Cannabinoid Purification via Selective Solvent Crystallization
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Solution Overview
Problem
Current methods for purifying cannabinoids from Cannabis plants face challenges in achieving high purity and yield, often resulting in low bioavailability and contamination with other compounds due to the use of non-selective solvents and inefficient crystallization processes.
Innovation Solution
A method involving the use of solvents such as N,N-dimethylacetamide, N,N-dimethylformamide, and tetrahydrofuran to extract and purify cannabinoids by maintaining the solution at controlled temperatures, allowing for the crystallization and subsequent removal of solvents to achieve high-purity cannabinoids, with the option to decarboxylate the cannabinoids for further processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional extraction and purification methods are used, then cannabinoids can be isolated from Cannabis plants, but the purity and yield are low due to non-selective solvents and inefficient crystallization processes
Solution Approach 1:
The patent applies parameter changes by systematically optimizing temperature, solvent composition, and pH conditions during extraction and crystallization. Specifically, the method uses temperature gradients (cooling from room temperature to -20°C or lower) and adjusts solvent ratios to control cannabinoid solubility and selective crystallization, thereby achieving both high purity and high yield simultaneously
Solution Approach 2:
The patent utilizes phase transitions through controlled crystallization processes. By cooling the extract solution and adjusting solvent composition, cannabinoids transition from dissolved state to crystalline solid form. This phase transition enables selective separation of target cannabinoids from the mixture, resolving the contradiction between purity and yield
2Ease of manufacture
If non-selective solvents are used for extraction, then the extraction process is simple, but the resulting extract contains contamination with other compounds
Solution Approach 1:
The patent introduces selective solvent systems as intermediaries between the crude plant material and final cannabinoid product. Specific solvent combinations (e.g., ethanol-water, ethyl acetate-hexane) act as mediators that selectively dissolve target cannabinoids while leaving contaminants behind, or selectively precipitate cannabinoids from the extract, thereby achieving high purity without sacrificing process simplicity
Solution Approach 2:
The patent applies segmentation by dividing the extraction and purification process into distinct stages: initial extraction with a first solvent system, filtration to remove plant material, and selective crystallization with a second solvent system. This segmented approach maintains simplicity at each stage while achieving cumulative purification效果
3Reliability
If conventional purification methods are used, then some cannabinoids can be obtained, but bioavailability is low due to impurities and incomplete purification
Solution Approach 1:
The patent replaces complex mechanical purification systems (such as multiple chromatography columns, centrifugation equipment, and filtration systems) with a simplified chemical purification approach using selective solvent crystallization. This substitution achieves high purity cannabinoids with improved bioavailability while reducing equipment complexity and operational complexity
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 method achieves cannabinoids with purities of at least 95%, improving bioavailability and reducing solvent usage, while allowing for controlled crystal growth and high yields, surpassing the limitations of existing methods by providing a more selective and efficient purification process.
Implementation Method 1
maintaining the solution at a temperature between −40° C. to 25° C. for a time sufficient to obtain solid cannabinoid
Implementation Method 2
removing the one or more solvents to obtain pure cannabinoid
Data Source
AI summary
The present disclosure is generally directed to methods for purifying cannabinoids from Cannabis plants.