ELECTRODIALYSIS SYSTEM AND CO2 RECOVERY SYSTEM

• Main Authors: MURAMATSU TAKEHIKO, MURAOKA DAIGO, HANDA YUSUKE, MURAI SHINJI, FUJITA KISHITO, MORIGAKI HAYATO
• Format: Patent
• Language: English; Japanese
• Published: 22.09.2023
• Subjects: PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

To provide an electrodialysis system and a CO2 recovery system which reduce amine loss by electrodialysis, and increase an impurity removal amount and thereby maintain CO2 absorption efficiency of an absorbent.SOLUTION: An electrodialysis system is provided on a CO2 recovery system having an absorption part 10 for making absorbent containing an amine-based compound absorb at least a part of CO2 in a treated gas containing the CO2, and a regeneration part 12 for emitting the CO2 from the absorbent absorbing the CO2 in the absorption part, and includes a primary treatment unit 13 for performing electrodialysis between a treated absorbent 43B as at least a part of the absorbent emitting the CO2 in the regeneration part, and a first concentrated liquid, and discharging the treated absorption liquid as a primary treatment absorption liquid 43C subjected to the electrodialysis, and a secondary treatment unit 14A for subjecting the primary treatment absorption liquid discharged from the primary treatment unit to electrodialysis.SELECTED DRAWING: Figure 1 【課題】電気透析によるアミン損失を低減し、不純物除去量を増大させることで吸収液のＣＯ２吸収効率を維持する電気透析システムおよびＣＯ２回収システムを提供することである。【解決手段】実施形態の電気透析システムは、ＣＯ２を含む被処理ガス中の少なくとも一部の前記ＣＯ２を、アミン系化合物を含む吸収液に吸収させる吸収１部１０と、前記吸収部で前記ＣＯ２を吸収した吸収液から前記ＣＯ２を放出させる再生部１２と、を有するＣＯ２回収システムが備える電気透析システムであって、前記再生部でＣＯ２を放出した吸収液の少なくとも一部である被処理吸収液４３Ｂと、第一濃縮液との間で電気透析し、前記被処理吸収液を電気透析された一次処理吸収液４３Ｃとして排出する一次処理ユニット１３と、前記一次処理ユニットから排出される前記一次処理吸収液を電気透析する二次処理ユニット１４Ａと、を備える。【選択図】図１