Closed-loop system

A cannabis extraction system that uses solvents such as butane or propane to remove oils from cannabis plant material inside a closed system, not open to the outside environment. A closed-loop system can collect solvent used and run it through cannabis material multiple times, allowing for the efficient extraction of specific cannabinoids and terpenes. 

“Closed-loop systems are safer, more efficient, more cost effective, and create higher quality products than open systems.”

What is a closed-loop system?

Closed-loop systems are the norm in solvent cannabis extraction today. Open blasting is a system used in the past that is open to the environment and can lead to explosion and harm; open blasting is a dangerous, outdated technique, and it is not recommended to use. Closed-loop systems are much safer and states in the legal cannabis market require they be used to produce cannabis concentrates. 

Cannabis plant material is put in a closed-loop system with a solvent, such as butane or propane. The solvent strips off the oils of the plant material and produces an extract, which will be further refined to turn into a concentrate.

Closed-loop systems have been used for decades to create perfume and food additives and have recently been adapted for use with cannabis. A closed-loop system offers a safe way to work with flammable hydrocarbons like butane and propane, and it also offers an easy way to use blends of butane, propane, and other chemicals for different extractions. 

Closed-loop systems tend to be expensive to set up but will save money over time, as they have low operating costs and solvents can be reused.