Supercritical CO2 Extraction of Cellulosic Constituents
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Solution Overview
Problem
Current methods for extracting and isolating constituents from cellulosic materials, such as tobacco, face challenges in selectively isolating compounds with similar boiling points and vapor pressures, often resulting in contamination with undesirable substances like nitrosamines and nicotine, which are time-consuming and costly to rectify.
Innovation Solution
A process involving supercritical extraction followed by distillation to isolate constituents from cellulosic materials, using a non-toxic and environmentally friendly supercritical fluid like carbon dioxide, allowing for the selective separation of compounds with similar physical properties without the need for additional solvent removal or toxic separation matrices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional extraction methods are used to isolate constituents from cellulosic material, then extraction can be achieved, but contamination with undesirable substances like nitrosamines and nicotine occurs and additional separation steps are required
Solution Approach 1:
The patent extracts only the desirable constituents (flavourants and aroma compounds) from cellulosic material using supercritical carbon dioxide, leaving undesirable substances like nitrosamines and nicotine behind in the residue. This selective extraction eliminates the need for additional separation steps to remove contaminants.
Solution Approach 2:
The patent utilizes supercritical fluid extraction where carbon dioxide is brought to supercritical conditions (temperature above 31.1°C and pressure above 73.8 atm) to achieve selective solubility. By controlling temperature and pressure parameters, the extraction process selectively dissolves desirable constituents while leaving undesirable substances behind, achieving high purity in a single step.
2Productivity
If supercritical extraction is used to extract constituents, then extraction efficiency is improved, but selective isolation of compounds with similar boiling points remains challenging
Solution Approach 1:
The patent uses supercritical carbon dioxide as an intermediary medium that selectively dissolves desirable constituents based on their solubility characteristics rather than boiling points. This intermediary approach allows efficient extraction while maintaining selectivity, as the supercritical fluid can be tuned to preferentially dissolve specific compound classes while leaving others behind.
3Manufacturing precision
If additional solvent removal steps are implemented to reduce contamination, then purity of constituents is improved, but processing time and cost increase
Solution Approach 1:
The patent takes out only the desirable constituents in a highly selective manner using supercritical carbon dioxide, so that the extract contains minimal undesirable substances from the start. This eliminates the need for time-consuming additional purification steps, as the selective extraction itself achieves the required purity.
Solution Approach 2:
The patent discards the undesirable substances (nitrosamines, nicotine, and other non-extractable components) in the residue left after supercritical extraction, while recovering the desirable constituents in the extract. This single-step separation achieves high purity without requiring multiple processing cycles.
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 enables the efficient and cost-effective isolation of pure constituents with high controllability, minimizing contamination by undesirable substances like nitrosamines and nicotine, and reducing the environmental impact of the extraction process.
Implementation Method 1
contacting the cellulosic material with a supercritical fluid under conditions to provide an extract
Implementation Method 2
separation of at least one of the constituents present in the extraction medium by distillation
Data Source
AI summary
A method for extracting and isolating constituents of cellulosic matter, comprising providing cellulosic matter; contacting the cellulosic matter with a supercritical fluid; separating the supercritical fluid from the cellulosic matter, thereby forming an extract and a raffinate; and separating at least one compound present in the extraction medium by distillation.