Imorb, Karittha

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Imorb, Karittha
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Im-orb, Karittha
Im-Orb, Karittha
Im-orb, K.
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karittha.im@kmitl.ac.th

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    Item type:Publication,
    Exergy and exergoeconomic analyses of sustainable furfural production via reactive distillation
    (2021-07-01)
    Wiranarongkorn, Kunlanan
    ;
    Im-orb, Karittha
    ;
    Panpranot, Joongjai
    ;
    Maréchal, François
    ;
    Arpornwichanop, Amornchai
    Lignocellulosic biomass is a potential renewable resource for production of high-value, sustainable products. Furfural is among the important bio-based chemicals in biorefineries. However, the conventional process of furfural production using a reaction-separation network entails low product yield but high fixed and operating costs owing to the complex process of separation. In this study, a process of furfural production via reactive distillation (RD) was investigated and designed based on the concept of process intensification. Exergy and exergoeconomic analyses were applied to evaluate the process performance. When the RD column was operated at its optimal configuration, furfural production of 81.78 kg h<sup>−1</sup> was achieved with xylose conversion and furfural yield of 97.9% and 97.4%, respectively. The exergy efficiency of furfural production was 56.41%, while the RD column exhibited the maximum exergy destruction rate among all components with an exergy efficiency of 69.82%. The exergy destruction rate declined with decrease in the reboiler duty of the RD column and increase in xylose concentration. The exergoeconomic analysis revealed that decreasing the reboiler duty had the highest impact on the total cost of furfural production. Decreases in feedstock and catalyst costs as well as interest rate additionally lowered the total cost rate of the system.
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    Flowsheet-based model and exergy analysis of solid oxide electrolysis cells for clean hydrogen production
    (2018-01-01)
    Im-orb, Karittha
    ;
    Visitdumrongkul, Nuttawut
    ;
    Saebea, Dang
    ;
    Patcharavorachot, Yaneeporn
    ;
    Arpornwichanop, Amornchai
    A solid oxide electrolysis cell (SOEC) is an electrochemical technology used for hydrogen production via a steam electrolysis reaction. Because the existing SOEC models are complicated, the aim of this study is to develop a user-friendly SOEC model in a flowsheet simulator (Aspen Plus). The developed model is used to perform a parametric analysis to investigate the effects of key process parameters, i.e., operating temperature, current density, steam concentration, sweep gas type and number of cells, on the SOEC performance. The simulation results show that the voltage and the overall overpotential decrease as the cell temperature increases, whereas the opposite trends are observed when the current density increases. From the energy and exergy analyses, the total energy demand slightly increases with cell temperature, whereas the electrical energy demand decreases. Based on an operating temperature of 1273 K when the SOEC uses oxygen as the sweep gas, the highest energy and exergetic efficiencies of 78.45% and 92.20% are achieved at a current density of 2500 A m<sup>−2</sup> and at a steam concentration of 90% in a 500-cell stack.