Potential of Osmotic Membrane Crystallization Using Dense Membranes for Na2CO3 Production in a CO2 Capture Scenario

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• 作者：Wenyuan Ye ; Jianhui Wu ; Fan Ye ; Huiming Zeng ; Anh T. K. Tran ; Jiuyang Lin ; Patricia Luis ; Bart Van der Bruggen
• 刊名：Crystal Growth & Design
• 出版年：2015
• 出版时间：February 4, 2015
• 年：2015
• 卷：15
• 期：2
• 页码：695-705
• 全文大小：826K
• ISSN：1528-7505

文摘

The potential of a membrane crystallizer equipped with a BW-30 reverse osmosis membrane has been investigated for recovering Na₂CO₃ from aqueous streams, targeting its application in CO₂ mitigation. The effect of various crystallization conditions, such as the concentration of the osmotic solution, the concentration of the Na₂CO₃ solution, as well as membrane orientations on the process performance has been systematically determined. This dense membrane crystallizer was thought to be better than the membrane contactor applied in previous work due to its higher water flux, marked as 0.210 L路m^鈥?路h^鈥? in forward osmosis (FO) mode and 0.164 L路m^鈥?路h^鈥? in pressure retard osmosis (PRO) mode compared with 0.08 L路m^鈥?路h^鈥? for the membrane contactor. Compared with the PRO mode, the FO mode was found to be a better alternative with higher water permeability and draw solute rejection. The concentration of the osmotic solution was the key parameter to condition the applicability of this system. The long-term operation of the system can be realized without any membrane damage and fouling. In addition, Na₂CO₃路10H₂O crystals were obtained with a superhigh purity of 99.98%. Therefore, this osmotic crystallizer equipped with a dense membrane was proven to be an effective alternative for Na₂CO₃ crystallization for the application in CO₂ capture process.