Manufacturing apparatus of polylactic acid and manufacturing method of polylactic acid
AssigneeTeijin Limited
InventorsHideshi Kurihara, Takeshi Katsuda, Kiyotsuna Toyohara, Ryuji Nonokawa, Hirotaka Suzuki, Kenji Ohashi
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Abstract
A manufacturing apparatus of polylactic acid having at least an inlet and an outlet of a substance to be reacted and an exhaust port provided in a horizontal reaction vessel not having continuous rotating shafts in a direction of center line of a rotating shaft of a stirring blade provided in the reaction vessel and a manufacture method. By removing low molecular weight substance in the polylactic acid, high-quality polylactic acid can be stably manufactured.
Claims10
A manufacturing apparatus of polylactic acid having at least an inlet and an outlet of a substance to be reacted and an exhaust port and provided with the following elements (A) to (E):
- (A) a cylindrical reactor having an inlet and an outlet thereof in the vicinity of both ends thereof, respectively;
- (B) rotatory end discs provided opposing to each other in the both ends in the inside of the reactor;
- (C) a disc arranged between the end discs and having an opening in a central part thereof;
- (D) a helically provided stirring blade installed between the end disc and the opening disc and between the opening discs and provided in close contact with or in the vicinity of an internal circumferential wall surface of the reactor along a longitudinal direction of a shaftless cage type reactor;
- and
- (E) a free surface area forming member provided on an extension of the stirring blade towards the inside of the reactor.
A manufacturing method of polylactic acid by using a shaftless cage type reactor provided with the following elements (a) to (e):
- (a) a cylindrical reactor having an inlet and an outlet thereof in the vicinity of both ends thereof, respectively;
- (b) rotatory end discs provided opposing to each other in the both ends in the inside of the reactor;
- (c) a disc arranged between the end discs and having an opening in a central part thereof;
- (d) a stirring blade installed between the end disc and the opening disc and between the opening discs and provided in close contact with or in the vicinity of an internal circumferential wall surface of the reactor along a longitudinal direction of a shaftless cage type reactor;
- and
- (e) a free surface area forming member provided on an extension of the stirring blade towards the inside of the reactor.
Dependencies are inferred from the claim text.