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Multiscale design of a pressure swing adsorption process for natural gas purification

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Abstract

Adsorption processes with activated carbons can be used to remove heavy hydrocarbons from a natural gas flow. Using the Pressure Swing Adsorption (PSA) technology, one can introduce a flexible solution in pre-existing gas-processing units to deal with new marked demands, as for example a C3+ free gas composition to be used as adsorbed natural gas to vehicles fuel tanks. However, designing a PSA process is a laborious task because several cycle configurations and materials are available to perform the separation. To fulfill such task, a multiscale procedure is proposed. Molecular simulation, through Grand Canonical Monte Carlo (GCMC) method, was used to obtain adsorption isotherms for natural gas components in three different carbons: WV-1050, NORIT R1 and MAXSORB. Bed geometry was set based on the minimum fluidization velocity and on the working capacity of the adsorbents. Working capacities were calculated using Langmuir Isotherm applied to Ideal Adsorbed Solution Theory (IAST) to represent the mixture. Each PSA column was simulated in Aspen Adsorption® and operates according to a four steps cycle (Skarstrom cycle): pressurization, adsorption at 40 bar, blowdown, and purge at 1 bar. The operating conditions of the process (such as flowrates, bed geometry and step times) were optimized, seeking the maximization of the process performance parameters: purity, recovery and productivity. A preliminary design of the PSA unit indicates the carbon WV1050 as the best adsorbent to produce C3+ free gas fuel, ideal for storage by adsorption.

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Authors and Affiliations

  1. Laboratory of Modeling and 3D Visualization, GPSA, Departamento de Engenharia Química, Universidade Federal do Ceará, Campus do Pici, Bloco 709, Fortaleza, CE, 60455-760, Brazil

    Isabella C. C. Quaranta, Larissa S. Pinheiro, Daniel V. Gonçalves, Hugo R. Peixoto & Sebastião M. P. Lucena

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  1. Isabella C. C. Quaranta
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  2. Larissa S. Pinheiro
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  5. Sebastião M. P. Lucena
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Quaranta, I.C.C., Pinheiro, L.S., Gonçalves, D.V. et al. Multiscale design of a pressure swing adsorption process for natural gas purification. Adsorption 27, 1055–1066 (2021). https://doi.org/10.1007/s10450-021-00330-y

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