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ASCEND IV
A free, equation-based environment for process modeling. Includes an object-oriented model-description language. Released under GNU for Win95/NT and UNIX platforms.

Aspen Dynamics^TM
Integrated steady-state and dynamic process simulator based on Aspen Plus and Aspen Custom Modeler.

Aspen Plus
Information about this standard process simulation package for steady-state modeling from the supplier.

Aspen Plus Virtual Library
Archives at the University of Florida Chemical Engineering Department with many examples, case studies, and tutorials on using Aspen Plus. Hasn't been updated for some time.

CHEMCAD
Chemstations' PC-based general purpose process simulation program.

Chemical Process Modeling PC Software
Excel add-ins, Mathcad and Maple files from Lee Partin for chemical plant modeling, distillation design calculations, pinch analysis... The software is copyrighted but free for personal or educational use.

Chemical Workbench Code
Package of integrated chemical reactor simulation tools for Windows 95/NT from Kinetic Technologies, Russia. A PowerPoint presentation of the program (3.8 MB) can be downloaded after completing a form.

DESIGN II for Windows
WinSim's general-purpose process simulator developed specifically for MS Windows (either Win 95/NT or Win 3.1/3.11 with Win32s). The full package is available free for download but you must register to get a 2 week password.

Distil Simu
Binary distillation simulator based on McCabe-Thiele method. For MS Windows platforms. No demos available.

HYSIM
Steady state process simulator for the PC from Hyprotech. Incorporates a wide range of unit operations, heat exchanger design, compressors, valves, and extensive thermophysical property data.

HYSYS
Integrated package from Hyprotech that covers all process simulation and real-time applications. Flowsheet based dynamic and steady state process modeling. For MS Windows 32 bit platforms.

Kemsimp
Somewhat limited and awkward to use MS-DOS program for chemical process material balance simulation and parameter optimization. But it's free. 240 kB to download.

MASSBAL
Low cost, open equation based process simulator for steady state and dynamic modeling and equipment sizing, MS Windows 9x/NT.

Membrane Process Modelling Software
Several programs for membrane modelling and related fields. Software is distributed free of charge but may not be used for commercial purposes. This site is in South Africa which explains the sometimes low transfer rates.

POLYSIM
Polymer Process Simulator from Hyprotech for MS Windows 32 bit platforms.

Prode Calculator
Determination of physical properties, heat and material balances, process simulation, equipment design, and separations (VLE, LLE) on the PC. Evaluation copy for Windows 95 can be downloaded after completing a form to get a password.

PRO/II
General-purpose process simulator from SIMSCI. Wide range of applications. Windows 95/NT or UNIX Workstations. Demo available.

PROSIM
General-purpose process simulator from Bryan Research & Engineering for DOS/Windows based PC's and UNIX systems. Demos available on BR&E's FTP Server.

Quick Hydraulics for Windows
Flowsheet simulation plus hydraulic pressure drop calculation for Windows 3.1/95/NT from Chempute Software. Lacks some of the features of other process simulators for the benefit of lower cost. Restricted demo (2.7 MB) available.

Simons IDEAS
A dynamic simulation tool that allows modeling of steady state, dynamic and discrete event processes with controls all on the same worksheet. Versions for Windows and Macintosh available.

Sizing and Prizing Tray Columns
From Christopher M. A. Haslego, Excel spreadsheet for preliminay sizing and cost estimation of distillation columns with internal trays.

Software Tools for Process Integration
An independent list of process simulation tools from Aspen Plus to Supertarget. For each program there are a short description, product specification, and user experience evaluations.

SuperPro Designer
Process simulation program for Win 3.11/95 from Intelligen. Includes equipment sizing and costing. Demo can be downloaded (total 8 MB!) and is fully functional except for the ability to save the designs.