摘要
在对碳酸化过程机理和碳化反应动力学进行深入分析和综合描述的基础上，将碳化塔考虑为一多相反应器和多级结晶器，建立了其数学模型。模型全面考虑了化学吸收、反应结晶、流动、传热、传质各物理—化学过程，能够预测和模拟工业碳化塔十几种操作变量对转化率、晶体粒径和产量的影响。通过模型模拟，考察了碳化塔反应器的整体行为，剖析了有关的工业碳酸化过程，提出了相应的工艺改进措施。
The mechanism and kinetics of the carbonation process of the ammoniacal brine were analysed in this paper. Chemical reactions involved in the carbonation process were considered as three consecutive and reversible steps: the first reaction between CO 2 and NH 3 is a fast one, which takes place within the liquid film, while the hydrolysis of NH 2COO - and precipitation of NaHCO 3 are slow reactions and taken place in the liquid bulk. Mathematical models for the reactions within the film and the bulk were proposed, respectively. Model simulations revealed that there are four resistances exisfed for CO 2 absorption: gas side mass transfer, liquid film, bulk hydrolysis and precipitation, and each of them can become rate determining step successively as carbonation degree increases from low level to high level.
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
1999年第4期350-356,共7页
Chemical Reaction Engineering and Technology
