help with first batch
Did my first batch the other day and got about 4% unreacted with the methanol test.
Did my second batch last night and got about 2% unreacted. So I have been doing more reading and I think my KOH base might be too low, getting conflicting #'s The recipe I was following suggested 5.0 base + titration. The oil I am using titrates very low @ 2.0 25% methanol This is a 4 gallon batch, with paint stir agitation processed for 60 minutes kept between 120-135F. First batch I used 7.0/liter. Second batch I used 8.0/liter. So I have read more and find some other #'s for base using koh. I see 7.0 and 9.0/liter. Looking for complete reaction, but not too much soap(read, easy wash) Any advice appreciated. |
Originally Posted by 72f2504x4390
(Post 8016920)
Did my first batch the other day and got about 4% unreacted with the methanol test.
Did my second batch last night and got about 2% unreacted. So I have been doing more reading and I think my KOH base might be too low, getting conflicting #'s The recipe I was following suggested 5.0 base + titration. The oil I am using titrates very low @ 2.0 25% methanol This is a 4 gallon batch, with paint stir agitation processed for 60 minutes kept between 120-135F. First batch I used 7.0/liter. Second batch I used 8.0/liter. So I have read more and find some other #'s for base using koh. I see 7.0 and 9.0/liter. Looking for complete reaction, but not too much soap(read, easy wash) Any advice appreciated. The KOH that I get is 90%, so I use a base of 8.2/ltr + titration. If your KOH is 90% you should have used 8.2 + 2 for a final figure of 10.2/ltr. 120 deg is to cold, and would require longer mix time. |
I was trying to keep it between 130-140 but I need to watch it a little closer. It was up around 130 for most of the time, but I know it was down in the 120's at one point.
going to try another batch here in a bit. Not sure on the potency of my KOH, got it from braintan.com it doesn't specify the potency. Probably should figure on it being 90% I will use your figures and see how it works out. I am getting close to that figure with trial and error anyway. |
Don pretty much has it covered. I am curious as to how you are determining that amount of unreacted bio out of 3ml.
You may already know this, but if you don't, your 3/27 test needs to be held at 68f for 20 minutes. I usually control temp with a water bath if ambient temps aren't at 68f. Higher temps can give a false pass, whereas colder temps can give a false fail. |
I was using 25ml of bio and 225ml of meth. Basically the same just larger scale. with 25ml, every 1ml of oil=4%
I wasn't paying much attention to temp. My last batch last night using fab's #'s looked pretty bad with the 3/27 test but my methanol was probably 50-55 degrees. Theres so much bad info out there its scary. I wonder how many people just follow directions and never test and just run it. Thanks guys. One more thing learned. I am sure I am not done with the questions. |
I confess, I don't test every batch... Probably should test the next one. Got spoiled by Magnesol, cured a lot of Ill's.
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Thanks guys, I got it goin on now.
Still had problems with my next few batches, figured out I wasn't processing long enough. Bumped up my time from 60 minutes to 90 minutes and it took care of it. Got to get a larger supply of KOH then it will be time to play with Methanol recovery. |
Originally Posted by 72f2504x4390
(Post 8056845)
Got to get a larger supply of KOH then it will be time to play with Methanol recovery.
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