title: A composite reactor with wetted-wall column for mineral carbonation study in three-phase systems.
abstract: Despite the availability of various reactors designed to study gas-liquid reactions, no appropriate devices are available to accurately investigate triple-phased mineral carbonation reactions involving CO2gas, aqueous solutions (containing divalent cations), and carbonate minerals. This report presents a composite reactor that combines a modified conventional wetted-wall column, a pH control module, and an attachment to monitor precipitation reactions. Our test and calibration experiments show that the absorption column behaved largely in agreement with theoretical predictions and previous observations. Experimental confirmation of CO2absorption in NaOH and ethanolamine supported the effectiveness of the column for gas-liquid interaction. A test run in the CO2-NH3-MgCl2system carried out for real time investigation of the relevant carbonation reactions shows that the reactor's performance closely followed the expected reaction path reflected in pH change, the occurrence of precipitation, and the rate of NH3addition, indicating the appropriateness of the composite device in studying triple-phase carbonation process.
authors.affiliation: School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, People's Republic of China.
authors.forename: Chen
authors.initials: C
authors.lastname: Zhu
authors.affiliation: School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, People's Republic of China.
authors.forename: Xizhi
authors.initials: X
authors.lastname: Yao
authors.affiliation: School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, People's Republic of China.
authors.forename: Liang
authors.initials: L
authors.lastname: Zhao
authors.affiliation: School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, People's Republic of China.
authors.forename: H Henry
authors.initials: HH
authors.lastname: Teng