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 No.23062

Spring is approaching. Plan on growing anything, /hobby/?
Me and a friend are looking to plant rapeseed and hemp to try and make biodiesel. Should be interesting.

 No.23173

>>23062
Yeh. I am growing wheatgrass for my kitty and mushrooms once I get some more money. How do you make biodiesal? Sounds awesome. Can you make enough to run a vehicle with just those crops?

 No.23189

>>23173
mushrooms? like how champignon and shiitake are grown at scale? in like sawdust logs?
>How do you make biodiesal? Sounds awesome. Can you make enough to run a vehicle with just those crops?
sure, the real question is yield per ha. process is roughly this:
1. grow and harvest your oil crop of choice
2. press oil using a rapeseed press. they use water to do the actual pressing, very neat
3. dissolve an amount of NaOH (lye) in an alcohol. methanol is cheapest, ethanol is safer
4. mix the oil and NaOH+alcohol mixture in a cylinderconic tank with a tap on the bottom
5. keep the tank at around 50-60°C and stir
6. you will eventually see a thick transparent liquid collect at the bottom. this is glycerol. separate that out
7. once fully reacted, spray water from the top to get rid of any remaining alcohol and lye
8. separate out the final biodiesel
exact recipes are available online. this is a transesterification process where the glycerol backbone in the fat is replaced by the alcohol. NaOH is a catalyst. different alcohols and different oils produce fuels with different properties. they're all fatty acid esters however
you may need to mix this with regular diesel to improve its gelling point, or use different kinds of these biodiesels together. there's a bit of experimentation there


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