多孔陶瓷膜毛细管冷凝分离传质模型

MODEL OF CAPILLARY CONDENSATION MECHANISM IN POROUS CERAMIC MEMBRANES

多孔陶瓷膜在毛细管冷凝传质机理的作用下能够有效地分离吸附性气体。而毛细管冷凝膜分离传质机理的研究还很不充分,目前,文献报道仅局限于纯组分气体的传质模型研究。本文以改性氧化铝膜对乙醇-水物系的蒸气渗透分离过程为研究对象,优选出了二元气体在毛细管冷凝膜分离过程中的组分渗透系数的计算模型;建立了多孔陶瓷膜的传质模型,对蒸气渗透分离过程的模拟证实了该模型的可靠性。

Adsorbable gases can be separated by porous ceramic membranes under the capillary condensation mechanism of membrane separation, on which prior study was only limited to pure components. Based on researches of vapor permeation separation of ethanol - water mixtures via modified alumina membranes, this paper optimizes the model equations of capillary condensation mechanism for membrane separation of binary gas mixtures which can calculate the permeability of binary gas mixtures accurately and established the transfer model in porous ceramic membranes which is proved reliable by simulating vapor permeation separation.