离子交换树脂法吸附醋酸工艺

采用离子交换树脂法吸附醋酸溶液,并对该过程进行系统的研究. 通过树脂选型确定大孔弱碱性阴离子交换树脂D311,其对醋酸吸附容量较大,且膨胀收缩率较小. 用D311树脂对醋酸含量为1.5%(w)的醋酸溶液进行了吸附和脱附工艺优化研究,考察了体系温度、进料流量等对吸附和脱附过程的影响,在优化条件为温度30.0℃、进料流量4.0 mL/min时,吸附率达93.97%;温度50.0℃、洗脱剂3.98 mol/L NaOH、流量1.0 mL/min时,脱附率达100%. 树脂再生循环结果表明,D311重现性及机械强度较好.

Recovery of Acetic Acid with Ion Exchange Resins

Using ion exchange resins to recover acetic acid, the adsorption process was studied systematically. Through the resin selection experiments, D311 resin showed a better capacity and smaller constriction. The adsorption and desorption process of dilute acetic acid were studied with the selected D311 resin, and the optimized operation conditions were obtained. When the temperature was 30.0℃ and the feed velocity 4.0 mL/min, the adsorption rate reached 93.97%. When the temperature was 50.0℃, and the concentration of NaOH 3.98 mol/L, velocity 1.0 mL/min, the desorption rate reached 100%. Moreover, the resin regenerative experiments indicated that D311 resin regeneration had good repetition and excellent mechanical strength.