JPH0462771B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a polymerization reactor for producing synthetic resins and synthetic fibers. This invention relates to a horizontal reactor with enhanced surface renewal performance, which is strongly required when controlling the temperature of a polymer or when cooling a polymer by spraying a solvent or water on it.

(Prior art) Horizontal type polymerization reactors have long been used as polymerization reactors with a large liquid surface area and high surface renewal performance.
For low viscosity liquids of several hundred poise or less, a uniaxial stirring polymerization vessel is common. However, when the viscosity increases as the polymerization reaction progresses and reaches tens of thousands to hundreds of thousands of poise, a twin-screw type is suitable because the viscosity liquid gets entangled with the stirring blades and rotates with the stirring blades when using a single-screw type.

An example of a horizontal twin-screw polymerization reactor is the VS
P.2758915, Special Publication Showa 35-17662, Special Publication Showa 42-16076,
Special Publication 1977-20430, GE-1917435, Japanese Patent Publication 1974-
127489, but none of them have sufficient surface area and surface renewal performance. For example, the special public official court in 1977-
In 20430, since the stirring blade has a complicated shape based on a circle, when handling a liquid with a high viscosity of 1000 poise or more, the two shafts each become cylindrical, which reduces the surface area. Also, JP-A-54-
In the device proposed by 127489, contrary to the above, the stirring blades are simplified into paddle shapes, and the stirring blades on each axis are installed so that they face each other, which is an improvement, but in this case, it is too simple. The drawback was that it became impossible to obtain a large surface area.

To explain the conventional device in more detail, Fig. 5 shows
FIG. 2 is a schematic diagram of a horizontal polymerization vessel equipped with a disc-shaped stirring blade, as typified by USP2758915. Rotating shafts 1a, 1b
are rotating in different directions, and the highly viscous polymerization liquid adheres to the surfaces of the disc-shaped stirring blades 2a and 2b installed on the rotating shaft 1, and the surface shape of the liquid becomes the shape shown in the surface line 3. . In this case, the surface area per unit liquid volume (hereinafter referred to as AV value) is clearly not large.

Next, as shown in FIG. 6, there is a case where the stirring blades are of a two-paddle type. This is JP-A-54-
This is a schematic version of what was proposed in No. 127489. Two paddle-shaped stirring blades 2a, 2b are attached to the rotating shafts 1a, 1b, and the surface shape of the liquid is as shown by the surface line 3. In this case, the AV value is larger than in FIG. 5, indicating an improvement.

Figure 7 shows the case where the number of paddles is increased to further increase the AV value, and the rotating shafts 1a, 1b
4 paddle-shaped stirring blades 2a, 2b are attached to the top. In this case, since the angle between adjacent paddles is as small as 90°, a high viscosity liquid is held between the paddles, resulting in a lower AV value than in FIG. 6, as shown by surface line 3.

(Problems to be Solved by the Invention) The present invention aims to solve the problems of the conventional device as described above. The purpose of this invention is to provide a horizontal reactor with an optimal stirring blade shape that minimizes the

(Means for Solving the Problem) To achieve this purpose, the present invention provides two horizontally installed tubes facing in different directions in a cylindrical container that is installed substantially horizontally and has a raw material supply port and a discharge port. A rotating shaft is provided, and multiple blade-type stirring blades are attached to each shaft at different positions, and the stirring blades adjacent to each other in the longitudinal direction of the same shaft are set at a 60° phase with each other. A scraping plate parallel to the longitudinal direction is attached to the outermost periphery of the stirring blade, and as it rotates, the scraping plate is attached to at least a part of the inner wall of the container and the other rotating shaft side of the stirring blade. The present invention provides a horizontal reactor having a surface renewal property characterized by moving close to its outer shape.

(Example) Next, the configuration and structure of one example of the present invention will be explained using the drawings.
The action will be explained in detail.

FIG. 1 is a horizontal sectional view of the device of the invention. Rotating shafts 1a and 1b that rotate in the directions of arrows in the figure are installed in a cylindrical container 4 that is installed substantially horizontally, and each of the rotating shafts 1a and 1b has a plurality of stirring blades 2a, 2b is attached. Furthermore, scraping plates 5a, 5b are attached to the outermost peripheries of the stirring blades 2a, 2b. The raw material liquid is supplied from the supply port 6 and moves in the longitudinal direction while being stirred and mixed by the stirring blades 2a, 2b and the scraping plates 5a, 5b, during which time the reaction proceeds. The liquid that has completed the reaction after a certain residence time is discharged from the discharge port 7.

FIG. 2 shows a cross section taken along line AA in FIG. 1. As a general rule, the rotating shafts 1a and 1b are installed horizontally. Stirring blades 2a, 2b
has a three-paddle shape, and scraping plates 5a and 5b are attached to the outer periphery of the paddle. The shape of the stirring blade 2a is determined from the outermost peripheral line 8, which is a circle centered on the rotation center, and the inner peripheral line 9, which is based on the trajectory of the scraping plates 5a1, 5a2, and 5a3 attached to the other stirring blade 2b. It's decided. The shape of the stirring blade 2b is also similar. The shape of the container 4 is determined so that the scraping plates 5a and 5b leave a slight clearance at the lower part of the container 4, so that the liquid staying in the lower part can be scraped up to the upper part.

FIG. 3 shows a cross section taken along line BB in FIG. The stirring blade 2b is the same as that shown in FIG. 2, but the stirring blade 2'a is shown next to the stirring blade 2a in FIG. The stirring blades 2a in Figure 2 and the stirring blades 2'a in Figure 3 have the same shape and are installed with a phase difference of 60°, and the installation method is common to all stirring blades. .

Furthermore, the scraping plate 5b1 attached to the stirring blade 2b has a length that can cover the position of the stirring blade 2'a in the position of the stirring blade 2'a in FIG. The scraping plates attached to longitudinally adjacent stirring blades on the rotating shaft are arranged to overlap each other in the longitudinal direction. This positional relationship can be more clearly determined from FIG. By determining the length of the scraping plate, it is possible to create a trajectory that follows the internal circumference of the other stirring blade, increasing the cleaning effect of the stirring blade and completely cleaning the inner wall at the bottom of the container. It can be scraped off.

Figure 4 shows the CC cross section in Figure 1, and the relationship between the stirring blades 2'a, 2'b and the scraping blades attached to the two rotating shafts 1a, 1b is shown in Figure 3. It is almost the same as the case.

Note that FIG. 8 is a schematic diagram of the device of the present invention in which the number of paddles is optimally set, and in comparison with the schematic diagrams of the operator's device shown in FIGS. 5 to 7, the rotating shafts 1a, 1b Three paddle-shaped stirring blades 2a and 2b are attached to the stirrer. In this case, since the angle between the adjacent paddles is as large as 120°, the high viscosity liquid is not held between the paddles as in the device shown in Fig. 7, and the surface line of the liquid along the paddle link 3 is formed. The AV value is 1.2 to 1.5 times that of the device shown in FIG.

The above schematic diagram is a plan view, and in reality, stirring blades are installed in multiple stages in the longitudinal direction of the shaft, forming a three-dimensional surface shape.
From a comparison of characteristics, the above are representative.

(Effects of the Invention) As described above, the device of the present invention causes a high viscosity liquid to react while being mixed and stirred using a stirring blade and a scraping plate, cleans the inner wall of the container and the outer shape of the stirring blade with a scraping plate, and further stirs the liquid. In addition to forming a large liquid surface with the blades and scraping plate, it can also have a surface renewal effect that exposes new surfaces one after another. expensive.

(2) The scraping plate can be used to clean the inner wall of the container and the outer shape of the stirring blade, preventing dead spaces and the formation of deposits. (3) The stirring blade has three paddles, which further shifts the phase. (4) The stirring blades act as a partition plate in the longitudinal direction, making the liquid flow in the longitudinal direction similar to a piston flow, reducing the residence time distribution. It has the following effects.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one embodiment of the device of the present invention in a longitudinal section, FIG. 2 is a sectional view taken along the line A-A in FIG. 1,
Figure 3 is a sectional view taken along line B-B in Figure 1, Figure 4 is a sectional view taken along line C-C in Figure 1, and Figures 5 to 7 schematically show the shape of the conventional device and the surface shape of high-viscosity liquid. FIG. 8 is a diagram similarly schematically representing the present surface-emitting device. 1a, 1b... Rotating shaft, 2a, 2b... Stirring blade, 4... Cylindrical container, 5a, 5b... Scraping plate, 6... Supply port, 7... Discharge port.

Claims (1)

[Claims] 1 Two horizontally installed rotating shafts that rotate in different directions are provided in a cylindrical container that is installed substantially horizontally and has a raw material supply port and a discharge port, and each rotating shaft is equipped with three blades. A plurality of stirring blades of the type are installed at different positions from each other, and adjacent stirring blades are shifted in phase by 60° in the longitudinal direction of the same rotating shaft.
A scraping plate parallel to the longitudinal direction is attached to the outermost periphery of the stirring blade, and as it rotates, the scraping plate changes the outer shape of at least a part of the inner wall of the container and the stirring blade attached to the other rotating shaft side. A horizontal reactor with surface renewability characterized by close movement.