Abstract: CDAH2 resin was synthesized from catechol and chloroacetic acid as the main starting materials，its enrichment behavior for potassium ion was evaluated with a self-made exchange resin column. The improved synthesis process provides the resin with good adsorption ability for potassium ion in the exchange test solution with pH=4.0 at a temperature below 20 ℃ and an exchange flow rate of 2mL/min. The CDAH2 resin has a high recycling rate，and can be easily regenerated.

摘要： 以邻苯二酚和氯乙酸为主要原料合成了CDAH2树脂，并研究了自制的的树脂交换分离柱对钾离子的富集效果。实验结果表明：该合成方法较大程度地优化了合成工艺，利用CDAH2树脂自制成的交换分离柱，在交换试液pH值为4.0、温度为20 ℃以下，交换流速为2 mL/min时，树脂对钾离子的吸附性能良好，循环使用率高，树脂再生活化处理容易。