Journal ArticleDOI
Modeling of poly(ethylene terephthalate) reactors: 6. A continuous process for final stages of polycondensation
K. Ravindranath,R. A. Mashelkar +1 more
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TLDR
In this paper, a mathematical model of a continuous polycondensation reactor used in the finishing stages is developed, which predicts the directions in which mixing, and other process and operational variables, will influence the progress of poly condensation.Abstract:
A mathematical model of a continuous polycondensation reactor used in the finishing stages is developed. This axial dispersion model predicts the directions in which mixing, and other process and operational variables, will influence the progress of polycondensation. The available pilot plant data have been compared with the model predictions. In view of the neglect of the side reactions in our model, the comparison is only approximate but appears reasonable. The analysis developed is used to highlight certain critical design considerations.read more
Citations
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Journal ArticleDOI
Review of conventional and novel polymerization processes for polyesters
TL;DR: Ring-opening polymerization has some advantages over the conventional polymerization method, such as it does not produce a small molecule byproduct, whose removal requires high temperature and high vacuum.
Journal ArticleDOI
Polyethylene terephthalate—II. Engineering analysis
K. Ravindranath,R. A. Mashelkar +1 more
TL;DR: In this paper, the current status on mathematical modelling of semibatch and continuous PET reactors is reviewed with clear indication of existing gaps, and the molecular weight distribution during PET formation and melt blending have also been considered.
Journal ArticleDOI
Unified Modeling for Polycondensation Kinetics.
L. L. Jacobsen,W. H. Ray +1 more
TL;DR: In this article, a step-growth polymerization system is described, in which polymer growth occurs not just from monomer addition but from polymer-polymer reactions, and the reactions occurring during polycondensation often cause the production of a small molecule byproduct called a condensate.
Journal ArticleDOI
A mass transfer model for a twin-screw extruder
TL;DR: A mass transfer model was developed to represent the desorption of a volatile species from a molten polymer in an extruder consisting of co-rotating twin screws in a figure-eight bore.
Journal ArticleDOI
Water sorption and diffusion through saturated polyester and their nanocomposites synthesized from glycolyzed PET waste with varied composition
TL;DR: In this article, a new system of saturated polyester and their nanocomposites synthesized from glycolyzed PET with varied composition is investigated for the sorption and diffusion studies in water.
References
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Journal ArticleDOI
Modèle représentatif de la distribution des temps de séjour dans un réacteur semi-infini à dispersion axiale avec zones stagnantes. Application à l'écoulement ruisselant dans des colonnes d'anneaux Raschig
TL;DR: In this article, an expression analytique regoureuse de la distribution des temps de sejour dans un reacteur semi-infini a ecoulement piston avec dispersion axiale and echange de matiere avec des zones stagnantes est etablie.
Journal ArticleDOI
Longitudinal dispersion at small and large Peclet numbers in chemical flow reactors
TL;DR: In this paper, a perturbation method was used to get an approximate solution of the second order differential equation of the longitudinal dispersion model for both large and small Peclet numbers assuming a general kinetics of the chemical reaction.
Journal ArticleDOI
The kinetics of condensation polymerization
TL;DR: In this paper, the penetration theory equations for a generalized condensation polymerization reaction have been solved and some solutions are presented, which are compared with an analytical solution for the special case of no diffusional resistance.
Journal ArticleDOI
Gas absorption into non-newtonian fluids in rotating disc contactors
D.D. Ravetkar,D.D. Kale +1 more
TL;DR: In this article, mass transfer characteristics for rotating disc contactor where a number of discs are mounted on a horizontal shaft and are partially submerged in a pool of liquid, are determined experimentally for Newtonian and non-Newtonian fluids.
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