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RISS 인기검색어
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- 저자 : Z. Dehghani (검색결과 2 건)
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Membrane/sorption-enhanced methanol synthesis process: Dynamic simulation and optimization
M. Bayat,Z. Dehghani,M.R. Rahimpour 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
In this study, a dynamic mathematical model of a Membrane-Gas-Flowing Solids-Fixed Bed Reactor (Membrane-GFSFBR) with in-situ water adsorption in the presence of catalyst deactivation is proposed for methanol synthesis. The novel reactor consists of water adsorbent and hydrogen-permselective Pd-Ag membrane. In this configuration feed gas and flowing adsorbents are both fed into the outer tube of the reactor. Contact of gas and fine solids particles inside packed bed results in selective adsorption of water from methanol synthesis which leads to higher methanol production rate. Afterwards, the high pressure product is recycled to the inner tube of the reactor and hydrogen permeates to the outer tube which shifts the reaction towards more methanol production. Dynamic simulation result reveals that simultaneous application of water adsorbent and hydrogen permeation in methanol synthesis process contributes to a significant enhancement in methanol production. The notable advantage of Membrane-GFSFBR is the continuous adsorbent regeneration during the process. Moreover, a theoretical investigation has been performed to evaluate the optimal operating conditions and to maximize the methanol production in Membrane-GFSFBR using differential evolution (DE) algorithm as a robust method. The obtained optimization result shows there are optimum values of inlet temperatures of gas phase, flowing solids phase, and shell side under which the highest methanol production can be achieved.
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M. Bayat,M.R. Rahimpour,M. Hamidi,Z. Dehghani 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
Fischer–Tropsch synthesis (FTS) plays an important role in the production of clean liquid transportationfuels, chemicals, and other hydrocarbon products. This work proposes a novel configuration of FTSreactor in which zeolite 4A, with the composition of Na12(Si12Al12O48)-27H2O, is considered as wateradsorbent. For this purpose, a gas-flowing solids-fixed bed reactor (GFSFBR) is used instead ofconventional reactor. The main advantage of GFSFBR over the conventional sorption-enhanced reactionprocess is the continuous adsorbent regeneration in this novel configuration. Simulation resultdemonstrates that selective adsorption of water from FTS in GFSFBR leads to significant enhancement inthe gasoline yield and reduction in CO2 production in comparison with the zero solid mass flux condition. Subsequently, the aforementioned reactor is optimized using differential evolution (DE) algorithm as aneffective and robust optimization method. Optimization results show that there are optimum values foreight decision variables under which the highest gasoline productivity can be achieved. Afterwards, thesimulation and optimization results are compared with the ones in conventional reactor. This papershows how the concept of in situ water adsorption is feasible and beneficial for FTS.
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