Method of preparing delta-9 tetrahydrocannabinol

C - Chemistry – Metallurgy – 07 – D

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C07D 311/80 (2006.01)

Patent

CA 2469490

A method for the isolation of delta-9-tetrahydrocannibinol (THC) from Cannabis plant material, wherein delta-9-THC Acid and THC are separately obtained comprising the steps of extracting the Cannabis plant material, chelating delta-9-THC acid on alumina solid support from cannabis extracts rich in the acid washing of non-acid washing of non-acid components of the extract with organic solvents and eluting of the delta-9-THC acid with strong polar solvents. MThe method also includes a process by which to increase the THC content and decrease the weight of Cannabis extracts or residue from distillation of Cannabis extracts containing a low concentration of THC, comprising treatment of such materials with watermissible organic solvents followed by filtration and evaporation of the solvent to obtain the concentrated residue.

L'invention concerne un procédé permettant l'isolement de delta-9-tétrahydrocannibinol (THC) à partir de matières végétales de cannabis. Ce procédé permet une obtention séparée d'acide delta-9-THC et de THC, et comprend les étapes consistant à extraire les matières végétales de cannabis, à provoquer la chélation de l'acide delta-9-THC sur un support d'alumine solide à partir d'extraits de cannabis présentant des concentrations élevées de cet acide, à séparer les composant non acides de l'extrait par un lavage au moyen de solvants organiques, et à éluer l'acide delta-9-THC au moyen de solvants polaires puissants. Le procédé décrit comprend en outre un processus permettant d'augmenter la teneur en THC et de réduire le poids des extraits de cannabis ou des résidus de distillation d'extraits de cannabis contenant une faible concentration en THC. Ce processus comprend le traitement de ces matières avec des solvants organiques miscibles à l'eau suivi d'une filtration et d'une évaporation du solvant, afin d'obtenir le résidu concentré.

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