Jan,
You wrote:
"The limit of FFA for a flawless trans-esterification is drawn at 5mg
KOH/g of oil. Any value above will demand pre-treatment of the oil."
I have been blending the WVO I collect -----> titration of 2 - 3 g of
90%KOH/L. I recently ran a 76L batch of poor quality WVO . It titrated at
5.5g of 90%KOH/L. For the first time in months, the BD I produced failed the
methanol quality test .... not bad, but there were tiny buggers that did
not dissolve.
I have been troubled by the failed test. I have never used WVO that
titrated above 4g 90% KOH/L.
1. Is it reasonable assume that the failure to make quality BD was due to
the poor quality of the WVO I used?
2. What pre-treatment would be appropriate?
Tom
----- Original Message -----
From: "Jan Warnqvist" <[EMAIL PROTECTED]>
To: <biofuel@sustainablelists.org>
Sent: Monday, August 21, 2006 10:39 AM
Subject: Re: [Biofuel] tirating a virgin oil
> Hello Emre, Rafal et al.
> I have to say that I partially disagree with some of your statements. The
> limit of FFA for a flawless trans-esterification is drawn at 5mg KOH/g of
> oil. Any value above will demand pre-treatment of the oil. It is always
> important to check the water content, which should be below 0,5%. Try to
> get
> hold of a water-in-oil test kit for quick determination.
> If we are talking about the EN standard, it is always necessary to process
> the oil/catalyst/methanol mix for 90 minutes to obtain the right values
> for
> tri- di- and monoglycerides. And - this assumes that you have correct
> stochiometric conditions and no methanol losses during processing.
> As for the phophatides and the chlorophyll compounds, my experience is
> that
> these are not very important for the processing result, unless the values
> of
> these are extremely high (thousands of ppms). If so, the oil is usually
> very
> dark. Totally refined oil, on the other hand, may have preservatives
> added,
> and some of these will eat catalyst. So, good oil quality is a tricky
> thing.
> Best of luck to you !
> Jan Warnqvist
> AGERATEC AB
>
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