CIESC Journal ›› 2022, Vol. 73 ›› Issue (10): 4527-4538.DOI: 10.11949/0438-1157.20220628

• Separation engineering • Previous Articles     Next Articles

Preparation of Pebax/a-MoS2/MIP-202 mixed matrix membranes for CO2 separation

Zhuo JIN1(), Yonghong WANG1,2(), Xinru ZHANG1,2, Xue BAI1, Jinping LI1,2   

  1. 1.College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
    2.Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Taiyuan 030024, Shanxi, China
  • Received:2022-05-05 Revised:2022-07-28 Online:2022-11-02 Published:2022-10-05
  • Contact: Yonghong WANG

Pebax/a-MoS2/MIP-202混合基质膜的制备及CO2分离性能

靳卓1(), 王永洪1,2(), 张新儒1,2, 白雪1, 李晋平1,2   

  1. 1.太原理工大学化学工程与技术学院,山西 太原 030024
    2.气体能源高效清洁利用山西省重点实验室,山西 太原 030024
  • 通讯作者: 王永洪
  • 作者简介:靳卓(1996—),女,硕士研究生,jin15535108261@163.com
  • 基金资助:
    国家自然科学基金面上项目(22078216);山西省回国留学人员科研资助项目(2021-056);山西省自然科学基金面上项目(20210302123196)

Abstract:

To obtain high-performance CO2/N2 separation membranes, a dual-functional filler prepared by mechanochemistry reaction of oxygen-etched molybdenum disulfide (a-MoS2) and metal-organic framework material MIP-202 was used as the dispersed phase, and polyether block amide (Pebax-1657) was served as a continuous phase, and Pebax/a-MoS2/MIP-202 mixed matrix membranes (MMMs) were prepared by solution casting. The chemical structure of filler was characterized by FT-IR. The chemical structure, microscopic structure, thermal stability and physical mechanical properties of MMMs were characterized by ATR-FTIR, SEM, TG and mechanical property testing. The effects of water content, dual-functional filler ratio, dual-functional filler content, feed pressure and operating temperature on the gas separation performance of the membranes were studied, and the long-time stability of MMMs under simulated flue gas (CO2/N2 volume ratio 15/85) conditions was investigated. The results showed that the best CO2 permeability of MMMs was 380 Barrer with a CO2/N2 selectivity of 124.7 at 25℃ and 0.1 MPa, surpassing the upper bound proposed by McKeown et al in 2019, when the mass ratio of a-MoS2 to MIP-202 was 5∶5 and the dual-functional filler content was 6%(mass). The separation performance of MMMs was not significantly degraded over 360 h testing, with an average CO2 permeability of 358 Barrer and CO2/N2 selectivity of 120.1. This is mainly due to the synergistic improvement of the gas separation performance of the membrane by a-MoS2 and MIP-202.

Key words: mixed matrix membranes, molybdenum disulfide, MIP-202, synergistic effect, CO2 separation

摘要:

为了获得高性能的CO2/N2分离膜,把空气中氧刻蚀的二硫化钼(a-MoS2)和金属有机框架材料MIP-202通过机械力化学反应制备的双功能填料作为分散相,聚醚嵌段酰胺(Pebax-1657)作为连续相,采用溶液浇铸法制备了Pebax/a-MoS2/MIP-202混合基质膜。采用FT-IR表征了填料的化学结构,借助ATR-FTIR、SEM、TG和力学性能测试表征了混合基质膜的化学结构、微观形貌结构、热稳定性和物理力学性能。研究了水含量、双功能填料配比、含量、膜两侧压差和操作温度对膜气体分离性能的影响,并考察了模拟烟道气(CO2/N2体积比15/85)条件下混合基质膜的长时间运行稳定性。结果表明:在温度为25℃、膜两侧压差为0.1 MPa的操作条件下,a-MoS2与MIP-202质量比为5∶5和双功能填料含量为6%(质量)时,膜的气体分离性能达到最优,CO2渗透性和CO2/N2选择性分别为380 Barrer和124.7,超过了2019年McKeown等提出的上限值。连续测试360 h后,混合基质膜的性能没有明显降低,其平均CO2渗透性和CO2/N2选择性分别为358 Barrer和120.1。这主要是由于a-MoS2和MIP-202协同提高了膜的气体分离性能。

关键词: 混合基质膜, 二硫化钼, MIP-202, 协同效应, CO2分离

CLC Number: