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Hollow fiber Silicalite-1 zeolite membrane for alkane separation in light naphtha

Authors： SUN Yaozhang1, LYU Shuyuan1, ZHANG Chun1, LI Jinzhi2, HU Rui1, YU Zhongwei2, GU Xuehong1

Units： 1. State Key Laboratory of Chemical Engineering of Materials, School of Chemical Engineering, Nanjing Tech University, Nanjing 211800, China; 2. Sinopec Petrochemical Research Institute Co., Ltd., Beijing 100083, China

KeyWords： hollow fiber; silicalite-1 zeolite membrane; light naphtha; vpor permeation; alkane separation

ClassificationCode：TQ028.1

year,volume(issue):pagination： 2025,45(2):109-116

Abstract：

Light naphtha is rich in C5 and C6 alkanes, so it is focused to develop the efficient and energy-saving technologies of separating n-alkane and i-alkanes. It will be helpful to realize the best use of industrial product. In this paper, Silicalite-1 (all-silica MFI) zeolite membranes were prepared on four-channel hollow fiber substrates and used for the separation of C5 or C6 alkane mixtures. Besides, the effects of operating conditions such as temperature and pressure on the performance of the prepared zeolite membranes were investigated. For the separation of n-pentane/isopentane (n-/i-C5) binary mixture, a n-C5 permeance of 1.12×10-7 mol/(m2·s·Pa) and the n-/i-C5 separation factor of 109 were achieved at 80 ℃ and the feed partial pressure of 5 kPa. For the separation of n-hexane/trimethylpentane/dimethylpentane (n-C6/3MP/2MP) ternary mixture at 80 ℃ and the 5 kPa feed partial pressure, the membrane showed a n-C6 permeance of 1.83×10-7 mol/(m2·s·Pa） and a n-/i-C6 separation factor of 132. At the same time, the operation stability under high feed partial pressure was evaluated. And the long-term stable operation can last more than 60 h. The results of this study will lay a foundation for technological innovation and upgrading in the petrochemical industry.

Funds：

中国石油化工股份有限公司委托项目（124056）

AuthorIntro：

孙耀璋（2001-），男，甘肃陇西人，硕士研究生，主要研究方向为分子筛膜的制备及应用

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