547089 Chemical Looping Reforming for the Production of Hydrogen and Chemicals from Natural Gas

Wednesday, June 5, 2019: 2:18 PM
Texas Ballroom D (Grand Hyatt San Antonio)
Andrew Tong, Tien-Lin Hsieh, Dikai Xu, Yitao Zhang, Dawei Wang, Sourabh Nadgouda, Mandar Kathe, Fanhe Kong and Liang-Shih Fan, William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH

Though the use of the oxidation-reduction chemical looping reaction pathway for producing chemical products and industrial gases dates back over 100 years, no chemical looping technology is in practice today at the commercial production scale due, in part, to limitations in the performance and recyclability of the redox material used as the oxygen carrier, the reactor design, and the interconnecting reactor components used. The chemical looping reaction pathway offers many advantages for increased material, heat, and functional step integration. The present paper summarizes the chemical looping processes The Ohio State University (OSU) is developing for syngas production of chemical product applications and hydrogen production for industrial gas supply. The iron titanium complex metal oxide (ITCMO) developed is capable of sustaining over 3,000 redox cycles without loss in strength and reactivity. The syngas chemical looping process, developed for high purity hydrogen generation from fossil fuels using a counter current moving bed reducer design, was tested at the 250 kWth capacity for approximately 1,000 hours. The use of chemical looping to produce syngas is advantageous as it eliminates the need for an air separation unit. The type of metal oxides used as the active oxygen carrier also dictate the purity and quality of the syngas produced. A concurrent moving bed reducer reactor is used to for precise control of the oxidation state of the oxygen carrier throughout the reactor to maximize natural gas conversion and syngas purity. Multiple cases of the OSU chemical looping processes for syngas production are considered using ASPEN Plus process modelling to determine optimum process configurations that efficiently converts natural gas to syngas for producing methanol or other chemical products with minimal to negative CO2 emissions. Experimental studies in the 15 kWth sub-pilot scale and 1.5 kWth bench-scale chemical looping reactors confirm the flexibility of the co-current moving bed design and ITCMO oxygen carrier for producing syngas with a wide range of CO/H2 ratios using natural gas, CO2 and steam as reactants. Results from the experimental studies and economic assessments of the chemical looping processes for syngas production will be presented.

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