Mass Transfer Analysis of CO2 Capture by PVDF Membrane Contactor and Ionic Liquid. Issue 4 (15th March 2017)

• Record Type: Journal Article
• Authors: Gómez-Coma, Lucia; Garea, Aurora; Irabien, Angel
• Is Part Of: Chemical engineering & technology. Volume 40:Issue 4(2017)
• Page Start: 678
• Page End: 690
• Publication Date: 2017-03-15
• Subjects: CO2 capture -- Ionic liquids -- Mass transfer coefficient -- Membrane contactors -- Poly(vinylidene fluoride); Chemical engineering -- Periodicals; Chemical processes -- Periodicals; 660.05
• DOI: 10.1002/ceat.201600293
• Languages: English
• ISSNs: 0930-7516

Abstract

Abstract: Post‐combustion processes based on ionic liquids (ILs) and membrane contactors are attractive alternatives to traditional systems. Here, a gas stream composed of 15 % CO2 and 85 % N2 flowed through the lumen side of a hollow‐fiber membrane contactor containing poly(vinylidene fluoride)‐IL (PVDF‐IL) fibers. The IL 1‐ethyl‐3‐methylimidazolium acetate [emim][Ac] served as an absorbent due to its high chemical absorption and CO2 solubility. The overall mass transfer coefficient ( K overall ), activation energy ( E a ), and resistances of the hollow‐fiber membrane were quantified. The K overall value was one order of magnitude higher than those reported in previous works with conventional solvents, and the E a was lower than formerly stated values for other solvents. A theoretical simulation was conducted to estimate the operational parameters required for 90 % CO2 capture and to quantify intensification effects related to CO2 absorption in a packed column. Abstract : Compared to traditional systems, post‐combustion processes based on ionic liquids and membrane contactors are promising alternatives. A novel technique using a poly(vinylidene fluoride) hollow‐fiber membrane contactor and the ionic liquid [emim][Ac] as absorbent is proposed. Competitive results to traditional absorption towers could be achieved. A theoretical simulation provides the basis for scaling.