Treatment of Cannabis Extracts with Methanolic KOH Solution 70 THC Oil

Direct Treatment of Cannabis Extracts with Methanolic KOH Solution 70% THC Oil 

28 g of the heptane extract (THC content 41.4%) was sonicated very well with 50 mL. of 0.25 N KOH in methanol and filtered. The precipitate weighed 1 g (most probably hydrocarbons). The filtrate was acidified with 15 mL. of 1 N HCl and extracted twice with hexane (100 mL. X 2) to give 3.18 g residue (THC content 70.02%), with almost quantitative recovery. 

Reprocessing of the Residue Left After Fractional Distillation of Cannabis Extracts 82% THC Yellow Oil 

34 g of marijuana extract containing 55% of THC was distilled under vacuum (0.3 mmHg) and the distillate at 174-192° C. was collected to give 17.8 g of pale yellow oil that contained 82% THC. 

The residue remaining in the distillation flask was cooled to room temperature and weighed 15.7 g which analyzed for 25% THC. This was triturated with 50 mL. of methanol and filtered. The filter cake was triturated with another 50 mL of methanol and filtered. The filtrates were combined and evaporated to give 7.04 g of oil which analyzed for 55% THC (98% recovery). Source Elsohly 2002 

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