Recycling of Waste Engine Oils Using a New Washing Agent

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.

Designation of Chosen Heavy Metals in Used Engine Oils Using the XRF Method

“…Therefore, accessible literature concerns mostly such elements as Zn, Fe, Cu, and Pb. Table 2 shows the concentration values of heavy metals under analysis presented in literature [20][21][22][23] in reference to concentration ranges obtained in our own research. Yang et al [20] researched the presence of select heavy metals in used oils from vehicle service stations maintaining passenger cars working on petrol only by using the XRF method.…”

“…Yang et al [20] researched the presence of select heavy metals in used oils from vehicle service stations maintaining passenger cars working on petrol only by using the XRF method. Hamawand et al [21] researched the content of select heavy metals in used engine oil from passenger cars using the AAS method. Cassap [22] analysed new and used engine oils from passenger cars using the IPC-OS method.…”

Compound changes in re-refined used lubricating oils using fabricated Packed-bed reactor

“…Its shortcomings are that the expensive membranes used in the method may get spoiled or fouled by large particulate matters. 9,15 The application of the packed-bed reactor using the locally available diatomaceous material is a safe and economical small-scale purification of used lubricating oil since the contaminants have good affinity for diatomaceous materials. This approach is similar to the principle of chromatography separation, hence this study.…”

“…6,7 Acid-clay technique which had also been severally adopted has disadvantages viz., production of large amount of pollutants, incapability to treat modern multi-grade oils and the difficulty in removing asphaltic impurities. 1,8,9 Solvent extraction method has substituted acid treatment for improving the oxidative constancy and viscosity/temperature characteristics of base oils. The solvent selectively dissolves the unwanted aromatic components, leaving the required saturated components, particularly alkanes, as a distinct phase.…”

“…The process also generates significant amounts of hazardous by-products. 9,14 Another useful method is the membrane technology, here three types of polymeric hollow fibre membranes, polyethersulphone (PES), polyvinylidene fluoride (PVDF), and polyacrylonitrile (PAN), were used for recycling the used engine oils. The process is carried out at 40 °C and 0.1 MPa pressure.…”