Japan Polypropylene Corporation

Nobuhiro Iwai

Takanori Nakashima

Yoshitaka Kobayashi

Yusuke Yamada

Kiyoshi Yukawa

Hajime Aoyama

A method for producing a propylene-based polymer, including polymerizing propylene or propylene and an &#x3b1;-olefin except propylene in the presence of a catalyst with a horizontal polymerization reactor equipped with stirring vanes rotating around a horizontal axis therein by a continuous vapor-phase polymerization, which removes heat of polymerization by heat of vaporization of a liquefied propylene, wherein the reactor can set a plurality of area sections different in temperature in a horizontal direction inside the reactor, and satisfies at least one of i) a temperature difference, &#x394;T=T&#x3c9;&#x2212;T&#x3b1;, between an area section including an upstream end of the reactor (T&#x3b1;) and a downstream end (T&#x3c9;) thereof is 0.1 to 20&#xb0; C. and ii) a temperature difference, &#x394;T=Tx&#x2212;Tz, between an area section including a catalyst feed part (Tx) and dew point (Tz) of a mix gas in the reactor is 0 to 5&#xb0; C.

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Ichihara, Japan

Nobuhiro Iwai