发泡剂ADC生成过程动力学分析

Kinetic Analysis of the Azodicarbonamide Production Process in Gas-Liquid-Solid Systems

在玻璃搅拌反应器中进行了固体联二脲与氯气液相氧化反应生成发泡剂 ADC过程的传质与动力学实验, 提出了基于双膜理论的数学模型，以描述这一反应系统所涉及的气液和固液传质、固体溶解以及溶解物在液相中发生瞬间反应，特别是随反应进行固体反应物粒径变小导致固液传质速率减小的复杂过程. 模型能很好地描述实验结果. 依据模型估测的气液与固液传质系数值比较表明，气相反应物氯气的溶解传质过程是影响整个过程速率的主要控制步骤.

The oxidation of solid biurea with chlorine in aqueous solution to produce azodicarbonamide was experimentally studied in a 1 L agitated glass vessel with a four-blade paddle stirrer. Based on the film theory, a model is first developed for this system by taking the gas-liquid and solid-liquid mass transfer, solid dissolution, and instantaneous reaction between the dissolved reactants into consideration. The model can reasonably well represent the experimental data. According to the values of gas-liquid and solid-liquid mass transfer coefficients estimated with the proposed model, it is found that the gas-liquid mass transfer is a rate-controlling step in most cases, but the solid-liquid mass transfer becomes a rate-controlling step when the reaction is close to the end of this process.