Optimization of spent bleaching earth regeneration using supercritical carbon dioxide using response surface methodology

Document Type : Research paper

Authors

1 Chemical Engineering Group Faculty of Engineering University of Mohaghegh Ardabili

2 Assistant Professor, Chemical Engineering Group Faculty of Engineering, University of Mohaghegh Ardabili

3 Shiraz university

Abstract

Bleaching using bleaching earth is one of the essential processes in edible oil refineries. The spent bleaching earth containing 20-40 % oil, therefore it is ready for rapid oxidation and flammability. To prevent the environmental problems, it is necessary to have a proper treatment on spent bleaching earth before disposal in the earth. The main objective of this study is to examine the removal percent of oil from spent bleaching earth using supercritical extraction process. Experiments were designed based on the central composite design of four parameters and the results were analyzed and optimized using response surface methodology. According to the results of the proposed mathematical model, the best operating conditions were determined at pressure of 200 bar, temperature 44 °C, solvent flow rate 0.04 mL/s and time 90 minutes. The amount of extraction was 3.26 % under the obtained optimum conditions which had been an appropriate compliance with the predicted value by related model (3.49 %).

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Main Subjects

References

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Journal of Separation Science and Engineering
Volume 10, Issue 2
February 2019
Pages 20-29

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