Cannabidiol Purification via Crystallization and Complexation
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Solution Overview
Problem
Current methods for producing cannabidiol often result in the presence of undesirable impurities, such as heavy metals and toxins, which make it difficult to meet food and drug regulations, especially when produced synthetically or isolated from natural sources.
Innovation Solution
A method involving a continuous or semi-continuous process that includes forming crude cannabidiol through a reaction of (+)-menthadienol and olivetol with a Lewis Acid catalyst, followed by an aqueous alkaline wash, complexation with an amine compound, and crystallization to produce a substantially pure product, free of harmful impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If cannabidiol is isolated from natural sources or produced by conventional synthetic methods, then large quantities of cannabidiol can be produced, but undesirable impurities such as heavy metals and toxins are present
Solution Approach 1:
The patent employs multiple extraction and separation techniques to remove impurities from the cannabidiol product. This includes aqueous alkaline washes to remove acidic impurities, silicic acid adsorption to remove basic impurities, and recrystallization to remove neutral impurities, thereby extracting only the desired cannabidiol while leaving harmful substances behind
Solution Approach 2:
The patent systematically changes physical and chemical parameters throughout the purification process. Temperature is varied during recrystallization to control solubility and selectivity. pH is adjusted during aqueous washes to selectively dissolve or precipitate different impurity classes. Solvent composition is modified to optimize selective solubility of cannabidiol versus impurities at different stages
2Productivity
If current synthetic methods are used to produce cannabidiol, then substantial quantities can be obtained, but the product contains impurities that inhibit ability to sell under food/drug regulations
Solution Approach 1:
The patent divides the purification process into multiple discrete sequential stages, each targeting specific types of impurities. The synthesis and purification are segmented into distinct operational steps with intermediate isolation and characterization points, allowing systematic removal of different impurity classes while maintaining production continuity
Solution Approach 2:
The patent employs composite purification strategies combining multiple different purification mechanisms in sequence. This includes combining chemical extraction (aqueous washes), adsorption (silicic acid), and crystallization methods to create a composite purification system that addresses the full spectrum of potential impurities, ensuring regulatory compliance
3Manufacturing precision
If purification steps are added to remove impurities, then product purity increases, but manufacturing complexity and cost increase
Solution Approach 1:
The patent utilizes phase transitions, particularly crystallization and precipitation, as the core purification mechanism. By controlling temperature and solvent conditions, cannabidiol selectively transitions from dissolved to crystalline phase, leaving impurities in the mother liquor. This physical phase change provides inherent separation without requiring complex equipment
Solution Approach 2:
The patent achieves purification through systematic parameter changes rather than complex equipment. Temperature gradients during cooling crystallization, pH adjustments during washes, and solvent composition changes provide selective separation based on differential solubility and reactivity, simplifying the overall process design
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
The method effectively produces substantially pure cannabidiol that meets regulatory standards, ensuring it is safe for use in pharmaceuticals, cosmetics, and food industries without the need for expensive purification steps, and is recognized as safe in both the US and foreign countries.
Implementation Method 1
forming crude cannabidiol through a reaction of (+)-menthadienol and olivetol with a Lewis Acid catalyst
Implementation Method 2
followed by an aqueous alkaline wash
Implementation Method 3
complexation with an amine compound
Implementation Method 4
and crystallization to produce a substantially pure product
Data Source
AI summary
Disclosed herein are embodiments of a method for making cannabidiol. Also disclosed herein are embodiments of a composition comprising cannabidiol and one or more GRAS components. The method and composition embodiments described herein address the drawbacks associated with conventional methods for making and/or isolating cannabidiol.