Solid鈥揋as Carbonation Coupled with Solid Ionic Liquids for the Synthesis of CaCO3: Performance, Polymorphic Control, and Self-Catalytic Kinetics

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• 作者：Abdul-Rauf Ibrahim ; Yanan Gong ; Xiaohui Hu ; Yanzhen Hong ; Yuzhong Su ; Hongtao Wang ; Jun Li
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：July 17, 2013
• 年：2013
• 卷：52
• 期：28
• 页码：9515-9524
• 全文大小：610K
• 年卷期：v.52,no.28(July 17, 2013)
• ISSN：1520-5045

文摘

The effect of temperature, pressure, time, solid ionic liquid (SIL) mass (here, the SIL used is tetra-n-heptyl-ammonium bromide, abbreviated as THepAmBr), reuse of THepAmBr, type of SIL, and additives on the solid鈥揼as (Ca(OH)₂鈥揅O₂) carbonation system was investigated. Results showed that conversion increased as the temperature increased from 25.0 掳C up to 50.0 掳C and then decreased thereafter; but increased consistently with increasing pressure. Similarly, conversion increased as the mass of THepAmBr increased, leading to complete conversion at a THepAmBr/Ca(OH)₂ mass ratio of 0.1:1 with the production of rhombohedral calcites. Stability tests revealed that THepAmBr was active and stable. The effect of BmimBr and BmimCl indicated that they gave conversions of >96%. Furthermore, studies on polymorphic control to aragonite gave interesting results: 30.2% aragonite was synthesized with MgCl₂ and 54.7% with PEG6000. Moreover, time-dependent conversion showed that the reaction mechanism for the system was self-catalytic. Consequently, the reaction rate equation that was derived described the experimental conversion satisfactorily.