Exchange rates of calcium ion with high aluminum zeolites used in detergent, such as NaA, MAP and MAX zeolites, were measured by using a improved calcium ion selective electrode method (ISE). The calcium exchange kine...Exchange rates of calcium ion with high aluminum zeolites used in detergent, such as NaA, MAP and MAX zeolites, were measured by using a improved calcium ion selective electrode method (ISE). The calcium exchange kinetics of zeolites was studies by using Body Reichenberg diffusion equation. The effects of the particle size, pore structure of zeolites and the ion exchange temperature on the calcium ion exchange kinetics were also investigated. Results showed that the diffusion coefficients at room temperature were 2.33×10-15m2·s-1, 4.28×10-16m2· s-1 and 7.73×10-17m2·s-1 for zeolite MAX, NaA and MAP, respectively. The activation energy of diffusion was 48kJ·mol-1, 65kJ·mol-1 and 91kJ·mol-1 for zeolite MAX, NaA and MAP, respectively.展开更多
In this paper, a macrokinetics model equation describing the characterislicsof the solid--liquid mass transfer has been proposed.Tile quailtative analysis and experimental verification have been done for this model eq...In this paper, a macrokinetics model equation describing the characterislicsof the solid--liquid mass transfer has been proposed.Tile quailtative analysis and experimental verification have been done for this model equation. The model equation can explain the ion exchange process considerably well.展开更多
A new ion exchange kinetics equation including resin phase saturation factor is presented in this paper. The equation is characterized by the apparent reaction order and apparent saturation order.
文摘Exchange rates of calcium ion with high aluminum zeolites used in detergent, such as NaA, MAP and MAX zeolites, were measured by using a improved calcium ion selective electrode method (ISE). The calcium exchange kinetics of zeolites was studies by using Body Reichenberg diffusion equation. The effects of the particle size, pore structure of zeolites and the ion exchange temperature on the calcium ion exchange kinetics were also investigated. Results showed that the diffusion coefficients at room temperature were 2.33×10-15m2·s-1, 4.28×10-16m2· s-1 and 7.73×10-17m2·s-1 for zeolite MAX, NaA and MAP, respectively. The activation energy of diffusion was 48kJ·mol-1, 65kJ·mol-1 and 91kJ·mol-1 for zeolite MAX, NaA and MAP, respectively.
文摘In this paper, a macrokinetics model equation describing the characterislicsof the solid--liquid mass transfer has been proposed.Tile quailtative analysis and experimental verification have been done for this model equation. The model equation can explain the ion exchange process considerably well.
基金The project supported by National Natural Science Foundation of China
文摘A new ion exchange kinetics equation including resin phase saturation factor is presented in this paper. The equation is characterized by the apparent reaction order and apparent saturation order.
