A high-efficiency reaction kettle for PVB resin synthesis

Abstract

This utility model relates to the field of resin synthesis technology, specifically to a high-efficiency reactor for PVB resin synthesis. The high-efficiency reactor for PVB resin synthesis is configured for a synthesis reaction with reactant viscosities above 3000 mPa·s. The reactor includes a reactor body, a stirring shaft, a drag-reducing element, and a stirring element. The stirring shaft is disposed inside the reactor body and drives the stirring element to stir the reactants. The drag-reducing element is configured to reduce the resistance generated by the reactants on the stirring element and / or to reduce the resistance generated by the inner wall of the reactor body on the reactants. This high-efficiency reactor for PVB resin synthesis effectively reduces resistance during stirring, reduces energy consumption during PVB resin synthesis, and helps improve the efficiency and purity of PVB resin synthesis.

Description

Technical Field

[0001] This utility model relates to the field of resin synthesis technology, and specifically to a high-efficiency reaction vessel for PVB resin synthesis. Background Technology

[0002] PVB resin synthesis is a chemical product obtained through a batch reactor process. The reactor is one of the conventional pieces of equipment for PVB resin synthesis. To accelerate the reaction and ensure uniform mixing of the materials, a stirring device is typically installed inside the reactor. Usually, the stirring device required for PVB resin synthesis is a paddle or propeller-type agitator.

[0003] However, the materials used in PVB resin synthesis are generally highly viscous. When using paddle or propeller blades for stirring, the viscous materials will generate significant resistance, resulting in high energy consumption for stirring. At the same time, it will also cause significant differences in the stirring effect in different parts of the reactor, resulting in inconsistent reactions throughout the reactor and affecting the synthesis efficiency and purity of PVB resin.

[0004] To address the above issues, there is an urgent need to invent a high-efficiency reactor for PVB resin synthesis, which would solve the problems of high energy consumption and uneven stirring in existing reactors, resulting in low efficiency in PVB resin synthesis. Utility Model Content

[0005] This invention provides a high-efficiency reactor for PVB resin synthesis, aiming to solve the problems of high energy consumption and low PVB resin synthesis efficiency in existing reactors.

[0006] To solve the above technical problems, the present invention adopts the following technical solution.

[0007] A high-efficiency reactor for PVB resin synthesis is disclosed. The reactor is configured for a synthesis reaction in which the viscosity of the reactants is above 3000 mPa·s. The reactor includes a reactor body, a stirring shaft, a drag-reducing element, and a stirring element. The stirring shaft is disposed inside the reactor body and drives the stirring element to stir the reactants. The drag-reducing element is configured to reduce the resistance generated by the reactants on the stirring element and / or the drag-reducing element is configured to reduce the resistance generated by the inner wall of the reactor body on the reactants.

[0008] According to the above-described high-efficiency reactor for PVB resin synthesis, the drag-reducing element includes a first drag-reducing element, which is configured to reduce the resistance of the reactor body sidewall and bottom wall to the reactants when the stirring element stirs the reactants.

[0009] According to the above-described high-efficiency reactor for PVB resin synthesis, the drag-reducing element includes a second drag-reducing element configured to reduce the resistance generated by the reactants on the stirring element.

[0010] According to the above-described high-efficiency reactor for PVB resin synthesis, the first drag-reducing element is a U-shaped frame structure, and the gap between the outer frame wall of the U-shaped frame structure and the side wall or bottom wall of the reactor body is no greater than 6 mm.

[0011] According to the above-described high-efficiency reactor for PVB resin synthesis, the bottom frame of the U-shaped frame is provided with a clearance portion, which protrudes into the interior of the U-shaped frame.

[0012] According to the above-described high-efficiency reactor for PVB resin synthesis, a discharge device is provided at the bottom of the reactor body, and the axis of the discharge inlet of the discharge device coincides with the axis of the reactor body; and / or, the axis of the reactor body coincides with the axis of the stirring shaft.

[0013] According to the above-described high-efficiency reactor for PVB resin synthesis, the second drag-reducing element is a ribbon-type blade, and there are two ribbon-type blades in total;

[0014] in:

[0015] One end of a spiral blade is connected to the upper end of one side of the U-shaped frame, and the other end is connected to the lower end of the other side of the U-shaped frame.

[0016] One end of another spiral blade is connected to the lower end of the U-shaped frame, and the other end is connected to the upper end of the other vertical frame of the U-shaped frame.

[0017] According to the above-described high-efficiency reactor for PVB resin synthesis, the stirring element is a stirring blade, and the angle between the plane where the stirring blade is located and the horizontal plane is 30°-60°.

[0018] According to the above-described high-efficiency reactor for PVB resin synthesis, the stirring shaft is connected to a transmission device, the transmission device is located at the top of the reactor body, the lower end of the stirring shaft is connected to the bottom frame of the U-shaped frame; and / or, the two ends of the stirring blades are respectively connected to the two vertical frames of the U-shaped frame.

[0019] According to the above-described high-efficiency reactor for PVB resin synthesis, the U-shaped frame includes a rigid part and a flexible part, the flexible part being close to the side wall or bottom wall of the reactor body.

[0020] Compared with the prior art, the present invention has the following technical effects:

[0021] This invention provides a high-efficiency reactor for PVB resin synthesis, comprising a reactor body, a drag-reducing element, and a stirring element. The drag-reducing element is configured to reduce the resistance generated by the reactants on the stirring element and / or the drag-reducing element is configured to reduce the resistance generated by the inner wall of the reactor body on the reactants. This reactor is suitable for PVB synthesis reactions with reactant viscosities above 3000 mPa·s. It can effectively reduce resistance during stirring, reduce energy consumption in the PVB resin synthesis process, and help improve the efficiency and purity of PVB resin synthesis.

[0022] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This invention presents a schematic diagram of a high-efficiency reaction vessel structure for PVB resin synthesis. Figure 2 This invention provides a schematic diagram of the first drag-reducing element in a high-efficiency reactor for PVB resin synthesis; in the diagram:

[0025] 1. Reactor body; 2. Stirring shaft; 3. Drag-reducing element; 4. Stirring element; 31. First drag-reducing element; 32. Second drag-reducing element; 310. Clearance part; 11. Discharge device; 110. Discharge inlet; 5. Transmission device; 311. Rigid part; 312. Flexible part. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0027] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0028] In the description of this utility model, it should be understood that the use of terms such as "first" and "second" to define the components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this utility model.

[0029] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0030] Please see Figure 1-2 A high-efficiency reactor for PVB resin synthesis is disclosed. The reactor is configured for a synthesis reaction of reactants with a viscosity of 3000 mPa·s or higher. The reactor includes a reactor body 1, a stirring shaft 2, a drag-reducing element 3, and a stirring element 4. The stirring shaft 2 is disposed inside the reactor body 1 and drives the stirring element 4 to stir the reactants. The drag-reducing element 3 is configured to reduce the resistance of the reactants to the stirring element 4 and / or the drag-reducing element is configured to reduce the resistance of the inner wall of the reactor body 1 to the reactants. Specifically, PVB synthesis involves the condensation of polyvinyl alcohol (PVA) dissolved in water with the addition of n-butyraldehyde under acidic conditions. PVA, when dissolved in water, has a high viscosity, generating significant resistance to the stirring shaft. Simultaneously, significant resistance arises between the inner wall of the reactor and the high-viscosity reactants (the PVA aqueous solution and various added reactants), necessitating substantial stirring force. Furthermore, relying solely on the stirring shaft makes it difficult to achieve uniform stirring of reactants located far from the shaft (e.g., near the inner wall of the reactor or in the center), leading to incomplete reactions and affecting the reaction rate. This invention incorporates a drag-reducing element inside the reactor to lower the resistance during stirring. This element also assists in stirring, further improving the uniformity of the mixture. In PVB synthesis, the viscosity of the reactants typically exceeds 3000 mPa·s, and for some special-function PVB powders, the viscosity can sometimes exceed 10000 mPa·s. Therefore, the reactor in this invention is suitable for synthesis reactions with reactant viscosities above 3000 mPa·s.

[0031] In one specific embodiment, the drag-reducing element 3 includes a first drag-reducing element 31, which is configured to reduce the resistance of the side wall and bottom wall of the reactor body 1 to the reaction material when the stirring element 4 stirs the reaction material.

[0032] In one specific embodiment, the drag-reducing element 3 includes a second drag-reducing element 32, which is configured to reduce the resistance generated by the reactants on the stirring element 4.

[0033] In one specific embodiment, the first resistance-reducing element 31 is a U-shaped frame structure, and the gap between the outer frame wall of the U-shaped frame structure and the side wall or bottom wall of the reactor body 1 is no greater than 6 mm. For example, the gap between the outer frame wall of the U-shaped frame structure and the side wall or bottom wall of the reactor body 1 is 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, or 6 mm. Preferably, the gap between the outer frame wall of the U-shaped frame structure and the side wall or bottom wall of the reactor body 1 is 3 mm-6 mm. A smaller gap is not necessarily better; if the gap is too small, it will increase the stirring resistance and cause wear to the U-shaped frame structure.

[0034] In one specific embodiment, a clearance portion 310 is provided in the middle of the bottom frame of the U-shaped frame, and the clearance portion 310 protrudes into the interior of the U-shaped frame. A discharge device 11 is provided at the bottom of the reactor body 1, and the axis of the discharge inlet 110 of the discharge device 11 coincides with the axis of the reactor body 1; and / or, the axis of the reactor body (1) coincides with the axis of the stirring shaft (2). Specifically, the clearance portion corresponds to the discharge inlet, and the clearance portion is provided so that the product can be smoothly discharged from the discharge inlet after the reaction is completed. The cross-sectional shape of the clearance portion is circular arc, elliptical arc, square, triangular and trapezoidal, etc. In order to further increase the smoothness of discharge, the clearance portion is preferably circular arc or elliptical arc. At the same time, the connection between the clearance portion and the bottom frame of the U-shaped frame structure is arc-shaped. In order to balance the stirring force during stirring, the axis of the discharge port 110 of the discharge device 11, the axis of the reactor body 1 and the axis of the stirring shaft 2 coincide.

[0035] In one specific embodiment, the second resistance-reducing element 32 is a ribbon blade, and there are two ribbon blades in total;

[0036] in,

[0037] One end of a spiral blade is connected to the upper end of one side of the U-shaped frame, and the other end is connected to the lower end of the other side of the U-shaped frame.

[0038] One end of another helical ribbon blade is connected to the lower end of the U-shaped frame, and the other end is connected to the upper end of the other side of the vertical frame of the U-shaped frame; specifically, the perpendicular angle between the helical ribbon blades and the horizontal plane gradually increases from the middle to both ends, and the two helical ribbon blades are symmetrical about the stirring axis. Alternatively, the two helical ribbon blades are centrally symmetrical. Figure 2 As shown, the two stirring shafts are centrally symmetrical.

[0039] In one specific embodiment, the stirring element 4 is a stirring blade, and the angle between the plane where the stirring blade is located and the horizontal plane is 30°~60°. For example, the angle between the plane where the stirring blade is located and the horizontal plane is 30°, 35°, 40°, 45°, 50°, 55°, 60°, etc. Preferred, the angle between the plane where the stirring blade is located and the horizontal plane is 43°~47°, and the optimal angle is 45°.

[0040] In one specific embodiment, the stirring shaft 2 is connected to the transmission device 5, which is located at the top of the reactor body 1. The lower end of the stirring shaft 2 is connected to the bottom frame of the U-shaped frame; and / or, the lower end of the stirring shaft (2) is connected to the bottom frame of the U-shaped frame; and / or, the two ends of the stirring blades are respectively connected to the two vertical frames of the U-shaped frame. It can be understood that in order for the U-shaped frame structure to rotate, the U-shaped frame structure is directly connected to the stirring shaft, for example, the bottom frame of the U-shaped frame structure is connected to the lower end of the stirring shaft; the U-shaped frame structure can also be indirectly connected to the stirring shaft, for example, the U-shaped frame structure is connected to the stirring shaft through the stirring blades, that is, the U-shaped frame structure is connected to the stirring blades, and the stirring blades are connected to the stirring shaft. It should be noted that the U-shaped frame structure can be directly connected to the stirring shaft, indirectly connected to the stirring shaft, or connected to both the stirring shaft directly and indirectly simultaneously. That is, the bottom frame of the U-shaped frame structure is connected to the lower end of the stirring shaft, while the two ends of the stirring blades are free ends and are not connected to the two vertical frames of the U-shaped frame structure; or, the two ends of the stirring blades are connected to the two vertical frames of the U-shaped frame structure, but the bottom frame of the U-shaped frame structure is not connected to the lower end of the stirring shaft; or, the two ends of the stirring blades are connected to the two vertical frames of the U-shaped frame structure, and the bottom frame of the U-shaped frame structure is connected to the lower end of the stirring shaft.

[0041] In one specific embodiment, the U-shaped frame includes a rigid part 311 and a flexible part 312, the flexible part being close to the side wall or bottom wall of the reactor body 1. Specifically, the flexible part is made of a polymer material, such as polytetrafluoroethylene (PTFE), which can scrape off highly viscous wall-attached materials without damaging the inner wall of the reactor body; the rigid part is made of a metal material, such as steel, but preferably stainless steel to meet corrosion and rust resistance requirements. Other components in this invention that come into contact with the reactants are generally made of stainless steel, while components that do not come into contact with the reactants are preferably made of stainless steel. However, for cost savings, components that do not come into contact with the reactants can be made of low-cost steel materials such as carbon steel or alloy steel.

[0042] The high-efficiency reactor for PVB resin synthesis provided by this utility model has a first drag-reducing element with a U-shaped frame structure on the stirring shaft. The left and right vertical frames of the U-shaped frame can drive the material near the inner wall of the reactor to rotate during rotation. At the same time, the vertical frames have a wall-scraping function to prevent the material from sticking to the wall. The spiral blades can improve the radial and circumferential stirring effect while reducing resistance, and improve the shearing and mixing effect on high-viscosity materials. The stirring blades (paddle blades) have an angle of 45°, which can improve the axial stirring effect.

[0043] The above description is only an exemplary embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A high-efficiency reaction vessel for PVB resin synthesis, characterized in that, The reactor is configured for a synthesis reaction in which the viscosity of the reactants is above 3000 mPa·s. The reactor includes a reactor body (1), a stirring shaft (2), a drag-reducing element (3), and a stirring element (4). The stirring shaft (2) is located inside the reactor body (1), and the stirring shaft (2) drives the stirring element (4) to stir the reactants. The drag-reducing element (3) is configured to reduce the resistance of the reactants to the stirring element (4) and / or the drag-reducing element is configured to reduce the resistance of the inner wall of the reactor body (1) to the reactants.

2. The high-efficiency reaction vessel for PVB resin synthesis according to claim 1, characterized in that, The drag-reducing element (3) includes a first drag-reducing element (31), which is configured to reduce the resistance of the side wall and bottom wall of the reactor body (1) to the reaction material when the stirring element (4) stirs the reaction material.

3. The high-efficiency reaction vessel for PVB resin synthesis according to claim 2, characterized in that, The drag-reducing element (3) includes a second drag-reducing element (32), which is configured to reduce the resistance of the reactants to the stirring element (4).

4. The high-efficiency reaction vessel for PVB resin synthesis according to claim 3, characterized in that, The first resistance-reducing element (31) is a U-shaped frame structure, and the gap between the outer frame wall of the U-shaped frame structure and the side wall or bottom wall of the reactor body (1) is no more than 6 mm.

5. The high-efficiency reaction vessel for PVB resin synthesis according to claim 4, characterized in that, The bottom frame of the U-shaped frame is provided with a clearance part (310) in the middle, and the clearance part (310) protrudes into the interior of the U-shaped frame.

6. A high-efficiency reaction vessel for PVB resin synthesis according to claim 1 or 5, characterized in that, The bottom of the reactor body (1) is provided with a discharge device (11), the axis of the discharge inlet (110) of the discharge device (11) coincides with the axis of the reactor body (1), and / or the axis of the reactor body (1) coincides with the axis of the stirring shaft (2).

7. The high-efficiency reaction vessel for PVB resin synthesis according to claim 4, characterized in that, The second resistance-reducing element (32) is a ribbon blade, and there are two ribbon blades in total; in, One end of a spiral blade is connected to the upper end of one side of the U-shaped frame, and the other end is connected to the lower end of the other side of the U-shaped frame. One end of another spiral blade is connected to the lower end of the U-shaped frame, and the other end is connected to the upper end of the other side of the vertical frame of the U-shaped frame.

8. The high-efficiency reaction vessel for PVB resin synthesis according to claim 4, characterized in that, The stirring element (4) is a stirring blade, and the angle between the plane on which the stirring blade is located and the horizontal plane is 30°-60°.

9. A high-efficiency reaction vessel for PVB resin synthesis according to claim 8, characterized in that, The stirring shaft (2) is connected to the transmission device (5), and the transmission device (5) is located at the top of the reactor body (1); The lower end of the stirring shaft (2) is connected to the bottom frame of the U-shaped frame; and / or, the two ends of the stirring blade are respectively connected to the two vertical frames of the U-shaped frame.

10. A high-efficiency reaction vessel for PVB resin synthesis according to claim 4, characterized in that, The U-shaped frame includes a rigid part and a flexible part, with the flexible part close to the side wall or bottom wall of the reactor body (1).

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