----- Original Message ----- From: "t_watchornnz" <[EMAIL PROTECTED]> > The SG results form my tests with pre-treated oil are as follows. > Note all are unwashed except for the normal brew sample: > > Test 1, 20 mil (8%) methanol. SG 0.9111 > Test 2, 25 mil (10%) methanol. SG 0.9051 > Test 3, 32 mil (13%) methanol. SG 0.9036 > Test 4, Same as test 2 using another mix of preteat oil. SG 0.9056 > My normal brew using 17% meth and titration + 1.4 grams. SG 0.8946 (snip) SGs all a bit on the low side indicating only partial transesterification.
> What SG number should we be aiming for? (snip) Trevor it depends upon whether you are wanting to sell the BD or just make it for your own consumption. If you are going to sell it it makes sense to conform to standards. International standards range from 0.875 to 0.90 for the DIN E 51606 (German) standard to 0.85 to 0.89 for the ON C1191 (Austrian) standard. (These figures are for tests at 15 deg C). Remember this is on washed BD. Unreacted methanol in unwashed BD will lower the SG unrealistically. > Do you have any info on viscosity measuring? Lacking a commercial viscometer I use a 100ml bulb pipette. The pipette is filled to above the graduation mark with the BD to be tested. A stopwatch is used to record the draining time from when the BD passes the graduation till the discharge changes from a stream to drops. Repeatability of this test is within hundredths of a second. The results act as a guide to relative viscosities of different samples, the only liquids of known viscosity which I have run through it are 20 grade auto transmission fluid and water. SAE 20 auto transmission fluid 130 seconds Water 25.9 secomds Diesel fuel (distillate). 30.3 seconds. waste cottonseed oil 147.3 seconds Used Blended vegetable oil 149.3 seconds. Results from a trial involving set methanol level and variation in NaOH levels. Feedstock waste animal fat (Frytol), titration 2.2ml 0.1% NaOH ie optimum level of NaOH 5.7g/litre. Methoxide, 225ml /litre methanol in all cases. Conc aqueous NaOH solution added to methanol. NaOH levels equivalent to 4.2g/l,4.7,5.2,5.7,6.3,6.8,7.3,7.8,8.3g/litre. Results for washed and filtered product (no heat drying). NaOH SG Viscosity g/L seconds. 4.2 0.8798 37.96 4.7 0.8774 36.89 5.2 0.8745 35.68 5.7 0.8722 35.90 6.3 0.8708 34.86 6.8 0.8697 34.73 7.3 0.8683 34.30 7.8 0.8711 34.48 (experimental error?) 8.3 0.8685 34.11. Regards, Paul Gobert. ------------------------ Yahoo! Groups Sponsor ---------------------~--> FREE COLLEGE MONEY CLICK HERE to search 600,000 scholarships! http://us.click.yahoo.com/iZp8OC/4m7CAA/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/
