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The experimental results of CO 2 adsorption and desorption in a packed column indicated that the concentration wave front at the center of the packed column differs from those which are close to the wall of column filled with adsorbent material even though the ratio of column diameter to the particle size is greater than 20, Mohamadinejad and Knox (2000). The comparison of the experimental results with one dimensional model of packed column shows that in order to simulate the average breakthrough in a packed column a two dimensional (radial and axial) model of packed column is needed, Mohamadinejad (1999). In this paper the mathematical model of a non-slip flow through a packed column with 2 inches in diameter and 18 inches in length filled with 5A zeolite pellets is presented. The 1 https://ntrs.nasa.gov/search.jsp?R=20020023253 2018-05-13T05:25:44+00:00Z