Abstract
This paper addresses recycling of waste engine oils treated using acetic acid. A recycling process was developed which eventually led to comparable results with some of the conventional methods. This gives the recycled oil the potential to be reused in cars’ engines after adding the required additives. The advantage of using the acetic acid is that it does not react or only reacts slightly with base oils. The recycling process takes place at room temperature. It has been shown that base oils and oils’ additives are slightly affected by the acetic acid. Upon adding 0.8 vol% of acetic acid to the used oil, two layers were separated, a transparent dark red colored oil and a black dark sludge at the bottom of the container. The base oils resulting from other recycling methods were compared to the results of this paper. The comparison showed that the recycled oil produced by acetic acid treatment is comparable to those recycled by the other conventional methods.
Highlights
Waste engine oil is a high pollutant material that requires responsible management
A substantially low flash point of an engine oil is a reliable indicator that the oil has become contaminated with volatile products such as gasoline
The flash point of the base oil produced using acetic acid treatment combined with vacuum distillation (220 °C, row 4) is giving comparable results to that produced by professional companies using sulfuric acid (222 °C, row 2) and the marketed base oil (232 °C, row 1)
Summary
Waste engine oil is a high pollutant material that requires responsible management. Waste engine oil may cause damage to the environment when dumped into the ground or into water streams including sewers. The conventional methods of recycling of waste engine oil either requires a high cost technology such as vacuum distillation or the use of toxic materials such as sulfuric acid. These methods produce contaminating by-products which have highly sulfur levels, especially in the Kurdistan region/Iraq. Extraction occurs at pressures higher than 10 atm and requires high pressure sealing systems which makes solvent extraction plants expensive to construct, operate and the method produces remarkable amounts of hazardous by-products [14] Membrane technology is another method for regeneration of used lubricating oils. The recycled oil obtained by this method has been shown to have potential for reuse as an engine lubricant
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