Mitsui Petrochemical Industries, Ltd.

Mitsui Chemicals, Inc.

Mitsunori Ichimura

Ryoichi Yamamoto

Akira Tsuzaki

Yoshiaki Annen

Takao Uetake

Isao Shizuma

Yoshiaki Kikuchi

Toshihiro Okano

Katsutoshi Horimoto

A method for vapor phase polymerization comprises blowing a gaseous monomer from a bottom of a fluidized bed reactor through a distributor plate into the reactor by means of a blower while feeding a solid catalyst into the reactor to thereby form a fluidized bed in the reactor and conducting a vapor phase polymerization to produce a polymer or copolymer, wherein the blower has a slide or rotational slide part between its discharge side as a high pressure side and its suction side as a low pressure side in a blower body casing, said slide or rotational slide part being provided with a noncontacted gas leakproof seal part at a clearance ranging from 0.7 to 2.5 mm.

Method of vapor phase polymerization, vapor phase polymerizer and blower

Disclosed is a drying hopper comprising, disposed in its lower position, a cone portion having diameters gradually decreasing toward a lower end thereof, in which a high temperature gas is injected toward powder descending in the cone portion to thereby dry the powder, wherein said drying hopper comprises a cone portion 11 having a slant, circular wall, said cone portion 11 having a plurality of vertically spaced rows of nozzles 20, formed through the circular wall, disposed at predetermined intervals in a circumferential direction of the circular wall; a plurality of vertically spaced ring-like shells 21 fluidtightly attached to an external surface of the circular wall of the cone portion 11 with interstices therebetween in positions such that said plurality of rows of nozzles 20 are respectively, at gas inlets thereof, covered by said plurality of ring-like shells 21; and a plurality of gas feed pipes 22 respectively connected to said plurality of ring-like shells 21 in communicating relationship. By virtue of this drying hopper, powder, e.g., polyethylene powder, can be dried to a solvent content as small as 20 ppm by weight or less by low cost, simple operations.

Drying hopper and powder drying method using the same

Drying hopper for polymer powder

A fluid bed reactor system for olefin polymerization composed of a cylindrical reaction vessel equipped with a distribution plate and an agitator, characterized in that the distribution plate satisfies the following conditions,

Fluid bed reactor system composed of cylindrical reaction vessel

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Ichihara, Japan

Mitsunori Ichimura