WO2019090428A1 – May 16, 2019 – CLOSED LOOP CHILLED SOLVENT FEED FOR CANNABINOID EXTRACTION

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Inventors :

KO, Ryan Delmoral - c/o NextLeaf Solutions Ltd, 3-68 Schooner St, Coquitlam, British Columbia V3K 7B1

Owner :

NEXTLEAF SOLUTIONS LTD

Application Number :

WOCA18051416

Document Number :

WO2019090428A1

Priority Date :

January 1, 1970

Filing Date :

November 8, 2018

Date of Grant/ Publication :

May 16, 2019

Class :

; B01D11 / 02; A23L33 / 105; A61K31 / 05; A61K31 / 352; A61K36 / 185; C07C39 / 23; C07D311 / 80

Abstract

Refrigerated solvent is fed through a cooling jacket around an essential element extraction vessel. After circulating through the cooling jacket, the solvent is re-chilled and at least some of the solvent is passed into the extraction vessel, in which essential elements dissolve into the solvent. Downstream of the extraction vessel, after adsorbent media treatment, the extracted oil and solvent mixture is filtered, in a chilled state, through one or more filtration units. A filtration unit may be a system of vertically oriented filters of decreasing pore size sealed and insulated from the atmosphere. Pressurized gas is used to force the oil and solvent through the filters. Each filter stage has a removable lid, which provides convenient access for replacing the filter cartridge without disturbing the thermally insulated sidewalls of the filter stage.

Claim(s)

1 . A system for feeding chilled solvent through ground cannabis plant material, comprising: a cooling tank for cooling the solvent; an extraction vessel having a cooling jacket and an extraction chamber; a first fluid connection between the cooling tank and the cooling jacket for transferring solvent from the cooling tank to the cooling jacket; a second fluid connection between the cooling jacket and the cooling tank for transferring solvent from the cooling jacket to the cooling tank; and a third fluid connection, between the cooling tank and the extraction chamber, for transferring solvent from the cooling tank to the extraction chamber.;
2. The system of claim 1 , wherein the ground cannabis plant material is in the extraction chamber.;
3. The system of claim 2, comprising a pump in the first fluid connection that acts to pump solvent from the cooling tank to the cooling jacket.;
4. The system of claim 3, comprising a valve in the first fluid connection between the pump and the cooling tank, which acts to control a rate of solvent flow to the cooling jacket.;
5. The system of claim 4, wherein the third fluid connection: comprises a fluid connection from the valve to the extraction chamber; and coincides with the first fluid connection between the cooling tank and the valve.;
6. The system of claim 5, wherein the valve acts to control a rate of solvent flow to the extraction chamber.;
7. The system of claim 1 , comprising a pump in the third fluid connection that acts to pump solvent from the cooling tank to the extraction chamber.;
8. The system of claim 1 , wherein the extraction chamber comprises a centrifuge and a mesh bag inside the centrifuge, wherein the ground cannabis plant material is in the mesh bag.;
9. The system of claim 1 , comprising an adsorbent media treatment vessel downstream of the extraction chamber and a filtration system downstream of the extraction vessel, the filtration system comprising a solvent vessel, a plurality of filter stages and the same plurality of transfer tubes wherein each filter stage has: a thermally insulated cylindrical side wall; a lid that is removable from said wall; a replaceable, elongated filter cartridge; an inlet port in the lid located to introduce the solvent into the filter cartridge; and a base with an outlet port that drains the solvent from outside the filter cartridge; the solvent vessel has: a thermally insulated side wall; an inlet port configured for introducing pressurized gas; and an outlet tube having a first end located at a bottom region of the solvent vessel and a second end located outside the solvent vessel; and the transfer tubes are each removably connected: at an outlet end thereof to one of the inlet ports in one of the lids of the filter stages; and at an inlet end thereof to either the second end of the outlet tube of the solvent vessel or the outlet port of another of said filter stages such that the solvent vessel and the filter stages are connected in series.;
10. The system of claim 9, wherein the solvent vessel is a cryofreezer tank.

Summary

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