n-Octyltrichlorosilane Modified SAPO-34/PDMS Mixed Matrix Membranes for Propane/Nitrogen Mixture Separation

Separations

Jiding Li¹  Yujun Wang¹  Jingyu Luo²  Weibin Cai²  Xiaohan Chen²  Jiangyu Xie²  Mingqian Wang² 

[1] Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China;

关键词: MMMs;    SAPO-34;    PDMS;    OTCS;    propane recovery;   

DOI  :  10.3390/separations9030064

来源: DOAJ

【 摘 要 】

In this study, zeolite molecular sieve SAPO-34/polydimethylsiloxane (PDMS) mixed matrix membranes (MMMs) were prepared to recover propane. n-Octyltrichlorosilane (OTCS) was introduced to improve compatibility between SAPO-34 and PDMS, and enhance the separation performance of the MMMs. Physicochemical properties of the MMMs were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and water contact angle (WCA). Results showed that, after modification, alkyl chains were successfully grafted onto SAPO-34 without changing its crystal structure, particles in the MMMs were evenly distributed in the base film, and the hydrophobicity of the MMMs was enhanced. Moreover, the effects of SAPO-34 filling content, operating pressure, and feed gas concentration on the separation performance was explored. This indicated that the modification with OTCS effectively enhanced the separation performance of SAPO-34/PDMS MMMs. When the filling content of modified SAPO-34 was 15%, the maximal separation factor of 22.1 was achieved, and the corresponding propane permeation rate was 101 GPU.

【 授权许可】

Unknown