Adsorption Separation and Simulation of Trace Metal Ions in Electronic Grade Isopropanol
This paper studies the removal of trace metal ions in isopropanol.Sodium-type ion-exchange resin used in the industry is subjected sequentially to acid,alkali and then acid treatment for hydrogenation.Then,the isothermal and kinetic adsorption of Na+and K+by the resin in isopropanol was studied by static adsorption experiments.The isothermal adsorption obtained by origin fitting conforms to the langmuir isothermal adsorption model,and the kinetics adsorption conforms to the pseudo-first-order kinetic model.The maximum adsorption capacities of Na+and K+in isopropanol were calculated to be 4.28 mg/g and 3.36 mg/g,respectively.The breakthrough curves of Na+and K+were obtained by dynamic experiments.The adsorption process was simulated,and an adsorption physical model ignoring pressure drop and temperature change was established.The dynamic adsorption process of Na+and K+in isopropanol was simulated by Aspen Adsorption,and the simulation results were in good agreement with the experimental breakthrough curves.Using the ion-exchange resin,the content of metal ions in isopropanol was detetmined to be less than 5.00 μg/L.These results provide a basis for the design of adsorption materials and devices for trace metal ions in isopropanol.In addition,a method of slowly digesting the resin with nitric acid and hydrogen peroxide in a heated environment was proposed.This method can detect the content of metal ions in the resin,and the error between the detection result and the actual value is within 10%.
万方数据
维普
