文摘
The gas鈥搇iquid reactive crystallization process of CO2 gas and LiOH solution was systematically studied by a falling film column to prepare Li2CO3 crystals. Three important parameters concerning the fluid dynamic characteristics of the falling film column were obtained: the Reynolds number, the falling film thickness, and the exposure time. Li2CO3 is the intermediate product during the reactive absorption process, and the final pH of the solution should be controlled within the range of 9.0鈥?.5 to achieve high product yields. The effects of operating variables on the absorption rate, crystallization rate, and particle size distribution were experimentally explored and theoretically analyzed. Results showed that higher temperatures and LiOH concentrations significantly enhance reactants utilities. A novel method was adopted to quantitatively describe the interaction between absorption and crystallization, and results proved that the crystallization process promotes the transport of CO32鈥?/sup> ions from the interfacial liquid film to the bulk solution and, thus, facilitates the overall absorption process. Product characterizations were performed by SEM, XRD, and ICP-MS.