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RISS 인기검색어
- 검색키워드
- 저자 : Masoud Mandooie (검색결과 3 건)
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Masoud Mandooie,Ehsan Salehi 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.125 No.-
Anhydrous zinc acetate was used as a low-cost catalyst for the urea alcoholysis to produce dimethyl carbonate(DMC). Important operating variables including reaction time, temperature and catalyst amountwere optimized using response surface methodology. Optimization was assessed through two differentapproaches. In the first approach, only DMC yield was maximized. N-methyl methyl carbamate(NMMC, the unfavorable byproduct) yield was minimized along with maximizing DMC yield in the secondapproach. Sobol sensitivity analysis uncovered that reaction temperature and the binary interactionof reaction temperature/catalyst amount were the most influential parameters on DMC yield with 57.01%and 29.17% impacts, respectively. Moreover, temperature and reaction time with 61.13% and 19.74%impacts were the most effective variables on NMMC yield. The multi-objective optimization results weremore suitable for application in continuous production of DMC due to avoiding NMMC production. Amodified continuous process was also proposed for DMC production. The main advantage of the preposedprocess was immediate extraction out of DMC from the reaction zone. To investigate the possible reactionmechanism, the Binding Energies (BEs) of the reactants were assessed using Density-Functional-Theory. Results illustrated that the highest BE values belong to the interaction of zinc with the nitrogen of methylcarbamate (MC).
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Masoud Mandooie,Mahdi Rahimi,Golara Nikravesh,Ehsan Salehi 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-
Urea alcoholysis is one of the environmental-friendly and economic methods for dimethyl carbonate(DMC) production. Various catalysts such as bases, organic tin, acids, ionic liquids and metal oxides havebeen used for synthesis of DMC through urea alcoholysis process. Based on literature survey, catalystscontaining both acidic and basic sites, are more suited for catalyzing the reaction; however, the basicityplays more conspicuous role. Zinc-based mixed metal oxides (MMOs) have emerged as potential catalystsfor this purpose mainly due to the amphoteric nature of ZnO as well as basic/acidic sites abundance. Thisarticle reviews zinc-based MMO catalysts focusing on catalytic performances and mechanisms, synthesizingmethods, characterizations and operating conditions of the reactors during a 20-years period. Literature survey uncovered that pure ZnO catalyst could exhibit a maximum of 37% DMC yield underthe utmost operating conditions. However, zinc-based MMO catalysts (binary or ternary) showed superiorperformance in DMC conversion through the urea alcoholysis process, usually under moderate operatingconditions, mainly due to synergetic effects among metal oxide phases. Among MMO catalysts,ZnO/CaO binary metal oxide and Zn/Ce/La ternary metal oxide catalysts tabulated the highest DMC productionyields of 41.2% and 50.4% respectively. Moreover, two different catalyst-test modes includingbatch and continuous, and three catalyst synthesizing methods including sol–gel, co-precipitation andurea precipitation (UPM) have been spotlighted in this review.
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Mahdi Rahimi,Ehsan Salehi,Masoud Mandooie,Nayyereh Khalili 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.120 No.-
For the first time, the ethyl acetate production plant wastewater was treated using a batch adsorption/ozonation integrated process. The wastewater contained alcoholic pollutants (majorly, ethanol) andthe discharge of this wastewater could result in serious risks to the environment. The operational variablesincluding reaction time (10 to 60 min), temperature (20 to 60 C), ozone flowrate (4 to 12 L/min)and granular activated carbon (GAC) dose (5 to 15 g) were optimized by applying response surfacemethodology, where the removal of chemical oxygen demand (COD) was aimed to be maximized asthe target variable. The optimal conditions were obtained at the reaction time of 60 min, temperatureof 60 C, GAC dose of 10 g and ozone flowrate of 8 L/min, which resulted in COD removal of 98.5 %. Characterization analyses revealed that ozonation could support in-situ regeneration of the GAC and providea synergistic effect on the COD removal enhancement. The separation kinetics of the integrated processwas also assessed and found to be superior than those of the standalone operations. Sobol sensitivityanalysis results uncovered that the reaction temperature by 85 % and the binary interaction of the reactiontime and temperature by near 7 % impact shares were the most effective parameters on the CODremoval. Isothermal studies showed that the adsorption of ethanol on GAC is physical, multilayer andheterogeneous. Consequently, the integrated adsorption/ozonation process has been approved as apotential method for the treatment of ethyl acetate plant wastewater.
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