Gas鈥揕iquid Reactive Crystallization of Lithium Carbonate by a Falling Film Column

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• 作者：Yu-Zhu Sun ; Xing-Fu Song ; Miao-Miao Jin ; Wang Jin ; Jian-Guo Yu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：December 11, 2013
• 年：2013
• 卷：52
• 期：49
• 页码：17598-17606
• 全文大小：557K
• 年卷期：v.52,no.49(December 11, 2013)
• ISSN：1520-5045

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 CO₃^{2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.}