Patent ID: 7897705

Claim:
A process for producing an olefin polymer comprising the steps of: using a gas phase reaction vessel; polymerizing an olefin by use of a catalyst for olefin polymerization in the presence of hydrogen; and adding a hydrogenation catalyst to a bed portion in the gas phase reaction vessel; wherein the bed portion, to which the hydrogenation catalyst is added, is a powder-concentrated portion having a bulk density of polymerized powder of not less than 0.10 g/cc in a gas phase reaction vessel, and the addition place of the hydrogenation catalyst in a fluidized bed type gas phase polymerization is within a bed portion formed just above a dispersing board and the hydrogenation catalyst is added to a portion having a height of 0 to 0.5H when the height of a dispersing board is presumed as 0 and the height of a bed portion is presumed as H.