Oil recovery from petroleum sludge through ultrasonic assisted solvent extraction.

J Environ Sci Health A Tox Hazard Subst Environ Eng

b WZU-UNBC Joint Research Institute of Ecology and Environment, Wenzhou University (WZU), Wenzhou , Zhejiang Province , P. R. China.

Published: September 2016

AI Article Synopsis

  • The study investigates the impact of ultrasonic assisted extraction (UAE) on oil recovery from refinery oily sludge, comparing two UAE methods: probe (UAEP) and bath (UAEB) systems against mechanical shaking extraction (MSE).
  • Three solvents—cyclohexane, ethyl acetate, and methyl ethyl ketone—were tested, with factors like solvent type and extraction duration found to significantly influence oil recovery rates.
  • The optimal UAE probe method achieved 68.8% oil recovery in just 20 seconds, outperforming the 62% recovery from MSE after 60 minutes, highlighting UAE as a superior method for recycling oily sludge.

Article Abstract

The effect of ultrasonic assisted extraction (UAE) process on oil recovery from refinery oily sludge was examined in this study. Two types of UAE treatment including UAE probe (UAEP) system and UAE bath (UAEB) system were investigated. Their oil recovery efficiencies were compared to that of mechanical shaking extraction (MSE). Three solvents including cyclohexane (CHX), ethyl acetate (EA), and methyl ethyl ketone (MEK) were examined as the extraction solvents. The influence of experimental factors on oil and solvent recovery was investigated using an orthogonal experimental design. Results indicated that solvent type, solvent-to-sludge (S/S) ratio, and treatment duration could have significant effects on oil recovery in UAE treatment. Under the optimum conditions, UAEP treatment can obtain an oil recovery of 68.8% within 20 s, which was higher than that (i.e., 62.0%) by MSE treatment after 60 min' extraction. UAEB treatment can also obtain a promising oil recovery within shorter extraction duration (i.e., 15 min) than MSE. UAE was thus illustrated as an effective and improved approach for oily sludge recycling.

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http://dx.doi.org/10.1080/10934529.2016.1191308DOI Listing

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