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  • Title: Ultrasound assisted oxidative deep-desulfurization of dimethyl disulphide from turpentine.
    Author: Sinhmar PS, Gogate PR.
    Journal: Ultrason Sonochem; 2020 May; 63():104925. PubMed ID: 31945580.
    Abstract:
    A promising approach of ultrasound assisted oxidative desulfurization (UAOD) was studied for deep desulfurization of simulated sulphated turpentine containing dimethyl disulphide (DMDS) as model pollutant. The effect of ultrasound parameters such as power (80-120 W) and duty cycle (50-80%) as well as operating conditions as initial concentration (50-100 ppm), volume (100-300 ml) and temperature (28 °C as ambient condition, 50-70 °C) on the extent of desulfurization have been studied. The effect of addition of various oxidizing agents such as hydrogen peroxide over the range of 3-18 g/L, Fenton reagent by varying FeSO4 loading from 0.75 g/L to 1.75 g/L at constant H2O2 loading and titanium dioxide (loading over the range 1-4 g/L) in the presence of ultrasonic horn have also been investigated at laboratory scale. The addition of oxidizing agents in presence of ultrasound enhanced the extent of DMDS removal. The extent of desulfurization was found to be remarkably low for individual approaches as compared to combination approaches of US/oxidizing agents. The kinetic analysis revealed that oxidation follows first order kinetics. A significant increase in cavitational yield was observed for combination approach of US/H2O2/TiO2 (5.78 × 10-9 g/L) compared to individual ultrasound approach (2.04 × 10-9 g/L). Under best conditions of 120 W power, 70% duty cycle, 50 ppm initial concentration, 15 g/L H2O2 loading and 4 g/L TiO2 loading, 100% desulfurization was obtained at 23.19 Rs/L as the treatment cost. Based on the obtained results it can be concluded that US/H2O2/TiO2 approach is highly efficient desulfurization technique for deep desulfurization of simulated sulphated turpentine.
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