Bioethanol enrichment using zeolite membranes: Molecular modeling, conceptual process design and techno-economic analysis

Mittal, Nitish; Bai, Peng; Siepmann, J. Ilja; Daoutidis, Prodromos; Tsapatsis, Michael

doi:10.1016/j.memsci.2017.06.075

Title: Bioethanol enrichment using zeolite membranes: Molecular modeling, conceptual process design and techno-economic analysis

Journal Article · 28 June 2017 · Journal of Membrane Science

DOI: https://doi.org/10.1016/j.memsci.2017.06.075 · OSTI ID:1538583

Mittal, Nitish ^[1]; Bai, Peng ^[1]; Siepmann, J. Ilja ^[1]; Daoutidis, Prodromos ^[1]; Tsapatsis, Michael ^[1]

Univ. of Minnesota, Minneapolis, MN (United States)

Lignocellulosic biomass-derived ethanol offers a potential alternative to fossil-derived fuels. However, the energy-intensive nature of its recovery process, i.e., a sequence of two distillation columns – beer and rectification columns - enriching from 5 to 37, and 37–93 wt%, respectively, limits its environmental and economic benefits. Here, in this paper, we assess the potential of using zeolite membranes for bioethanol recovery. Atomistic-level and molecular dynamic simulations are performed to determine adsorption and diffusion properties of the ethanol-water mixture in zeolite membranes. These properties are modeled using the real adsorption solution theory and the Maxwell-Stefan equations to describe permeation through the zeolite membranes. A comparison of steady state permeance and selectivity predicted by the model with the values from experiments suggests that the simulated membranes are more permeable and selective than the real membranes. This is attributed to the presence of structural non-idealities and hydrophilic defects in real membranes, while the adsorption and diffusion properties obtained using molecular simulations reflect the behavior in ideal crystals. Thus, a reduced diffusivity model with an empirical relation for enhanced water adsorption is used to capture similar performance as that obtained by real membranes. This model is further used in developing conceptual process designs to assess the viability of zeolite membranes for bioethanol enrichment in industry. Both hydrophobic and hydrophilic zeolite membranes are considered. Hydrophobic zeolite membranes show potential for energy savings but lack in separation performance. On the other hand, hydrophilic zeolite membranes can achieve the separation target but result in no energy savings. Thus, a configuration that uses a combination of hydrophobic and hydrophilic membranes is proposed. It can achieve the separation target and results in 15% energy savings over distillation. Techno-economic analysis suggests that ~ 10-fold improvements in permeation or equivalent cost reductions are required for economic viability of this scheme.

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Research Organization:: Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AR0000338; SC0008688; FG02-12ER16362

OSTI ID:: 1538583

Alternate ID(s):: OSTI ID: 1495735

Journal Information:: Journal of Membrane Science, Vol. 540, Issue C; ISSN 0376-7388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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