Abstract
Lubricating base oil is commonly extracted from lube-oil cut, a petroleum cut, with the use of an aromatic solvent. Aromatic content of the final product is an important criterion specifying the product quality. The aromatic removal process to produce the lubricating oil should be carried out in a Liquid-Liquid extraction column. In a typical solvent extraction process, solvent to feed ratio, solvent and feed temperatures, agitation rate, and settling time could directly affect the yield of extraction. In the current study, the effect of agitation rate and settling time on the yield of extraction was studied. It was found that a settling time of 2hrs and an agitation rate of 430 RPM to be the optimum parameters of the extraction process.
Highlights
Lubricating oils are one of the main products of an oil refinery
Mass transfer in a liquid-liquid extraction process is usually a slow phenomenon, meaning more time is needed for two phases to reach the equilibrium condition
Since the change in the amount of extraction of aromatic after 2hrs of settling time was not significant, thereby the 2hrs being selected as the optimum settling time
Summary
Lubricating oils are one of the main products of an oil refinery. Nowadays, to decrease the adverse effects of friction forces, demand for lubricating oil is increasing significantly [1]. Manufacturing of lubricating base oils requires the aromatic compounds to be extracted to some extent from the lube oil cut resulting in having a better quality product [2,3,4]. Lube oil cuts normally contain aromatic and saturated (naphthenic and paraffinic) compounds. To determine the composition of complex hydrocarbon mixtures, standard test methods such as ASTM D2007 [18] might be used. ASTM D3238 [20] standard test method can be used to characterize the petroleum cuts According to this test, density at 293K (d293), RI at 293K (RI293), molecular weight and Sulfur content (%S) of the samples can be used to define the distribution of aromatics (A), naphthenic (N) and paraffinic (P) compounds in a given sample. Increasing the solvent to feed ratio may result in having a higher yield of extraction, using too
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