基于化学反应控制的CaSO4·2H2O-（NH4）2CO3反应动力学  

Reaction Kinetics of CaSO4·2H2O-（NH4）2CO3 Based on Chemical Reaction Control

作　　者：王茜[1] 朱家骅[1] 宫源 葛敬[1] 唐敏 Wang Qian;Zhu Jiahua;Gong Yuan;Ge Jing;Tang Min(School of Chemical Engineering , Sichuan University , Chengdu 610065 , Sichuan , China)

机构地区：[1]四川大学化学工程学院

出　　处：《四川化工》2019年第3期6-10,共5页Sichuan Chemical Industry

摘　　要：石膏矿化二氧化碳两步法的本质是CO2被氨吸收后形成的(NH4)2CO3与石膏主要成分CaSO4·2H2O间的固液反应。对该反应过程进行研究,探索其反应机理和反应动力学方程。当搅拌转速500 rpm,温度区间25~45℃,其反应动力学可由收缩未反应芯模型描述,且为化学反应控制。其动力学方程符合拟一级假设,在实验温度25、30、35、40和45℃时,求得反应速率常数分别为1.20×10^-4、1.72×10^-4、2.47×10^-4、3.26×10^-4和4.28×10^-4s^-1。进一步回归得相应温区内反应速率常数k与温度T的关系:k=76879.92×exp(-50.21×10^3R^-1T^-1)。The essence of the two-step method of gypsum mineralization is the solid-liquid reaction between (NH4)2CO3 formed after CO2 was absorbed by ammonia and CaSO4·2H2O,the main component of gyp-sum. The reaction process was studied, and the reaction mechanism and kinetic equation were explored. The stirring speed was 500 rpm and the temperature ranged from 25 to 45℃. The reaction kinetics of the reaction process could be described by the shrinking core model and controlled by the chemical reaction. Its dynamic equation coincided the pseudo-first order hypothesis. At experimental temperatures 25,30,35,40 and 45℃,the reaction rate constants were obtained as 1.20×10^-4,1.72×10^-4,2.47×10^4,3.26×10^-4 and 4.28×10^-4s^-1, respectively. In the corresponding temperature zone, the relation between reac- tion rate constant k and temperature T is obtained by regression:k=76879.92×exp(-50.21×10^3R^-1T^-1).

关 键 词：石膏 碳酸铵 反应动力学 速率常数 

分 类 号：O643.1[理学—物理化学]