Estimation of polyolefin particle morphology from degassing measurements and growth of polyolefin particles

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Estimation of polyolefin particle morphology from degassing measurements and growth of polyolefin particles

Popis výsledku v původním jazyce

Transport of monomers, co-monomers and diluents in porous polyolefin particles occurring in catalytic polymerization reactors affects the rate of (co-)polymerization, the rate of particle degassing in the down-stream processing and the spatial distribution of copolymer composition in polyolefin particles. Investigations of monomer transport in PE and PP particles by gravimetric techniques conducted in our laboratory have confirmed the existence of large compact zones of polymer in polymer particles. Bobák et al. (2008) have shown that degassing of polyolefin particles is generally non-Fickian, as the fast degassing from small-size polymer zones is followed by a slow degassing from large polymer zones, cf. Figure below. The characteristic time of degassing of polypropylene (PP) particles is tens to hundreds of seconds, which is about 100 times slower than it was previously considered in theoretical considerations based on the so-called multi-grain model. We found that bidisperse particl

Název v anglickém jazyce

Estimation of polyolefin particle morphology from degassing measurements and growth of polyolefin particles

Popis výsledku anglicky

Transport of monomers, co-monomers and diluents in porous polyolefin particles occurring in catalytic polymerization reactors affects the rate of (co-)polymerization, the rate of particle degassing in the down-stream processing and the spatial distribution of copolymer composition in polyolefin particles. Investigations of monomer transport in PE and PP particles by gravimetric techniques conducted in our laboratory have confirmed the existence of large compact zones of polymer in polymer particles. Bobák et al. (2008) have shown that degassing of polyolefin particles is generally non-Fickian, as the fast degassing from small-size polymer zones is followed by a slow degassing from large polymer zones, cf. Figure below. The characteristic time of degassing of polypropylene (PP) particles is tens to hundreds of seconds, which is about 100 times slower than it was previously considered in theoretical considerations based on the so-called multi-grain model. We found that bidisperse particl

Druh

D - Stať ve sborníku

CEP obor

CI - Průmyslová chemie a chemické inženýrství

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2010

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

CHISA 2010

ISBN

978-80-02-02210-7

ISSN

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e-ISSN

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Počet stran výsledku

12

Strana od-do

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Název nakladatele

Process Engineering Publisher, Novosad, J.

Místo vydání

Praha

Místo konání akce

Praha

Datum konání akce

1. 1. 2010

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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