糖蜜酒精废液脱钾树脂的解吸动力学

【目的】研究糖蜜酒精废液脱钾树脂BK-001中K~+的静态解吸过程。【方法】考察洗脱剂温度、浓度及树脂粒径对K~+解吸过程的影响,用动边界模型描述K~+的解吸过程。【结果】确定糖蜜酒精废液脱钾树脂BK-001中K~+的解吸过程为颗粒扩散控制,该反应的表观活化能为40.9kJ/mol,反应级数为1.19,表观频率因子为5.27×10~4 min~(-1),假二级动力学模型更适合描述K~+的解吸过程(R~20.995)。K+解析过程的总动力学方程式为1-3(1-F)~(2/3)+2(1-F)=5.27×104r20H2SO4]~(1.19)e_((-4.09×10~4))/RT。【结论】脱钾树脂BK-001的解吸动力学方程为糖蜜酒精废液脱钾树脂的再生及钾盐资源的综合利用提供理论依据。

Desorption Kinetics of Potassium on Resin BK-001 Having Adsorbed Potassium from Vinass

Objective] Desorption kinetics of potassium on Resin BK-001 were studied after having adsorbed potassium from vinasses.Methods] The influences of eluent temperature, eluent concentration and resin size on K⁺ desorption process were estimated.In addition, a moving boundary model was used to describe the desorption kinetics of K⁺ on Resin BK-001.Results] Potassium-desorbing process was controlled by ion diffusion, in which the activation energy was 40.9kJ/mol, the reaction order was 1.19 and the apparent frequency factor was 5.27×10⁴min^-1.The desorption kinetics complied with pseudo-second-order kinetic model (R²>0.995).Total kinetic equation of the potassium-desorbing process is 1-3 (1-F)^2/3+2 (1-F)=5.27×10⁴r₀²H₂SO₄]^1.19e ^{(-4.09×104)/RT}.Conclusion] This research laid a theory foundation for the regeneration of Resin BK-001 used for separating potassium from molasses vinasse and the comprehensive utilization of potassium resource.