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用D201阴离子交换树脂从脱硫废液中分离硫氰酸根 预览 被引量:16

Separating SCN^- from desulphurization waste solution with D201 anion exchange resin
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摘要 研究了用D201阴离子交换树脂交换焦炉脱硫废液中的硫氰酸根(SCN^-),对SCN^-质量浓度为1.58mg/mL的废液,其静态交换容量及平衡时间分别为273.8mg/g、90min,动态交换容量及平衡时间分别为135.6mg/g、15min,温度、废液SCN^-质量浓度对D201树脂交换硫氰酸根无显著影响;对20g饱和交换SCN^-的D201树脂,洗脱硫氰酸根最佳条件为:氨水浓度0.6mol/L,过柱流速60mL/h。在此条件下,洗30min时,洗脱液中SCN^-质量浓度达到138.8mg/mL;洗45min时,79.1%的SCN^-被洗脱;结晶洗脱液,获得NH4SCN晶体,其中硫氰酸根质量分数为53.34%,相当于NH4SCN质量分数为69.89%。 The process of exchanging SCN^- from desulphurization waste solution with D201 anion exchange resin is studied. The static exchange capacity and equilibrium time are 237. 8 mg/g resin and 90 min; the dynamic exchange capacity and equilibrium time are 135.6 mg/g resin and 15 min while the concentration of SCN^- is 1.58 mg/mL. There isn't apparent influence about the exchanging SCN^- with different temperature and SCN^- concentration of desulphurization waste solution. The optimal condition of elu- ring SCN^- is that the concentration of NH3 · H2O is 0. 6 mol/L, and the speed of flow is 60 mL/h for 20 g D201 anion exchange resin saturated by SCN^-. The concentration of SCN^- in the eluting resolution arrives to 138.8 mg/mL at 30 min, and 79.1% of SCN^- is exchanged by D201 anion exchange resin after eluted for 45 min. Condensing the eluting resolution, NH4SCN crystal is obtained in which the mass fraction of SCN^- is 53· 34% or the mass fraction of NH4SCN is 69.89% after condensing.
作者 郑申声 周小华 陈迅 Zheng Shensheng, Zhou Xiaohua, Chen Xun (College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China)
出处 《化学工业与工程技术》 CAS 2007年第4期 12-15,共4页 Journal of Chemical Industry & Engineering
关键词 硫氰酸根 D201树脂 阴离子交换 SCN^- D201 resin Anion exchange
作者简介 郑申声(1982--),男,安徽合肥人,化学工程硕士在读,研究方向为分离工程。E-mail:shensheng@163.com
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