Evaluation of the Permeation of Syngas and Its Components through a Synthesized Matrimid Asymmetric Hollow-Fiber Membrane

Diana C. Calvo, Hye Youn Jang, Yi Ren, Omar Arafa, Ryan P. Lively, Bruce E. Rittmann, Cesar I. Torres

Research output: Contribution to journalArticlepeer-review

Abstract

Bioconversion of syngas (H2-CO-CO2) to organics is an excellent means of carbon recycling. Membrane-based gas-delivery systems can overcome the challenge of syngas’s low solubility in water. However, to maintain syngas conversion stoichiometry, it is crucial to have a membrane that delivers gases at high rates without selectivity toward any component. We synthesized an asymmetric, high-flux, low-selectivity hollow-fiber membrane, “small-defect-engineered”, to prevent bubble formation in future bioreactors. We created six sets of Matrimid membranes and screened their He/N2 selectivity and permeances. We compared the pressure-normalized flux of the set with the highest He/N2 permeance against a commercial symmetric membrane for a syngas mixture and its individual purified components. Under equal pressure, the asymmetric membrane exhibited 300-fold higher H2-flux, 80-fold higher CO-flux, and 100-fold higher CO2-flux than the symmetric membrane for pure gases. For the mixture, the asymmetric membrane had a 45-fold greater H2-flux, 100-fold greater CO-flux, and 400-fold greater CO2-flux than those of the symmetric membrane. Although the asymmetric membrane’s selectivity (H2:CO:CO2, 1:5.2:12) exceeded that of the commercial membranes (1:3:1.7), the asymmetric membrane possesses highly desirable traits for bioconversion of syngas, as its gas fluxes greatly exceed those of commercial membranes.

Original languageEnglish (US)
Pages (from-to)649-654
Number of pages6
JournalEnvironmental Science and Technology Letters
Volume10
Issue number8
DOIs
StatePublished - Aug 8 2023
Externally publishedYes

Keywords

  • asymmetric integrally skinned membrane
  • Matrimid
  • membrane selectivity
  • permeance
  • syngas

ASJC Scopus subject areas

  • Environmental Chemistry
  • Ecology
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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