An ASPEN model has been developed of the Gas Compression and Drying Flowsheet, Section 1900, of the Great Plains Gasification Plant. The basis for this model is the process description given in section 6.14 of the Great Plains Project Management Plan, and the Lummus Schematic Process Flow Diagram, Dwg. No. SK D-7102-IJ-2. The TEG Drying section is a standard adsorbing and stripping operation. Operating conditions for the towers were obtained from the Gas Condition Fact Book published by the Dow Chemical Company. The ASPEN model that has been developed uses an abbreviated list of components, since not all the components appear in the product. Furthermore, since a Henry's Law model with Wilson activity coefficients is used to predict vapor/liquid equilibrium, it would have required a large effort to enter the Henry's Law parameters for all the components that ultimately would not be used because they are not found in the product streams. The model is primarily a flowsheet simulation that will give the material and energy balances and equipment duties for a given set of process conditions. The model is unable to predict fully changes in process conditions that would result from flow load changes on equipment of fixed sizes, such as a rating model would. The model can be used to simulate the steady-state operation of the plant at or near design conditions, or to design other Gas Compression and Drying Systems. TEG flowrate is varied to meet the water specification in the product gas. No convergence problems were experienced running the model. Several runs were made to study the response of the model to changes in the feed flowrate, product specification, and number of trays in the absorber. 5 references.