Supercritical carbon dioxide is a fluid state of carbon dioxide where it is held at or above its critical temperature and critical pressure.

Carbon dioxide behaves as a gas at ambient temperature and pressure conditions and behaves as a solid when frozen. If the temperature and pressure are increased from ambient conditions to be above the critical point for CO2, it adopts properties between that of a gas and liquid.

More specifically, it behaves as a supercritical fluid above its critical temperature 31.10 °C and critical pressure of 73.9 bar expanding to fill its container like a gas but with a density like that of a liquid.

In this state, carbon dioxide exhibits solvating properties of a liquid and the diffusivity of a gas. This makes it a powerful medium for extraction of natural oils from organic materials.

PROCESS DESCRIPTION


Supercritical Fluid Extraction of solids, is generally operated in batch mode on milled materials (or pellets, granulates), with food grade carbon dioxide as solvent. The equipment consists of two or more extractors operating above the CO2 critical pressure, and two separators where the extract and the CO2 are separated prior to the CO2 being recycled.

The supercritical CO2 extraction process consists of first raising the temperature and pressure of the carbon dioxide gas till it reaches super critical state. This is done using a high pressure pump and a heater. The organic raw material is loaded into the extractors through which the super critical CO2 passes. Based on the components present in the raw materials, and the pressure-temperature settings, the supercritical CO2 extracts the oils from the raw materials and passes through a series of pressure regulator valves to enter the separators. The two separator pressures are controlled individually to separate the different components of the extract. Once the extracted oil is separated from the CO2 which escapes in the form of a gas, the oil is collected in collection vessels while the extract free Carbon dioxide is recycled by condensing and storing in the CO2 tank in the liquid form. This CO2 is then reused and the entire cycle is repeated for the duration of the batch.

BENEFITS

Cost Efficient

Cost Efficient

Faster Process

Faster Process

100% Food Grade

100% Food Grade

Better Stability in Formulation

Better Stability in Formulation

Non-Flammable

Non-Flammable

Minimum Damage to Raw Material

Minimum Damage to Raw Material

Anti-Hydrolysis

Anti-Hydrolysis

Reusability of CO2

Reusability of CO2

Non-Toxic

Non-Toxic

SCFE VS OTHER CONVENTIONAL EXTRACTION TECHNOLOGIES

SCFE Extraction
  • Product free of solvent traces
  • Product free of
  • heavy metal content
  • Product free of inorganic salts
  • Low operating temperatures and selective extraction of CO2 as a solvent ensures extracts resembling actual components

Solvent Extraction
  • Solvent traces present in final product
  • Heavy metal content in final product based on application
  • Inorganic salt content in final product
  • Polar substances get dissolved with certain components of the final product thereby giving final product a different colour and flow characteristics, thereby making it not resemble the actual basic components to be extracted

OUR SYSTEMS

Level 15 / 10 Litre
Level 225 / 50 Litre
Level 3100 / 200 / 500 Litre

FEATURES

SYSTEM TECHNICAL FEATURES
Extractors
  • Quick closure mechanism for easy loading and uploading of biomass
  • Food grade PP bags used to ensure clean operation and homogeneous exposure of material to CO2
  • Stainless steel 316 construction
  • Safety redundancy using codedisensors and fail-safe venting assembly
User Interface
  • Developed keeping in mind latest UI/UX principles for minimizing number of clicks and quick trouble shooting
  • Remote access using android tablet for monitoring the process
  • Dedicated system app on tablet for providing documentation and preventive maintenance push-notifications
CO2 Pump
  • Triplex/Single plunger pump with variable speed
  • Uses flow meter feedback to ensure constant CO2 flowrate through PID
  • Hermetically sealed, diamond coated piston for long life, minimum wear and robust operation
  • Innovative valve technology for ensuring consistent extraction efficiency
Safety System
  • Continuous system monitoring for pressure, temperature, flow-rate, etc
  • Redundant safety sysyem with electronic safety and mechanical overload safety
  • Multi-level system access for making system tamper proof
  • Alerts and data logging for all parameter change events
Back Pressure Regulation
  • Active back-pressure regulation using extraction pressure feedback through PID control
  • Integrated heating to ensure no clogging or freezing effects
  • Precision control for consistent, stable extraction and seperation pressure

MODELS: SIZES & FEATURES

Level 1 Level 2 Level 3
Single Extractor
Volume (Litre)
5 25 100 / 200 / 500
Number of
Extractors
2 2 or 3 2 or 3
Extractors
Usage
Single Single or Series Single or Series
Pressure –
Bar(PSI)
350 – 650
(5000 – 9500)
350 – 650
(5000 – 9500)
350 – 650
(5000 – 9500)
Temperature –
deg C(deg F)
70 -110
(158 – 230)
70 -110
(158 – 230)
70 -110
(158 – 230)
CO2 recirculation Yes Yes Yes
Extractor
changeover valves
Manual or
Automatic
Automatic Automatic
CO2 Pump
Flowrate (LPH)
40 – 80 150 – 350 600 – 3000
Co-Solvent Pump Yes Yes Yes
CO2 Feeding &
Recovery System
Included Included Included
Available
Certifications
CE / U1 / U2 / cGMP
ASME / BPE / UL / SIL-3
CE / U1 / U2 / cGMP
ASME / BPE / UL / SIL-3
CE / U1 / U2 / cGMP
ASME / BPE / UL / SIL-3