Reaction device for producing povidone solution

Abstract

The utility model relates to a reaction device for producing a povidone solution. The reaction kettle comprises a kettle body, a cover body and a motor assembly arranged on the cover body, an inner pipe sleeve is arranged in the kettle body, an annular cavity is defined between the inner pipe sleeve and the kettle body, a heat pipe network group is arranged in the annular cavity, a hot liquid supply pipe and a hot liquid recovery pipe are arranged on the outer wall of the kettle body, the heat pipe network group is communicated with the hot liquid supply pipe and the hot liquid recovery pipe, and paddles are arranged in the inner pipe sleeve. The blades are coaxially connected with an output shaft of the motor assembly, and the lower end of the inner pipe sleeve is communicated with the annular cavity. When the paddles rotate at a high speed, reactants can be driven to flow downwards along the inner cavity of the inner pipe sleeve while stirring, so that the reactants circularly flow between the inner cavity of the inner pipe sleeve and the annular cavity, the reactants are subjected to heat conduction when flowing through the heat pipe network group, and due to the fact that the distribution density of the heat pipe network group is large, the heat conduction efficiency is greatly improved. And the expanded surface area is far larger than the inner surface of the valve body, so that the heat transfer efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to a reaction kettle, in particular to a reaction device for producing a polyvidone solution. Background Art

[0002] Povidone generally refers to polyvinyl pyrrolidone, which is a polymer obtained by bulk polymerization, solution polymerization, homopolymerization and other methods using monomer vinyl pyrrolidone (NVP) as raw material. In the bulk polymerization preparation process, due to the high viscosity of the reaction system, the polymer is not easy to diffuse, and the heat of the polymerization reaction is not easy to remove, resulting in local overheating and other problems. Therefore, the obtained product has a low molecular weight, a high content of residual monomers, and is mostly yellow, and has little practical value. At present, the commonly used synthesis method in industry is homopolymerization, specifically, adding an initiator to the NVP solution and heating it. By adjusting the reaction conditions such as monomer concentration, polymerization temperature, and initiator dosage, PVP homopolymers with different molecular weights and different water solubilities can be obtained.

[0003] For this reason, the industry has also developed a reactor for polymerization reaction. The structure of the reactor is generally composed of a kettle body, an agitator and a motor fixed on the top of the kettle body. The kettle body is a hollow structure, and its exterior is also wrapped with a heating component for heating the reaction materials in the kettle body. Common heating components are heat pipe heating, in which hot liquid circulates, and heat is transferred to the kettle body by heat transfer, and then to the material. Therefore, the contact area between the kettle body and the material becomes a limiting factor in determining the efficiency of heat conduction. Low heat conduction efficiency will lead to a longer heating time, which will also affect production efficiency. Therefore, how to improve the efficiency of heat conduction is an urgent problem to be solved in reactors for polyvidone production. Summary of the invention

[0004] The utility model provides a reaction device for producing a polyvidone solution, which solves the problem of low heat conduction efficiency of a reaction kettle in the prior art.

[0005] The above technical problems of the utility model are mainly solved by the following technical scheme: a reaction device for producing polyvidone solution, comprising a kettle body, a cover body and a motor assembly arranged on the cover body, the cover body is provided with a feed port, the bottom of the kettle body is provided with a discharge port, the kettle body is provided with an inner pipe sleeve, an annular cavity is defined between the inner pipe sleeve and the kettle body, a heat pipe network group is provided in the annular cavity, a hot liquid supply pipe and a hot liquid recovery pipe are provided on the outer wall of the kettle body, the hot pipe network group is connected with the hot liquid supply pipe and the hot liquid recovery pipe, a paddle is provided in the inner pipe sleeve, the paddle is coaxially connected with the output shaft of the motor assembly, and a conduction arrangement is provided between the lower end of the inner pipe sleeve and the annular cavity.

[0006] The working principle of the utility model is as follows: polymerization reaction raw materials are poured into the kettle body through the feed port until the liquid level of the reaction raw materials is raised to cover the entire inner pipe sleeve, the hot liquid supply pipe and the hot liquid recovery pipe are both opened, and then the motor assembly is started to drive the blades to rotate at high speed. A huge pressure difference will be generated between the upper and lower sides of the blades. While stirring, the reactants can also be driven to flow downward along the inner cavity of the inner pipe sleeve, and then pass through the inner pipe sleeve to enter the annular cavity. Heat conduction will occur when the reactants flow through the heat pipe network group. Since the distribution density of the heat pipe network group is large, its expanded surface area is much larger than the inner surface of the valve body, so the efficiency of heat transfer is much improved, and the heated reactants flow back into the inner pipe sleeve from the upper side of the annular cavity and circulate in sequence.

[0007] Furthermore, the heat pipe network group includes a plurality of layers of heat pipes spaced apart from each other, and the heat pipes are arranged to distribute the cross-section of the entire annular cavity in the top view. The arrangement path of the heat pipes can be a continuous S-shaped, a spiral curve type, or other curve directions. As long as the heat pipes can be relatively evenly distributed in the annular cavity, it can be sufficient.

[0008] Furthermore, the adjacent heat pipes are staggered, so that the reactants are constantly disturbed by the heat pipes during the flow process, generating many tiny eddies, which further play the role of stirring the reactants.

[0009] Therefore, compared with the prior art, the utility model has the following characteristics: 1. When the paddle of the utility model rotates at a high speed, it can drive the reactants to flow downward along the inner cavity of the inner tube sleeve while stirring, so that the reactants circulate between the inner cavity of the inner tube sleeve and the annular cavity. Heat conduction will occur when the reactants flow through the heat pipe network group. Since the distribution density of the heat pipe network group is large, its expanded surface area is much larger than the inner surface of the valve body, so the efficiency of heat transfer is much improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Attached Figure 1 It is a schematic diagram of the internal structure of the utility model;

[0011] Attached Figure 2 It is a schematic diagram of the structure of the utility model after the cover body is removed;

[0012] Attached Figure 3 It is a structural diagram of the heat pipe network group. DETAILED DESCRIPTION

[0013] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0014] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0015] Example 1: See Figure 1 , Figure 2 and Figure 3 A reaction device for producing a polyvidone solution comprises a kettle body 100, a cover body 200 and a motor assembly 300 arranged on the cover body, a feed port 110 is arranged on the cover body, a discharge port 120 is arranged at the bottom of the kettle body, an inner pipe sleeve 400 is arranged in the kettle body, an annular cavity 500 is defined between the inner pipe sleeve and the kettle body, a heat pipe network group 600 is arranged in the annular cavity, a hot liquid supply pipe 700 and a hot liquid recovery pipe 800 are arranged on the outer wall of the kettle body, the heat pipe network group is connected with the hot liquid supply pipe and the hot liquid recovery pipe, a paddle 310 is arranged in the inner pipe sleeve, the paddle is coaxially connected with the output shaft of the motor assembly, and a plurality of guide ports 410 communicating with the annular cavity are arranged at the lower end of the inner pipe sleeve.

[0016] The working principle of this embodiment is as follows: polymerization reaction raw materials are poured into the kettle body through the feed port until the liquid level of the reaction raw materials is raised to cover the entire inner pipe sleeve, the hot liquid supply pipe and the hot liquid recovery pipe are both opened, and then the motor assembly is started to drive the paddle to rotate at high speed. A huge pressure difference will be generated between the upper and lower sides of the paddle. While stirring, the reactants can also be driven to flow downward along the inner cavity of the inner pipe sleeve, and then pass through the inner pipe sleeve to enter the annular cavity. Heat conduction will occur when the reactants flow through the heat pipe network group. Since the distribution density of the heat pipe network group is large, its expanded surface area is much larger than the inner surface of the valve body, so the efficiency of heat transfer is much higher, and the heated reactants flow back into the inner pipe sleeve from the upper side of the annular cavity and circulate in sequence.

[0017] See Figure 1 and Figure 2 The heat pipe network group includes 5 layers of heat pipes 610 and heat pipe positioning rings 620 that are spaced apart from each other. The heat pipes are arranged to distribute the cross-section of the entire annular cavity in the top view direction, and the arrangement path of the heat pipes is a continuous S-shape. The cross section of the heat pipe positioning ring is L-shaped, which can be fixed on the inner wall of the valve body or the outer wall of the inner pipe sleeve, and clamped and fixed on the upper and lower sides of the heat pipe, which has the function of positioning the heat pipe.

[0018] See Figure 3, adjacent heat pipes are staggered. In this way, the reactants will be constantly disturbed by the heat pipes during the flow process, generating many tiny eddies, which will further stir the reactants.

[0019] See Figure 1 The outer wall of the kettle body is wrapped with a thermal insulation layer 130 to achieve thermal insulation effect.

[0020] See Figure 1 The cover body is also provided with a monomer dripping pipe 140 and an initiator dripping pipe 150 extending into the interior of the kettle body, and both the monomer dripping pipe and the initiator dripping pipe are provided with a stop valve 160.

[0021] See Figure 1 The cover body is also provided with a thermometer 170 extending into the interior of the kettle body, and the temperature measuring end of the thermometer extends into the inner tube sleeve.

[0022] See Figure 1 The cover body is also provided with a first air pipe 180 and a second air pipe 190 which are connected to the inside of the kettle body. The first air pipe is connected to the high-pressure air source, and the second air pipe is used for exhaust. The two air pipes can be used to adjust the air pressure inside the valve body.

[0023] It is obvious to those skilled in the art that the utility model can be changed in many ways, and such changes are not considered to be out of the scope of the utility model. All such modifications obvious to those skilled in the art will be included in the scope of the claims.

Claims

1. A reaction device for producing a polyvidone solution, comprising a kettle body, a cover body, and a motor assembly arranged on the cover body, wherein the cover body is provided with a feed inlet, and the bottom of the kettle body is provided with a discharge port, characterized in that: An inner pipe sleeve is provided in the kettle body, an annular cavity is defined between the inner pipe sleeve and the kettle body, a heat pipe network group is provided in the annular cavity, a hot liquid supply pipe and a hot liquid recovery pipe are provided on the outer wall of the kettle body, the heat pipe network group is connected with the hot liquid supply pipe and the hot liquid recovery pipe, a paddle is provided in the inner pipe sleeve, the paddle is coaxially connected with the output shaft of the motor assembly, and a conduction is provided between the lower end of the inner pipe sleeve and the annular cavity.

2. The reaction device for producing a polyvidone solution according to claim 1, characterized in that: The heat pipe network group comprises a plurality of layers of heat pipes spaced apart from each other in an upper and lower direction, and the heat pipes are arranged to distribute the cross section of the entire annular cavity in a top view direction.

3. The reaction device for producing a polyvidone solution according to claim 2, characterized in that: The adjacent heat pipes are arranged staggered with each other.

4. The reaction device for producing a polyvidone solution according to claim 1, characterized in that: The outer wall of the kettle body is wrapped with a heat-insulating layer.

5. The reaction device for producing a polyvidone solution according to claim 1, characterized in that: The cover body is also provided with a monomer dropping pipe and an initiator dropping pipe extending into the interior of the kettle body, and both the monomer dropping pipe and the initiator dropping pipe are provided with stop valves.

6. The reaction device for producing a polyvidone solution according to claim 1, characterized in that: The cover body is also provided with a thermometer extending into the interior of the kettle body, and the temperature measuring end of the thermometer extends into the inner pipe sleeve.

7. The reaction device for producing a polyvidone solution according to claim 1, characterized in that: The cover body is also provided with a first air pipe and a second air pipe which are communicated with the interior of the kettle body.

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