21st December 2006, 07:36 PM
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 | Junior Member | | Join Date: Dec 2006 Location: ANDURAMBA 4355 QUEENSLAND
Posts: 36
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| Re: Warnqvest Conversion Test (3/27 27/3)
Hello Tilly, I subscribed to this er, thread I guess you call it but when I replied to your email I guess I sent it to the wrong place. Someone sent a rather terse reply. Sorry. In reply to your questions I have replied as accurately as possible. Where did you learn how to titrate! Well...ah yes...Slight error there. For the titration process I disolved exactly one gram of NAOH in exactly one ltr of distilled water then measured out exactly ten mils of Isopropropyl alcohol into a beaker. Then I added exactly one mil of oil to the Isopropyl alcohol and stirred it till it disolved. Then I added two drops of phenol red and sloshed that around till it went vaguely yellow. Then I started adding the 1:1000 NAOH with a graduated eye dropper, one drop at a time until the colour turned pink and stayed pink. I did write the result down somewhere but I have since lost it. I am resaonably certain that the colour change occurred after I added about 1,2 mils of NAOH. I worked out that I would have to measure out 6.2 grams of NAOH per litre of oil. That would have come to 1.2 kilo's.(Which I then disolved into 40 ltrs of methanol.)
> For the easiest method of titrating you can not beat the The World Famous Chopstick Titration Technique (Pat Pend) - Topic Powered by eve community (http://biodiesel.infopop.cc/groupee/forums/a/tpc/f/719605551/m/9541092001)
>
> Did the something that settled out in the warnqvest test look like little beads of oil? That is a fail. Yes. It looked like oil. (I also tested the first batch and noticed that whilst I did not get an oil residue I did produce a white fluffy looking substance but the first batch was made using the acid / base method.)
> Do you wish to make biodiesel that passes the Warnqvesat test? Yes, I think so. I would like to make it as pure as possible. I thought that seeing as I had spent several hundred dollars on tanks, pumps and things, I may as well do it properly.
> If you do you will need to re-process the biodiesel.
> What type of car will you use it in and is it a direct or indirect injection diesel? I believe that the engine in my truck is an indirectly injected diesel. (Holden Rodeo Turbo.)
> A titration detects Acids NOT triglycerides. So a titration tells you nothing important about your biodiesel. OK.
>
> Tell us all about how you made your biodiesel in metric measure including: .I pumped 200 litres of liquified chip fat into a bottom drained reactor vessel with cone on the bottom and heated it to 55 degrees Celcius.
> Total WVO reacted. 200 litres.
> Total methanol used 40 litres.
> Titration of the oil 1.2 mils. (As I remember it.)
> Total NaOH/KOH used 1.2 Kilo's.
> Type of reactor. 200 ltr drum with a bottom drained cone with a recirculating pump.
> Temperature of reaction 55 degrees C plus or minus a few degrees either side
> Total time for reaction I maintained the temperature more or less constant at 55 degrees for an hour then let the batch cool down by itself. I kept the pump on for the first hour to keep the oil and sodium methoxide agitating.
> and anything else that you may think is important. I checked the purity of the NAOH as best I could to ensure that it had not degraded into what ever it degrades into. The granules were a sort of whitish translucent colour.
That's about it Tilly. The colour of the batch looks about right if the photo's on the internet are anything to go by. It is a pale golden colour. As soon as I perform the warnqvesat test, [(Please excuse my spelling of it) Thats the one with 27 mils of methanol and 3mils of oil right?] the methanol goes milky and oil starts to settle out.. Hope you can help
Regards charris
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