Hydrolytic Depolymerization of Polyethylene Terephthalate by Reactive Extrusion
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T. Yalçinyuva
Abstract
Continuous hydrolytic depolymerization of polyethylene terephthalate (PET) resin at high temperature and pressure was carried out in a co-rotating twin screw extruder. In this novel process, hydrolysis is achieved by injection of saturated steam at high pressure. Optimum conditions occur at relatively low screw speeds and water/PET ratios. Hydrolysis extent was measured using carboxyl end group titration, and by determination of molecular weights using NMR and GPC analysis. Low molecular weight products are obtained at low residence times in the extruder, suggesting high depolymerization rates. This is supported by the results of a simple kinetic model.
Acknowledgements
The authors are grateful to the Martinex Research Corporation, the Natural Science and Engineering Research Council of Canada (NSERC) and the Ministry of Education, Government of Quebec for the support of this work, and to Eastman Kodak Company for supplying the PET resins used.
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Articles in the same Issue
- Contents
- Editorial
- Second of a Series: Pioneering Polymer Industry Developments—The IG Farbenindustrie and the Establishment of Synthetic Rubber
- Screw extrusion/mixing
- Analysis of Mixing in Corotating Twin Screw Extruders through Numerical Simulation
- Melt Conveying in Co-rotating Twin Screw Extruders
- The Adjustable Grooved Feed Extruder
- Reactive Extrusion
- Hydrolytic Depolymerization of Polyethylene Terephthalate by Reactive Extrusion
- Effect of Conversion on Chain Addition Copolymerizations Performed in a Backmixed Drag Flow Extruder Reactor
- Fiber and film
- Single and Double Bubble Tubular Film Extrusion of Polybutylene Terephthalate
- Molding
- Viscoplastic Material Modeling for the Stretch Blow Molding Simulation
- The Effects of Compression Pressure on Injection Compression Molding
- Numerical Simulation of Compression Molding of UHMWPE
- Numerical Simulation of Compression Molding of UHMWPE
- Mechanical Properties of Isotactic Polypropylene with Oriented and Cross-hatched Lamellae Structure
- Morphological Characterisation of Long Glass Fibre Composites for the Thermoforming Process
- PPS News
- PPS News
- Professional news
- New Petrochemical Complexes
Articles in the same Issue
- Contents
- Editorial
- Second of a Series: Pioneering Polymer Industry Developments—The IG Farbenindustrie and the Establishment of Synthetic Rubber
- Screw extrusion/mixing
- Analysis of Mixing in Corotating Twin Screw Extruders through Numerical Simulation
- Melt Conveying in Co-rotating Twin Screw Extruders
- The Adjustable Grooved Feed Extruder
- Reactive Extrusion
- Hydrolytic Depolymerization of Polyethylene Terephthalate by Reactive Extrusion
- Effect of Conversion on Chain Addition Copolymerizations Performed in a Backmixed Drag Flow Extruder Reactor
- Fiber and film
- Single and Double Bubble Tubular Film Extrusion of Polybutylene Terephthalate
- Molding
- Viscoplastic Material Modeling for the Stretch Blow Molding Simulation
- The Effects of Compression Pressure on Injection Compression Molding
- Numerical Simulation of Compression Molding of UHMWPE
- Numerical Simulation of Compression Molding of UHMWPE
- Mechanical Properties of Isotactic Polypropylene with Oriented and Cross-hatched Lamellae Structure
- Morphological Characterisation of Long Glass Fibre Composites for the Thermoforming Process
- PPS News
- PPS News
- Professional news
- New Petrochemical Complexes
