A coupling process of electrodialysis with oxime hydrolysis reaction for preparation of hydroxylamine sulfate

Abstract

A coupling process of electrodialysis with oxime hydrolysis reaction for preparing hydroxylamine sulfate was developed in this work. The three steps, including the oxime hydrolysis, the hydroxylamine protonation reaction, and the separation process, are integrated into a triple-chamber electrodialysis stack. In this novel method, the impacts of current density, oxime concentration, and reaction time were investigated. The results indicated that the decomposition voltage is above 1.93 V. Furthermore, the current density is 4.69 × 10⁻² A cm⁻², the oxime concentration is 1.00 mol L⁻¹, and when reaction time reaches 600 min, the yield of hydroxylamine sulfate is 67.59%. Moreover, the process has excellent mass transfer performance, mild reaction conditions, and simple operation compared with conventional methods. This work will provide a theoretical basis for the green and continuous manufacture of hydroxylamine sulfate and a guide for preparing other hydroxylamine salts through such hydrolysis methods.