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—The isotope separation column process presented in this article represents a space propagation process modeled by second-order quasi-linear equations with two independent variables. The new approach of Cohen's equation using a second-order differential equation in relation to time variable t and spatial variable s is presented. For this stage of development, for variables and there is a limitation of two time constants ( ), or space constants ( ). Also, and evolutions are exponentially increasing, resulting that the phenomenon is cumulative, both in relation to time and in relation to the propagation space. In this case, results a family of curves of the concentration.

Preliminaries of Structural Parameters Approximation Through Transcendence Equations for an 15N Isotope Separation Column