Premium
Hydrogen response in liquid propylene polymerization: Towards a generalized model
Author(s) -
Ali M. Alhaj,
Betlem B.,
Roffel B.,
Weickert G.
Publication year - 2006
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.10783
Subject(s) - dispersity , polymerization , chemistry , molar mass distribution , catalysis , silane , reaction rate constant , polymer chemistry , monomer , hydrogen , degree of polymerization , polymer , thermodynamics , chemical engineering , organic chemistry , kinetics , physics , quantum mechanics , engineering
Liquid propylene batch experiments in the absence of a gas phase have been carried out using a highly‐active MgCl 2 /TiCl 4 /phthalate/silane/AlR 3 catalyst at varying temperatures (60‐80°C) and molar hydrogen‐monomer ratios of 0‐10 mmol/mol. With increasing hydrogen concentration the polymerization rate increases rapidly, reaching a constant value at concentrations above 1.4 mmol/mol; pseudo‐first‐order catalyst deactivation constant increases; molecular weight decreases; polydispersity decreases slightly; but average molecular weight and polydispersity increase with increasing temperature. Polymerization rate, deactivation constant, and average molecular weight can be modeled based on a consistent dormant site mechanism assuming an (averaged) quasi‐single‐site model. © 2006 American Institute of Chemical Engineers AIChE J,2006