{"column":{"component":"Media","content":{"media":{"src":{"mobile":"/media/yswfrjph/perfume-production.jpg?width=668\u0026height=0\u0026format=webp\u0026v=1db7309b756a390","tablet":"/media/yswfrjph/perfume-production.jpg?width=1145\u0026height=0\u0026format=webp\u0026v=1db7309b756a390","desktop":"/media/yswfrjph/perfume-production.jpg?width=1642\u0026height=0\u0026format=webp\u0026v=1db7309b756a390"},"alt":"Flow control in perfume extraction process","type":"image","link":{},"width":668,"height":0},"caption":""}}}
The role of supercritical CO2 in extraction
Supercritical CO2 (carbon dioxide) is a powerful alternative to traditional volatile organic solvents. When CO2 is in its supercritical state—above 31°C and 73 bars—it exhibits unique properties of both liquids and gases. This makes it an excellent solvent with high diffusivity, ideal for extracting essential oils, aromas, and perfumes from natural products without denaturation.
Application requirements
Control of the supercritical CO2 flow and temperature allows selective and accurate extraction of compounds from the raw material. Without a flow meter, analysis would be based on theoretical flow curves with an accuracy of approx. 20%, which does not allow for repeatable successive extractions in terms of production yield. Knowing the precise mass flow of CO2 passing through the raw material guarantees repeatable yields. So, such a flow meter is needed. Moreover, the extraction process needs to be conducted in an automated way.
Important topics
Important topics
Accuracy & repeatability.
Automation/control.
Versatility - able to monitor temperature and density.
Service & support.
Process solution
The Bronkhorst solution includes two Coriolis-based mass flow meters: the mini CORI-FLOW M15 series for industrial equipment and the mini CORI-FLOW M14 for laboratory equipment. These flow meters use the Modbus protocol to communicate with the rest of equipment.
SFE Process’ standard industrial equipment operates at pressures up to 400 bars and 100°C, while laboratory equipment can handle pressures up to 1000 bars. The mass flow meters are installed before the pump that applies high pressure to the extractor.
In the supercritical CO2 extraction process, natural raw materials are placed in a container within the extraction unit. A pump circulates CO2 in a supercritical state, dissolving selected compounds. By adjusting temperature and pressure, specific compounds can be extracted. After extraction, the pressure is reduced to separate the gaseous CO2 from the extracted compounds. The CO2 is then recovered for reuse in subsequent cycles. Multiple compounds can be extracted in one cycle and collected in separate vessels as liquids or solids.
Typical raw materials include flowers and wood, but the equipment can also remove organic solvents from plastic waste for recycling. SFE Process’ equipment supports automatic extraction with pre-recorded recipes that can be customized based on the raw materials and desired compounds. The flow meter ensures accurate CO2 flow measurement and continuous control for optimal extraction, providing crucial data for analyzing extraction efficiency.
Additionally, the flow meter measures the temperature and density of the CO2 to ensure it is in a liquid state before pumping. Adjustments can be made as needed, such as changing heat exchanger or pump settings.
Real-time extraction control and monitoring enhance production quality, saving time and money while improving the process.
"We are completely satisfied with the Bronkhorst flow instruments, and with their service and support."
- SFE Process
Recommended products
mini CORI-FLOW
Coriolis mass flow meter for liquids & gases with controller output
For 0...300 kg/h
Accuracy *****
Best dosing solution by on-board controller
Suitable for any fluid
View range
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