Anhydrous sodium methylate

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This page gives a guide to making Biodiesel from Anhydrous Sodium Methylate (ASM), a liquid catalyst which can be used in place of the more conventional Sodium Hydroxide or Potassium Hydroxide catalysts.

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What is it and where do I get it from?

What is Anhydrous Sodium Methylate

It is a white powder in pure form but for practical use in diy biodiesel it is dissolved in pure methanol at 28% to 30% concentration. 28% ASM in Methanol is a colourless, viscous fluid with a slighlty sweet alcohol smell - very similar to mehanol which, after all, makes up a large proportion of the fluid volume. ASM is both highly flammable and corrosive. It evaporates readily to leave a white powdery residue and at low temperatures it tends to precipitate out the white solid.

Availability

Compared to Sodium Hydroxide and Potassium Hydroxide which are readily available from a number of chemical suppliers around the UK, ASM is somewhat harder to source. At the time of writing, the only company readily supplying ASM to DIY producers is Trinity Research who supply it in 25L HDPE containers, 60L drums, 200L drums and IBCs.

Making biodiesel with Anhydrous Sodium Methylate

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Calculating how much to use

A lot of clever people have gone through a lot of complex calculations to work out the correct amount of ASM to use. However, a certain James Leach from the Vegetable Oil Diesel forum has simplified pages of complex organic chemistry down to a simple, single line equation

ml of Methylate = ((Base Amount in grams + titration value in grams) X batch volume in litres) X 5

As an example : assuming a batch size of 150 litres, a titration of 2.0g/l and using a base value of 5.0 g/l gives

((5.0 + 2.0) X 150) X 5 = 5250ml of Methylate

Clearly the base figure is adjustable and can be tweaked to get as low as possible whilst maintaining good results.

Whilst it is perfectly possible to use a single stage reaction for making biodiesel, many brewers are now taking advantage of the benefits of the two stage no titration process with it's reduced chemical usage, reduced soap production and better yields.

Mixing

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