Gas Sub-Cooled Process (GSP) Calculator

About Gas Sub-Cooled Process

The Gas Sub-Cooled Process (GSP) is an advanced cryogenic process that uses split-vapor reflux to the demethanizer to achieve high ethane recovery while maintaining good column efficiency.

Process Advantages

• High Recovery: 85-95% ethane recovery typical
• Reduced Recompression: Lower horsepower vs. full reflux
• Flexible Operation: Easy ethane rejection/recovery switching
• Proven Technology: Widely used in industry

Key Features

• Split vapor provides cold reflux to demethanizer
• Main fraction expanded for maximum cooling
• Reduced CO₂ freezing risk vs. full reflux
• Lower capital cost than dual expander designs

Design Considerations

• Split ratio affects recovery and energy balance
• Subcooler performance critical for efficiency
• CO₂ content must be controlled (typically <2%)
• Integration with residue gas compression important