To investigate the influence of fluid purity on the adsorption properties, adsorption kinetics and adsorption equilibria of two methanol samples with different water content on an activated carbon were studied. The purity of the methanol samples was 98.5% and 99.9%. Measurements were conducted at 298 K and 318 K using a magnetic suspension balance and cover a wide p/p₀ range. To determine effective diffusion time constants and mass transfer coefficients, adsorption kinetics were evaluated using an isothermal and a nonisothermal Fickian diffusion model, and the linear driving force model. The pressure dependence of the kinetic parameters was studied and discussed. A small influence of sample purity on the adsorption equilibria was observed, as the purer methanol sample showed slightly higher equilibrium loadings than the less pure sample. However, significantly faster adsorption kinetics were observed for the purer sample at all temperature and pressure conditions. Compared to the less pure sample, the determined effective diffusion time constants and the mass transfer coefficients were up to 98% and 35% higher, respectively.

为了研究流体纯度对活性炭上不同含水量的两种甲醇样品的吸附性能、吸附动力学和吸附平衡的影响。甲醇样品的纯度分别为 98.5% 和 99.9%。使用磁悬浮天平在 298 K 和 318 K 下进行测量，覆盖范围很广p / p ₀范围。为了确定有效扩散时间常数和传质系数，使用等温和非等温 Fickian 扩散模型以及线性驱动力模型评估吸附动力学。研究和讨论了动力学参数的压力依赖性。观察到样品纯度对吸附平衡的影响很小，因为较纯的甲醇样品显示出比纯度较低的样品略高的平衡负载。然而，在所有温度和压力条件下，对于更纯的样品，观察到明显更快的吸附动力学。与纯度较低的样品相比，确定的有效扩散时间常数和传质系数分别高出 98% 和 35%。