extraction of naphthalene using methanol in batch and dynamic mode, optimization applying response surface methodology

A laboratory study on liquid-liquid extraction (lle) system was carried out in batch and dynamic modes to extract naphthalene from fuel-oil, using methanol as extractant. this study investigates the optimization of naphthalene extraction using methanol in both batch and dynamic lle modes.in batch mode, a central composite design (ccd) was applied to optimize extraction parameters: extraction ratio (r), contact time (t), temperature (t), and stirring speed (ss). in dynamic mode, a box-behnken design (bbd) was used to evaluate the influence of feed input, extraction ratio, and successive extractions.batch extraction yielded an optimum naphthalene removal of 80.62% at r = 1.5, t = 5 min, t = 5°c, and ss = 100 rpm. successive extractions led to complete removal. dynamic extraction achieved total elimination at 30 ml/h, r = 1.5, and three successive extractions.this study demonstrates the feasibility of using methanol for efficient naphthalene extraction. future research should focus on solvent regeneration and industrial-scale applications.