What is the main difference between CO2 and hydrocarbon extraction?

CO2 extraction uses carbon dioxide in a supercritical or subcritical state to dissolve target compounds from plant material, leaving no flammable solvent residue and allowing operators to tune selectivity by adjusting temperature and pressure. Hydrocarbon extraction uses light flammable solvents — typically butane, propane, or isobutane — to strip non-polar compounds very quickly, producing terpene-rich concentrates with short cycle times but requiring a C1D1-rated facility to manage the fire and explosion risk.

Does CO2 extraction require a C1D1 room?

No. Carbon dioxide is non-flammable, so CO2 extraction does not trigger the electrical classification requirements that apply to hydrocarbon solvents. Hydrocarbon extraction rooms must have C1D1-rated electrical equipment throughout because the solvents used — butane, propane, and isobutane — are flammable and can create ignitable vapor concentrations in the event of a leak.

Which extraction method produces better terpene retention?

Cold hydrocarbon extraction, particularly using propane or propane-butane blends at sub-zero temperatures, is generally regarded as superior for preserving intact terpene profiles. CO2 extraction can retain terpenes, especially at subcritical pressures, but the higher process temperatures and pressures involved in supercritical runs tend to degrade or volatilize the most sensitive aromatic fractions. For live resin and full-spectrum terpene-forward products, most operators choose hydrocarbon.

How long does a CO2 extraction run take compared to hydrocarbon?

CO2 extraction cycles are substantially longer. Decimal's 20.LE CO2 Extractor runs 3–5 hours per cycle depending on biomass quality, and the 100.C runs 2.5–3 hours. By contrast, Decimal's HX hydrocarbon systems operate at an approximate 30-minute cycle time across the line. The throughput gap is real, though it should be weighed against downstream processing differences — CO2 extracts often require more post-processing steps before reaching a finished product.

Can one facility run both CO2 and hydrocarbon extraction?

Yes, and many commercial operations do exactly that. Because the two methods produce different extract profiles, they are commonly paired: CO2 for distillate, food-grade, and pharmaceutical outputs, and hydrocarbon for craft concentrate SKUs. The facility will need a dedicated C1D1-rated space for the hydrocarbon equipment and a separate area for the CO2 system, so building layout and permitting must account for both classifications.

CO2 vs. Hydrocarbon Extraction: Which Method Is Right for You?

Compare supercritical CO2 and hydrocarbon (BHO) extraction on solvent chemistry, selectivity, C1D1 requirements, throughput, and end products. Includes verified Decimal specs.