Controlled-Freeze-Zone Technology for the Distillation of High-CO2 Natural Gas

The simple separation of carbon dioxide (CO₂) from natural gas by distillation would involve cryogenic temperatures at which CO₂ solidifies. Most CO₂-separation processes instead use solvents that bind to CO₂ molecules. For solvent regeneration, the binding process is reversed. The technology described by the authors provides the simplicity of a single-step distillation process for the separation of CO₂ from natural gas.