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目的研究LiOH.H2O水合结晶与CO2气体在密闭体系中的反应动力学规律。方法在反应温度为273~323K和CO2启动压力为40kPa~100kPa下,用Erofeev方程研究LiOH·H2O和CO2反应的动力学过程。结果随着CO2启动压力的降低,LiOH·H2O和CO2的反应速率缓慢下降。当反应温度低于299K时,LiOH·H2O的反应速率低且几乎不受反应温度的影响;当反应温度在300~323K时,LiOH·H2O水合结晶开始脱水,脱出的结晶水和反应生成水因蒸发而脱离固体反应物,温度越高,LiOH·H2O水合结晶脱水速率越高,LiOH·H2O和CO2的反应速率也就越大;当反应温度高于323K时,表现出无水LiOH晶体的反应动力学特征,可保持较高的反应速率。结论提高反应温度,LiOH·H2O和CO2的反应速率显著增大,反应动力学过程服从Erofeev模型。
Objective To study the reaction kinetics of LiOH.H2O hydrate crystallization and CO2 gas in a closed system. Methods The kinetics of the reaction between LiOH · H2O and CO2 were investigated by the Erofeev equation at reaction temperatures of 273 ~ 323 K and CO2 activation pressure of 40 kPa ~ 100 kPa. As a result, the reaction rate of LiOH · H2O and CO2 decreased slowly with the decrease of CO2 starting pressure. When the reaction temperature is lower than 299K, the reaction rate of LiOH · H2O is low and almost unaffected by the reaction temperature. When the reaction temperature is between 300 and 323K, the hydration crystallization of LiOH · H2O begins to dehydrate, The higher the temperature, the higher the rate of hydration crystallization of LiOH · H2O, the higher the reaction rate of LiOH · H2O and CO2; when the reaction temperature is higher than 323K, the reaction of anhydrous LiOH crystal appears Kinetic characteristics, can maintain a high reaction rate. Conclusion The reaction rate of LiOH · H2O and CO2 increases evidently with increasing the reaction temperature. The reaction kinetics obeys the Erofeev model.