Background

We present a dynamic model for designing a rotating packed bed (RPB) demonstrating volatile organic compound absorptions with circulation. The developed RPB model can be applied for industrial process simulations and scale-up.

Methods

The industrial applicability of the model was validated using in-house steady-state and dynamic RPB experimental data. The absorption of acetic acid (AA) in gas stream by an RPB, evaluated using reverse osmosis (RO) water and 1 wt.% NaOH aqueous solution, established the model. The operational variables’ effects, such as rotational speed and gas to liquid ratio, on the AA absorption efficiency are discussed.

Significant findings

The height of transfer unit (HTU) of the RPB was less than 3 cm, indicating the superior mass-transfer efficiency of the RPB than that of conventional packed bed column. The RPB model could predict the HTU in a steady-state well for the AA absorption, and the average absolute deviations (AAD) of HTU for the absorbent using RO water and 1 wt.% NaOH solution were 19.2% and 15.2%, respectively. Furthermore, the RPB model accurately predicted the AA absorption in circulation well for 1 wt.% NaOH with initial AA loadings of 1.7, 1.9, and 2.0 wt.% and AADs of 3.5%, 1.7%, and 1.9%, respectively.

中文翻译：

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旋转填充床吸收乙酸的动力学模型

背景

我们提出了一个用于设计旋转填充床 (RPB) 的动态模型，该模型展示了循环中挥发性有机化合物的吸收。开发的 RPB 模型可用于工业过程模拟和放大。

方法

使用内部稳态和动态 RPB 实验数据验证了模型的工业适用性。使用反渗透 (RO) 水和 1 wt.% NaOH 水溶液评估 RPB 对气流中乙酸 (AA) 的吸收，建立了模型。讨论了转速、气液比等操作变量对AA吸收效率的影响。

重要发现

RPB 的传输单元高度 (HTU) 小于 3 cm，表明 RPB 的传质效率优于传统填充床柱。RPB模型可以预测AA吸收的稳态井中的HTU，使用RO水和1 wt.% NaOH溶液的吸收剂的HTU平均绝对偏差（AAD）分别为19.2%和15.2%。此外，RPB 模型准确预测了 1 wt.% NaOH 在循环井中的 AA 吸收，初始 AA 负载量分别为 1.7、1.9 和 2.0 wt.%，AAD 分别为 3.5%、1.7% 和 1.9%。