{"id":623,"date":"2023-09-22T07:34:13","date_gmt":"2023-09-22T07:34:13","guid":{"rendered":"https:\/\/www.buffaloextracts.com\/knowledge\/?p=623"},"modified":"2026-06-24T09:31:58","modified_gmt":"2026-06-24T09:31:58","slug":"safe-co2-extraction-methods","status":"publish","type":"post","link":"https:\/\/www.buffaloextracts.com\/knowledge\/safe-co2-extraction-methods\/","title":{"rendered":"What Are The Safe CO2 Extraction Methods? What\u2019s The Method Your Business Must Choose?"},"content":{"rendered":"

If you are researching extraction for your business, one of the first questions you will have is: Is CO2 extraction safe? The direct answer is yes - significantly safer than the main alternatives. CO2 is non-toxic, non-flammable, and leaves no solvent residue in the final product. But choosing the right CO2 extraction approach matters too: there are four distinct types, and each suits different raw materials and target compounds. This guide explains both clearly.<\/span><\/p>\r\n

Understanding which CO2 extraction approach fits your specific situation is as important as knowing that CO2 extraction itself is safe. The four types range from standard supercritical to subcritical, modified co-solvent, and fractionated, and each has a different application profile.<\/span><\/p>\r\n

Is CO2 Extraction Safe? How It Compares to Alternatives<\/b><\/h2>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
\r\n

Safety Factor<\/b><\/p>\r\n<\/td>\r\n

\r\n

CO2 Extraction<\/b><\/p>\r\n<\/td>\r\n

\r\n

Ethanol Extraction<\/b><\/p>\r\n<\/td>\r\n

\r\n

Hydrocarbon Extraction<\/b><\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

Flammable?<\/span><\/p>\r\n<\/td>\r\n

\r\n

No - CO2 is non-flammable<\/span><\/p>\r\n<\/td>\r\n

\r\n

Yes - ethanol is highly flammable<\/span><\/p>\r\n<\/td>\r\n

\r\n

Yes - extremely flammable, explosion risk<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

Explosion risk<\/span><\/p>\r\n<\/td>\r\n

\r\n

None from CO2 itself<\/span><\/p>\r\n<\/td>\r\n

\r\n

Significant - ATEX-rated facility required<\/span><\/p>\r\n<\/td>\r\n

\r\n

Very high - Class 1 Division 1 facility required throughout<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

Residue in product<\/span><\/p>\r\n<\/td>\r\n

\r\n

Zero - CO2 reverts to gas<\/span><\/p>\r\n<\/td>\r\n

\r\n

ICH Q3C Class 3 - stripping required<\/span><\/p>\r\n<\/td>\r\n

\r\n

ICH Q3C Class 1 - known carcinogen limits apply<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

Operator toxicity<\/span><\/p>\r\n<\/td>\r\n

\r\n

Non-toxic - asphyxiation risk only at very high concentrations (standard ventilation adequate)<\/span><\/p>\r\n<\/td>\r\n

\r\n

Low\u2013moderate (ethanol vapour)<\/span><\/p>\r\n<\/td>\r\n

\r\n

Moderate\u2013high (hydrocarbon vapour, narcotic effects)<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

Regulatory status (food\/pharma)<\/span><\/p>\r\n<\/td>\r\n

\r\n

GRAS certified; ICH Q3C exempt - no residue limit in pharma products<\/span><\/p>\r\n<\/td>\r\n

\r\n

ICH Q3C Class 3 - daily exposure limits apply<\/span><\/p>\r\n<\/td>\r\n

\r\n

ICH Q3C Class 1 - to be avoided in pharmaceuticals<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

Organic certification<\/span><\/p>\r\n<\/td>\r\n

\r\n

Supercritical CO2 extraction process: EU 2018\/848, USDA NOP, JAS, NPOP compatible<\/span><\/p>\r\n<\/td>\r\n

\r\n

Not compatible (hexane) \/ limited (ethanol)<\/span><\/p>\r\n<\/td>\r\n

\r\n

Not compatible<\/span><\/p>\r\n<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n

The 4 Types of CO2 Extraction Approach Explained<\/b><\/h3>\r\n

Types of Extraction Methods Using CO2<\/b><\/h3>\r\n