Study on deactivation mechanism and regeneration method of deactivated resin in hydrogen peroxide adsorption purification process
In addressing the frequent need for resin replacement due to incomplete regeneration in existing hydrogen peroxide(H2O2)production technology,this study analyzed organic impurities in LSA-5B resin before and after H2O2 adsorption,along with those impurities not fully desorbed from resin.Characterization was conducted using high-resolution liquid chromatography-mass spectrometry,thermogravimetric analysis,Fourier transform infrared spectroscopy,and X-ray photoelectron spectroscopy.Various regenerants were employed to regenerate the inactivated resin,with FT-IR result revealing the complete characteristic peak disappearance of 2-methylcyclohexyl acetate in the NaOH-treated deactivated resin.Consequently,NaOH solutions of various concentrations were tested to optimize the regeneration conditions for the inactivated resin.The results of the N2 adsorption-desorption test showed that the specific surface area of the resin was recovered to 575 m2/g using 0.25 mol/L NaOH,which was higher than 412 m2/g observed from the resin regenerated with methanol,demonstrating a superior regeneration efficacy compared to methanol regeneration.
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维普
