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A novel desulfurization practice based on diesel acidification prior to activated carbon adsorption
Mohammad Ahmad Al-Ghouti,Yahya Salem Al-Degs 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.4
Commercial diesel is often rich with organosulfur compounds and a value of 7,100 mgS/kg was recentlyreported. As confirmed by chromatographic analysis, about 36% of sulfur compounds are originated from dibenzothiophene. Following uncommon desulfurization method, organosulfur compounds were efficiently removed upon dieselacidification by organic acids prior to activated carbon adsorption. Protonation of S-containing compounds has enhancedtheir uptake by activated carbon. Competitive adsorption of di/tri/tetra-aromatics and dibenzothiophene fromsynthetic fuel proved that the later solute was preferentially removed against other aromatics upon fuel acidification. Results showed that 48% of organosulfur compounds were eliminated upon adding acetic acid to a final content of 3%by vol.. Principal component analysis indicated that acid content and carbon mass are the most significant factors onorganosulfur compounds removal: %Removal=5.8 (Acid Content)+6.3 (Mass)−0.02 (PD)−0.90 (Temp). The practicalefficiency of the proposed method was demonstrated by removing organosulfur compounds from commercial diesel.