Hemp oil is extracted from CBD rich parts of hemp plants. There is a multitude of options in the methods used to extract essential cannabinoids out of hemp. Extraction is generally the initial step in CBD oil manufacture that produces crude CBD oil as the end product. It has to undergo further processing like purification and cannabinoid isolation to reach the final processed state. The most commonly employed extraction method of hemp oil is CO2 extraction that guarantees a high level of purity of the oil. In this article, we are focusing on the purification procedure of hemp oil derived by employing CO2 extraction.
What Is Supercritical CO2 Extraction Of CBD Oil?
Supercritical CO2 extraction uses CO2 in a supercritical state (between liquid and gas) to pull out the essential cannabinoids from hemp. In the process, gaseous carbon dioxide is initially converted into a liquid by subjecting it to high pressure and low temperature. The liquid CO2 then converts to supercritical state in the extraction equipment when pressure and temperature are increased to the right levels.
How To Purify Crude CBD Oil?
Crude CBD oil extracted using supercritical CO2 will contain unwanted compounds like fats and waxes; as the extreme pressure generally pulls out everything from hemp. The fats and waxes are undesirable in the final products and hence have to be removed. Two crucial steps in purification of hemp oil extract are:
Winterization is a simple purification process that does not involve complicated apparatus or processing. In the process, crude CBD oil is mixed with 200 proof alcohol and kept in the freezer for 24 hours to purify hemp oil. During its refrigeration period, the alcohol-oil mixture turns cloudy. The waxes and fats can be easily filtered out by passing the mixture through a filter paper of appropriate porous size. Later on, the alcohol solvent has to be removed from it. As the boiling point of alcohol is lower than that of CBD oil, it can be easily removed by heating the mixture to the boiling point of alcohol.
Short Path Distillation
The hemp oil extracted using supercritical CO2 will contain all essential phytochemicals in hemp. If you want to isolate each of the compounds separately, short path distillation can be employed. The process involves heating of the hemp oil to the boiling points of each cannabinoid to extract them separately. The step is crucial in making broad-spectrum CBD oil and isolates CBD oil.
The efficacy of the purification steps of hemp oil decides the overall benefits it will offer.