There's an interesting report on biodiesel production from tallow at this link:
https://www.mla.com.au/contentassets...nal_report.pdf
Quote:
Abstract
MLA and its partners have successfully developed a process and formula for a B5, B20 and B100 Biodiesel additive. The additive overcomes crystallisation and cloud-point issues associated with tallow-based biodiesel. The additive lowers the cloud point of animal fatbased biodiesel from 50 degrees to 21 degrees Fahrenheit (10 degrees to minus 6 degrees Celsius),
This technology increases the potential for using biodiesel made from animal fats in the winter and in colder climates. This is critical for the extended applicability of tallow-based biodiesels and will potentially drive the demand for tallow as a biodiesel feed-stock.
This report details the markets, feed-stocks and manufacture of biodiesel; the economics of biodiesel production from tallow; the technology and value proposition of the additive.
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I think the whole renewable fuels thing is worth revisiting in the current climate, especially for diesel vehicles because it effects the price of everything you buy through transport costs.
I went to school with a kid who was a few years younger than me who was trying to turn sawdust from a local sawmill into biodiesel, I wonder if he found any success.