LTA zeolite membranes on thin-walled capillary tubes for the high-throughput dehydration of industrially important ternary water/isopropanol/epichlorohydrin mixtures

Pyoseop Kim, Yong Sung Kwon, Minseong Lee, Dae Hun Kim, You In Park, Nakwon Choi, Seung Eun Nam, Jungkyu Choi

Research output: Contribution to journalArticlepeer-review

Abstract

Among the various zeolite membranes, hydrophilic Linde Type A (LTA) zeolite membranes (LTA membranes) are highly desirable for the dehydration of organic solvents. In particular, both high flux and separation factors for H2O can be achieved with such membranes. Therefore, in this study, we fabricated LTA membranes on thin-walled capillary tubes and compared the dehydration performance with those of LTA membranes prepared on conventional tubular supports. We found that neither LTA membrane contained noticeable defects using fluorescence confocal optical microscopy analysis. Accordingly, both membranes effectively dehydrated an azeotropic ternary mixture of H2O/isopropanol (IPA)/epichlorohydrin (ECH), an industrially important mixture. Specifically, the capillary-supported LTA membrane showed better dehydration performance than that on the conventional tubular support, mainly because of the relatively thinner support thickness (ca. 0.35 mm vs. 2 mm of the conventional tubular support). The corresponding H2O flux was ca. 8.02 ± 0.94 kg·m−2·h−1 for the azeotropic ternary mixture (20 wt% H2O/30 wt% IPA/50 wt% ECH) at 70 °C (vs. 4.26 ± 0.39 kg·m−2·h−1 through the LTA membrane on the conventional tube). Further, the H2O/IPA and H2O/ECH separation factors exceeded approximately 10,000. Finally, a comparison with the literature data revealed that the capillary-supported LTA membrane had higher H2O flux and selectivity for H2O/IPA mixtures than other LTA membranes prepared on conventional discs/sheets/tubes.

Original languageEnglish
Article number123733
JournalSeparation and Purification Technology
Volume315
DOIs
Publication statusPublished - 2023 Jun 15

Bibliographical note

Funding Information:
This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (no. 20202020800330). In addition, this work was supported by the Mid-Career Researcher Program (2020R1A2C1101974) through the National Research Foundation of Korea , funded by the Korea government. FCOM characterizations were carried out at the KIST, while EDX characterization were conducted at the KBSI (Seoul Center).

Funding Information:
This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (no. 20202020800330). In addition, this work was supported by the Mid-Career Researcher Program (2020R1A2C1101974) through the National Research Foundation of Korea, funded by the Korea government. FCOM characterizations were carried out at the KIST, while EDX characterization were conducted at the KBSI (Seoul Center).

Publisher Copyright:
© 2023 Elsevier B.V.

Keywords

  • Capillary tube
  • HO/isopropanol/epichlorohydrin separation
  • LTA zeolite membrane
  • Pervaporation
  • Secondary growth

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

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