Choline chloride is one of the raw materials to produce high-pure cholineThe choline chloride solution contains many kinds of metal ions such as Na+

K+

Mg2+

Ca2+ and so onMetal ion has a bad influence on the quality of high-pure cholineWU64-H resin was used to eliminate the metal ions in choline chlorideThe effects of transformation agent

flow rate and concentration were investigatedExperimental result indicated that

the electron-grade tetramethylammonium hydroxide was the best transformation agent

the best flow rate was 5 times as bed volume rate in an hour and the optimal concentration was 2 mol·L-1Under these optimal conditions

the concentrations of metal ions were significantly decreasedCholine was prepared by electrolysisThe current density was 1000 A·m-2 and the temperature was 50℃After electrolysis

the contents of metal ions were below 100 μg·L-1

and came up to the requirements.