, but > > =>> it does not work. > > =>> Now I used ¸ liter of the bottom layer ( from the very > > =>> bottom of the vessel ) and ¸ liter ( not ¸ ml. but ¸ liter ! ) > > =>> sulphuric acid ( 98% ) and all that happens : no separation. > > => > > => > > =>Wow! Pi liters! I could never measure that close... :-) > > => > > => > > =>> What I see after several hours, is a top layer which > > =>> is about ² of the sample. This top layer is slightly > > =>> lighter in colour than the bottom layer, which is really > > =>> dark / black. > > => > > =>I suspect the top layer is FFA and the bottom is glycerine. > > =>(The FFA layer might even be sort of "reddish". It's also > > =>known as "red oil".) > > => > > =>You're using way to much H2SO4. A good way to see the FFA's > > =>clearly is to dilute a small amount (maybe 100 l) of the > > =>glycerine layer into a liter of water, so the dark color > > =>of the glycerine is completely lost. Then add H2SO4 just > > =>10 ml at a time, stirring 5 minutes each time, until a > > =>dark red layer of FFA starts separating out in globules. > > =>Let it sit a couple hours and all the FFA will be floating > > =>on top. Smells weird..... -K > > => > > => > > => > > =>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/ > > => > > => > > > > > > > > > > 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! 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