Polymer producing method and apparatus and polymer degassing method and apparatus

A manufacturing method and a technology of polymers, which are applied in the field of polymer manufacturing, can solve problems such as poor devolatilization performance, lowered performance, and methods and devices that do not record the monomer removal process, and achieve the goal of suppressing coloring and suppressing residence time increased effect

Inactive Publication Date: 2009-05-06
HITACHI LTD
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Problems solved by technology

However, for lattice-shaped stirring blades, if the viscosity of the reaction liquid does not reach a certain level, the performance of lifting the reaction liquid for stirring and devolatilization will be significantly reduced
Therefore, it is presumed that the devolatilization performance is deteriorated for the reaction solution with low

Method used

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  • Polymer producing method and apparatus and polymer degassing method and apparatus
  • Polymer producing method and apparatus and polymer degassing method and apparatus

Examples

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Embodiment

[0104] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, but the scope of the present invention is not limited thereto.

[0105] figure 1 It is an overall view explaining the production process of polylactic acid to which the present invention is applied. figure 2 It is a cross-sectional view of a devolatilization device to which polylactic acid of the present invention is applied.

[0106]The manufacturing process of the present example includes a reaction step of polymerizing polylactic acid to produce it, and a devolatilization step of subjecting polylactic acid polymerized by the reaction step to a devolatilization treatment. In the reaction process, a lactide supply device 1, a lactide melting device 2, a catalyst supply device 3, a polymerization initiator supply device 4, a lactide supply device 5, a horizontal reaction tank 6, and a vertical reaction tank are used. Polylactic acid was polymerized with the c...

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Abstract

The objective of this invention is to inhibit yellowing of a polymer caused by thermal decomposition when degassing a monomer from a reactant. This invention provides a polymer degassing apparatus comprising a barrel-shaped horizontal container 41 having a supply port 42 for supplying a reactant, a discharge port 43 for discharging a reactant, a stirring means 45 for stirring a reactant, and a degassing means for drawing a gas via a degassing port 44 of the horizontal container, wherein the supply port is positioned below the molten liquid level of the reactant, a recovery container 37 that is connected to the degassing port for recovering a volatile substance in the gas and a vacuum pump 36 are provided, and the stirring means comprises a plurality of stirring rods 46 oriented along the same direction as the axis in the horizontal container and coupling members 47 for coupling the stirring rods along the same direction as the axis, provided that the coupling members are placed at a distance from the virtual rotation center of the stirring means.

Description

technical field [0001] The invention relates to a polymer manufacturing method, a manufacturing device, a polymer devolatilization device and a devolatilization method, in particular to a technology for removing unreacted monomers from ring-opening polymers such as polylactic acid. Background technique [0002] Polylactic acid, one of polymers synthesized by ring-opening polymerization, is a colorless and transparent polyester produced from lactic acid, which is one of hydroxycarboxylic acids, as a raw material. As one of the methods for synthesizing polylactic acid from lactic acid, there is a known method: condensing lactic acid to form an oligomer, adding a catalyst such as antimony oxide to depolymerize it to produce lactide as a cyclic condensate (dimerization of lactic acid) body), ring-opening polymerization is carried out by adding a catalyst such as tin octoate to the lactide. [0003] As a method for polymerizing polylactic acid, for example, there is known a cont...

Claims

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Application Information

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IPC IPC(8): C08G63/78C08G63/88C08G63/08
Inventor 松尾俊明上川将行冈宪一郎冈本成恭加治屋隆司
Owner HITACHI LTD
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