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vegetableoildiesel.co.uk » SVO and WVO » Blending veg oil with solvents » Why does adding petrol/gas make the fats drop out?

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fred1

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posted on 25-11-2009 at 06:08 PM

Why does adding petrol/gas make the fats drop out?

Hi

As the title says Why?
Is it a simple case that it lowers the viscosity, and therefore the fats drop to the bottom more quickly, or is there something else going on?

Anyone any ideas?

Thanks

e3msb

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posted on 25-11-2009 at 06:20 PM

I would reckon that it is acting as solvent on the fats , and so breaking them down, and thats why it works better when you mix it at a warmer temperature. Whatever, it certainly works, as my samples have shown this last couple of weeks on my poor clouding bio made from about 30% solid fat.

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jhanananda

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posted on 26-11-2009 at 03:02 AM

Hello fred1, I am not sure why impurities drop out of solution in WVO when gasoline is added to it. It is at least due to reducing the viscosity causes suspended particles to precipitate out, but the contaminants drop out within about an hour, so I am speculating it is more than just a reduction of the viscosity. There is possibly another relationship in which petroleum distillates are preferentially absorbed into solution, while marginal solutes, such as water, are chemically forced out of solution.

CHUNDER

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posted on 26-11-2009 at 12:19 PM

Acitone stops fats droping out and they pass through filter and burn in cylinder . So boil oil at about 120c for 2 hours to drive off water alow to cool to ambient filter to 1 mic add petrol up to 10% cetain improver and acitone mix all . Then put in fule tank. job done.

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jhanananda

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posted on 26-11-2009 at 08:15 PM

OK, CHUNDER, sounds like a workable formula. So, what do you recommend is the relationship between animal fat and acetone? Or, how much acetone are you adding to your mix?

dodgypenguin

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posted on 27-11-2009 at 08:58 PM

This might be a stupid question, but is it a good or a bad thing that petrol makes the fats drop out?

Does premixing with petrol after usual dewatering/filtering and letting the fats drop out and adding the non-fatty liquid into car mean longer filter life etc.......or is there a substantial drop off in performance because the loss of fats mean less energy (?) in the oil?

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jhanananda

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posted on 28-11-2009 at 02:53 AM

Hello dodgypenguin, the term 'fats' is a bit ambiguous, because vegetable oil is fat. However, when the term 'fats' is used here, it usually means animal fat. In the winter animal fat is undesirable, because it tends to solidify at hi temps, say 75F (25c). So, to answer your question, yes, it is a good thing to precipitate out the animal fat. But, no, doing so does not reduce the energy of the fuel. Also, adding petroleum distillates seems to cause impurities, such as water, animal fat and particulate to precipitate out rapidly, thus preserving the fuel filters.

vegetableoildiesel.co.uk » SVO and WVO » Blending veg oil with solvents » Why does adding petrol/gas make the fats drop out?


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