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Removal and recovery of dichloromethane via adsorption-desorption thermal process.

机译：通过吸附-解吸热过程除去和回收二氯甲烷。

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Four polymeric resin adsorbents, Amberlite XAD-4, XAD-7HP, IRA-96 and Ionac AFP-329, and activated carbon were compared to establish their abilities for the removal of dichloromethane from synthetic wastewater. The equilibrium time, efficiency and capacity were established for all resins. The results obtained showed XAD-4 to be the best among the polymeric adsorbents in the adsorption of dichloromethane. While all the adsorbents had similar equilibrium times, XAD-4 was superior in efficiency and capacity. These adsorption properties were used to prepare adsorption isotherms for each adsorbent, using the Langmuir isotherm and Freundlich isotherm models. The Freundlich isotherm was found to fit the data reasonably well.; The adsorptive characteristics of XAD-4, AFP-329 and activated carbon were found to be sufficient to warrant data collection on their desorption behavior. Jacketed columns packed with each adsorbent were used to study their adsorption and desorption of dichloromethane. XAD-4 provided the most promising results. The adsorption process was conducted at room temperature and desorption was initiated by elevating the column temperature to 50°C.; The results observed suggest that XAD-4, and possibly AFP-329, might be viable alternatives to the traditional activated carbon in the removal of dichloromethane from industrial wastewater. The development of a more successful regeneration step might contribute to the applicability of this process on a large scale.
机译：比较了四种聚合树脂吸附剂，Amberlite XAD-4，XAD-7HP，IRA-96和Ionac AFP-329，以及活性炭，以确定它们从合成废水中去除二氯甲烷的能力。建立了所有树脂的平衡时间，效率和容量。所得结果表明，XAD-4在吸附二氯甲烷中是最好的聚合物吸附剂。尽管所有吸附剂的平衡时间相似，但XAD-4的效率和容量均优越。使用Langmuir等温线和Freundlich等温线模型，将这些吸附特性用于准备每种吸附剂的吸附等温线。发现Freundlich等温线很好地拟合了数据。发现XAD-4，AFP-329和活性炭的吸附特性足以保证有关其解吸行为的数据收集。使用填充有每种吸附剂的夹套柱来研究它们对二氯甲烷的吸附和解吸。 XAD-4提供了最有希望的结果。吸附过程在室温下进行，并通过将柱温升至50°C开始解吸。观察到的结果表明，在从工业废水中去除二氯甲烷时，XAD-4（可能还有AFP-329）可能是传统活性炭的可行替代品。开发更成功的再生步骤可能有助于该方法的大规模应用。

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