Ultrafine tuning of the pore size in zeolite A for efficient propyne removal from propylene

doi:10.1016/j.cjche.2020.11.037

中国化学工程学报 ›› 2021, Vol. 37 ›› Issue (9): 217-221.DOI: 10.1016/j.cjche.2020.11.037

• Material and Product Engineering • 上一篇下一篇

Ultrafine tuning of the pore size in zeolite A for efficient propyne removal from propylene

Chaohui He¹, Rajamani Krishna², Yang Chen¹, Jiangfeng Yang¹, Jinping Li¹, Libo Li^1,3

1. College of Chemistry and Chemical Engineering, Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Taiyuan University of Technology, Taiyuan 030024, China;
2. Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, the Netherlands;
3. Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China

收稿日期:2020-09-29 修回日期:2020-11-03 出版日期:2021-09-28 发布日期:2021-11-02
通讯作者: Libo Li
基金资助:
We acknowledge the financial support from the National Natural Science Foundation of China (21922810, 21908153, 21908155) and program of Innovative Talents of Higher Education Institutions of Shanxi. We are grateful for the supported by Cultivate Scientific Research Excellence Programs of Higher Education Institutions in Shanxi (CSREP).

Ultrafine tuning of the pore size in zeolite A for efficient propyne removal from propylene

Chaohui He¹, Rajamani Krishna², Yang Chen¹, Jiangfeng Yang¹, Jinping Li¹, Libo Li^1,3

1. College of Chemistry and Chemical Engineering, Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Taiyuan University of Technology, Taiyuan 030024, China;
2. Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, the Netherlands;
3. Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China

Received:2020-09-29 Revised:2020-11-03 Online:2021-09-28 Published:2021-11-02
Contact: Libo Li
Supported by:
We acknowledge the financial support from the National Natural Science Foundation of China (21922810, 21908153, 21908155) and program of Innovative Talents of Higher Education Institutions of Shanxi. We are grateful for the supported by Cultivate Scientific Research Excellence Programs of Higher Education Institutions in Shanxi (CSREP).

摘要/Abstract

摘要： The removal of trace propyne (C₃H₄) from propyne/propylene (C₃H₄/C₃H₆) mixtures is a technical and challenging task during the production of polymer-grade propylene in view of their very similar size and physical properties. While some progress has been made, it is still very challenging to use some highly stable and commercially available porous materials via an energy-efficient adsorptive separation process. Herein, we report the ultrafine tuning of the pore apertures in type-A zeolites for the highly efficient removal of trace amounts of C₃H₄ from C₃H₄/C₃H₆ mixtures. The resulting ion-exchanged zeolite 5A exhibits a large C₃H₄ adsorption capacity (2.3 mmol g^-1 under 10^-4 MPa) and high C₃H₄/C₃H₆ selectivity at room temperature, which were mainly attributed to the ultrafine-tuned pore size that selectively blocks C₃H₆ molecules, while maintaining the strong adsorption of C₃H₄ at low pressure region. High purity of C₃H₆ (>99.9999%) can be directly obtained on this material under ambient conditions, as demonstrated by the experimental breakthrough curves obtained for both 1/99 and 0.1/99.9 (V/V) C₃H₄/C₃H₆ mixtures.

关键词: Type-A zeolite, Ion-exchange, Pore tuning, Propyne/propylene separation, Breakthrough experiments

Abstract: The removal of trace propyne (C₃H₄) from propyne/propylene (C₃H₄/C₃H₆) mixtures is a technical and challenging task during the production of polymer-grade propylene in view of their very similar size and physical properties. While some progress has been made, it is still very challenging to use some highly stable and commercially available porous materials via an energy-efficient adsorptive separation process. Herein, we report the ultrafine tuning of the pore apertures in type-A zeolites for the highly efficient removal of trace amounts of C₃H₄ from C₃H₄/C₃H₆ mixtures. The resulting ion-exchanged zeolite 5A exhibits a large C₃H₄ adsorption capacity (2.3 mmol g^-1 under 10^-4 MPa) and high C₃H₄/C₃H₆ selectivity at room temperature, which were mainly attributed to the ultrafine-tuned pore size that selectively blocks C₃H₆ molecules, while maintaining the strong adsorption of C₃H₄ at low pressure region. High purity of C₃H₆ (>99.9999%) can be directly obtained on this material under ambient conditions, as demonstrated by the experimental breakthrough curves obtained for both 1/99 and 0.1/99.9 (V/V) C₃H₄/C₃H₆ mixtures.

Key words: Type-A zeolite, Ion-exchange, Pore tuning, Propyne/propylene separation, Breakthrough experiments

Chaohui He, Rajamani Krishna, Yang Chen, Jiangfeng Yang, Jinping Li, Libo Li. Ultrafine tuning of the pore size in zeolite A for efficient propyne removal from propylene[J]. 中国化学工程学报, 2021, 37(9): 217-221.

Chaohui He, Rajamani Krishna, Yang Chen, Jiangfeng Yang, Jinping Li, Libo Li. Ultrafine tuning of the pore size in zeolite A for efficient propyne removal from propylene[J]. Chinese Journal of Chemical Engineering, 2021, 37(9): 217-221.

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Ultrafine tuning of the pore size in zeolite A for efficient propyne removal from propylene

Ultrafine tuning of the pore size in zeolite A for efficient propyne removal from propylene

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