Adsorption separation and its process simulation of trace Na+and K+in the preparation of electronic grade hydroxyethyl acrylate
Hydroxyethyl acrylate(HEA)is a widely used chemical raw material.With the development of science and technology,the purity requirements of electronic chemicals in the field of integrated circuit semiconductors have reached the electronic level.Therefore,the separation purification process is crucial.However,there is not much research reports about the separation purification of electronic grade HEA.In this work,the ion exchange resin adsorption method is used to remove Na+and K+while avoiding the problem of polymerization and reducing the purity of the product in the high-temperature environment of HEA.Na+and K+dynamic adsorption model and its characteristics were obtained through the static adsorption experiments of ion exchange resin.The fitting degrees of Langmuir isothermal adsorption model and Freundlich adsorption model were compared.The isothermal adsorption curves and maximum adsorption capacities for Na+and K+on the ion exchange resin were obtained.The penetration curves for Na+and K+on the ion exchange resin were acquired by the dynamic adsorption experiments.And the dynamic adsorption process was simulated using Aspen Adsorption.The relationship between the working state of resin bed and adsorption time was obtained.The experimental values were good agreements with model values.At the same time,the Langmuir model was better than the Freundlich model.The experimental results showed that the pseudo-first-order kinetic model could be better in line with the actual situation,and the adsorption rate of Na+was slightly faster than that of K+.The penetration curve was also consistent with characteristics of Na+that it had faster adsorption speed and penetration speed.The simulation results of Aspen Adsorption showed that the experimental values were consistent with the model values.The adsorption experimental results for industrial grade HEA showed that the removal rates of K+and Na+on the ion exchange resin were more than 99％.Therefore,the simulation and experimental results provided relative parameters data supports for the practical application of electronic grade HEA.
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