Recovery of Iodine in the Gaseous Phase Using the Silicone Hollow Fiber Membrane Module
Iodine, being an important resource, must be recovered and reused. Iodine is not only attracted to the hydrophobic silicone membrane but also easily vaporized. In this study, we explored the use of five types of silicone hollow fiber membrane modules (SFMMs) for separating iodine in the gaseous phas...
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2025-01-01
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| author | Yoshio Yamabe Naotake Takahashi Jun Sawai Tamotsu Minami Mikio Kikuchi Toshimitsu Ishii |
| author_facet | Yoshio Yamabe Naotake Takahashi Jun Sawai Tamotsu Minami Mikio Kikuchi Toshimitsu Ishii |
| author_sort | Yoshio Yamabe |
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| description | Iodine, being an important resource, must be recovered and reused. Iodine is not only attracted to the hydrophobic silicone membrane but also easily vaporized. In this study, we explored the use of five types of silicone hollow fiber membrane modules (SFMMs) for separating iodine in the gaseous phase. In the SFMM, iodine gas and the recovery solution (sodium sulfite and sodium carbonate at a concentration of 10 mM each) were flowed outside and inside the silicone hollow fiber, respectively, in a co-current-flow manner. At an iodine gas flow rate of 0.2 L/min (8.4 × 10<sup>−3</sup> mmol-I<sub>2</sub>/L), the capture efficiency of iodine into the SFMM was approximately 100% for all five SFMMs. With increasing feed gas flow rates, the capture efficiency of iodine decreased, reducing to approximately 50% at 0.8 L/min. However, the recovery efficiency of iodine in the recovery solution was 60–30% at 0.2–0.8 L/min. This decrease in capture efficiency with increasing flow rates was because iodine could not spread and diffuse successfully in the SFMM, resulting in a low recovery efficiency of iodine. Thus, we next improved the structure of the SFMM by placing a perforated pipe in the center of the module. The perforated pipe effectively directs the iodine feed gas from the holes in the pipe to the hollow fiber membrane bundle wrapped around the pipe. With the improved SFMM, the capture efficiency markedly increased to approximately 100% in the range of the flow rates tested in our experiments. The recovery efficiency also increased to ≥70%. These data illustrate the potential application of the improved SFMM for recovering iodine in the gaseous phase. |
| format | Article |
| id | doaj-art-3a32a511370643e48ec598ba52407128 |
| institution | Kabale University |
| issn | 2077-0375 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Membranes |
| spelling | doaj-art-3a32a511370643e48ec598ba524071282025-01-24T13:41:04ZengMDPI AGMembranes2077-03752025-01-011512710.3390/membranes15010027Recovery of Iodine in the Gaseous Phase Using the Silicone Hollow Fiber Membrane ModuleYoshio Yamabe0Naotake Takahashi1Jun Sawai2Tamotsu Minami3Mikio Kikuchi4Toshimitsu Ishii5Department of Applied Chemistry, Faculty of Engineering, Kanagawa Institute of Technology, 1030 Shimo-Ogino, Atsugi 243-0292, JapanDepartment of Applied Chemistry, Faculty of Engineering, Kanagawa Institute of Technology, 1030 Shimo-Ogino, Atsugi 243-0292, JapanDepartment of Nutrition and Life Science, Faculty of Health and Medical Sciences, Kanagawa Institute of Technology, 1030 Shimo-Ogino, Atsugi 243-0292, JapanDepartment of Applied Chemistry, Faculty of Engineering, Kanagawa Institute of Technology, 1030 Shimo-Ogino, Atsugi 243-0292, JapanFaculty of Applied Bioscience, Kanagawa Institute of Technology, 1030 Shimo-Ogino, Atsugi 243-0292, JapanGodo Shigen Co., Ltd., 1545-1 Nanaido, Chosei-mura, Chiba 299-4333, JapanIodine, being an important resource, must be recovered and reused. Iodine is not only attracted to the hydrophobic silicone membrane but also easily vaporized. In this study, we explored the use of five types of silicone hollow fiber membrane modules (SFMMs) for separating iodine in the gaseous phase. In the SFMM, iodine gas and the recovery solution (sodium sulfite and sodium carbonate at a concentration of 10 mM each) were flowed outside and inside the silicone hollow fiber, respectively, in a co-current-flow manner. At an iodine gas flow rate of 0.2 L/min (8.4 × 10<sup>−3</sup> mmol-I<sub>2</sub>/L), the capture efficiency of iodine into the SFMM was approximately 100% for all five SFMMs. With increasing feed gas flow rates, the capture efficiency of iodine decreased, reducing to approximately 50% at 0.8 L/min. However, the recovery efficiency of iodine in the recovery solution was 60–30% at 0.2–0.8 L/min. This decrease in capture efficiency with increasing flow rates was because iodine could not spread and diffuse successfully in the SFMM, resulting in a low recovery efficiency of iodine. Thus, we next improved the structure of the SFMM by placing a perforated pipe in the center of the module. The perforated pipe effectively directs the iodine feed gas from the holes in the pipe to the hollow fiber membrane bundle wrapped around the pipe. With the improved SFMM, the capture efficiency markedly increased to approximately 100% in the range of the flow rates tested in our experiments. The recovery efficiency also increased to ≥70%. These data illustrate the potential application of the improved SFMM for recovering iodine in the gaseous phase.https://www.mdpi.com/2077-0375/15/1/27membrane separationpermeation and chemical desorption methodpolydimethylsiloxanesilicone hollow fiber membraneiodine |
| spellingShingle | Yoshio Yamabe Naotake Takahashi Jun Sawai Tamotsu Minami Mikio Kikuchi Toshimitsu Ishii Recovery of Iodine in the Gaseous Phase Using the Silicone Hollow Fiber Membrane Module Membranes membrane separation permeation and chemical desorption method polydimethylsiloxane silicone hollow fiber membrane iodine |
| title | Recovery of Iodine in the Gaseous Phase Using the Silicone Hollow Fiber Membrane Module |
| title_full | Recovery of Iodine in the Gaseous Phase Using the Silicone Hollow Fiber Membrane Module |
| title_fullStr | Recovery of Iodine in the Gaseous Phase Using the Silicone Hollow Fiber Membrane Module |
| title_full_unstemmed | Recovery of Iodine in the Gaseous Phase Using the Silicone Hollow Fiber Membrane Module |
| title_short | Recovery of Iodine in the Gaseous Phase Using the Silicone Hollow Fiber Membrane Module |
| title_sort | recovery of iodine in the gaseous phase using the silicone hollow fiber membrane module |
| topic | membrane separation permeation and chemical desorption method polydimethylsiloxane silicone hollow fiber membrane iodine |
| url | https://www.mdpi.com/2077-0375/15/1/27 |
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