刘畅; 冯新; 吉晓燕; 陈栋梁; 魏涛; 陆小华
LIU Chang; FENG Xin; JI Xiaoyan; CHEN Dongliang; WEI Tao; LU Xiaohua
摘要: Dissolution kinetics of K2SO4 crystal in aqueous ethanol solutions was studied on-line with
ion selective electrode. The concentration of K2SO4 was calculated from the determined
electromotive force in which the activity coefficient of components in the liquid phase was
calculated with the Pitzer equation. Dissolution kinetic parameters in the modified
statistical rate theory were regressed. The correlation results show that dissolution rate
of K2SO4 is slower in aqueous ethanol solutions than that in aqueous solutions. The two
most important reasons are as follows:(1) The solubility of K2SO4 in aqueous ethanol
solutions is lower than that in aqueous solutions, which causes a decrease of the driving
force of mass transfer. (2) The process of surface reaction of K2SO4 became slower due to
the addition of ethanol, so that the whole process is mainly dominated by the surface
reaction instead of mass transfer.