However, these fluids do not offer the same advantages as CO 2 and their use is generally more restricted. Many other substances such as water and small molecules like organic hydrocarbons (propane, butane) can also exist in a critical state though under much different temperature and pressure conditions. In addition, close to the critical point, small changes in pressure or temperature result in significant changes in density, permitting many properties of a supercritical fluid to be altered or “tuned.” SCF CO 2 is also considered a “green” solvent because of its low environmental impact as it is not considered a volatile organic compound (VOC).

This is because an SCF has intermediate properties between more familiar states of matter, and it can diffuse through solids like a low-density gas, but dissolve materials similar to liquid solvents. SCF offers multiple advantages when used for extraction. While there is nothing “super” or even “critical” about such fluids as the name might imply, its unique capabilities under specific process conditions of temperature and pressure make it useful in extraction applications. But there is another less familiar state of matter known as a supercritical fluid (SCF). The solid, known as dry ice, is used for keeping materials cold, while liquid CO 2 must be held under pressure to remain in the liquid state. For carbon dioxide, we are familiar with the invisible gas which we exhale, and as a byproduct of fermentation and combustion. Other chemical compounds such as carbon dioxide can also exist in three states. The most familiar of three states of matter is typically seen in water-ice as solid, water as liquid, and gas or vapor. Furthermore, the use of SFE avoids many potentially serious hazards to personnel while yielding a purer product to the end user. SFE represents a powerful extraction alternative to conventional solvent-based methods yielding cannabis oils with no solvent residue. Although CO 2 is typically thought of as a gas, it can be transformed into a useful and safe extraction solvent through an increase of pressure and temperature. Supercritical fluid extraction (SFE), using carbon dioxide (CO 2), is emerging as a favored method within the cannabis industry. While liquid solvent-based methods are available for the generation of concentrates, traditional liquid solvents such as alcohol or propane gas pose hazards because of their flammable nature. A schematic diagram of a one pass extraction system is described.Īs legalization and demand for medical and recreational cannabis and hemp products increases, the extraction of leaf and bud for preparation of concentrated oils is becoming commonplace. This article describes the nature of supercritical fluids and how they can be used in the cannabis industry. Using commercially available equipment, SFE represents an efficient and safe extraction alternative to conventional solvent extraction yielding cannabis and hemp oils with no solvent residues. Although CO 2 is typically thought of as a gas, or a solid like dry ice, it can be transformed into a useful and safe extraction solvent through the application of mild pressure and temperature increases just above ambient conditions. Supercritical fluid extraction (SFE), using carbon dioxide (CO 2), is emerging as a method of choice within the cannabis industry for preparation of pure products. Further, residual solvent can remain in the end product. While liquid solvents can be used for production of concentrates, traditional solvents such as alcohols or propane gas pose hazards because of their flammable nature. It does not store any personal data.With increasing legalization and demand for medical and recreational cannabis and hemp products, preparation of pure oil concentrates is becoming widespread. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. The cookie is used to store the user consent for the cookies in the category 'Performance'. This cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category 'Necessary'. The cookie is used to store the user consent for the cookies in the category 'Other. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category 'Functional'. The cookie is used to store the user consent for the cookies in the category 'Analytics'. These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly.

Supercritical fluid image