From Citizendium, the Citizens' Compendium
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- Complete, detailed oil refinery description
- Petroleum Refining Excellent, detailed overview of petroleum refining processes.
- Oil Refinery Processes, A Brief Overview
- Petroleum Refining Processes (Lecture Notes)
- Modern Refinery Website of Delft University of Technology, Netherlands
Natural gas processing
- Processing Natural Gas a website maintained by the Natural Gas Supply Association.
- Natural Gas Processing (part of the U.S. EPA's AP-42 publication Compilation of Air Pollutant Emission Factors)
- Natural Gas Processing Plants (a US Department of Transportation website)