JPS61118122A - Stirrer - Google Patents

Abstract

PURPOSE:To increase the mixing efficiency of high-viscosity liquid by providing the spiral blades between a main body vessel and a draft tube and providing the plural sheets of thick disks which are made eccentrical for a rotary shaft of the draft tube and spirally fixed thereto. CONSTITUTION:When the high-viscosity liquid to be treated is flowed to the inside of a main body vessel 1 from a feed port 2 and the gas to be mixed into the liquid is mixed to the inside of the vessel 1 from a gas feed port 3 and a rotary shaft 10 is rotated, the spiral band blades 14 and the plural sheets of thick disks 15 are rotated together with the rotary shaft 10 in one body. Therein while the liquid incorporated in a draft tube 6 is sheared by the rotation of the plural sheets of thick disks 15, it is moved in the upper direction and flowed out to the cylindrical space 12 from an aperture 7 of upper end. On the other hand, the liquid incorporated in the cylindrical space 12 is pushed down to the lower part by the rotation of the spiral band blade 14 and returned to the inside of the draft tube 6 through an aperture 8 at the lower end thereof.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is useful for aerating gas into a liquid substance and stirring and mixing it to obtain a uniform product, or for producing a polymer compound under stirring conditions. This invention relates to a stirring device used in reactions.

[Prior art and problems to be solved by the invention] There are many types of stirring devices. For low viscosity liquids, the prover, turbine, paddle, etc. are generally used, and for high viscosity liquids, the spiral zone II (helical ribbon wings), screw wings, anchor-shaped wings, etc. are commonly used.

In particular, high viscosity liquids, which are often handled in the manufacturing process of polymer compounds, require a longer mixing time r1 than low viscosity liquids, so the quality of the product will be affected by the selection of the stirring device, so care must be taken. It is something. In addition, in the case of high viscosity liquids, a large amount of stirring power is required, so
It is also necessary to select efficient equipment from the viewpoint of power saving.

Furthermore, in a process in which gas is passed through a highly viscous liquid and absorbed into the liquid, it is important not only to mix the liquids but also to disperse the gas in the liquid.

From the standpoint of mixing efficiency, the functions required to efficiently separate the gas into the liquid are: ■ A function that allows the liquid to flow throughout the entire tank ■ A function that disperses the gas in the liquid over the entire area within the tank ■ The liquid This is a function that promotes macro-replacement.

By the way, when considering the above three functions of conventional stirring devices, those with spiral band blades and screw blades with draft chew 7 satisfy the function (■), but the function (■) is small;
The functionality is moderate. Moreover, the one between the anchor shapes does not satisfy any of the functions (■) to (■).

For this reason, it has been desired to develop a stirring device that can efficiently mix high viscosity liquids and disperse gas into high viscosity liquids.

The purpose of the present invention is to achieve the above three functions: (1) a function to flow the liquid throughout the entire tank; (2) a function to disperse gas in the liquid throughout the tank; (2) a function to promote macroscopic exchange of the liquid. The object of the present invention is to provide a satisfactory stirring device.

[Means for solving problems]

In order to achieve the above object, the stirring device of the present invention has a cylindrical main body that has a supply port and a discharge port for a liquid substance, a gas supply port at the bottom, and is installed with its axis oriented in the vertical direction. A container, a cylindrical draft tube provided concentrically with the container within the main container and having upper and lower ends open, a rotating ring rotatably provided at the axial center position of the draft tube, and the rotating shaft. a spiral band blade supported by the main container and arranged in a dark cylindrical space between the main body container and the draft tube; and a plurality of thick blades fixed to the rotation shaft so as to be eccentrically arranged in different directions in a spiral arrangement. It is characterized by comprising a meat disc.

(Effects of the Invention) In the above configuration, the circulation function of the spiral band blade is strengthened by the plurality of thick discs provided in the draft tube, and the function (2) is fully satisfied.

In addition, the plurality of thick-walled discs increases the shearing rate of the liquid passing through the draft tube.
functions are enhanced.

Furthermore, the liquid in the draft tube flows vertically while being subjected to strong shear due to the rotation of multiple thick-walled discs, so the liquid in the draft tube is mixed efficiently, and the function (■) is also achieved. It will be completely satisfying.

[Embodiments of the invention]

The figures show one embodiment of the present invention, the first factor being a longitudinal sectional view of a stirring device, and the second being a sectional view taken along the line If-II in FIG.

The main container 1 has a cylindrical shape and is installed with its axis oriented in the vertical direction. The main body container 1 has a liquid substance supply port 2 and a gas supply port 3 at the bottom, and a liquid substance discharge port 5 at the lid 4.

A cylindrical draft tube 6 is housed inside the main body container 1, concentrically with the container 1.

The draft tube 6 has upper and lower ends open (a lower end between the upper ends, a lower end opening 8), and its lower end is fixed to the inner bottom of the main container 1 via a plurality of legs 9. Further, a rotating shaft 1o is provided inside the draft tube 6 at its axial center position, and this rotating shaft 1o is rotatably supported at the center of the lid portion 4. An arm 11 is fixed to the rotary wheel 1o at a position slightly above the draft tube 6 with its central portion oriented in the horizontal direction. The upper ends of two support rods 13 located in the cylindrical space 12 between the main body container 1 and the draft tube 6 are fixed to both ends of the arm 11. Two spiral band blades 14 located within the cylindrical space 12 are supported.

On the other hand, a plurality of thick disks 15 are fixed to the rotary wheel 10 at positions within the draft tube 6. These plurality of discs 15 are all fixed at their eccentric positions to the rotating shaft 1o, and their eccentric directions are sequentially shifted in the circumferential direction so that they are arranged in a spiral shape opposite to the spiral band l1I114. . Further, each of the thick disks 15 has a pitch of 11 in the circumferential direction! ! It is possible.

Next, the effect will be explained.

First, the high viscosity liquid to be treated is supplied from the supply port 2 to the main container 1.
When the gas to be mixed into the liquid is caused to flow into the main body container 1 from the gas supply port 3 and the rotating shaft 10 is rotated, a spiral band l114 and a plurality of sheets are formed together with the rotating shaft 10. The thick disk 15 rotates. Therefore, the liquid in the draft tube 6 moves upward while being sheared by the rotation of the plurality of thick disks 15, and moves upward from the lower end of the cylinder. It flows out to 12. On the other hand, the cylindrical space 1
The liquid in the draft tube 2 is pushed downward by the rotation of the spiral band blade 14, and is returned into the draft tube 6 through its lower end opening 8.

Furthermore, since the liquid in the main body container 1 is sheared by the rotation of the thick disk 15, the gas introduced from the gas supply port 3 becomes fine bubbles that rise inside the draft tube '6 and enter the liquid. It gets absorbed. A small amount of gas remaining in the form of fine bubbles without being absorbed flows out into the cylindrical space 12 from the upper end opening 11 of the draft tube 6 and is completely absorbed into the liquid while being stirred by the spiral band blades 14. It turns out.

In the above configuration, the liquid in the main body container 1 is strongly circulated by the spiral band blades 14 and the plurality of thick disks 15,
The function (2) above, that is, the function of causing the liquid to flow throughout the entire interior of the main body container 1, is fully satisfied.

In addition, the plurality of thick disks 15 increase the shearing rate of the liquid passing through the draft tube 6, thereby achieving the function (2) above, that is, uniformly dispersing gas in the liquid throughout the entire interior of the main container 1. Functionality is enhanced.

Roughly speaking, the liquid in the draft tube 6 flows vertically upward while being subjected to strong shear due to the rotation of the plurality of thick disks 15, so that the liquid in the draft tube 6 is efficiently stirred. , (2), that is, the function of promoting macroscopic exchange of liquid, is also fully satisfactory.

Next, a comparison was made between a conventional spiral band blade type stirring device [Experimental Example 1] and a stirring device [Experimental Example 2] prepared based on the above-mentioned example, and the following results were obtained.

[Experimental Example 1] The real hemp container was made of transparent acrylic with an inner diameter of 30,079 m and a width of 550 am, and the spiral band blades had a blade diameter of 294 mg + 1 function width of 30.
The spiral pitch is 30011II11 and the height is 450aw. The liquid was a NazSO3 solution having a viscosity of 100 poise, and the spiral band blade was rotated at 60 rpm while blowing air through the gas supply port.

The liquid is sampled every certain period of time, and the So
When the overall mass transfer coefficient Kaa was determined by measuring the concentration of 3, it was Kga-0.2.

[Experimental Example 2] A draft tube 6 with an outer diameter of 200 am, an inner diameter of 180 am, and a height of 450 mm was added to the apparatus of Experimental Example 1, and
A device based on the above example was created by adding a plurality of thick disks 15 with a wall thickness of 30M and a diameter of 140ai at a pitch of 60° in the circumferential direction, and the conditions such as liquid, rotation speed, supply gas, etc. were the same as in Experimental Example 1. The temperature of 80,311 degrees in the sampled liquid was measured at intervals of a certain period of time, and the overall mass transfer coefficient Koa was determined to be KQa-0.7.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view of a stirring device, and FIG. 2 is a cross-sectional view taken along the line 1--2 in FIG. 1... Main body container, 2... Liquid substance supply port, 3...
・Gas supply port, 5... Discharge port, 6... Draft tube, 7... Upper end opening, 8... Lower end opening, 10...
・Rotating shaft, 14... Spiral band blade, 15... Thick-walled cylinder.

Claims (1)

[Claims] A cylindrical main body container having a supply port and a discharge port for a liquid substance, a gas supply port at the bottom, and installed with its axis facing the vertical direction; a cylindrical draft tube with open upper and lower ends; a rotary shaft rotatably provided at the axial center position of the draft tube; and a cylinder supported by the rotary shaft between the main container and the draft tube. A stirring device comprising: a spiral band blade arranged in a space; and a plurality of thick disks fixed to the rotating shaft so as to be eccentric in different directions and arranged in a spiral shape. .