Downloading Aspen Process Tools 2006 20.0 from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this software available. The most popular version of the program is 20.0. The program lies within Education Tools, more precisely Science Tools. We recommend checking the downloaded files with any free antivirus. This software was originally developed by AspenTech.
From the developer:
Aspen Process Tools is a collection of software programs focused on solids and separations processes. It is based on over 25 years of experience with research and industrial applications by SPS (Separation Processes Service), WSHP (Wet Solids Handling Project) and EPC (Effluent Processing Club). Besides the chemical and process industries, it is applicable to the pharmaceuticals, food and beverage, minerals processing, and manufacturing sectors.
You may want to check out more software, such as Aspen Online Deployment, GE06 Digital Broadcasting Notice Processing Tool or Aspen Simulation Workbook, which might be similar to Aspen Process Tools 2006.