摘要
The synthesis of calcium formate by Ca(OH)_2 carbonylation was studied in a semi-batch stirred tank.The reaction mechanism was analyzed theoretically and the rate of each step was compared.The influence ofreaction conditions on the formation of calcium formate was investigated.The results indicate that the rate-controlling step is the reaction between dissolved CO and dissolved Ca(OH)_2,and the gaseous diffusion resistance can be eliminated when the stirring speed reached 1000 r/min.Furthermore,the reaction kinetics was studied at a stirring speed of 1000 r/min,temperature of 423–453 K,pressure of 2.0–3.5 MPa and different initial concentrations of Ca(OH)_2.An effective method was proposed to measure the reaction rate of CO.A mathematical model was developed using the dual-film theory,and the parameters were obtained using regression of experimental data.The reaction rates calculated using the kinetics model were compared with experimental data.The results show that the deviations are within ±10%,proving that the established model is valid and can provide a basis for industrial amplification.
The synthesis of calcium formate by Ca(OH)_2 carbonylation was studied in a semi-batch stirred tank.The reaction mechanism was analyzed theoretically and the rate of each step was compared.The influence ofreaction conditions on the formation of calcium formate was investigated.The results indicate that the rate-controlling step is the reaction between dissolved CO and dissolved Ca(OH)_2,and the gaseous diffusion resistance can be eliminated when the stirring speed reached 1000 r/min.Furthermore,the reaction kinetics was studied at a stirring speed of 1000 r/min,temperature of 423–453 K,pressure of 2.0–3.5 MPa and different initial concentrations of Ca(OH)_2.An effective method was proposed to measure the reaction rate of CO.A mathematical model was developed using the dual-film theory,and the parameters were obtained using regression of experimental data.The reaction rates calculated using the kinetics model were compared with experimental data.The results show that the deviations are within ±10%,proving that the established model is valid and can provide a basis for industrial amplification.
基金
supported by the National High-Tech Research and Development Program of China ("863" Program, No.2012AA06A113)
