金属醇盐法制备5N级氧化铝水解工艺过程中的关键科学问题研究

This project intends to solve the two key science problems during the production of 5N grade alumina by alkoxide method. The two science problems are hydrolysis and condensation kinetic of aluminum alkoxide and the relationship of azeotropic temperature and composition of isopropyl alcohol - water system under the condition of vaccum distillation...Alkoxide hydrolysis kinetics model will be established based on the theory of coordination chemistry, reaction kinetics, etc. Variation of functional groups with the reaction time in the alkoxide hydrolysis process can be obtained by computer simulation.The results will provide theoretical evidence for anhydrous alcohol recovery and the structure of the products. The variation of azeotropic temperature via composition of isopropyl alcohol - water system under the condition of vacuum distillation will be investigated by gas-liquid equilibrium equation and UNIFAC group contribution method. The hydrolysis drying time will be shortened by controlling the water content in aqueous alcohol. A hydrolysis processing database and the quantitative relationship of the recovery rate of anhydrous alcohol to water content in aqueous alcohol, addition of aqueous alcohol, and water content in hydrolysis product will be established through theoretical calculation. ..Theoretical research results can adjust on the the actual hydrolysis process. Recycling of anhydrous alcohol will be realized by two-step hydrolysis process, and the efficiency of recycling rate will be targeted up to 80%. The hydrolysis drying time will be shortened less than 8 hours.

本项目拟解决醇盐法5N级氧化铝水解过程中的两个关键科学问题- - 铝醇盐水解缩聚动力学及减压条件下异丙醇-水共沸点温度、组成与压力关系。.利用配位化学、反应动力学等理论建立醇盐水解过程动力学模型，通过计算机模拟获得醇盐水解中各反应官能团随反应时间的变化规律，为无水醇回收及反应产物结构确定建立理论依据；建立气液平衡方程，通过UNIFAC基团贡献法研究异丙醇-水在减压蒸馏条件下共沸点温度与组成变化规律，通过控制含水醇水含量，缩短水解干燥时间；利用对醇盐水解过程关键科学问题的研究结果，通过理论计算获得水解过程数据库，建立无水醇回收率、有水醇加入量、水加入量、水解产物水含量间的定量关系。.通过理论研究对实际水解生产工艺进行调整，采用两步水解工艺实现无水醇回收率超过80%，水解干燥时间缩短至8小时以内的目标。

本项目解决了醇盐法5N级氧化铝水解过程中的两个关键科学问题——铝醇盐水解缩聚动力学及减压条件下异丙醇-水共沸点温度、组成与压力关系。.利用配位化学、反应动力学等理论建立了醇盐水解过程动力学模型，通过计算机模拟获得了醇盐水解中各反应官能团随反应时间的变化规律，为无水醇回收及反应产物结构确定建立了理论依据；建立了气液平衡方程，通过UNIFAC基团贡献法研究了异丙醇-水在减压蒸馏条件下共沸点温度与组成变化规律，通过控制含水醇水含量，缩短水解干燥时间；利用对醇盐水解过程关键科学问题的研究结果，通过理论计算获得了水解过程数据库，建立无水醇回收率、有水醇加入量、水加入量、水解产物水含量间的定量关系。. 系统研究了水热温度及煅烧温度对产物相结构及微观形貌的影响。结果表明，水热处理提高了产物晶体结构的对称性，使其非对称伸缩受到限制，而对称性伸缩得到增强。水热处理也影响煅烧产物的热稳定，随水热处理温度提高，α－Al2O3出现的温度提高，表明煅烧过程中中间相的热稳定性得到提高，同时α－Al2O3出现是在θ－Al2O3相晶格中发生层错产生的。. 通过理论研究对实际水解生产工艺进行了调整，采用两步水解工艺实现了无水醇回收率超过80%，水解干燥时间缩短至8小时以内的目标。