Synergistic Effect of Combining Titanosilicate and 1-Ethyl-3-Methylimidazolium Acetate in Mixed Matrix Membranes for Efficient C02 Separation

Abstract

The separation and capture of CO 2 from these sources is becoming important for greenhouse emission. The membrane-based separation process use to remove CO 2 takes advantages in energy efficient and environmentally friendly aspects and has been recognized as an important technology for CO 2 capture and gas separation. The novel mixed matrix membranes (MMMs) were fabricated by incorporating microporous titanosilicate ETS-10 and a highly CO 2 absorbent ionic liquid , [EMIM][Ac] into a Chitosan (CS) matrix to improve CO 2 separation performance, and were prepared, characterized and tested for CO 2 and N 2 . The solubility values show that the CO 2 solubility increases upon addition of ETS-10 particles. The N 2 solubility in the ETS-10/[EMIM][Ac]/CS was reduced, while CO 2 solubility remained constant. FT-IR spectra revealed a good interaction between the components in the MMMs. Subtle differences in the intensity and position of all individual bands, were observed in the region between 3600 and 2700 cm -1 and 1700 and 900 cm -1 . These indicated bonding of the components in the film, confirming the good interaction existing among the components, and that may account for the higher flexibility of the hybrid membrane materials imparted to both CS and ETS-10/CS MMMs, , due to the singular interaction between CS and [EMIM] [Ac].

Biopolymer-Based Mixed Matrix Membranes (MMMs) for CO2/CH4 Separation: Experimental and Modeling Evaluation

“…The intensity appears to be independent of the type of filler in the IL-CS matrix. The bands of the MMM layer do not shift from the IL-CS spectra, thus implying that the interaction between the filler and the continuous matrix is good and homogeneously dispersed as studied in previous works upon the self-standing films [63].…”

“…A sensitivity analysis to study the capacity of the synthesized membranes via the stagecut variable is presented below, at a fixed feed concentration of 65% of CH 4 , 35% of CO 2 , simulating the base raw biogas concentration without the trace components (hydrogen sulfide, water vapor, ammonia, and siloxane) that may be present depending on the types of feedstock and digestion process [63]. Different values of stage-cut, ranging from 0.1 to 0.9, were considered to calculate the evolution of purity and recovery of CH 4 in the retentate and CO 2 in the permeate, which are plotted in Figure 8.…”