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当前位置: 首页 > 文章 > 温度对CO2(g)-NH3(aq)-Ca2+(aq)气液两相体系中结晶反应动力学模型的影响 磷肥与复肥 2019 (6) 9-13,23
Position: Home > Articles > 温度对CO2(g)-NH3(aq)-Ca2+(aq)气液两相体系中结晶反应动力学模型的影响 Phosphate & Compound Fertilizer 2019 (6) 9-13,23

温度对CO2(g)-NH3(aq)-Ca2+(aq)气液两相体系中结晶反应动力学模型的影响

作  者：
范晓宇;葛敬;朱家骅;宫源;彭玉凤;谢安帝;卢蔚;王茜
单  位：
四川大学化学工程学院
关键词：
气液两相;碳酸钙;结晶反应;动力学模型
摘  要：
在搅拌转速600 r/min、CO2流量245 mL/min、Ca2+初始浓度0.24 mol/L的条件下研究296.15~323.15 K时CO2(g)-NH3(aq)-Ca2+(aq)气液反应体系中碳酸钙结晶反应动力学模型.结果表明:当温度<313.15 K时,反应体系中水合氨解离及CO2吸收化学反应达到或接近平衡,依据反应动力学模型,拟合得到296.15、303.15 K下CO2(g)-NH3(aq)-Ca2+(aq)气液两相结晶反应的反应速率常数在数值上分别为1.377、4.894,反应级数为2.769;当温度≥313.15 K时,反应体系中水合氨解离及CO2吸收化学反应未能达到或接近平衡,依据简化的反应动力学模型,拟合得到313.15、323.15K下CO2(g)-NH3(aq)-Ca2+(aq)气液两相结晶反应的反应速率常数在数值上分别为0.100、0.159,反应级数为1.097.研究结果对CO2(g)-NH3(aq)-Ca2+(aq)气液两相结晶反应动力学模型受温度的影响提供了动力学参数,对工业设计具有一定指导意义.
作  者：
FAN Xiaoyu;GE Jing;ZHU Jiahua;GONG Yuan;PENG Yufeng;XIE ANDi;LU Wei;WANG Qian;School of Chemical Engineering, Sichuan University;
单  位：
FAN Xiaoyu%GE Jing%ZHU Jiahua%GONG Yuan%PENG Yufeng%XIE ANDi%LU Wei%WANG Qian%School of Chemical Engineering, Sichuan University
关键词：
gas-liquid two-phase;;calcium carbonate;;crystallization reaction;;kinetic model
摘  要：
The kinetic model of crystallization reaction in CO_2(g)-NH_3(aq)-Ca~(2+)(aq) gas-liquid system(296.15-323.15 K)is studied under the conditions that stirring speed is 600 r/min, the CO_2 flow is 245 mL/min,and the initial concentration of Ca~(2+) is 0.24 mol/L.The results prove that when the temperature is less than 313.15 K,the hydrated ammonia dissociation and the chemical reaction in the CO_2 absorption process reaches or approaches equilibrium, according to the reaction kinetic model, the numerical value of reaction rate constants of CO_2(g)-NH_3(aq)-Ca~(2+)(aq) gas-liquid two-phase crystallization reactions at 296.15 K and 303.15 K are respectively 1.377 and 4.894, and the reaction order is 2.769; When the temperature is greater than or equal to313.15 K, the hydrated ammonia dissociation and the chemical reaction in the CO_2 absorption process cannot approach equilibrium, according to the simplified reaction kinetic model, the numerical value of reaction rate constants are respectively 0.100 and 0.159 at 313.15 K and 323.15 K, meanwhile, the reaction order is 1.097.The results provide the kinetic parameter for the effects of temperature on kinetic model of gas-liquid two-phase crystallization. It is helpful for industrial design.

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