----- Original Message ----- From: "Dana Linscott" <[EMAIL PROTECTED]> > It appears to me that animal fats become partailly > hydrogenated when passed through hot H2O and can then > be easily removed from the vegoil/anifat mix prior to > filtering. This might make the semi automated > production of BD much simpler.
This is very interesting and would be useful for wintertime BD production. I have separated beef tallow from WVO by filtration through thick cloth. Its a slow and impractical process. The tallow by itself processes well with high levels of NaOH/Methanol. Chilling forms a semi solid at around 15 deg C. So no good for winter use. Thawing reverts it to its liquid state with with no dropout or cloudiness. At present am sourcing WVO (ETA Salfry) containing beef tallow. Had the good fortune to obtain a couple of drums of this oil that had not been contaminated with beef tallow. It produced excellent BD with high viscosity at low temperatures. Unfortunately the supply was limited. Salfry from the current source contains a fair ammount of tallow (yet to determine the ammount). It processes well with high NaOH/Methanol giving a BD which can be chilled to about 5 deg C before solidification becomes a problem. Other feedstocks I have used such as cotton seed oil/tallow have been more temperature sensitive. It depends on what the tallow is contaminating. One possibility for tallow removal would be to use an old twin tub washing machine. The spin bowl could be lined with filter cloth to catch the tallow. For optimum tallow removal the WVO would best be chilled to solidify all the tallow. > Even if the catalyst is expensive it should pay > for itself if it produces BD without the expense of > methanol, etc. With conventional NaOH/Methanol conversion the NaOH plays a dual role. Its primary role is to act as a catalyst. Its secondary role is to neutralise and acidity which is built up in the WVO in use. This acidity would otherwise neutralise and negate the catalytic action of the NaOH. Alternative catalysts would still require methanol for the transesterification reaction which produces BD. Regards, Paul Gobert. www.ozimages.com.au/profile.asp?MemberID=517 ------------------------ Yahoo! Groups Sponsor ---------------------~--> Tiny Wireless Camera under $80! Order Now! FREE VCR Commander! Click Here - Only 1 Day Left! http://us.click.yahoo.com/WoOlbB/7.PDAA/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/
