My 100 ml of BD (first batch) are now crystal clear after three washings (sort of the colour of sunflower oil, maybe clearer). Might need a filtering just for precaution before using... nothing else.
All my batches come from the same WVO, which hardly titrated to 1.5 ml (pretty cool for used oil). My new 4 liters have separated spectacularly well and the glyc is starting to solidify. BD remains the colour of light tea but amazingly crystal-transparent. Looks are good. I´ll keep in touch. Hopefully I´ll be setting a site up soon at least to post some pictures (a 36 photo roll) Best wishes, Christian ----- Original Message ----- From: "Paul Gobert" <[EMAIL PROTECTED]> To: <biofuel@yahoogroups.com> Sent: Wednesday, April 17, 2002 5:39 PM Subject: Re: [biofuel] Re: Fw: cloudiness (Paul Gobert) > > ----- Original Message ----- > From: "Christian" <[EMAIL PROTECTED]> > [snip] > > > Anyway, if too much lye forms that sticky gel and too little forms a third > > layer of unreacted WVO, then if I only get a layer of glycerine and a > layer > > of WVO, my proportions should be right, right?. > [snip] > Not a definitive guide as to the quality of the BD. > As an example made two batches of BD from some really well used oil. > (More about this oil in a few days when I do more tests, get more > imformation from the distributers.) > The oil titrated at 9.0ml, pretty well used. Tried neutralising some of the > acidity with lime but this oil refused to transesterify after the treatment. > Titration was definitely lower but even using levels of NaOH appropriate for > the titration on the origional oil, the treated oil/ methoxide mix remained > in one phase. > Going back to the origional oil I made two 1L batches. Both used 250ml of > methanol. > Batch A/. 15ml of conc aqueous NaOH added to methanol, Batch B/. 20ml added > to methanol.Shaken in 2L bottle, set aside. In half an hour both batches had > settled nicely. > The origional oil is almost black, BD/glycerine interface difficult to see > in A/., easier to see in B/. (BD in B lighter in colour) > > Yield. A/. 810ml BD, 450ml glycerine. > B/. 710ml BD, 500ml glycerine. > > Glycerine from both batches drained off easily at 25 deg C. > Batch A/. glycerine was still liquid when last seen 6 hours later. > Batch B/. glycerine set after four hours, setting seemed to occur from the > top down even though the beaker was sitting on cold tiles. > From past experience expect both SG and viscosity of Batch B/. to be lower > than that from Batch A/. > > > > And very little whit residue (soap?) is left on top of the glycerine > layer. > > However, the first wash is very dirty (white, milky cloudy almos foamy). > So > > what should I change to get less soap formation? > > Use an oil with less FFA. > Neutralise the FFA in the oil you use. > Titrate your oil and use the ammount of NaOH indicated by the titration. > The oil used here titrated to 12.5g NaOH/litre. > Batch A/. used the equivalent of 12.5g and Batch B/. 16.7g > Better to err on the high hide than the low side especially if you are > processing animal fats or the oil you are using has beef tallow residues in > it. > Use 250ml methanol per litre of oil. > > > Can I wash indefinitely (say, three or four times) to remove all soap? > > By all means. Make sure that your initial washing is not to vigorous though > as it is easy to loose BD through emulsification in the presence of soaps. > Mist washing combined with prolonged settling works well. Usually only the > emulsion layer between the BD and the wash water requires prolonged > settling. > > Would be good to see others have an input to this as these observations are > from processing using conc aqueous NaOH to make the methoxide. > Whilst this method works well for me and the GC results have been > favourable, its not a method which has acheived universal acceptance. > > Accounts of others experiences in these areas would be appreciated. > More on that "Black Oil" later. > > Regards, Paul Gobert. > > > > > Biofuel at Journey to Forever: > http://journeytoforever.org/biofuel.html > 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/ > > ______________________________________________________________________________ mensaje enviado desde http://www.iespana.es emails (pop)-paginas web (espacio ilimitado)-agenda-favoritos (bookmarks)-foros -Chat ------------------------ Yahoo! Groups Sponsor ---------------------~--> Buy Stock for $4 and no minimums. FREE Money 2002. http://us.click.yahoo.com/orkH0C/n97DAA/ySSFAA/FGYolB/TM ---------------------------------------------------------------------~-> Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html 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/
