Premium
A new empirical scaling equation for accurate prediction of gaseous species equilibrium adsorption on activated carbon
Author(s) -
Erfani Gahrooei Hamid Reza,
Joonaki Edris
Publication year - 2018
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.2220
Subject(s) - adsorption , isothermal process , scaling , activated carbon , natural gas , thermodynamics , work (physics) , biogas , langmuir , range (aeronautics) , langmuir adsorption model , chemistry , mathematics , biological system , materials science , physics , engineering , waste management , organic chemistry , geometry , biology , composite material
Adsorption models have many applications in industry such as in gas separation and/purification, natural gas storage, and CO 2 capture. In this work, a simple and robust method is introduced for calculation of natural gas and biogas adsorption on activated carbon, which is not only less complex than existing models but also not limited to isothermal condition. The proposed equation collapses the experimental data at different temperatures into a single linear curve, from which the adsorbed amounts at equilibrium can be calculated for any desired pressure and temperature in the range of experimental data. Model parameters are also calculated and presented for different gas components on activated carbon, and the accuracy of the proposed model is compared with that of three most common adsorption isotherms. As a result, the proposed scaling equation approach is shown to be more accurate and robust than the Langmuir and Sips models. Also, although application of these models is limited to isothermal condition, the proposed model is temperature dependent. It is shown that the proposed model predicts the experimental data with less than 4% error in term of sum of squared errors, and with correlation factors ( R 2 ) higher than 0.95, which demonstrate the applicability of the developed approach. Proposed scaling equation scheme could help adsorption‐based process design and separation or purification of mainly CH 4 from natural gas and/or biogas streams with distinct CO 2 ‐based contents along with a decrease in necessity of experimental data to address these purposes.