>Dear Mr. Tom Irwin: >thanks for your prompt replay and valuable information. >I am having a rough time in trying to transesterify tallow using >ethanol and KOH, could you be kind enough and make me any process >suggestions?. >I have tryed: a tallow with ony 2.5% of FFA; 50ºC; 1% KOH; molar >fraction basis , ethanol: tallow 6:1, up to 12 hours and obtained >practically zero reaction ( none visible separation of glycerol out >of gluk). Weird, dont you think?. >Yours truly, >Mr. F.J. Burgos
Not very weird. It's the ethanol that's causing the problems more than the tallow, tallow isn't a problem. With ethanol FFA levels have to be low, less than 1 ml 0.01% NaOH solution titration, and no water content in anything. You probably will not achieve a reliable process without using some methanol at least with the ethanol (which must be absolute). I think ethanol:tallow 6:1 on a molar basis isn't nearly enough. Best wishes Keith >----- Original Message ----- >From: <mailto:[EMAIL PROTECTED]>Tom Irwin >To: <mailto:Biofuel@sustainablelists.org>Biofuel@sustainablelists.org >Sent: Friday, October 21, 2005 10:37 AM >Subject: Re: [Biofuel] best oil to make BD > >Hello Mr. Burgos, > >Animal fat was a natural first choice as we produce a fair amount of >beef here in Uruguay. From my reading on the JTF site, I found that >it was a viable candidate and there are several papers available >there for using it. It made sense from a chemical standpoint as fat >is essentially all saturated hydrocarbon. With only single bonded >carbons I knew that polymerization at temperature is not likely. I >tried about 10 or 15 small batches and never had a single bad batch >with methoxide as a cataylst. Then I shifted to ethoxide and had a >few successes and many failures. I shifted back to methoxide to >check if my technique had gone bad. It hadn't. I still got very good >separation of glycerine and all washed batches passed density, wash, >chemical, and motor testing. I'm currently working on waste >vegetable oil which is extraordinarily variable here. Titration >testing is a must do task with each new supplier and sometimes with >each batch from each supplier but I get the material for free. For >me this is methoxide only territory but I'm still very curious as to >why I had mostly failure but some success with ethoxide. I probably >go back to it once I'm producing enough for my home and farm needs. > >Tom Irwin > > > >From: francisco j burgos [mailto:[EMAIL PROTECTED] >To: Biofuel@sustainablelists.org >Sent: Wed, 19 Oct 2005 19:14:40 -0300 >Subject: Re: [Biofuel] best oil to make BD > >Dear Mr. Tom Irwin: >Did you find by your own experience that tallow is a good raw >material for producing biodiesel? or there is any bibliography that >you can indicate me on the subject?. >Your help will be the most appreciated, thanks in advance. >Cordially, Mr. F.J. Burgos > >----- Original Message ----- >From: <mailto:[EMAIL PROTECTED]>Tom Irwin >To: <mailto:Biofuel@sustainablelists.org>Biofuel@sustainablelists.org >Sent: Wednesday, October 19, 2005 3:39 PM >Subject: Re: [Biofuel] best oil to make BD > >Hello Juan, > >I have found animal fat converts really easy to biodiesel. The main >obstacle is that it is primarily a summer only fuel as it solidifies >at about 10-14 C. A lot depends on what resources you have and your >local climate. If you have a farm with animals that need feed, >perhaps canola (non-GM variety) is a good candidate. It has a good >oil yield per hectare and a reasonably low iodine value. You can >feed the crushed seedcake to your livestock. If you are in a good >sized town or city, waste vegetable oil is usually available from >restaurants. It's quite variable and more difficult to convert than >unused oil but you can usually get it for just your transport costs. >If you live in a poorer area then look for wild castor beans. >They're have large yields and are generally free for the picking but >you can't use the seedcake for animal feed. It composts rather well >for a garden or farm soil amendment. It takes a stronger stomach >than mine to deal with the aroma. Castor oil was once used an an >emetic to cause vomiting. Other I'm sure have their favorites. > >Tom Irwin > > > > >From: Mike Weaver >[mailto:<javascript:kh6k0("new","[EMAIL PROTECTED]")>[EMAIL PROTECTED] >.net] >To: ><javascript:kh6k0("new","Biofuel@sustainablelists.org")>[EMAIL PROTECTED] >nablelists.org >Sent: Tue, 18 Oct 2005 21:28:27 -0300 >Subject: Re: [Biofuel] best oil to make BD > >Free is the best oil to use ;-) > >Juan B wrote: > >>Hello Everyone, >> >>I Would like to know what is the best vegetable oil that can be use >>to get the most biodiesel ? or it would be better to get animal fat? >> >>I looked at the tables in the website but I did not completely understand . >>thanks >>Juan _______________________________________________ Biofuel mailing list Biofuel@sustainablelists.org http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Search the combined Biofuel and Biofuels-biz list archives (50,000 messages): http://www.mail-archive.com/biofuel@sustainablelists.org/
