Continuous stirring device and continuous polycondensing method for polymer resin

Abstract

An apparatus for continuous stirring comprising a horizontal elongated cylindrical vessel and two rotating blade assemblies rotatable in the direction opposite to each other provided in parallel to each other in the vessel, where a liquid feed is moved from one end to another therethrough by rotation of the two rotating blade assemblies in the direction opposite to each other, while stirring and mixing the liquid feed, the two rotating blade assemblies each comprising rotor shafts (3a-3b or 3c-3d) supported at both ends of the rotating blade assemblies, support members (4) each fixed to the rotor shafts, connecting members (5) span between the support members (4) and in positions far from the substantial rotating shaft center and a plurality of plate-shaped stirring blades (6) arranged in parallel in the longitudinal direction of the substantial rotating shaft center and fixed to the connecting members (5).

Description

technical field [0001] The present invention relates to a stirring device and method for high-viscosity substances, especially the continuous polycondensation of polycondensation series polymers (polymer resins) such as polyethylene terephthalate and polycarbonate or continuous stirring, mixing, and degassing. Stirring device and continuous polycondensation process of polymer polyester. Background technique [0002] Hitherto, a horizontally elongated cylindrical device for continuous processing such as continuous stirring and polycondensation of polyethylene terephthalate or the like has been disclosed in the following patent documents: U.S. Patent No. 4,776,703 (JP-A- 62-112624), JP-A-3-239727 or US Patent No. 3,964,874 (JP-A-48-102894). [0003] U.S. Patent No. 4,776,703 discloses a method for continuously processing high-viscosity substances, which includes a horizontally elongated cylindrical container and two rotary blade assemblies, each rotary blade assembly includes...

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Problems solved by technology

[0005] In U.S. Patent No. 4,776,703, two rotary blade assemblies are composed of rod-shaped rectangular frame elements, and adjacent rod-shaped rectangular frame elements are connected to each other with a predetermined phase difference, spanning between the rotor shafts, therefore, suitable for agitation and mixing Feed liquids with high viscosity, such as substances with low resistance and a viscosity of about 1000 Pas or higher, but in the case of feed liquids with a viscosity of less than about 1000 Pas, the rod-shaped rectangular frame elements can only allow the feed liquid to pass freely and cannot effectively The feed liquid is scraped upwards, therefore, the evaporation of volatiles cannot be promoted, and the residence time is thus prolonged

[0006] U.S. Patent No. 3,964,874 is suitable for agitating and mixing feed liquids with low viscosity, but in the case of feed liquids with a viscosity greater than several hundred Pas, the stagnant high-viscosity feed liquid attached to the surface of the rotary shaft is easily mixed with the return The shafts rotate together, so that stagnant high-viscosity feed liquid is susceptible to thermal deterioration, etc., resulting in a decrease in the quality of the resulting liquid product

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