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Factors affecting high-pressure solvent extraction (accelerated solvent extraction) of additives from polymers
H J Vandenburg1, A A Clifford, K D Bartle
1School of Chemistry, University of Leeds, LS2 9JT, U.K.
Analytical Chemistry
|June 10, 2011
Summary
Accelerated solvent extraction efficiently removes Irganox 1010 from polypropylene using solvents like 2-propanol at high temperatures. Optimized conditions maximize extraction rates while preventing polymer dissolution.
Area of Science:
- Polymer Chemistry
- Analytical Chemistry
- Chemical Engineering
Background:
- Irganox 1010 is a crucial antioxidant in polypropylene.
- Efficient extraction methods are needed for polymer analysis and recycling.
- Accelerated solvent extraction (ASE) offers a rapid alternative to traditional methods.
Purpose of the Study:
- To optimize accelerated solvent extraction (ASE) of Irganox 1010 from polypropylene.
- To investigate the influence of solvents and temperature on extraction efficiency.
- To model the extraction kinetics and determine diffusion parameters.
Main Methods:
- Utilized a homemade accelerated solvent extraction system.
- Employed freeze-ground polypropylene and various solvents (2-propanol, acetone, cyclohexane).
- Varied temperature and pressure; analyzed extraction kinetics using the "hot ball" model.
Main Results:
- Achieved 90% Irganox 1010 extraction in 5 minutes with 2-propanol at 150 °C.
- Extraction curves fitted the "hot ball" model, enabling diffusion coefficient determination.
- Identified optimal extraction temperatures to avoid polymer dissolution and line blockage.
Conclusions:
- ASE is a highly effective method for rapid Irganox 1010 extraction from polypropylene.
- Solvent choice and temperature significantly impact extraction efficiency and kinetics.
- Understanding diffusion and polymer swelling is key to optimizing ASE parameters.
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