KR20010001141A - Impeller for a tank reactor and a reactor using the same - Google Patents

Abstract

PURPOSE: An impeller for a tank-type reactor and a reactor using the impeller are provided, to allow reactants and catalyst particles to be diffused homogeneously, thereby to improve the reaction efficiency and to remove the reaction heat. CONSTITUTION: The impeller for a tank-type reactor comprises a stirring axis(10) which is connected with the power source and is rotatable; slide blades(21,22) whose blades are arranged radially and which are fixed to the stirring axis(10); a spiral blade(30) which is supported by a support axis(31) to allow the spiral blade (30) to rotate together with the slope blades(21,22) when the stirring axis(10) rotates, and ascends the inside of a reactor spirally; and optionally a curve blade(40) whose curved blades are arranged radially along the lower curvature of a reactor.

Description

Impeller for a tank reactor and a reactor using the same}

The present invention relates to an impeller for a tank type reactor, and more particularly, to impart a uniform dispersion of particle catalyst and contact with a gas phase reactant, and an impeller capable of efficiently removing reaction heat generated during a polymerization reaction. It relates to a reactor equipped with.

Gas phase polymerization using a particle catalyst is widely used in the petrochemical industry, and specifically, polyolefin polymerization using a Ziegler-Natta catalyst is exemplified. This gas phase polymerization is generally carried out in a fluidized bed type reactor or a continuous stirred tank reactor (CSTR).

In particular, in the case of using a continuous flow stirring reactor, various impellers and reactors have been proposed to improve the efficiency of the catalytic reaction. However, the conventional impeller is mainly manufactured in the shape of an anchor, so that the floating effect of the catalyst particles in the reactor is small, and the catalyst particles tend to gather in the lower part of the reactor under the influence of gravity. When the catalyst particles gather in the lower part of the reactor, the reaction takes place intensively in the lower part of the reactor, so the heat of reaction cannot be sufficiently removed, resulting in overheating. Is lowered. In addition, the resulting polymer particles become viscous due to overheating at the bottom of the reactor and can agglomerate with each other, thereby impairing the quality of the finally obtained polymer product. However, in the conventional reactor system, the heat generated during polymerization cannot be sufficiently removed, and the above problems are inevitably further expanded.

Therefore, the technical problem to be achieved by the present invention is to improve the reaction efficiency by increasing the flotation force of the catalyst particles to ensure that the reaction is uniformly carried out in the entire region in the reactor and to effectively prevent thermal accumulation under the reactor and this It is to provide a reactor equipped with.

1 is a perspective view illustrating a structure of an impeller according to an embodiment of the present invention.

2A and 2B are plan and front views of the impeller shown in FIG. 1.

Figure 3 schematically shows the structure of a reactor according to an embodiment of the present invention.

<Explanation of symbols for main parts of drawing>

10: stirring shaft

21, 22: inclined blade

30: spiral blade

31: support shaft

40: curved blade

50: cooling jacket

60: cooling coil

The present invention to achieve the above technical problem,

A rotatable stirring shaft connected to the power source;

A plurality of inclined blades disposed radially, the inclined blade fixedly mounted to the stirring shaft; And

Spiral blade coupled to the end of the inclined blade of the inclined blade and supported by a support shaft extending in parallel with the agitator shaft so as to rotate integrally with the inclined blade when the stirring shaft rotates, and spirally climbs the inner surface of the reactor. It provides an impeller for a tank-type reactor comprising a.

According to an embodiment of the present invention, it is preferable to further include a curved blade fixedly mounted to the lower end of the stirring shaft below the inclined blade, the plurality of inclined curved blades are disposed radially along the lower curved surface of the reactor.

An inclined blade mounted to a stirring shaft which is connected to a drive motor and rotates at a high speed allows the flow of fluid in the reactor to be raised in the axial direction. Therefore, in the polymerization reaction using the particle catalyst, the catalysts gathered in the lower center of the reactor may float on the flow of the fluid, which is a reactant, and rise in the upper direction of the reactor along the stirring shaft.

The helical blade attached to the outer circumference of the inclined turbine serves to float the catalyst particles which float along the stirring shaft and then descend on the reactor wall after reaching the top of the reactor.

In addition, the curved blade is mounted on the lower end of the stirring shaft and has a shape along the lower curved surface of the reactor serves to float the catalyst particles that can be collected in the lower portion of the reactor without being floated by the inclined blade.

Hereinafter, an embodiment of the present invention will be described in more detail with reference to the accompanying drawings, which are merely exemplary and the present invention is not limited thereto.

1 is a perspective view of an impeller according to an embodiment of the present invention, a pair of inclined blades 21 and 22 in a stirring shaft 10 connected to a driving motor (not shown), a spiral blade mounted on the outer circumference of the inclined blade 30 and a curved blade 40 produced along the lower curved surface of the reactor.

The inclined blades 21 and 22 are inclined at an angle of 45 ° to allow the reactant and the catalyst particles to flow upward along the stirring shaft 10 when the stirring shaft 10 is rotated. In FIG. 1, the inclined blades having four blades are mounted in two stages so that the reactant can be more strongly floated. However, the number of blades and the number of the inclined blades are not limited thereto.

Spiral blade 30 is coupled to the support shaft 31 fixed to the end of the inclined blade is integrated with the stirring shaft 10 and the inclined blade (21, 22). Accordingly, when the stirring shaft 10 is rotated, the inclined blades 21 and 22 and the spiral blades 30 rotate together, and the spiral blade 30 is lifted up to the center of the reactor by the inclined blades 21 and 22. Afterwards, the catalyst particles descending on the wall are floated again. In FIG. 1, only the case where the spiral blade support shaft 31 is installed by the number of the inclined blade blades is illustrated, but it is also possible to reduce the number of the blades to at least two or more.

The curved blade 40, which is manufactured in a shape along the curved surface of the reactor and mounted at the lower end of the stirring shaft 10, serves to float the catalyst particles gathered at the bottom of the reactor without exception, and the inclined blade 22 or the spiral blade ( If only 30) is used, it is not easy to access the bottom of the curved reactor, which completely solves the problem that dead space can be formed.

Figures 2a and 2b is a plan view and a front view of the impeller shown in Figure 1 has been attached to more clearly understand the above structure.

The reactor to which the impeller according to the present invention can be mounted is not limited to a specific type of reactor as long as it is a tank type reactor. However, a structure of a particularly preferable reactor among reactors in which the impeller according to the present invention can be mounted is schematically illustrated in FIG. 3. That is, the reactor shown in Figure 3 is a stirring shaft 10 so as not to interfere with the rotation of the cooling jacket 50 and the impeller surrounding the outside of the reactor in order to effectively remove the excess heat generated, such as polyolefin polymerization It includes a cooling coil 60 surrounding the.

In the cooling jacket 50, a cooling fluid such as water enters the inlet 51, circulates along the outer wall of the reactor, absorbs the heat of reaction, and is then discharged to the outlet 52. However, since it is difficult to effectively remove the reaction heat generated in the center of the reactor by the cooling jacket 50 alone, in the present invention, the cooling coil 60 is mounted so as not to interfere with the rotation of the stirring shaft around the stirring shaft located at the center of the reactor. ) Was used. Cooling coil 60 is secured to a reactor cover (not shown) having a coolant inlet and an outlet connected to a coolant source.

In addition, in the reactor according to one embodiment of the present invention, the reactant inlet 70 is installed in the lower center of the reactor, in particular, in the case where the reactant is a gas such as polyolefin polymerization. Therefore, the catalyst particles gathered at the bottom of the reactor may also be dispersed to the top of the reactor by the gas reactant injected into the reactor at a constant pressure.

Therefore, the impeller and the reactor according to the present invention can uniformly disperse the reactants and the catalyst particles, thereby increasing the reaction efficiency and effectively removing the heat of reaction, thereby contributing to the reduction of the production cost and the improvement of the product quality.

Claims (6)

A rotatable stirring shaft connected to the power source; A plurality of inclined blades disposed radially, the inclined blade fixedly mounted to the stirring shaft; And Spiral blade coupled to the end of the inclined blade of the inclined blade and supported by a support shaft extending in parallel with the agitator shaft so as to rotate integrally with the inclined blade when the stirring shaft rotates, and spirally climbs the inner surface of the reactor. Impeller for tank type reactor comprising a. The tank type reactor of claim 1, further comprising a curved blade fixedly mounted to the lowermost end of the stirring shaft below the inclined blade, wherein a plurality of inclined curved blades are disposed radially along a lower curved surface of the reactor. Impeller. The impeller for a tank type reactor according to claim 1, wherein the inclined blade is mounted in two stages. The impeller for a tank type reactor according to claim 1, wherein an angle of the inclined blade of the inclined blade is 45 degrees. The impeller according to any one of claims 1 to 4 is mounted, and a cooling jacket having a cooling fluid inlet and an outlet is wrapped around the outside of the reactor, and a cooling coil through which the cooling fluid can flow is provided inside the reactor. Tank-type reactor characterized in that the spirally wrapped around the stirring shaft so as not to interfere with the rotation. The tank type reactor according to claim 5, wherein a reactant inlet is provided at the center lower part of the reactor.