化工进展 ›› 2022, Vol. 41 ›› Issue (3): 1283-1288.DOI: 10.16085/j.issn.1000-6613.2021-1843

• 二氧化碳的捕集、封存及利用 • 上一篇    下一篇

基于NaOH溶液CO2膜吸收系统的膜结构及传质性能

冯燕(), 李娜(), 杜南, 李小倩, 周屈兰   

  1. 西安交通大学动力工程多相流国家重点实验室,陕西 西安 710049
  • 收稿日期:2021-08-25 修回日期:2021-11-26 出版日期:2022-03-23 发布日期:2022-03-28
  • 通讯作者: 李娜
  • 作者简介:冯燕(1995—),女,硕士研究生,研究方向为污染物处理。E-mail:410589918@qq.com
  • 基金资助:
    陕西省科技计划(2020JM-081);国家自然科学基金(51076127)

Structure and mass transfer characteristics of membrane system for absorption of CO2 in NaOH solution

FENG Yan(), LI Na(), DU Nan, LI Xiaoqian, ZHOU Qulan   

  1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049,Shaanxi, China
  • Received:2021-08-25 Revised:2021-11-26 Online:2022-03-23 Published:2022-03-28
  • Contact: LI Na

摘要:

碳捕集与利用技术是实现减碳目标的有效方案。膜系统气体吸收技术能够实现CO2HCO3-CO32-形式存储在无机碱性吸收剂中,并还原成甲醇、乙醇等清洁燃料。本文采用膜单侧浸泡实验法和传质实验,分别考察了疏水性微孔滤膜聚四氟乙烯(PTFE)膜、聚偏氟乙烯(PVDF)膜、聚丙烯(PP)膜在NaOH碱性溶液中的结构和CO2传质特性的变化。结果表明,PTFE膜和PP膜在NaOH碱性溶液中溶胀率上升,孔径减小,孔隙率下降,疏水性下降,传质系数下降;PVDF膜在NaOH溶液中会发生反应,结构被破坏,传质系数接近无膜吸收,但无法起到相界面的作用,不能直接用于以NaOH为吸收剂的膜吸收系统。

关键词: 二氧化碳吸收膜, 氢氧化钠溶液, 疏水性, 传质特性

Abstract:

Carbon capture and utilization is an effective way to achieve the carbon reduction target. Gas absorption by alkaline solution on membrane can store CO2 in the form of HCO3- and CO32-, and the solution can be further used to convert the absorbed CO2 into clean fuels. The structure and mass transfer characteristics of PTFE, PVDF, PP membranes in the membrane absorption of CO2 by NaOH solution were investigated by single-sided membrane immersion and mass transfer experiments. The results showed that the swelling rates of PTFE and PP membranes in NaOH solution increased, and their pore size, porosity, hydrophobicity and mass transfer coefficient decreased. The mass transfer coefficient of PVDF membrane system was close to that of absorption without membrane, which could be attributed to the reaction between the membrane and NaOH solution, causing the structure damage and inability to function as the phase-interface.

Key words: CO2 absorption membrane, NaOH solution, hydrophobicity, mass transfer characteristics

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