Process for feeding catalyst to fluidized bed for vapor phase polymerization
AssigneeNippon Petrochemicals Company, Limited
InventorsKunimichi Kubo, Motokazu Watanabe, Mamoru Yoshikawa, Masatoshi Morikawa, Yoshihisa Yamaguchi
Life of this patent
Estimating the term…
Abstract
A process for feeding a powder catalyst with a gas intermittently to a high-pressure fluidized bed reactor for the vapor phase polymerization of olefin, wherein the cross section of a catalyst feed pipe is reduced midway through the pipe to thereby make continual catalyst feeding possible and prevent the formation of a lump polymer.
Claims8
In a process for the vapor phase fluidized bed polymerization of olefins which comprises providing a particulate catalyst to a polymerization reaction chamber, providing an olefin and polymerization reactants to said chamber, and causing said olefin, reactants and catalyst to bring about a polymerization reaction, the improvement of which comprises providing a particulate catalyst to the reaction chamber through a catalyst feed pipe having a first portion of a first inner diameter, a second portion of a second inner diameter less than that of the first inner diameter, and a third portion between said first and second portions having an inner diameter which is reduced along its length from said first to said second inner diameter.
Dependencies are inferred from the claim text.