Supercritical Fluid Extraction of Halocarbon Anaesthetics
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Solution Overview
Problem
Current methods for capturing and re-manufacturing halocarbon volatile anaesthetic agents are inefficient, leading to environmental contamination and high costs due to the use of expensive pressure-tolerant canisters and the inability to recycle activated charcoal canisters, which also release anaesthetic agents slowly after disposal, contributing to ozone depletion and greenhouse gas emissions.
Innovation Solution
A system using a pressure-intolerant sleeve containing filter material for capturing halocarbons, which is then inserted into a pressure-tolerant housing for supercritical fluid extraction, along with a method for recycling carbon dioxide and using it for chromatography, allowing for the efficient separation and purification of halocarbons, reducing material costs and environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure-tolerant canisters are used for capturing and storing halocarbon anaesthetic agents, then the reliability and containment effectiveness are improved, but the manufacturing cost and device complexity increase significantly
Solution Approach 1:
The system divides the containment function into two separate components: a pressure-intolerant capture canister for adsorbing halocarbons at atmospheric pressure, and a pressure-tolerant extraction vessel for subsequent supercritical fluid extraction. This segmentation allows each component to be optimized for its specific function, reducing overall system cost while maintaining reliability.
Solution Approach 2:
The patent introduces an intermediary transfer process where halocarbons captured in the pressure-intolerant canister are transferred to the pressure-tolerant extraction vessel using a transfer line and valve system. This intermediary mechanism allows the use of cheaper pressure-intolerant canisters for capture while still achieving reliable containment and extraction through the combined system.
2Reliability
If activated charcoal is used for capturing halocarbon anaesthetic agents, then the capture effectiveness is improved, but the environmental harm and loss of substance worsen due to slow release after disposal
Solution Approach 1:
The system enables recovery of halocarbon anaesthetic agents from the activated charcoal through supercritical fluid extraction, transforming the previously discarded waste stream into a recoverable resource. The extracted halocarbons are purified and returned to clinical use, preventing environmental release while maintaining capture effectiveness.
Solution Approach 2:
The patent changes the physical parameters (temperature and pressure) to supercritical conditions during the extraction process, enabling efficient desorption of halocarbons from the activated charcoal. This parameter change transforms the adsorption process into a reversible extraction process, allowing complete recovery and eliminating environmental harm.
3Manufacturing precision
If supercritical fluid extraction is used for separating and purifying halocarbons, then the manufacturing precision and purity are improved, but the use of energy and device complexity increase
Solution Approach 1:
The system utilizes phase transitions of carbon dioxide between supercritical and gaseous states to achieve purification. By controlling pressure and temperature, CO2 transitions to a supercritical state for extraction, then returns to gaseous state for easy separation from the purified halocarbons. This phase transition mechanism provides high purification quality while requiring energy only during the phase change cycles.
Solution Approach 2:
The patent replaces traditional mechanical separation methods with supercritical fluid extraction, which uses solubility differences in the supercritical state for separation. This substitution achieves higher purification precision while potentially reducing overall energy consumption by eliminating multiple mechanical separation steps.
4Device complexity
If traditional capture and disposal methods are used for halocarbon anaesthetic agents, then the device complexity is reduced, but the loss of substance and environmental harm worsen due to inability to recycle
Solution Approach 1:
The system implements a recovery loop where halocarbon anaesthetic agents captured from waste streams are extracted, purified, and returned to clinical use. This closes the material cycle, preventing substance loss and eliminating the need for continuous purchase of new agents, while the added complexity is justified by the environmental and economic benefits.
Solution Approach 2:
The system enables self-service by capturing and recovering halocarbons that would otherwise be wasted, making the system self-sustaining. The recovered agents are reused in clinical practice, reducing dependency on external supplies and minimizing environmental impact without requiring complex external intervention.
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 system effectively captures and re-manufactures halocarbon anaesthetic agents, reducing waste, lowering costs, and minimizing environmental harm by utilizing cost-effective materials and recycling processes, while ensuring compliance with regulatory standards.
Implementation Method 1
passing waste gas from an anaesthetic machine through filter material to capture halocarbon anaesthetic agents
Implementation Method 2
subjecting the filter material to supercritical carbon dioxide to extract the halocarbons
Implementation Method 3
separating the halocarbons from the carbon dioxide by fractional distillation
Implementation Method 4
recycling the carbon dioxide for use in subsequent extractions
Data Source
AI summary
An anaesthetic halocarbon capture system is provided. The system includes a pressure-intolerant sleeve containing filter material for capturing one or more types of anaesthetic halocarbon prior to supercritical fluid extraction, and a pressure-tolerant housing into which the sleeve can be inserted so as to permit exposure of the sleeve contents to pressures required for supercritical fluid extraction.