A closed loop extractor is mostly used to extract solvents from the solid substance, especially for cannabis extraction. It is widely used in many fields, such as chemical, metallurgical, food and other industries. The equipment primarily consists of three parts: a solvent tank, a material column and a receiving foundation. Some upgraded versions add a dewaxing column as the fourth part, or equip the material column with a dewaxing structure directly. The closed loop hydrocarbon extraction system is used to conduct a plant extraction in a sealed vacuum system. The closed-loop system can be kept during the plant extraction without exposing any solvent to the air. The butane, propane or the combination of them are generally used as the solvent.

Classifications:

There are several types of closed loop extractors. In terms of ways of solvent injection, closed loop extractors can be classified into the top filled closed loop extractors and the bi-directional closed loop extractors. In terms of ways of solvent movement, closed loop extractors can be classified into the passive closed loop extractors and the active closed loop extractors.

Working Procedures:

1. The closed loop extractor works from its top. The user places the hemp in the top fill inlet, then the solvent washes the hemp in the column of material and then collects the oil as it passes through the material.
2. The solvent containing the oil will be collected into the collection chamber under the column of material.
3. The solvent will evaporate and recycle in the collection chamber and the oil will remain in the collection chamber.

Throughout the process, the vacuum pump provides a vacuum environment and the recovery pump provides pressure.

The accessories of closed loop extractor
01. High pressure food grade hoses: the tube used to transfer liquid phase butane
02. Solvent tank: the container used to contain solvents
03. Product tubes: the tube used to transfer production
04. Collection chamber: the container used to collect oil
05. Recovery pump:used to provide pressure to recover the solvents
06. Material column: the reactor that cannabis gets extracted