Reaction Kinetics of LiOH Improved with Composite Silica Gel of Lanthanum Chloride for Absorbing CO2
来源期刊：JOURNAL OF RARE EARTHS2007年增刊第1期
论文作者：Zhao Zhuo Fu Pingfeng Wang Jingxin
Key words：lanthanum chloride; anhydrous lithium hydroxide; carbon dioxide; kinetics;
Abstract: A static method was employed to study the reaction kinetics of anhydrous lithium hydroxide (LiOH) and CO2. The reaction generated water was absorbed with the composite silica gel of lanthanum chloride to make the experiment repeatable. At the reaction temperature of 15~60℃ and initial CO2 pressures of 25~100kPa, the reaction rate of anhydrous LiOH and CO2 decreased slightly with the reduction of initial CO2 pressure and the rise of reaction temperature, indicating that the reaction activation energy of LiOH and CO2 was negative and close to zero. During the middle period (1~5 min) of the isothermal reaction, the ratio of reaction efficiency was approximately the power of 0.4 to that of initial CO2 pressures. As anhydrous LiOH reacted to CO2, the solid product Li2CO3 covered on the surface of LiOH was not compact, so it did not hinder the subsequent reaction of absorbing the CO2 gas. The reaction kinetics of anhydrous LiOH and CO2 obeyed the Erofeev's model.
Zhao Zhuo1，Fu Pingfeng2，Wang Jingxin3
(1.Department of Environmental Science, College of Arts & Science of Beijing Union University, Beijing 100083, China;
2.Research Institute of Indoor Environment, Beijing Union University, Beijng 100083, China;
3.Research Institute of Science and Technology Information, Beijing General Institute for Nonferrous Metals, Beijing 100088, China)
Abstract:A static method was employed to study the reaction kinetics of anhydrous lithium hydroxide (LiOH) and CO2. The reaction generated water was absorbed with the composite silica gel of lanthanum chloride to make the experiment repeatable. At the reaction temperature of 15~60℃ and initial CO2 pressures of 25~100kPa, the reaction rate of anhydrous LiOH and CO2 decreased slightly with the reduction of initial CO2 pressure and the rise of reaction temperature, indicating that the reaction activation energy of LiOH and CO2 was negative and close to zero. During the middle period (1~5 min) of the isothermal reaction, the ratio of reaction efficiency was approximately the power of 0.4 to that of initial CO2 pressures. As anhydrous LiOH reacted to CO2, the solid product Li2CO3 covered on the surface of LiOH was not compact, so it did not hinder the subsequent reaction of absorbing the CO2 gas. The reaction kinetics of anhydrous LiOH and CO2 obeyed the Erofeev''s model.
Key words:lanthanum chloride; anhydrous lithium hydroxide; carbon dioxide; kinetics;
【全文内容正在添加中】
