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Waste motor oil reformer.

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High temperature used automotive oil reformer. 
WMO to diesel fuel.

                  Small high temperature waste motor oil reformer.

 Here is my personal impression of the widely used in oil
industry secondary crude oil distillation system, or high temperature reformer (cocking machine). This kind of equipment is usually used for processing of the crude oil remains that are left after the main straight run of the rich crude oil, when all naturally presenting fractions are already were removed and the only heavy oil without any extra fractions was left behind.
Thus to create some new fractions within the secondary crude the substance is exposed to the extreme heating conditions that causes the molecules of the oil to move around and literally burst and crack into the smaller chains creating all over again new hydrocarbon fractions from coke to diesel and petrol distillates.
Now I can agree that not everyone of us have an access to the real crude oil, but everyone can get the used automotive or hydraulic oils - in fact by comparison with the secondary crude the used automotive is much better choice because it was already treated once, it was made free of sulfur and other harmful components thus you are technically dealing with the crude that was prepared for the automotive use.
What does it mean? - it means that the fuels obtained by processing the WMO is technically neutral and can be treated and cleaned without using any potentially dangerous methods that involve some chemicals that can be dangerous for the back yard researcher and for environment. 
At the beginning I was thinking about the waste vegetable oil processing into a bio fuel, but simple comparison of operations and chemicals involved in two separate processes of diesel production using reformer and veggie oil processor gave me the next idea, thus for the bio diesel production one will need to clean the oil first, then settle it in reactor with strong alkali and methanol (both are dangerous and toxic), then after conversion you'll need to separate the glycerol and the fuel, then you'll need to wash the fuel using some water  and dry it after all, and despite of all of this your fuel will be really short living substance that is not designed for any long storage, plus it can turn solid at temperatures close to the 0c. not really convenient - too many operations, harmful chemicals (plus not free as well) possible water pollution, short life of the fuel that not reliable at colder temperatures.WMO reformer
Now let see what the waste automotive oil would involve and what kind of results can be obtained: the oil should be free of water, also better to have it filtered - just like a veggie oil, then you run it once through reformer and settle in an air tight container for three days to allow the bitumen to separate and deposit on the bottom of the container.
Then the resulting fuel can be transferred to the storage/settling container where it is settling with addition of some silica gel, that is absolutely neutral substance (even used as moisture absorber in the food packs) for at least three days, and after that it can be either used in the diesel engine or stored as long as you want (if stored with silica - getting even better over the time).
Also this kind of fuel will not freeze at +5c simply because the source oil was made the way to stay liquid despite the negative temperature. moreover - there is no need to wash it with water, the used silica can be placed to the log burner on the metal tray where can be reactivated and used again.
WMO ReformerAs you can see the processing of the waste automotive (mineral and synthetic) oils is friendlier than production of the bio fuel that requires the harmful and expensive chemicals, water washing and drying.
Anyway, here is the small piece of equipment that is capable to produce enough for a personal use, to run your diesel gen set  agricultural machinery or diesel car (not suitable for common rail systems).

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Running the reformer.
Experimental oil still.
The reformer itself a complicated contraption, and while it is capable of processing an automotive waste oil, It still requires some partial dismantling before any next distillation run. Thus for the convenience of the oil processing, I was experimenting with different arrangements of the WMO distillation equipment. I tried to simplify the construction of the distiller, also to make it genuinely continuous and added an electronic control unit that helps to keep the constant predetermined temperature of the distillation depending on the type of the processing oil.

The test run of an experimental oil distiller.

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