Heavy Fuel Oil Recovery from Oil Sludge by Multiple Extraction Processes

Abstract

Oil sludge from the bottom tank of shipping process was used to extract heavy fuel oil using multiple extraction techniques. Solvent extraction is necessary to recover valuable hydrocarbon from oil sludge and to reduce the volume of waste sludge so a further reduction in oil sludge has an impact effect on land and water. This process used methyl ethyl ketone (MEK) at different operating temperatures from room temperature to 50 ᵒC and different solvent to sludge ratios. The percent recovery of heavy fuel oil was varied with these operating variables. The initial recovery was 43.46% at 50 ͦ C for the first extraction stage and increased to a total of 54.2 % for the second extraction stage. The third extraction stage of the remaining solid was able to recover an additional quantity of oil to bring the total heavy fuel oil recovery to 62.2 mass% of the dry oil sludge. The physical properties of the recovered heavy fuel oil from each extraction stage were studied. The recovered heavy fuel oil from the third extraction stage showed higher specific gravity, carbon residue, ash content, and as phaltene content comparing with the first and second extraction stages.

Trend in Research on Characterization, Environmental Impacts and Treatment of Oily Sludge: A Systematic Review

“…They found that the optimal temperature, solvent concentration, rotation speed, treatment time, and pH was 30 • C, 2.0 g•L −1 , 200 rpm, 60 min; and 11, respectively. Al Zubaidi [120] proposed a multistage extraction procedure to maximize oil recovery. The separate experimental results by Tian [121] and Hou et al [119] all suggested that ionic liquids could effectively decrease the heavy oil interaction force.…”