Acceleration of Chemical Reaction in Reactive Extrusion Accompained by Devolatilization
-
L. Chen
Abstract
This work concerns the reaction acceleration in bubble enhanced devolatilization (DV) occurring in reactive extrusion (REX), to provide further evidence that overall reactivity can be enhanced by boiling. Using monoesterification of a styrenemaleic anhydride copolymer with an alcohol as a model reaction, the rate increase was determined by comparing the conversions of the samples collected at different screw locations with those predicted from the combined kinetic equation for the bubble free homogeneous system and the RTD information obtained from both the RTD measurements and theoretical calculations.
Significant reaction acceleration was observed. The reaction enhancement was found to be more significant than found previously by batch operation. Also, the reaction enhancement beyond the DV zone showed a trend consistent with the previous observations in batch after DV has been halted. Further, we show that the apparent reaction rate increase during continuous REX/DV is caused by local mass transfer effects, in agreement with the previous work in batch. The good agreement between the theoretical predictions and the experimental results, observed here, lends some extended generality to the mass transfer model for reaction acceleration during REX/DV.
© 1996, Carl Hanser Verlag, Munich
Articles in the same Issue
- Contents
- Contents
- Editorial
- First in a Series: Pioneers of Polymer Processing: Thomas Hancock – The First Polymer Processing Innovator
- Mixing
- The Extensional Flow Mixer, EFM
- Reactive Extrusion
- Continuous Polymerization of Caprolactam-Polyether Sulfone Solutions in a Twin Screw Extruder to Form Reactive Polyamide–6/Polyether Sulfone Blends and Their Melt Spun Fibers
- Biodegradable Poly(Lactic Acid) with High Molecular Weight
- Acceleration of Chemical Reaction in Reactive Extrusion Accompained by Devolatilization
- Fibers and Films
- Viscous-Elastic Effects in a PA 6 Melt – Cause of Unevennesses in Melt-Spun Yarns**
- Gear Pump Performance in Polypropylene Filament Yarn Uniformity
- Molding
- Physically-Based Model of Thermoplastics Injection Molding for Control Applications
- Effect of Pressure and Shear Stress on Crystallization Behaviors in Injection Molding
- The Crystallinity of PVC and its Effect on Physical Properties**
- Molecular Orientation in Polycarbonate Induced by Cooling Stresses
Articles in the same Issue
- Contents
- Contents
- Editorial
- First in a Series: Pioneers of Polymer Processing: Thomas Hancock – The First Polymer Processing Innovator
- Mixing
- The Extensional Flow Mixer, EFM
- Reactive Extrusion
- Continuous Polymerization of Caprolactam-Polyether Sulfone Solutions in a Twin Screw Extruder to Form Reactive Polyamide–6/Polyether Sulfone Blends and Their Melt Spun Fibers
- Biodegradable Poly(Lactic Acid) with High Molecular Weight
- Acceleration of Chemical Reaction in Reactive Extrusion Accompained by Devolatilization
- Fibers and Films
- Viscous-Elastic Effects in a PA 6 Melt – Cause of Unevennesses in Melt-Spun Yarns**
- Gear Pump Performance in Polypropylene Filament Yarn Uniformity
- Molding
- Physically-Based Model of Thermoplastics Injection Molding for Control Applications
- Effect of Pressure and Shear Stress on Crystallization Behaviors in Injection Molding
- The Crystallinity of PVC and its Effect on Physical Properties**
- Molecular Orientation in Polycarbonate Induced by Cooling Stresses
