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A study on the kinetics of ethanol-activated carbon fiber: Theory and experiments

机译：乙醇活化碳纤维动力学的理论与实验研究

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摘要

An experimental and theoretical study has been conducted on the adsorption kinetics of ethanol onto a pitch-based activated carbon fiber (ACF) of type (A-20). Experiments have been carried out across assorted adsorption temperatures that are useful to the operation of adsorption chillers. The kinetic curve for each isotherm is measured accurately using a thermal-gravimetric analyzer (TGA) from which the diffusion time constant and consequently, the overall mass transfer coefficient could be evaluated. A novel concentration profile, with an exponent parameter k, has been proposed in the theoretical model which accounts for the effect of meso- and micro-pore structures within the ACF. The proposed concentration profile removes the restrictions between the overall mass transfer coefficient and the diffusion time constant. Using the measured kinetics, the numerical value of k is evaluated, leading to a new form of the linear driving force (LDF) model for cylindrical adsorbent that could capture the higher ethanol uptake in ACF and this LDF model has been validated experimentally.
机译：已对乙醇在（A-20）型沥青基活性炭纤维（ACF）上的吸附动力学进行了实验和理论研究。已经在对吸附式冷却器的操作有用的各种吸附温度上进行了实验。使用热重分析仪（TGA）可以精确测量每个等温线的动力学曲线，从中可以计算出扩散时间常数，从而可以评估整体传质系数。在理论模型中提出了一种具有指数参数k的新型浓度曲线，该曲线解释了ACF内中孔和微孔结构的影响。建议的浓度曲线消除了总传质系数和扩散时间常数之间的限制。使用测得的动力学，对k的数值进行了评估，从而得出了一种新型的圆柱形吸附剂线性驱动力（LDF）模型，该模型可以捕获ACF中更高的乙醇吸收量，并且该LDF模型已经通过实验验证。

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