Title: Comparative assessment efficacy of yield maximisation of recovered used lubricating oil by Ca (OH)₂-Iso-butanol/KOH-1-butanol extractive-flocculate process by central composite design approach

Authors: Sayantan Sarkar; Deepshikha Datta; K.S. Deepak; Bikash Kumar Mondal; Bimal Das

Addresses: Department of Chemical Engineering, National Institute of Technology Durgapur, Mahatma Gandhi Rd., A-Zone, Durgapur, West Bengal 713209, India ' Department of Chemistry, Brainware University, Barasat, Kolkata, West Bengal, India ' Department of Chemical Engineering, National Institute of Technology Durgapur, Mahatma Gandhi Rd., A-Zone, Durgapur, West Bengal 713209, India ' Department of Chemical Engineering, National Institute of Technology Durgapur, Mahatma Gandhi Rd., A-Zone, Durgapur, West Bengal 713209, India ' Department of Chemical Engineering, National Institute of Technology Durgapur, Mahatma Gandhi Rd., A-Zone, Durgapur, West Bengal 713209, India

Abstract: The waste lubricating oil produced after prolonged use creates a threat to the environment, health, and economy. Proper disposal method and treatment of this waste oil is required for the development of a sustainable environment. The present work emphasises on extraction flocculation process for reclamation of used engine oil. Comparative assessment and optimisation study was done using two different solvents (Iso-butanol,1-butanol) and flocculants (Ca (OH)₂ and KOH) by central composite design approach to achieve the maximum percentage recovery of refined oil. The optimised parameters evaluated were extraction time: 30 minutes and 80 minutes, extraction temperature: 60°C and 50°C, solvent to waste oil ratio(g/g): 5.66:1 and 7:1, flocculant dosages:1g/kg of solvent and 3g/kg of solvent for Iso-butanol-Ca (OH)₂ (CHB-iso) and 1-butanol-KOH (KHB-1) solvent-flocculants systems respectively. The yield of recovered oil with 1-butanol-KOH was found to be higher (85.95%) than Iso-butanol-Ca (OH)₂ (65.62%) due to its lower tendency for eradication of carbonaceous matter from regenerated oil.

Keywords: waste lubricating oil; response surface methodology; central composite design; CCD; extraction-flocculation; yield.

DOI: 10.1504/IJEWM.2024.140969

International Journal of Environment and Waste Management, 2024 Vol.34 No.4, pp.472 - 503

Received: 18 Mar 2021
Accepted: 02 Mar 2022
Published online: 05 Sep 2024 *

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