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Author: search.filters.author.Im-orb, KaritthaSubject: search.filters.subject.Bio-methanol

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    Comparative techno-economic assessment of bio-methanol and bio-DME production from oil palm residue
    (2022-04-15)
    Im-orb, Karittha
    ;
    Arpornwichanop, Amornchai
    The techno-economic assessment was performed to investigate and compare the production of bio-methanol and bio-dimethyl ether (bio-DME) via the combined gasification and chemical synthesis processes (i.e., gasification-methanol (MeOH) and gasification-DME). The combined processes were simulated using oxygen as a gasifying agent and the oil palm trunk, the agricultural waste generated from the palm oil industry, as feedstock. The gasification-MeOH process offered a higher amount of valuable product (methanol) and released a larger amount of CO<inf>2</inf>. The energy analysis indicated the two biomass conversion processes were exothermic process. The gasification-DME process presented a higher biomass conversion efficiency of 59.5% compared to 47.6% of the gasification-MeOH. The pinch analysis of gasification-MeOH and the gasification-DME processes indicated threshold pinch that required only cold utility of 0.5542 kW and 0.7258 kW, respectively. Regarding the economic aspect, the two processes were still not economically feasible, and the methanol and DME prices and the project lifetime influenced their economic performance. However, due to the high product price, the gasification-DME process was approximately 7% more economically feasible than the gasification-MeOH process.
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    Bio-methanol production from oil palm residues: A thermodynamic analysis
    (2020-12-15)
    Im-orb, Karittha
    ;
    Phan, Anh N.
    ;
    Arpornwichanop, Amornchai
    The thermodynamic analysis of bio-methanol production from oil palm residues was performed using a process model developed in Aspen Plus. Among the different types of oil palm residues, i.e., trunk, frond, and empty fruit bunch, the trunk residue offers the highest synthesis gas (syngas) (H<inf>2</inf> and CO) yields via the gasification process; therefore, it was selected as the biomass model compound. The effect of gasification operating conditions on the syngas composition, yield, bio-methanol production, energy consumption, and exergy performance was examined. The yield of syngas increased with increasing gasifying temperature, whereas that of bio-methanol exhibited the opposite trend due to the decrease in H<inf>2</inf> concentration of the syngas. The gasifier was an important unit for enhancing the exergy efficiency of the system, which was decreased when the equivalent ratio (ER) and gasifying temperature increased. Recirculating pressure swing adsorption offgas to the gasifier did not benefit bio-methanol production, nor did it improve energy and exergy performance. The maximum yield of bio-methanol was achieved by a once-through process that maintained the gasifying temperature at 750 °C and ER at 0.25. Under these conditions, the maximum energy and exergy efficiencies were 38.57 and 25.44%, respectively.