22-12-2010, 12:33 PM
Prepared by:
Biswarup Mondal
Biswarup Mondal
bm seminar.ppt (Size: 140.5 KB / Downloads: 288)
INTRODUCTION
Definition: Supercritical Fluid is any substance at a temperature and pressure above its Critical point.
Example: Commonly used Supercritical fluids are CO2 & H2O.
Phase Diagram:
INDEX
Introduction
Properties Of SCF
Applications
Applications ------Extraction
Applications ------Nano Particle Synthesis
Natural Occurrence
Conclusion
PROPERTIES OF SCF
SCF can penetrate solids like gas.
It dissolves materials like liquid.
There is no Surface Tension in SCF.
It has a very good solvent property.
In supercritical environment only one phase exists.
INDEX
Introduction
Properties Of SCF
Applications
Applications ------Extraction
Applications ------Nano Particle Synthesis
Natural Occurrence
Conclusion
APPLICATIONS
Extraction by SCF
Nano-particle Synthesis
Dry- cleaning
Chemical Reaction
Bio-diesel production
Supercritical water power generation
INDEX
Introduction
Properties Of SCF
Applications
Applications ------Extraction
Applications ------Nano Particle Synthesis
Natural Occurrence
Conclusion
APPLICATIONS ------EXTRACTION
Basic procedure:
Partition volatile substances by contacting Supercritical Fluid with feed material.
Soluble material dissolve into the Supercritical Fluid.
The extracted component then separated by changing pressure & temperature.
Finally the SCF recompressed & recycled.
APPLICATIONS ------EXTRACTION
Advantages:
It is relatively rapid for low viscosity & high diffusivity of SCF
Easily recoverable.
Non-toxic solvents leave no harmful residue.
High boiling components are extracted at relatively low temp.
Uses:
IT is largely used in Food & Flavouring industry.
This method is used for Decaffenication of tea & coffee.
Extraction of essential oils, aroma materials from spices etc.
INDEX
Introduction
Properties Of SCF
Applications
Applications ------Extraction
Applications----- Nano Particle Synthesis
Natural Occurrence
Conclusion
APPLICATIONS ---- NANO-PARTICLE SYNTHESIS
Supercritical Fluid Precipitation technology produces particles with Nano-dimension.
This technique is largely used in Pharmaceutical industry
INDEX
Introduction
Properties Of SCF
Applications
Applications ------Extraction
Applications ------Nano Particle Synthesis
Natural Occurrence
Conclusion
NATURAL OCCURRENCE
Submarine -Volcanoes: Steam & gases which are releases from the volcanoes are in high pressure (for sea depth) & temperature.
Planetary –atmosphere: Many planets atmosphere is Supercritical environment for some fluid. Like –Venus, Jupiter etc.
INDEX
Introduction
Properties Of SCF
Applications
Applications ------Extraction
Applications ------Nano Particle Synthesis
Natural Occurrence
Conclusion
CONCLUSION
The system maintain in high pressure.
It is a complex process.
Future:-
It has a great future in upcoming days we will discover many others uses of this technology by
our research.