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采用强碱性阴离子交换树脂开展醇胺溶液中Cl~-的吸附脱除效果评价。结果表明,SA17阴离子交换树脂具有对Cl~-的吸附能力强、工作交换容量大和交换速度快的优点,是适宜的脱Cl~-吸附剂。空速υ=10h~(-1)时,前60min内,SA17树脂对溶液中Cl~-的脱除率高达99%,吸附穿透曲线符合Thomas模型;吸附等温线Freundlich模型能较好反映SA17树脂的吸附行为,速率控制步骤为液膜扩散。SA17树脂吸附Cl~-过程,ΔG<0,该吸附过程可自发进行;ΔH<0,说明吸附过程放热,焓变值为-23.22k J/mol,说明该吸附过程为物理吸附;ΔS<0,说明该树脂吸附MDEA溶液中Cl~-是熵减过程。红外光谱和能谱分析结果表明,吸附后只是树脂N-OH中的OH-被Cl~-取代,并未改变树脂骨架和功能基团。
Adsorption Removal Effect of Cl ~ - in Alkanaline Solution by Strongly Basic Anion Exchange Resin. The results show that SA17 anion exchange resin has the advantages of strong adsorption capacity for Cl ~ -, large working exchange capacity and fast exchange rate, and is an appropriate de - Cl ~ - adsorbent. When the space velocity υ = 10h ~ (-1), the removal rate of Cl ~ - in SA17 resin was as high as 99% in the first 60min. The adsorption breakthrough curve accorded with Thomas model. The adsorption isotherm Freundlich model could better reflect the SA17 Resin adsorption behavior, rate control step for the liquid film diffusion. SA17 resin adsorption Cl ~ - process, ΔG <0, the adsorption process can spontaneously; ΔH <0, indicating the exothermic adsorption process, the enthalpy change value of -23.22k J / mol, indicating that the adsorption process for the physical adsorption; ΔS < 0, indicating that the resin adsorption MDEA solution Cl ~ - is entropy reduction process. The results of IR and EDS showed that after the adsorption, OH- in the resin N-OH was replaced by Cl ~ - and did not change the resin skeleton and functional groups.