How to purify used engine oil?

The so-called used engine oil means that the engine oil is mixed with impurities such as moisture, dust, other miscellaneous oils, and metal powders produced by the wear of mechanical parts during use, which causes the color to turn black and the viscosity to increase. Or the engine oil gradually deteriorates, generating organic acids, gums and asphalt-like substances. If dumping used engine oil at will, it will pollute the environment. We generally use waste oil distillation machine to purify it into diesel for secondary use.

Waste oil distillation machine for purification uses

The following is its specific purification process of used engine oil to diesel fuel designed by Henan Doing Company:

The purification process of used oil to diesel oil

1. Pretreatment of heat transfer oil and condensed water

The waste oil distillation machine needs to be pre-prepared for heat-conducting oil circulation. Then start the oil injection pump, and send the oil to the expansion tank. The heat transfer oil gradually fills the entire system by its own weight through the expansion tube. Turn on the cooling circulating water pump to make the condensed water circulate normally in the horizontal condenser.

2. High temperature distillation

The oil pump is used to transport used engine oil to the distillation reactor, and the heat transfer oil and the burner are used to heat the reactor at the same time. In a high temperature and oxygen-free environment, the distillation reactor will produce oil and gas after reaching a certain temperature.

Used engine oil distillation plant reactor

3. Condensed into oil

The heat-conducting oil heats the distillation reactor of waste engine oil distillation machine to 250 degrees Celsius, allowing the water and emulsified oil to fully evaporate. After buffering in the buffer tank, it enters the horizontal condenser, where it condenses into oil and is finally stored in the first fraction tank.

The heat-conducting oil and the burner are heated simultaneously to the distillation reactor to 380-400 degrees Celsius, there will be oil and gas volatilization, after buffering in the buffer tank, it enters the horizontal condenser and condenses into oil, which is stored in the second distillation tank.

The temperature of the reactor continues to be maintained at 380-400 degrees Celsius. The volatilized oil gas passes through the buffer tank and is catalyzed by the catalytic tower.Then it enters the horizontal condenser, and is condensed into oil to be stored in the third fraction tank.

Horizontal condenser of waste oil distillation machine

4. Exhaust gas purification

The waste oil distillation machine is equipped with tail gas purification device, the non-condensable oil and gas in the condensing system is purified by a water seal and used as fuel to heat the distillation reactor.

5. Decolorization and deodorization

Feed the oil in the oil tank into the decolorizing pot, and the white clay is added to stir to decolorize. Then the oil fully mixed with the white clay is pumped into the leaf filter to obtain a clear color oil, which is followed by finely filtered to remove impurities. You can get clean, bright non-standard diesel. This is the fine point of waste oil distillation machine, which needs to go through multiple filtration.

Leaf filter of waste oil distillation machine

6. Flue gas treatment

The flue gas generated by the heat-conducting oil furnace and the reactor is processed by the desulfurization tower and discharged into the atmosphere after reaching the national emission standard.

Purifying used engine oil into diesel fuel is a detailed and complex process, so it needs higher requirements placed on designing of waste oil distillation machine. Doing's waste oil distillation machine provides a deep purification system, and the refined diesel oil has a brighter color and higher purity. Here are the applications of purified diesel fuel extracted from used engine oil.

Applications of purified diesel fuel from used engine oil

If you want to know more details, please feel free to contact us and share us your requirements. We Henan Doing Company can customize you suitable waste oil purification distillation machine purchasing and installation solutions. From mini small scale 100kg to big scale 14+TPD waste oil distillation machines, all are customizable! And our waste oil distillation machines can also be used to recycle and purify waste motor oil, old lube oil, tire plastic pyrolysis oil, etc.