JP2000204164A - Continuous polycondensation apparatus and method - Google Patents

Abstract

(57) [Summary] The present invention provides a high-quality polymerization by imparting a residence time and a surface renewal effect required for a reaction to a liquid to be treated by feeding the liquid in the longitudinal direction of the main body. An object of the present invention is to provide an apparatus and a method capable of efficiently producing a product. A part of a plurality of agitating blades (20) formed of a ring-shaped support plate provided so as to mesh with two rotating shafts (3) in a longitudinal direction inside a main body (1) is partially attached to the main body. This is achieved by making the liquid to be treated have a feeding effect by being inclined in the longitudinal direction. [Effect] In addition to giving an efficient stirring and surface renewing action to the liquid to be treated, and giving a feeding action in the longitudinal direction of the main body, a high quality polymer can be efficiently produced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous stirring device for highly viscous substances, and more particularly to a device suitable for continuous polymerization of polycondensation polymers such as polyethylene terephthalate and polycarbonate.

[0002]

2. Description of the Related Art Conventionally, as a continuous polymerization apparatus for a polycondensation polymer such as polyethylene terephthalate, Japanese Patent Publication No. Sho 50-2
As disclosed in JP-A-1514 and JP-A-61-264004, stirring blades of two rotating shafts are installed so as to mesh with each other, a scraping plate is used to scoop up the liquid to be treated, promote surface renewal, and remove volatiles. Some were allowed to evaporate and react.

[0003]

However, the prior art described above does not take into consideration the liquid feeding action in the longitudinal direction of the main body of the liquid to be treated, whose viscosity increases due to the reaction from the inlet to the outlet.

An object of the present invention is to improve the above prior art,
To provide an apparatus and a method capable of efficiently producing a high-quality polymer by imparting a residence time and a surface renewal effect necessary for a reaction to a liquid to be treated by feeding the liquid in a longitudinal direction of the main body. It is in.

[0005]

FIG. 1, FIG. 2, and FIG. 3 show an embodiment of the present invention. 1 is a partial cross-sectional plan view, and FIG.
FIG. 3 is a front view showing a cross section taken along line BB of FIG. 1.

1 to 3, reference numeral 1 denotes a horizontally long cylindrical container body whose outer periphery is covered with a heat medium jacket 2, and two rotation shafts 3a and 3b are attached in the longitudinal direction of the body 1. . Lower part of one end in the longitudinal direction of main body 1 (left side in FIG. 3)
An inlet nozzle 4 and an outlet nozzle 5 for the liquid to be treated are provided at the lower part of the other end (on the right side in FIG. 3), and an outlet nozzle 6 for volatile matter is attached to the upper part of the main body 1.

[0007] A plurality of stirring blades 20 made of a ring-shaped support plate are attached to each of the rotating shafts 3a and 3b so as to mesh with each other. And some stirring blades 2
The ring-shaped support plate 21a of 0a is attached so as to be inclined in the longitudinal direction of the main body 1, and has a sending effect on the liquid to be treated. It is recommended that the angle of inclination (θ: see FIG. 3) of the support plate 21a be between 3 degrees and 60 degrees at which an appropriate feeding action is given to the liquid to be treated. In this embodiment, a scraping plate 22 is provided at the tip of each of the stirring blades 20 and 20a with the rotating shafts 3a and 3b.
And the liquid to be treated in the main body 1 is scraped and scooped up. The rotating shafts 3a and 3b rotate in opposite directions to lift the liquid inside as shown by arrows in FIG.

In FIG. 1, reference numeral 11 denotes rotating shafts 3a and 3b.
, 12 is a shaft sealing device, and 13 and 14 are an inlet and an outlet of a heat medium, respectively.

In such an apparatus, the low-viscosity liquid to be treated having a low degree of polymerization continuously supplied from the inlet nozzle 4 is stirred and renewed by a plurality of stirring blades 20 comprising a ring-shaped support plate. Under the action, the polymerization reaction is accelerated and the viscosity of the liquid also increases. Then, a ring-shaped support plate 21a of a part of the stirring blades 20a attached to be inclined in the longitudinal direction.
As a result, a feeding action in the longitudinal direction of the main body 1 is given, and the main body 1 sequentially moves to the right side in FIG. The liquid having a high viscosity is discharged from the outlet nozzle 5 to the outside of the system by a gear pump or the like (not shown).

Here, the liquid to be treated undergoes efficient stirring and surface renewal action in a cross section perpendicular to the longitudinal direction of the main body 1 by the stirring blade 20, and a ring-shaped support attached to be inclined in the longitudinal direction. By a part of the stirring blades 20a having the plate 21a, a feeding action in the longitudinal direction of the main body 1 is given, whereby the polycondensation reaction can be advanced while being sequentially moved by an extrusion flow from the inlet to the outlet of the main body 1, A high quality polymer can be efficiently produced.

When polyethylene terephthalate is polymerized by such an apparatus, an intermediate polymer of the liquid to be treated is continuously supplied from the inlet nozzle 4, and the stirring blade 20 efficiently stirs the cross section perpendicular to the longitudinal direction of the main body 1. The polycondensation reaction proceeds under the influence of the undercoating and surface renewal action, and the generated volatile matter such as ethylene glycol is evaporated and separated, and a portion of the stirring blades 20 having a ring-shaped support plate 21a attached to be inclined in the longitudinal direction.
By a, a feeding action in the longitudinal direction of the main body 1 is given, and a high-viscosity polymer is obtained. Volatile substances such as ethylene glycol separated during this time are discharged from the outlet nozzle 6. The operating conditions at this time are, for example, a liquid temperature of 260 to 300 ° C., a pressure of 0.01 to 10 kPa, and a rotation speed of 1 to 20 rpm.

When the polycarbonate is polymerized by such an apparatus, the intermediate polymer produced by the transesterification method is continuously supplied from the inlet nozzle 4 and the stirring blade 20 is effective at a cross section perpendicular to the longitudinal direction of the main body 1. The polycondensation reaction proceeds by the stirring and surface renewal action, and the generated volatiles (phenol) are evaporated and separated, and a part of the stirring blades 20a having a ring-shaped support plate 21a attached to be inclined in the longitudinal direction. Thereby, a feeding action in the longitudinal direction of the main body 1 is given, and a high-viscosity polymer is obtained. The volatiles separated during this time are discharged from the outlet nozzle 6. The operating conditions at this time are, for example, a liquid temperature of 260 to 320 ° C., a pressure of 0.01 to 10 kPa, and a rotation speed of 1 to 20 rpm.

According to a preferred embodiment of the present invention, FIG.
As shown in FIG. 2, there is a stirrer 20c having a scraper plate 22c attached to the tip of a part of the stirring blade 20c at an angle of 3 degrees to 60 degrees (inclination angle: α) with respect to the longitudinal direction of the main body. According to the present embodiment, the liquid to be treated in the main body 1 can be scraped and scooped up by the scraping plate 22c, and the liquid to be treated can be given the effect of feeding the liquid in the longitudinal direction of the main body 1. In addition to an efficient stirring and surface renewal action, the feed action in the longitudinal direction of the main body 1 is provided, so that polymerization can be performed efficiently.

According to another preferred embodiment of the present invention,
As shown in FIG. 5, there is a configuration in which a pair of spiral plates 25 is attached between some of the stirring blades 20, and the pair of spiral plates 25 mesh with each other and rotate. According to the present embodiment,
By rotating the helical plates 25 while meshing with each other, the liquid to be treated can be given a partitioning effect in the longitudinal direction of the main body 1 and a liquid sending effect, so that efficient polymerization can be performed even when the viscosity of the liquid to be treated is low. Can be.

According to still another preferred embodiment of the present invention, as shown in FIGS. 6 and 7, a partition plate 30 is provided in the main body 1 and a portion of the rotating shaft 3a,
A spiral plate (screw) 26 is attached around 3b to divide the inside of the main body 1 into a plurality of pieces in the longitudinal direction. According to the present embodiment, since the partitioning plate 30 can provide the liquid to be treated in the longitudinal direction of the main body 1 and the spiral plate 26 can provide the liquid sending effect, the viscosity of the liquid to be treated is further reduced. However, efficient polymerization can be achieved.

[0016]

According to the present invention, an efficient stirring and surface renewal effect are imparted to the liquid to be treated, and a feed action in the longitudinal direction of the main body 1 is imparted, so that a high quality polymer can be efficiently produced. .

[Brief description of the drawings]

FIG. 1 is a partial sectional plan view showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a partial cross-sectional front view showing another embodiment of the present invention.

FIG. 5 is a partial sectional plan view showing still another embodiment of the present invention.

FIG. 6 is a partial sectional front view showing still another embodiment of the present invention.

FIG. 7 is a sectional view taken along line CC of FIG. 6;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Container main body, 2 ... Heat medium jacket, 3a, 3b ... Rotating shaft, 4 ... Inlet nozzle of liquid to be processed, 5 ... Outlet nozzle of liquid to be processed, 6 ... Outlet nozzle of volatile matter, 20, 20a, 20c
... stirring blades, 21a ... inclined ring-shaped support plate, 22 ...
Scraping plate, 22c: inclined scraping plate, 25: spiral plate, 26: spiral plate (screw), 30: partition plate.

Continued on the front page (72) Inventor Kazuki Harada 794, Higashi-Toyoi, Katsumatsu-shi, Yamaguchi Prefecture F-term in Kasado Factory, Hitachi, Ltd. (reference) AB07 BA03 CB06A KE07 LA05 LA10 4J031 CA02 CA32 CE01 CF05 CG10 CG11 CG22 CG30

Claims (7)

[Claims] 1. A substantially horizontal cylindrical container body has an inlet and an outlet for a liquid to be treated at one lower end and the lower end of the other end in the longitudinal direction of the main body, and has an outlet for volatile matter at an upper part of the main body. In a device in which two rotating shafts are provided in the longitudinal direction, a plurality of stirring blades formed of a ring-shaped support plate are attached to each rotating shaft so as to mesh with each other, and the outside of the main body is covered with a heat medium jacket. A continuous polycondensation apparatus in which the stirring blade is tilted in the longitudinal direction of the main body to give an effect to the liquid to be treated. 2. The continuous polycondensation apparatus according to claim 1, wherein
Place the ring-shaped support plate of some stirring blades in the longitudinal direction of the main body.
A continuous polycondensation unit inclined between 60 and 60 degrees. 3. The continuous polycondensation apparatus according to claim 1, wherein
A continuous polycondensation apparatus in which a scraping plate inclined at an angle of 3 to 60 degrees with respect to the longitudinal direction of the main body is attached to the tip of some stirring blades. 4. The continuous polycondensation apparatus according to claim 1, wherein
A continuous polycondensation apparatus in which a pair of spiral plates are attached between some of the stirring blades, and the pair of spiral plates mesh with each other and rotate. 5. The continuous polycondensation apparatus according to claim 1, wherein
A continuous polycondensation apparatus in which a partition plate is attached to a part of the main body, and a spiral plate is attached around a rotation axis at a portion penetrating the partition plate. 6. Using the continuous polycondensation apparatus according to claim 1, a low-polymer of polyethylene terephthalate is supplied from an inlet of a liquid to be treated at a lower end of one end, and a polymer having a high viscosity as a reaction proceeds is inclined. A continuous polycondensation method for polyethylene terephthalate, which is sequentially transferred in the longitudinal direction of the main body by a stirring blade and taken out from the outlet of the liquid to be treated at the lower end of the other end. 7. A continuous polycondensation apparatus according to claim 1, wherein a low-polymer of polycarbonate is supplied from an inlet of a liquid to be treated at one lower end, and a polymer having a high viscosity as a reaction proceeds is inclined. A continuous polycondensation method for polycarbonate, which is sequentially transferred in the longitudinal direction of the main body by a blade and taken out from the outlet of the liquid to be treated at the lower end of the other end.