Didn't we process a batch from the same resturante that was good (ie. a later date)? I thought we did that during class. And you were mentioning how unusual it was that you had this bad oil from a formerly good source. Had the bad oil experience, then went back and tested again and it was good oil again? I guess this is why you say to bring a titration test kit when "hunting" oil. ;-)
What your saying is really logical, that something acidic either got mixed in or rooting food caused and acidic condition. Dunno, although a scenario might be they just tossed some bad vinager/acidic crap in the bin. Operator error is usually the cause in computer stuff, so why should it be any different with a resturante? James Slayden On Tue, 26 Nov 2002, girl mark wrote: > This brings up a question I';ve had for a while- > > are there other acids besides ffa, that are not water-soluble and are > found > in oils? > > We had some particularly terrible oil that titrated at 13 ml, and I just > couldn't bring myself to believe that it was ffa causing the high values > in > the titration, as that restaurant always had decent oil before that > particular sample. I tried doing what you're describing- washing the oil > and pH testing the wash water and also re-titrating the oil layer to see > if > the acidity was something caused by water-solubles (vinegar from cooking, > or acids from food rotting), and it seemed that it was still something > insoluble, presumably ffa. > thoughts? > mark > > > > > > At 01:21 AM 11/27/2002 +0000, you wrote: > >The problems of quality of homebrew or commercial for that matter > >never seem to go away. As much as I would like to pretend that our > >bio is perfect, I want to share the latest of ours problems with the > >group in the hope that some one may benefit. I got a call that the > >fuel from the storage tank had clogged the filter on Tony's crane > >truck. Not with algae but with "grease". Bear in mind that it been > >over 30°C. I went over the process that Tony had been using. We had > >been concentrating on fine tuning the separators to continually > >remove the glycerol as it formed, the fuel was completely reacted and > >the temperature was over the melting points of our longest fatty acid > >esters. The problem had to come from the washing. Now washing is a > >brutal affair compared with bubble washing and getting the emulsion > >to break involves acidifying the water(slightly I would have hoped.). > >I ran some thick "cream" from the bottom drain of the storage tank > >and tested it for FFA's by mixing with neutral water and titrating > >the layers. The water remained neutral but the "oil" took ¾ ml of > >standard NaOH . I deduced that I was dealing with FFA's not an > >inorganic acid. After performing a number of trials using acid > >catalysis and the three alcohols on hand. I found that the controls > >using alcohol alone reduced the acid number and clarified the > >product. Addition of < 5% of methanol without the addition of > >Sulphuric clarified the goop within 30 minutes at ambient > >temperature. > >We modified the post washing stage . Drying was achieved by heating > >the fuel to 115° while pumping from the bottom and spraying over > >the "open" top. As the dry fuel cooled to <60°C 2% methanol was added > >and the lid closed for recirculating. Once cool, ~30°C, this fuel was > >pumped across to the storage vat. I have neglected research on the > >washing stage, hopefully we can shorten this step as well. When the > >separators work well a 200l batch can be reacted and separated to > >completion in under an hour. I believe that the separators would have > >to spin much faster to be of use in post-wash separation. I have > >designed a simple vertical centrifuge to take the place of the dairy > >separators. If I get around to building it I'll post the results. > > > > > > > >Biofuels at Journey to Forever > >http://journeytoforever.org/biofuel.html > >Biofuel at WebConX > >http://webconx.green-trust.org/2000/biofuel/biofuel.htm > >List messages are archived at the Info-Archive at NNYTech: > >http://archive.nnytech.net/ > >To unsubscribe from this group, send an email to: > >[EMAIL PROTECTED] > > > > > > > >Your use of Yahoo! Groups is subject to > http://docs.yahoo.com/info/terms/ > > > Biofuels at Journey to Forever > http://journeytoforever.org/biofuel.html > Biofuel at WebConX > http://webconx.green-trust.org/2000/biofuel/biofuel.htm > List messages are archived at the Info-Archive at NNYTech: > http://archive.nnytech.net/ > To unsubscribe from this group, send an email to: > [EMAIL PROTECTED] > > > > Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. > 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/
