At a glance
Supercritical CO2 Extraction
ScopeSolubility in scCO2
CAPEX$500k-$3M
Best forLipid / pigment extraction
vs
Liquid-Liquid Extraction
ScopePartition coefficient
CAPEX$200k-$1.5M
Best forHydrophobic small molecule recovery
Decision criteria
| Criterion | Supercritical CO2 Extraction | Liquid-Liquid Extraction | Verdict |
|---|---|---|---|
| Separation principle | Lipid / pigment extraction | Hydrophobic small molecule recovery | scCO2 vs organic solvent |
| Throughput / scale | 10-1,000 kg/hr | 100-10,000 L/hr | LLE higher at scale |
| Capital cost | $500k-$3M | $200k-$1.5M | scCO2 much higher |
| Operating cost | High pressure energy | Solvent recovery | Application-dependent |
| Product purity ceiling | Solvent-free product | Solvent residue risk | scCO2 cleaner |
Quick verdict
Premium lipophilic products with strict solvent specs: scCO2. Industrial bulk recovery: LLE.
Rule of thumb: Food/nutra grade lipid? scCO2. Industrial chemical recovery? LLE.
Frequently Asked Questions
When should I choose Supercritical CO2 Extraction over Liquid-Liquid Extraction?
Use scCO2 for high-value lipophilic products (carotenoids, omega-3, essential oils) where solvent residue is unacceptable — nutraceuticals, cosmetics.
When should I choose Liquid-Liquid Extraction over Supercritical CO2 Extraction?
Use LLE for bulk recovery where organic solvent residues are acceptable or easily removed — fermentation broth extraction.
Can these two techniques be used together?
Rarely combined directly; both are alternatives to each other for the same recovery problem.
Which has lower OPEX at scale?
scCO2 has higher CAPEX and energy but no solvent purchase or disposal. LLE wins at multi-ton scale.
Read more on each technique
Try both in your flowsheet
Build a process with each option side by side and compare yield, purity, and cost.
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