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Cannabis

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Patent US0210171354


Issued

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Classification


Slightly Less than Average Length Specification


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USPTO Full Text Publication >

15 Independent Claims

  • Independent Claim 2. The process of claim 1, wherein: the activating agent is KOH, H.sub.3PO.sub.4 or ZnCl.sub.2and the spent cannabis biomass is mixed with the activating agent at a ratio of between 1:0.5 and 1:3 by weight.

  • Independent Claim 3. The process of claim 1, wherein the activating agent is mixed with the spent cannabis biomass for 2 to 24 hours.

  • Independent Claim 4. The process of claim 1, wherein: the impregnated spent cannabis biomass is maintained at the third temperature for 0.5 to 2 hoursand the third temperature is between 500 and 900.degree. C.

  • Independent Claim 5. The process of claim 1, wherein the first temperature is 100.+-.20.degree. C. and the second temperature is 170-500.degree. C.

  • Independent Claim 7. The process of claim 1, wherein the impregnated spent cannabis biomass is heated in a fixed bed reactor that has an exhaust line with a bypassable cold trap, the process comprising purging the fixed bed reactor with nitrogen before heating the impregnated spent cannabis biomass.

  • Independent Claim 10. The process of claim 1, comprising collecting the recovered cannabinoids by directing them into chilled ethanol.

  • Independent Claim 11. The process of claim 1, comprising collecting the recovered cannabinoids by directing them onto a high surface area condenser.

  • Independent Claim 12. The process of claim 1, comprising maintaining the impregnated spent cannabis biomass at the first temperature until all the water is removed from the impregnated spent cannabis biomass.

  • Independent Claim 13. The process of claim 1, comprising collecting water and volatile components from the impregnated spent cannabis biomass using a cold trap, while the impregnated spent cannabis biomass is below and at the first temperature.

  • Independent Claim 14. The process of claim 1, comprising maintaining the impregnated spent cannabis biomass at the second temperature until all the cannabinoids have been recovered from the impregnated spent cannabis biomass.

  • Independent Claim 15. The process of claim 1, comprising maintaining the impregnated spent cannabis biomass at the third temperature for 1 hour.

  • Independent Claim 16. The process of claim 1, comprising passing nitrogen gas over the impregnated spent cannabis biomass throughout the process.

  • Independent Claim 17. The process of claim 1, comprising milling the spent cannabis biomass to an average particle size below 2 mm prior to mixing the spent cannabis biomass with the activating agent.

  • Independent Claim 18. The process of claim 1, comprising washing the activated carbon with hot deionized water when the activating agent is acidic.

  • Independent Claim 19. The process of claim 1, comprising washing the activated carbon with a diluted HCl solution and then washing the activated carbon with deionized water, when the activating agent is alkaline.