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RISS 인기검색어
- 검색키워드
- 저자 : Antonio Tripodi (검색결과 3 건)
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Antonio Tripodi,Dario Manzini,Matteo Compagnoni,Gianguido Ramis,Ilenia Rossetti 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-
The feasibility and performance of different strategies to purify a complex mixture of H2O/CH3CN/NH3/HCN from bioethanol ammoxidation are compared. Dichloromethane as entrainer is taken as a base case and compared with more sustainable molecules, such as ethyl acetate (EA), ethylene glycol (EG) and glycerol (G). The thermodynamic behavior of the homogeneous or heterogeneous mixtures is first discussed. Then, the separation and purification section is designed accordingly. To yield high-purity acetonitrile a low-boiling entrainer (EA) is preferable. If economic issues prevail, then EG grants a lighter sizing of the equipment and lower heat duties. Similar recoveries of acetonitrile, ranging from 90 (EG and G) to 92% (DCM and EA) were achieved when comparing the different entrainers. Higher purities are obtained with the lower-boiling additives with respect to acetonitrile, leading to purity >99.99% for DCM and EA, >99.6% for EG and >99% for G. This acetonitrile purification section is part of a full integrated plant, newly designed for the production of this commodity from renewable sources, since no commercial examples of bioethanol-to-acetonitrile plants are disclosed in the literature.
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Antonio Tripodi,Matteo Compagnoni,Elnaz Bahadori,Ilenia Rossetti 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.66 No.-
Ammonia synthesis over different iron- and ruthenium-based catalysts was modelled with appropriate rate models, used for the simulation of the process under different configurations and conditions. The kinetic models have been simulated and validated against experimental data. A scaled up reactor has been designed, at first with a once through configuration. On this model reactor we performed a sensitivity analysis to optimise the reaction conditions. Then, the sizing of an ammonia separation unit and the optimisation of the recycle loop allowed to compare different possible configurations. A multibed catalytic reactor with intercooling was then designed, using the same catalyst or different catalyst types properly to maximise the ammonia productivity. In particular, Fe-based catalysts were followed by the Ru/C one, in order to push the ammonia productivity towards the equilibrium value. The goal of the work is the design of an ammonia synthesis loop which couples different catalysts towards the optimisation of productivity and cost of operation and installation.
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Ethylene from renewable ethanol: Process optimization and economic feasibility assessment
Martina Frosi,Antonio Tripodi,Francesco Conte,Gianguido Ramis,Nader Mahinpey,Ilenia Rossetti 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.104 No.-
At present, ethylene is the most widely produced organic compound in the chemical industry. The maincommercial way to obtain ethylene is by steam cracking of a wide range of hydrocarbon feedstocks, butbiomass-derived ethanol can be catalytically dehydrated as a sustainable alternative route in order toexploit new renewable sources. The aim of this work is to design an optimal bioethanol-tobioethyleneplant, with a capacity of 445,652 ton/year, and to assess its economic feasibility. This designfeatures an improved production capacity and intensified energy management. The main novelty of this study is the use of diluted bioethanol solutions, bypassing the energy intensiveand expensive dehydration step. Moreover, while the first industrial bioethanol-to-bioethylene processuses NaOH to purify the outcoming flow from CO2, this plant uses diluted Methyldiethanolamine(MDEA), regenerated in situ. With this plant, the double of the capacity of the Braskem’s plant, nowthe largest one, can be reached in an environmentally more sustainable manner. A pinch analysis was performed, in order to minimize the energy consumption of the process by optimizingthe heat recovery systems. The economic analysis of the process consists of the evaluation of thetotal cost of the plant (TOC) including the sum of the CAPital EXpenditures (CAPEX) and the OPeratingones (OPEX), together with some sensitive profitability indexes (net yearly profit, net present value,net rate of return and cash flow analysis). The designed process presents an economically competitivesolution compared to the current bioethylene production units. Assuming a premium price of between 0.293 $/kg for diluted bioethanol, the proposed plant is competitivewith the lowest production cost for bioethylene (Brazil and India), while a sensitivity analysis ondiluted bioethanol price evidenced that this option remains competitive still in Europe with a bioethanolcost 0.65 $/kg.
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