Thermodynamic modelling of monomers' solubility in gas phase polymerization of polyolefins

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School of Chemical Engineering | Master's thesis
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Date

2012

Department

Kemian laitos

Major/Subject

Polymeeriteknologia

Mcode

Kem-100

Degree programme

Language

en

Pages

viii + 138

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Abstract

In the literature survey of this thesis work, different thermodynamic models used for modelling of monomers' solubility in polyolefins have been discussed generally. More specifically, Sanchez-Lacombe Equations of State (SL EOS) has been discussed in detail for modelling of monomers' solubility in different polyolefins under industrial gas phase process conditions. In addition, different thermodynamic models for taking into account the elastics effects imposed by the crystalline polymer fraction on the monomers' solubility in amorphous part of the polymer are also discussed in conjunction with SL EOS. The modelling results show that SL EOS can be used for modelling the solubility of binary and multi component alpha-olefin/polyolefin mixtures formed in the industrial gas phase process.SL EOS over predicts the (co)-monomer(s) solubility below polymer melting temperature if elastic effects are not taken into account. A detailed sensitivity analysis about the effect of characteristic parameters on the predictive capabilities of SL EOS has also been done. Among different thermodynamic models evaluated in this work for elastic effects of polymer crystallinity on monomers' sorption, Banaszak's method was found to be the best.

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Supervisor

Seppälä, Jukka

Thesis advisor

Ali, Mohammad Al-haj

Keywords

monomer solubility, Sanchez-Lacombe EOS

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https://urn.fi/URN:NBN:fi:aalto-2020122859160

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[dipl] Kemian tekniikan korkeakoulu / CHEM