CO_2 Separation by Using a Three-stage Membrane Process

Bingcheng Liu ； Xuan Yang ； Ting Wang ； Mengmeng Zhang ； Pen-Chi Chiang

《Aerosol and Air Quality Research》 19卷12期 (2019/12) Pp. 2917-2928

https://doi.org/10.4209/aaqr.2019.10.0519

摘要

This work proposed and optimized a three-stage membrane process for CO_2 separation. The results of this study revealed that the membrane technology is a suitable process for the CO_2 separation in a higher concentration. In addition, the MATLAB was used to simulate and obtain the optimal operational parameters for a three-stage membrane process. This work established a partial cycle and recovered the CO_2 from the permeation side of second-stage membrane that enhance a higher purity CO_2 gas stream. The results of this study indicated that when the CO_2 concentration was higher than 50% and at a flow rate of 100000 Nm^3 d^(-1), the CO_2 separation could be achieved at the optimal operation condition. Under the conditions that the membrane areas were 2400, 3800, and 1800 m^2 for the first-, second-, and third-stage membrane, respectively and the operational pressure at first- and third stage membrane were 3.0 and 2.5 MPa, respectively, the CO_2 separation fraction was higher than 90% and CH_4 loss rate was lower than 5%. The results of this study have a high potential for the practical application.

關鍵字

Optimal design ； CO_2-EOR extraction gas ； CO_2 capture ； Multi-stage membrane separator