正构烷烃n-C4^0～n-C10^0在5A分子筛上的多组分吸附CIAS模型  

Constant-capacity ideal adsorption solution model for adsorption process of n-C4^0～n-C10^0 on 5A molecular sieves

作　　者：刘纪昌[1] 沈本贤[1] 

机构地区：[1]华东理工大学化学工程联合国家重点实验室,上海200237

出　　处：《化工学报》2008年第12期3078-3084,共7页CIESC Journal

基　　金：国家重点基础研究发展计划项目(2006CB202501)~~

摘　　要：为了适应研究5A分子筛吸附分离石脑油工艺的需要,建立了适用于正构烷烃-5A分子筛体系的多元混合气体等量理想吸附溶液(CIAS)模型,可以预测不同温度、压力下n-C40～n-C100混合气体多组分在5A分子筛上的的吸附平衡。CIAS模型给出了石脑油中n-C40～n-C100各组分在5A分子筛上的平衡吸附量,以及压力对各组分吸附量的影响,从热力学角度揭示了不同碳数正构烷烃之间的相互作用,可以解释n-C40～n-C100的竞争吸附行为。CIAS模型可以预测石脑油中n-C40～n-C100在5A分子筛上的总平衡吸附量,与实验平衡吸附量相比,误差在4%～8%,可以满足研究5A分子筛吸附石脑油中正构烷烃的工程设计的要求。CIAS模型适用于单位吸附剂对不同吸附质纯物质的平衡吸附量相同或相近的混合气体吸附。For separating normal paraffins in naphtha through the adsorption process using 5A molecular sieves, the ideal adsorption solution model for the mixed gas adsorption process has been improved based on the experimental data. The constant-capacity ideal adsorption solution （CIAS） model for the normal paraffins-SA molecular sieves system was established. The model could predict the equilibrium of n-C4^0～n-C10^0 mixed gas in 5A molecular sieves at various temperatures and pressures. The individual equilibrium adsorption capacities of n-C4^0～n-C10^0 and the effects of the pressure on the capacities could be calculated. So the interactions between the normal paraffins with different carbon numbers were discovered in view of thermodynamics, and the competing adsorption behavior of n-C4^0～n-C10^0 could be explained. The total equilibrium adsorption quantity of n-C4^0～n-C10^0 in naphtha predicted by CIAS model was 4%-8% greater than the experimental equilibrium adsorption quantity. The CIAS model also can be used for the mixed gas adsorption process, in which the individual equilibrium adsorption capacities of the adsorbates are approximately the same.

关 键 词：正构烷烃 分子筛 吸附模型 

分 类 号：TQ028.15[化学工程]