非室温离子液体辅助的高压快速碳化反应及体系的相平衡、扩散和结晶行为

针对工业碳酸钙生产的碳化反应体系中存在的相平衡、传质及晶型的限制，也针对二氧化碳的固定和资源化，本项目提出研究非室温离子液体(NRTIL)辅助的高压(尤指超临界)二氧化碳与氢氧化钙快速碳化反应制备纳米碳酸钙。建立高压石英弹簧法装置和方法，研究体系的相平衡和扩散行为。建立高压反应装置、在线原位红外方法研究碳化反应，获取各种条件对反应速率、转化率及产物晶型、粒径等的影响规律,探究反应机理。应用高压偏光显微装置，结合XRD分析和晶型控制剂，研究产物晶体的成核、生长速率和晶型。结合平衡、扩散、反应速率和结晶动力学的研究，建立过程的反应结晶方程用于优化产品。将超临界流体和离子液体（尤指NRTIL）两种绿色化工手段耦合来突破传统体系的相平衡和传质制约，可望提供一种快速制备碳酸钙、晶型可控，及供其它类似反应研究的新平台，也为二氧化碳的固定和资源化提供新思路，因此开展本项目研究具有经济和社会双重意义。

With respect to the phase equilibrium and mass transfer limitations of the traditional industrial carbonation process for producing calcium carbonate, also to the fixation and resource utilization of carbon dioxide, the project proposes and will explore a new carbonation approach for rapid production of nanoparticles of calcium carbonate by using high pressure (particularly, supercritical) carbon dioxide coupled with non-room temperature ionic liquids (NRTIL). In line with the purposes, the project will establish a high pressure spring quartz method to study the phase equilibrium and diffusion behaviors of the concerned systems; it will then set up a high pressure reactor, a high pressure in-situ IR apparatus to study the reaction rate, conversion of the reactants, sizes and crystal morphologies under various conditions; finally, XRD and a high pressure polar light microscopy established will be applied for studying crystallization kinetics and crystal morphologies with or without crystal control agents; with the phase equilibrium, diffusion, reaction rate and crystallization kinetics, an integrated reaction-crystallization equation will be established for guiding the production of desirable products. In order to solve the problems existed in the traditional technology, the proposed method of the project by combining the two green chemistry solvents: supercritical fluid and NRTIL will hopefully provide a potential technique for rapid production of particle-tunable calcium carbonate and a new platform for other similar reaction systems, and will also provide new idea for the fixation and resource utilization of carbon dioxide. Therefore, the proposed project is of economic and social significance