An analytical solution for the analysis of zero-length-column experiments with heat effects

An analytical solution for the analysis of zero-length-column (ZLC) experim ents with heat effects is developed. The model is an extension of the origi nal one developed by Eic and Ruthven with the inclusion of the energy balan ce. Two additional parameters are obtained, beta = (DeltaH/C-p) (partial de rivativeq/partial derivativeT)\ (c0),(T0) and alpha = (ha/C-p)(r(c)(2)/D-c) . A criterion for negligible heat effects, 3L beta/alpha < 0.1, is derived from the analytical solution based on ZLC operating parameters. ZLC desorpt ion curves in nonisothermal operation are discussed. The model reduces to t he original solution of isothermal operation developed by Eic and Ruthven w hen heat effects are negligible. ZLC experiments with heat effects are anal yzed, and trends are in good agreement with theory. Because of its simplici ty, the model is a valuable tool for the analysis of ZLC experiments with h eat effects.