高校化学工程学报2011，Vol.25Issue(1)：49-54,6.
717阴离子交换树脂选择吸附分离水杨酸和苯酚
Selective Adsorption and Separation of Salicylic Acid and Phenol by 717 Anion Exchange Resin
摘要
Abstract
The anion exchange resin 717 was used to selectively adsorb and separate the salicylic acid and phenol from their binary aqueous solution. The adsorption behavior of 717 resin for each adsorbate was studied via both dynamic and static methods. The effects of pH value, adsorbate concentration and adsorption time on the adsorption process were investigated, and the isotherm adsorption and adsorption kinetics were also studied.The experimental results show that the pH value of the solution plays the most important role in the adsorption and separation process. At pH of 4.5, the existence of phenol in the solution essentially does not affect the salicylic acid adsorption of the 717 resin, while when the pH is 11, the phenol can be adsorbed by 717 resin to substitute the adsorbed salicylic acid on it, which substantially decreases the salicylic acid adsorption capacity of the resin. In the pH range of 4～8, the 717 resin has very high selective adsorption ability and adsorption capacity for the salicylic acid, and its adsorption capacity for salicylic acid is more than an order of magnitude larger than that for the phenol. With such high adsorption selectivity, the 717 resin is favorable to be used for the separation salicylic acid from the binary aqueous solution of salicylic acid and phenol. The static adsorptions show that the adsorptions of salicylic acid and phenol by 717 resin are in accordance with Freundlieh isotherm model, and the adsorption kinetics data fit well with the Lagergren pseudo-first order rate equation. Dynamic adsorption of the mixed binary aqueous solution of salicylic acid and phenol by 717 resin shows that, in a column with resin of 1.5 g, the first 475 mL of the exit water after adsorption contains essentially only the phenol because almost all the salicylic acid are adsorbed by the resin. It was found that the salicylic acid adsorbed on the resin can be easily eluted by the 5％NaCl+2％NaOH solution at room temperature.关键词
分离/717树脂/水杨酸/苯酚/选择吸附Key words
separation/ 717 resin/ salicylic acid/ phenol/ selective adsorption分类
化学化工引用本文复制引用
谢祖芳,童张法,陈渊,晏全,李凤,吴燕平..717阴离子交换树脂选择吸附分离水杨酸和苯酚[J].高校化学工程学报,2011,25(1):49-54,6.基金项目
广西自然科学基金项目(0991285). （0991285）
