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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.
Mohammad Hadi Dehghani,Masoome Mostofi,Mahmood Alimohammadi,Gordon McKay,Kaan Yetilmezsoy,Ahmad B. Albadarin,Behzad Heibati,Mohammad Al Ghouti,N.M. Mubarak,J.N. Sahu 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-
The adsorption capabilities of two nano-sized adsorbents: multi-walled carbon nanotubes (MWCNTs)and single-walled carbon nanotubes (SWCNTs) were investigated for the removal of toxic phenol. Themaximum adsorption capacities of MWCNTs and SWCNTs were determined as 64.60 and 50.51 mg/g,respectively. Adsorption kinetics followed the pseudo-second order model for both adsorbents. Theoptimum conditions using SWCNTs and MWCNTs were pH 6.57 and 4.65, phenol concentration 50 and50 mg/L, dose 1.97 and 2 g/L and contact time 36 and 56 min, respectively. The results indicated thatMWCNTs and SWCNTs were proven as high-performance adsorbents for toxic phenol removal fromwastewater.