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Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)

1. Κωτούλας, Κωνσταντίνος. Πρόβλεψη της κατανομής μεγέθους σωματιδίων σε αντιδραστήρες πολυμερισμού αιωρήματος.

Degree: 2006, Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)

The present dissertation is concerned with the development of a generalized mathematical model for the simulation of the dynamic operation of the suspension polymerization process and the prediction of the monomer conversion and the molecular and morphological properties of the polymer (e.g., average molecular weights, molecular weight distribution, particle size distribution and mean particle size, grain porosity and bulk density). For the prediction of the molecular properties of the polymer several mathematical models from the literature were used, while we have developed two new algorithms for the description of the thermal polymerization of styrene and the free-radical polymerization in the presence of bifunctional initiators. The prediction of the mean particle size and the particle size distribution is based on two population balance models. The first one assumes a homogeneous turbulent flow field around the reactor and was used for the simulation of laboratory suspension polymerization reactors. The latter, takes into account the non-homogeneity of the turbulent flow field and divides the reactor into two compartments, where in each of them the flow field is assumed to be homogeneous, and was used for the simulation of pilot and industrial scale suspension polymerization reactors. The drop breakage and coalescence phenomena are closely related to the mixing conditions in the reactor and the dynamic evolution of the physical properties of the continuous and dispersed phases during the polymerization. For this reason, the mixing process in a stirred tank reactor was studied in order to calculate the energy dissipation rate and the circulation rate in the reactor. For the simulation of the non-homogeneity of the turbulent flow field we divided the reactor into two compartment: one compartment of small volume and high turbulent intensities near the agitator blades, and a second one for the rest of the reactor, where the flow will be relatively calm. The volumes and the rates of energy dissipation in each compartment came from computational fluid dynamics (CFD) simulations. A separate model was developed for the calculation of the physical properties of the different phases and more specifically the density and viscosity of the continuous and dispersed phases and the interfacial tension between water and monomer. The accurate calculation of these properties is of crucial importance for the dynamic calculation of the particle size distribution in suspension polymerization reactors. Finally, we implemented various numerical methods for the solution of the population balance equations, in order to develop a robust and accurate algorithm for the prediction of the particle size distribution.

Στην παρούσα εργασία γίνεται μια προσπάθεια να αναπτυχθεί ένα γενικευμένο μαθηματικό μοντέλο δυναμικής προσομοίωσης της διεργασίας πολυμερισμού αιωρήματος με στόχο την πρόβλεψη του βαθμού μετατροπής του μονομερούς, και των μοριακών και μορφολογικών ιδιοτήτων του παραγόμενου πολυμερούς (π.χ., μέσα μοριακά βάρη, κατανομή μοριακού…

Subjects/Keywords: Πολυμερισμός ελεύθερων ριζών; Πολυμερισμός αιωρήματος; Πολυβινυλοχλωρίδιο; Πολυστυρένιο; Διάσπαση σταγόνων; Συστωμάτωση σταγόνων; Ανάμιξη; Μορφολογία σωματιδίων; Free radical polymerization; Suspension polymerization; Polyvinylchloride; Polystyrene; Droplet breakage; Droplet coalescence; Mixing; Particle morphology

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Κωτούλας, . . (2006). Πρόβλεψη της κατανομής μεγέθους σωματιδίων σε αντιδραστήρες πολυμερισμού αιωρήματος. (Thesis). Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ). Retrieved from http://hdl.handle.net/10442/hedi/15277

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Κωτούλας, Κωνσταντίνος. “Πρόβλεψη της κατανομής μεγέθους σωματιδίων σε αντιδραστήρες πολυμερισμού αιωρήματος.” 2006. Thesis, Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ). Accessed December 10, 2019. http://hdl.handle.net/10442/hedi/15277.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Κωτούλας, Κωνσταντίνος. “Πρόβλεψη της κατανομής μεγέθους σωματιδίων σε αντιδραστήρες πολυμερισμού αιωρήματος.” 2006. Web. 10 Dec 2019.

Vancouver:

Κωτούλας . Πρόβλεψη της κατανομής μεγέθους σωματιδίων σε αντιδραστήρες πολυμερισμού αιωρήματος. [Internet] [Thesis]. Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); 2006. [cited 2019 Dec 10]. Available from: http://hdl.handle.net/10442/hedi/15277.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Κωτούλας . Πρόβλεψη της κατανομής μεγέθους σωματιδίων σε αντιδραστήρες πολυμερισμού αιωρήματος. [Thesis]. Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); 2006. Available from: http://hdl.handle.net/10442/hedi/15277

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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