A solvent is a substance that can dissolve other substances (solutes) to form a solution. Solvents are predominantly liquid (ethanol, water, acetone, and methanol) but can also be gas (hexane, butane, or hexane) or in a supercritical state, such as Carbon Dioxide. Factors that affect solubility are temperature, pressure, and the nature of the soluble and solvent.
There are two types of solvents: polar and nonpolar
Polar: These types of solvents have atoms with positive and negative charges at the end of the molecules that attract positive and negative charges from the solutes. The solutes are dissolved when pulled into different parts by the solvent’s electrical charge. Examples of polar solvents include water, acetone, methanol, and isopropanol.
Non-polar: These have electrons that are evenly distributed along the molecule. This is as opposed to polar solvents whose atoms are located at the end of the molecules. Non-polar solvent molecules attract non-polar solutes to form a solution. Examples include benzene, CO2, pentane, hexane, and xylene.
Cannabis extraction techniques break down the flower and extract phytochemicals like cannabinoids, terpenes, essential oils, and others. The most commonly used cannabis extraction solvents are ethanol and CO2. Water is also a viable solvent used to create bubble hash, aka solventless concentrate.
CO2 Cannabis Extraction
Most extracting companies prefer the CO2 extraction technique as it tends to produce a pure, potent, and huge yield. The solvent is used in the extraction of terpenes and cannabinoids. It easily evaporates and poses no fire threat since it is non-combustible. The only issue with this technique is that it requires expensive equipment and expertise to operate.
Ethanol extraction
Ethanol extraction involves soaking cannabis plant material (flowers, stems, or leaves) in ethanol to create a potent botanical extract. Since the technique is non-specific, the end product will have waxes, fats, and chlorophyll. The solution then undergoes distillation to remove any solvent residues and winterization to eliminate the fats and waxes. When not done correctly, this technique may produce a concentrate with impurities, making it unsuitable for human consumption.
Always ensure you purchase concentrates from a reputable, licensed dispensary that provides 3rd party reports. This will prevent you from consuming products that may affect your health.