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How to test methanol for purity

This topic can be found at:
http://biodiesel.infopop.cc/eve/forums/a/tpc/f/4441089311/m/1697076643

November 19, 2011, 11:47 AM
Graydon Blair
How to test methanol for purity
When recovering methanol, it's important to determine what it's purity is.
This is important to know so that it can be properly blended with new methanol in the right amount when using the recovered methanol to make Biodiesel with.

It's pretty easy to do and requires a hydrometer, a testing cylinder, a thermometer, a calculator, and some scratch paper.

- Add the hydrometer to the methanol in the testing cylinder
- Take a specific gravity reading and a temperature reading
- Compare it to the standard for methanol and subtract the difference
- Then calculate the purity of the methanol

I did a video on how this can be done and have posted it here:
http://www.youtube.com/watch?v=1RNyiktgUjI

Enjoy!
-Graydon




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November 19, 2011, 12:05 PM
BWilder
At higher purities you can also use a manometer, much like testing bio for water, for a bit more accurate results
November 19, 2011, 03:49 PM
Graydon Blair
Great suggestion!

Here's the link to where they're currently discussing Manometer's
http://biodiesel.infopop.cc/ev...11061471/m/530102221




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Utah Biodiesel Supply Blog - Tutorials, Articles, Pictures, & New Products!
Free Biodiesel Tutorial Videos - Learn to make Biodiesel through videos!
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May 24, 2014, 02:44 PM
imakebiodiesel
Ive recently been distilling the methanol from my glycerol byproduct using a simple PID controlled reflux still and I aim at getting 95 - 97% purity. I then use molecular sieve to remove the rest of the water.
To test for final purity I use my carbide manometer in the following way.

A carbide manometer calibrated for biodiesel is far too sensitive for methanol.

Find an anhydrous liquid, in my local hardware store they sell White spirit ( sometimes called Mineral Spirits) for cleaning paint brushes. When tested in my manometer it gives a zero reading.

Put your jar on the scales and weigh in 95gms of your anhydrous liquid. Carefully add 5 grams of your recovered methanol. Carry out the test.
Multiply the reading by 20 and you have your purity reading. ( 1% water = 10,000ppm.)

A manometer that can read up to 2000ppm in biodiesel will be able to read up to 4% water content in methanol.
May 26, 2014, 06:28 AM
Graag1
If anyone more local to us can talk to us about meth recovery, were in a position to start doing it. We need a kit, it should preferably run on electricity rather than steam

Any advice would be welcomed before I go out and get the wrong thing!


Many Thanks

Mitch

http://premiumbiodiesel.co.uk
May 26, 2014, 07:43 AM
WesleyB
You might contact Murphy at Murphy's Machines, telephone number in the United States (586)995-0101. Read up on distilling anhydrous methanol. There's a book "A Text-Book of Practical Organic Chemistry" by Arthur I. Vogel, that tells how to do it. If you're going to distill anhydrous methanol in a big way, I'd do the book research work first. Thanks
May 26, 2014, 02:26 PM
imakebiodiesel
Hi Mitch, what sort of capacity are you thinking of? A friend of mine is just at the moment commissioning a 500litre unit (total capacity 1000litres)in Northern Ireland. My own unit is very small, 100 litre, but the principle is the same as for a larger still.