CH_4/CO_2混合组分在13X分子筛上的吸附平衡及分离性能  

Adsorption Equilibrium and Separation of Methane and Carbon Dioxide Mixtures on 13X Molecular Sieve

作　　者：陆江园[1] 刘伟[1] 孙林兵[1] 刘晓勤[1] 

机构地区：[1]南京工业大学化学化工学院材料化学工程国家重点实验室,江苏南京210009

出　　处：《高校化学工程学报》2013年第1期1-6,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(20976082);江苏省高校自然科学重大基础研究项目(08KJA530001)

摘　　要：采用高精度智能重量分析仪IGA-100对13X分子筛进行CH4、CO2的吸附分离实验。于298、310、326 K温度下,分别测定了CH4、CO2纯组分及混合组分的吸附等温线。纯组分吸附等温线用DL(Double-Langmuir)模型拟合,并通过DL-IAST(Ideal Adsorbed Solution Theory,IAST)模型与实验测定值进行比较。利用该模型计算出不同温度下混合气中各组分的吸附量,得到了CO2的吸附选择性。结果表明,DL-IAST模型可以准确地描述CH4、CO2在13X分子筛上的吸附行为。在298 K时,随着压力的增加,CO2的吸附选择性增加,最后稳定在80左右;当温度一定时,CO2吸附选择性随着混合物中CO2浓度增加而减小。Pure gas and binary gas mixture adsorption isotherms of methane and carbon dioxide on 13X molecular sieve were measured by using the high-precision intelligent gravimetric analyzer at temperature of 298,310 and 326 K,respectively.Double-Langmuir model was used to study the pure gas adsorption;the DL model and the ideal adsorbed solution theory（IAST） were combined to predict the binary gas mixture adsorption isotherms and using the model,the adsorption amount of the single component of gas mixture and the selectivity of CO2 were calculated.It shows that the combined method（DL-IAST） can be applied to describe the adsorption of CH4 and CO2 binary mixtures on 13X molecular sieve perfectly.The selectivity of CO2 increases with increasing pressure and finally reaches 80 at 298 K;when the temperature is constant,the selectivity of CO2 decreases with increasing the CO2 concentration.

关 键 词：甲烷 二氧化碳 理想吸附溶液理论(IAST) 吸附选择性 

分 类 号：TQ028.15[化学工程]