Journal ArticleDOI
Increase in viscosity and its influence on polymerization processes
Reads0
Chats0
TLDR
In this paper, the influence of viscosity and its increase on conductive heat transfer, stirrer power input and cooling capacity, molecular diffusion and mass transfer coefficients, mixing time and residence time distribution in homogeneous and heterogeneous polymerizations in stirred tank and tubular reactors is reviewed.Abstract:
In the course of polymerization in homogeneous systems, the viscosity of the reaction mass increases by several orders of magnitude. The viscosity increase is affected by reaction conditions, concentration and properties of the formed polymer. Empirical correlations for homogeneous and heterogeneous polymerizations are given. Viscosity significantly affects the polymerization kinetics as well as heat, mass and momentum balances of the polymerization reactor. The influence of viscosity and its increase on conductive heat transfer, stirrer power input and cooling capacity, molecular diffusion and mass transfer coefficients, mixing time and residence time distribution in homogeneous and heterogeneous polymerizations in stirred tank and tubular reactors is reviewed.read more
Citations
More filters
Journal ArticleDOI
CFD simulation of fluidized bed reactors for polyolefin production – A review
Mohammad Jakir Hossain Khan,Mohamed Azlan Hussain,Zahra Mansourpour,Navid Mostoufi,Nayef Ghasem,Ezzat Chan Abdullah +5 more
TL;DR: In this paper, a literature survey focusing on the application of computational fluid dynamics (CFD) in various aspects of the fluidized bed reactor is presented, which highlights the use of CFD on polyolefin production.
Journal ArticleDOI
Curing of unsaturated polyester resins: Viscosity studies and simulations in pre‐gel state
Yeong-Show Yang,Laurent Suspene +1 more
TL;DR: In this article, a gelation model concerning the formation of intra-crosslinked polymer coils, called microgels, was proposed, which describes the gelation mechanism in four stages: induction, microgel formation, transition, and macro-gelation.
Journal ArticleDOI
Lignin Depolymerization with Phenol via Redistribution Mechanism in Ionic Liquids
TL;DR: In this paper, the redistribution mechanism with phenols in ionic liquids was used for lignin depolymerization, and two selected lignins were characterized based on their chemical structure and molecular weight.
Journal ArticleDOI
CFD analysis of mixing in thermal polymerization of styrene
TL;DR: The simulation showed the formation of a well-mixed region around the impeller and stagnant or slow moving fluids elsewhere in the reactor due to high viscosity of the polymer mass and the monomer conversion computed using the CFD model was in good agreement with that obtained from the CSTR model at low residence time.
Journal ArticleDOI
Free radical polymerizations associated with the Trommsdorff effect under semibatch reactor conditions : An improved model
V. Seth,Santosh K. Gupta +1 more
TL;DR: In this article, the free volume theory has been used to account for the changes in the diffusion coefficients with time, and the model parameters are tuned using experimental data on the isothermal bulk and solution poymerization on polymethylmethacrylate (PMMA) on batch (ampoule) reactors.
References
More filters
Book
Viscoelastic properties of polymers
TL;DR: In this article, the authors describe the nature of Viscoelastic behavior of polymeric systems and approximate relations among the linear Viscoels and approximate interrelations among the Viscelastic Functions.
Book
Chemical Reaction Engineering
TL;DR: An overview of Chemical Reaction Engineering is presented, followed by an introduction to Reactor Design, and a discussion of the Dispersion Model.
Journal ArticleDOI
Über die von der molekularkinetischen Theorie der Wärme geforderte Bewegung von in ruhenden Flüssigkeiten suspendierten Teilchen
TL;DR: In el marco del Proyecto subvencionado by the Fundación Antorchas (FAN) as discussed by the authors, el material was digitalizado, e.g., en la Biblioteca del Departamento de Fisica de la Facultad de Ciencias Exactas de la Universidad Nacional de La Plata.