Article Highlights• Experimental investigation of oxidative desulfurization of tire pyrolysis oils • Comparison of various additives is carried out for purification of pyrolysis oils • Boiling range of fractions is determined for blending with other fuels Abstract This paper presents a low cost method for the purification of oils obtained from the pyrolysis of used tires. Oxidative desulfurization is a promising route for purification of tire pyrolysis oils as hydro-desulfurization may not be affordable for small scale industries. Different additives and acids have been employed for the enhancement of properties of pyrolytic oils. The experimental conditions were kept identical throughout, i.e., atmospheric pressure and 50 °C temperature for comparison of performance of various additives. The use of hydrogen peroxide-acetic acid mixture (10 wt.%) was found more economical and effective in desulfurization and improvement of fuel properties of sample oils. The contribution of sulfuric acid in desulfurization and decreasing viscosity was also satisfactory but due to the high price of concentrated sulfuric acid its use may not be economical. Calcium oxide and Fuller's earth was not found to be effective in desulfurization. The results indicate that oxidative desulfurization could render tire pyrolysis oils suitable for blending as heating fuel.

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Closed-loop supply chain networks are gaining research popularity due to environmental, economic and social concerns. Such networks are primarily designed to overcome carbon footprints and to retrieve end of life products from customers. This study considers a multi echelon closed-loop supply chain in the presence of machine disruption. A multi-objective model is presented to optimize the total cost, the total time and emissions in a closed-loop supply chain network. The aim is to analyze the trade-off between the objectives of cost, time, and emissions and how these decisions are impacted by the selection of different available machines. A number of solution approaches are tested on a case study from the tire industry. The results suggest the improved performance of the hybrid heuristic and the importance of controlling disruption in a closed-loop supply chain network. Furthermore, there is a trade-off between the different objective functions which can help the decision maker to choose a particular solution according to the preference of an organization. Finally, conclusion and future research avenues are provided.

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