Chi Ma , Lihong Zhao , Zhengxin Mao , Hao Su , Qingfen Liu
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引用次数: 0
摘要
工业制药废水中通常含有浓度为 1 wt%-7 wt% 的乙酸丁酯(BA),传统的乙酸丁酯回收方法是蒸馏,能耗较高。为了高效、低能耗地回收低浓度的乙酸丁酯,开发了吸附法。采用悬浮聚合法成功合成了大孔结构为 233.1 nm、平均粒径约为 526.5 μm 的中极性聚丙烯酸酯树脂,并将其用于 BA 的吸附和解吸。其最大吸附容量达到 171.1 mg g-1,相对标准偏差(RSD)值为 0.2%,是文献结果的两倍多。在 100 °C 条件下,BA 的解吸率为 97.0%,RSD 值为 0.4%,树脂在吸附-解吸循环中有利于重复使用。对吸附热力学和动力学进行了研究,发现随着无序度的增加,BA 吸附是一个自发的内热过程。该过程主要由物理吸附促成,并与 Freundlich 模型和伪一阶吸附动力学模型吻合。该吸附法避免了大量废水的沸腾,有望为 BA 回收提供一种新的替代技术。
Alternative technology for the recovery of butyl acetate with low concentration: high capacity adsorbent and high efficiency adsorption
Industrial pharmaceutical wastewater usually contains butyl acetate (BA) with a concentration of 1 wt%–7 wt%, and the traditional method for BA recovery is distillation with high energy consumption. Adsorption method is developed to recover BA with low concentration for the high efficiency and low energy consumption. Medium polar polyacrylate resins with macroporous structure of 233.1 nm and average particle size of about 526.5 μm are successfully synthesized by suspension polymerization and used for the BA adsorption and desorption. The maximum adsorption capacity reaches 171.1 mg g−1 with relative standard deviation (RSD) value of 0.2%, which is more than twice the results in the literature. The BA desorption rate is 97.0% at 100 °C with RSD value of 0.4%, and the resins are beneficial to the reuse in the adsorption-desorption cycle. The adsorption thermodynamics and kinetics are investigated, and the BA adsorption is a spontaneous and endothermic process with the increase of disorder degree. This process is mainly contributed by physical absorption and agree well with Freundlich model and pseudo-first-order adsorption kinetic model. The adsorption method avoids boiling a large amount of wastewater and hopefully provides a novel alternative technology for the BA recovery.