Jump to content
Sign in to follow this  
Elite Engineer

Methanol vs Ethanol in Biodiesel synthesis:

Recommended Posts

When making biodiesel, which alcohol yields a more energy efficient product: methanol or ethanol?

 

-making some at home, and I have a lot of ethanol I can use, however I want the best product I can make.

 

~Thanks,

 

~ee

Share this post


Link to post
Share on other sites

Though, industrial-scale biodiesel uses methanol. Does it react more easily maybe? Or is it cheaper where vegetable oil is available? The effect on viscosity and pour point must be small.

Share this post


Link to post
Share on other sites

In the UK its methanol, Ethanol attracts a high tax so using it can be a cost issue. To get around the tax you use methanol to denature the ethanol and add bitrex! Bonkers if you ask me seeing as I live in Scotland.
If they dropped the stupidity of tax being the same for bio fuel and dropped the tax on ethanol used for fuel production, then the whiskey industry could distill all year every year and make a sustainable fuel.

Share this post


Link to post
Share on other sites

The duty paid on ethanol for drinking can be reclaimed from the tax man if you can show that it in't used for humn consumption.

On the other hand, all fuel for road vehicles has to pay fuel duty.

 

The big factor isn't duty, but simple cost. methanol is much cheaper than ethanol.

Share this post


Link to post
Share on other sites

First you have to have a distilling license in the UK, this is only considered if you distill over 1800 liters a year (I am not 100% sure on that number, but its high). So claiming back tax isnt an option on a small scale set up as it is technically illegal but somewhat complicated!

Ethanol currently costs us £1.20 Ltr without duty. Methanol in an IBC works out much cheaper

Edited by GM11

Share this post


Link to post
Share on other sites

No, you don't need a distillation license to claim back duty; the lab I work in used to do it.

Even if you claim back the tax, ethanol still costs more than methanol; it's a more complicated molecule.

 

None of this matters; ethanol gives a slightly higher energy density, and that's what the OP asks for.

Edited by John Cuthber

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.