Continuous Extraction System with Solvent Recycling and Drying
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing extraction processes are not cost-effective, energy-efficient, and lack continuous operation capabilities, particularly in retaining and recycling solvents during the extraction of organic components from plant materials.
Innovation Solution
A continuous extraction system with multiple chambers that allows for the continuous removal of the desired product, recycling of the solvent, and drying of the extracted material, while maintaining nearly all solvent within the system, using a separation chamber for solvent vaporization and condensation, and a heat exchanger to minimize energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a batch extraction process is used with a single extractor, then the equipment is simple and easy to operate, but the process cannot achieve continuous operation and solvent recycling efficiency is low
Solution Approach 1:
The extraction system is divided into multiple independent extraction chambers (first extraction chamber, second extraction chamber, etc.) that can operate simultaneously. Each chamber is equipped with its own solvent inlet and outlet, allowing continuous extraction while one chamber is being processed and another is being prepared or emptied, thereby achieving continuous operation without proportionally increasing overall system complexity
Solution Approach 2:
The system maintains continuous extraction by having multiple chambers in different operational stages simultaneously. While one chamber completes extraction and is being emptied, another chamber is already in the extraction phase, ensuring that the extraction process never stops. The solvent circulation system continuously recycles solvent between chambers and the condenser, maintaining uninterrupted useful action
2Quantity of substance
If solvent is removed and evaporated to isolate the extract, then the product is obtained in concentrated form, but significant energy is consumed and solvent loss occurs
Solution Approach 1:
The system utilizes phase transitions of the solvent (liquid to vapor in the condenser, then vapor back to liquid) to separate and concentrate the extract. The solvent vaporizes selectively based on its volatility, leaving the non-volatile extract behind in concentrated form. This phase transition mechanism achieves concentration without requiring excessive energy input, as the solvent naturally cycles through phase changes driven by the system's pressure and temperature gradients
Solution Approach 2:
The system changes pressure and temperature parameters to control solvent evaporation and condensation. By adjusting the pressure in the condenser and the temperature of the heating elements, the system optimizes the evaporation rate and condensation efficiency, achieving extract concentration while minimizing energy consumption and preventing solvent loss through controlled parameter variations
3Ease of operation
If the evaporator is used as the receiver for extract and pressure is dropped to zero psig, then the extract can be drained, but the process requires halting extraction and involves complex pressure control
Solution Approach 1:
The system separates the extraction function from the collection function by having dedicated extraction chambers that remain under positive pressure for continuous extraction, while the condenser operates under vacuum or reduced pressure for extract collection. This segmentation allows extract removal in the condenser without interrupting the extraction process in the chambers, eliminating process interruptions and time loss
Solution Approach 2:
The condenser acts as an intermediary between the extraction chambers and the final extract collection. It receives solvent vapor and extract from the chambers, separates them through condensation, and collects the concentrated extract while allowing continuous solvent recycling. This intermediary mechanism enables extract removal without halting the main extraction process
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 achieves efficient solvent recycling, minimizes energy consumption, and allows for continuous operation with minimal solvent loss, enabling the isolation of the product in a concentrated form and safe disposal of spent plant material.
Implementation Method 1
a separation chamber, which is an expansion chamber, where a solvent from a solution is vaporized, with the formation of an aerosol from one or more solutes that consolidates into an extract
Implementation Method 2
a heat exchanger to minimize energy consumption
Data Source
AI summary
Continuous extraction units are constructed having a plurality of extraction chambers containing extractable material. Without disruption of total fluid flow in the unit: an extraction chamber completely depleted of extract can be evacuated of solvent and replaced with an extraction chamber containing fresh extractable material. The extract is continuously separated from the solvent in an expansion chamber where it is continuously or periodically removed from the unit. All solvent can be retained within the unit. One or more compressors can be used to circulate the fluid through the extraction chambers, the expansion chamber, and a condenser, where the expansion chamber and the condenser can be coupled as a heat exchanger.