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Most commonly referring to butane or propane extraction, closed-loop extraction is a chemical extraction process that recycles hydrocarbon solvent or CO2 in a closed system, opposed to releasing the gas into the air. The closed-loop method is far safer than open blasting, and Colorado concentrate producers are required to use this process by law.


“People who use open blasting can blow up their house, that's why a closed-loop extraction process is much safer”