THCA Crystal Purification via Solvent Vapor Equilibrium
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Solution Overview
Problem
Traditional recrystallization methods for cannabinoids are limited by the need for multiple passes, which lead to crystal loss and impurity accumulation, and do not effectively utilize solvent vapor for purification.
Innovation Solution
The method employs dynamic equilibrium recrystallization using solvent vapor, where a hydrocarbon solvent is used to create a vapor/liquid film that allows for single-pass crystal rearrangement and purification, with impurities being removed by gravity, while the cannabinoid acid forms are incorporated into the crystals, increasing their purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional recrystallization methods are used, then purification can be achieved, but multiple passes are required leading to crystal loss and impurity accumulation
Solution Approach 1:
The patent utilizes phase transitions of solvent between vapor and liquid states to achieve purification. The solvent is heated to generate vapor that selectively dissolves impurities from the crystal surface, then condenses back to liquid to be removed. This cyclic phase transition enables continuous purification in a single pass without losing the crystallized compound.
Solution Approach 2:
The invention employs pneumatic principles by using solvent vapor (gas phase) to interact with the crystals. The vapor phase solvent selectively dissolves impurities through mass transfer, and the system uses pressure control and condensation to manage the vapor-liquid equilibrium, enabling efficient impurity removal without mechanical handling that could cause crystal loss.
2Manufacturing precision
If traditional recrystallization methods are used, then purification can be achieved, but time required is increased due to multiple passes
Solution Approach 1:
The patent implements continuous purification by maintaining a continuous flow of solvent vapor over the crystals. The vapor continuously dissolves impurities that migrate to the crystal surface, and the system operates in a continuous cyclic manner rather than discrete batch steps, achieving high purity in a single continuous operation rather than multiple sequential passes.
Solution Approach 2:
The rapid phase transitions between vapor and liquid states enable quick impurity removal cycles. The solvent quickly vaporizes to attack impurities, then rapidly condenses to be removed, creating efficient short-cycle purification that reduces total processing time compared to traditional slow recrystallization methods.
3Loss of substance
If solvent vapor is used for purification, then crystal loss is minimized, but the mechanism for impurity removal must be effective
Solution Approach 1:
The patent applies local quality by creating a vapor-liquid film specifically at the crystal surface where impurities are located. The solvent vapor condenses into a thin liquid film that selectively contacts and dissolves impurities on the crystal surface, while the bulk crystals remain undisturbed. This localized action ensures efficient impurity removal without dissolving or losing the crystallized compound.
Solution Approach 2:
The solvent vapor acts as an intermediary medium that facilitates impurity removal without directly contacting and potentially damaging the crystals. The vapor phase solvent molecules selectively interact with impurity molecules on the crystal surface, transferring them to the vapor phase or dissolving them in the condensed liquid film, which is then removed, leaving purified crystals intact.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the time required for purification, minimizes crystal loss, and achieves higher purity in a single recrystallization step by leveraging the solubility of impurities in solvent vapor, allowing for efficient removal of impurities without re-dissolving the crystals.
Implementation Method 1
a hydrocarbon solvent is used to create a vapor/liquid film that allows for single-pass crystal rearrangement and purification
Implementation Method 2
The reaction vessel is heated and then the heating is discontinued. Vapor/thin-film DER is promoted in the reaction vessel
Implementation Method 3
with impurities being removed by gravity
Implementation Method 4
The reaction vessel is heated and then the heating is discontinued. Vapor/thin-film DER is promoted in the reaction vessel for a predetermined length of time
Data Source
AI summary
A Reflux Rinsing method for purifying crystals using solvent vapor through dynamic equilibrium recrystallization. Feed material having tetrahydrocannabinol acid (THCA) is inserted into a reaction vessel having walls, and upper portion, and a lower portion with a bottom surface. The feed material is exposed to a hydrocarbon liquid in the reaction vessel in a quantity sufficient to keep liquid present in equilibrium with gas in the reaction vessel through the recrystallization process, forming a raw extract having THCA. The walls and bottom surface of the reaction vessel are coated with raw extract. The reaction vessel is heated and then the heating is discontinued. Vapor/thin-film DER is promoted in the reaction vessel for a predetermined length of time with no solvent reflux, resulting in formation of purified crystals of THCA under pressure. The hydrocarbon solvent is reclaimed from the reaction vessel, leaving the purified crystals and impurities. When the reaction vessel is opened, the purified crystals and impurities are removed.