Identification of catalytic site types for complex polymerization system using simultaneous deconvolution

Name: Tamaned Chayrattanaroj.

LCSH: Kasetsart University -- Dissertations. Ph.D. (Chemical Engineering) 2023.

Classification :.LCCS: TP156.P6

LCSH: Kasetsart University. -- Department of Chemical Engineering -- Dissertatioins.

LCSH: Polymerization.

LCSH: Polymers.

LCSH: Catalysts.

Abstract: Polyethylene plays an essential role as a material in countless applications. In the commercial production of polyethylene, multiple-site-type catalysts (e.g., Ziegler–Natta catalysts) are commonly used. These catalysts enable the production of polymers with a wide range of microstructures and properties. However, each site type within these catalysts possesses a different set of polymerization kinetic constants, resulting in the production of polymers with broad chain microstructures. While characterization techniques can provide insight into overall chain microstructures, they cannot directly measure chain microstructures produced on each site type. To address this challenge, deconvolution technique is developed. Deconvolution is used to identify the number of site types and chain microstructures of polymers produced from each site type based on microstructural distributions of whole samples. Previous studies have investigated deconvolution of molecular weight distribution (MWD) and chemical composition distribution (CCD) of homopolymers and/or copolymers produced within a single reactor. However, industrial systems are more complicate than the current model, such as multi-reactor system or systems involving multi-component copolymerization. In this work, simultaneous deconvolution procedures were developed for complex polyethylene system, including both two-reactor system and terpolymer systems. These new approaches serve to identify an appropriate number of site types, estimate chain microstructures, and determine the mass fraction of polymers produced on each site type. Furthermore, these simultaneous deconvolution procedures enhance our understanding of the unique behavior exhibited by each site type in both reactor setups and terpolymer system, leading to improved control over polymer chain microstructures within such complex systems.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Siripon Anantawaraskul

Role: Thesis Advisor

Name: Anusorn Seubsai

Role: Thesis Co-Advisor

Created: 2023

Modified: 2025-06-25

Issued: 2025-06-25

วิทยานิพนธ์/Thesis

วิทยานิพนธ์/Thesis

application/pdf

URL: http://www.lib.ku.ac.th/KUthesis/2566/tamaned-cha-all.pdf

CallNumber: TP156.P6.T35

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Chemical Engineering

Grantor: Kasetsart University

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