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首次采用阴离子交换树脂吸附去除沉淀亮氨酸后的氨基酸废水中的邻二甲苯-4-磺酸沉淀剂。实验发现,201×7阴离子交换树脂对邻二甲苯-4-磺酸有很强的吸附能力,在水溶液、4mol/L HCl及4mol/L NH4Cl中的吸附率分别为100%、93%、95%。常规的电解质水溶液无法解吸树脂上吸附的邻二甲苯-4-磺酸,但适当浓度的乙醇+盐酸溶液可有效解吸。最佳吸附-解吸工艺条件为:离子交换树脂柱,26×1000mm,玻璃柱,内装500ml 201×7树脂;氨基酸废水正上柱吸附,上柱流速1BV/h,上柱体积4BV;用自来水洗至无色,再用60%乙醇+1mol/L盐酸解吸液反洗,洗脱流速2BV/h,解吸液体积3BV。本方法可有效去除氨基酸废水中的邻二甲苯-4-磺酸,回收的沉淀剂具有和新制沉淀剂相同的功效。
For the first time, an anion exchange resin was used to adsorb the o-xylene-4-sulfonic acid precipitant in the amino acid wastewater after the leucine was precipitated. The results showed that the adsorption capacity of 201 × 7 anion exchange resin on o-xylene-4-sulfonic acid was 100%, 93%, 95% respectively in aqueous solution, 4mol / L HCl and 4mol / L NH4Cl %. The conventional electrolyte aqueous solution can not desorb the o-xylene-4-sulfonic acid adsorbed on the resin, but an appropriate concentration of ethanol + hydrochloric acid solution can desorb effectively. The optimum adsorption-desorption process conditions were: ion exchange resin column, glass column, 26 × 1000mm, containing 500ml 201 × 7 resin; amino acid wastewater was adsorbed on the column, the column flow rate 1BV / h, the column volume 4BV; washed with tap water To colorless, and then backwash with 60% ethanol + 1mol / L hydrochloric acid desorption solution, elution flow rate 2BV / h, desorption volume 3BV. The method can effectively remove the o-xylene-4-sulfonic acid in the amino acid waste water, and the recovered precipitant has the same efficacy as the new precipitant.