Pretreatment device for glue solution and flocculation and stripping kettle

Abstract

The utility model discloses a kind of glue liquid pretreatment device and flocculation stripping kettle, it is related to rubber manufacturing technical field, wherein, the glue liquid pretreatment device is used for flocculation stripping kettle, the glue liquid pretreatment device includes inner tube, outer tube and flow guide piece.In the technical scheme provided in the utility model, the flow of the heating medium is facilitated by the annular channel, the heating medium is directly acted on glue liquid by the action of heat conduction and heat convection, so that the glue liquid is heated and converted into gas phase, the partial pressure of solvent in glue liquid is reduced to promote the separation of solvent, and the purpose of rapid separation of solvent is achieved;By the setting of the flow guide piece, the flow direction of the heating medium is changed when flowing through the flow guide piece, resulting in the formation of velocity gradient between the heating medium and the surface of the flow guide piece inside the heating medium and the heating medium, thereby producing shear effect on glue liquid, and then achieving the purpose of rapid dispersion of glue liquid.

Description

Technical Field

[0001] This utility model relates to the field of rubber manufacturing technology, and in particular to a rubber solution pretreatment device and a flocculation stripping kettle. Background Technology

[0002] Ethylene propylene diene monomer (EPDM) rubber is a high-molecular-weight elastomer formed by the random copolymerization of three components. In the solution polymerization process for producing EPDM rubber, the flocculation stripping reactor is a key piece of equipment that plays an important role in production. It mainly uses "flocculation" to precipitate the polymer from the solvent to form solid particles, and then uses "stripping" to efficiently evaporate and remove the solvent (such as hexane) from the surface and interior of the particles, thereby achieving the separation of the polymer and the solvent and obtaining wet solid polymer particles, which provide raw materials for subsequent drying, granulation and other processes.

[0003] However, due to the high viscosity of the adhesive and the strong interaction between the polymer and the solvent, the main existing solutions include using dispersant-assisted wet coagulation technology. To address the problem of easy agglomeration of rubber particles during coagulation, related technologies improve this by adding a dispersant to the ethylene propylene rubber adhesive. The water-soluble dispersant is first dissolved in water, added to the receiving tank and mixed with hot water before entering the coagulation tank. The ethylene propylene rubber adhesive is also injected into the coagulation tank. However, there are problems such as limited solvent removal efficiency and uneven dispersion of the adhesive. Utility Model Content

[0004] The main purpose of this invention is to provide a pretreatment device for adhesive solution and a flocculation stripping kettle, which aims to achieve rapid separation of solvent and full dispersion of adhesive solution.

[0005] To achieve the above objectives, the present invention proposes a pretreatment device for a flocculation stripping reactor, comprising: An inner cylinder having a first inlet and a first outlet, the inner cylinder being used to contain adhesive liquid; An outer cylinder, fitted over the inner cylinder and spaced apart to form an annular channel, has a second inlet and a second outlet. The second inlet communicates with the annular channel for connecting a heating medium, and the second outlet communicates with the first outlet and the annular channel. A flow guide is arranged around the inner wall of the outer cylinder and located below the first discharge port to change the flow direction of the heating medium in the annular channel.

[0006] In one embodiment, the flow guide has a guide ramp through which the heating medium can flow.

[0007] In one embodiment, the inner cylinder has a first end and a second end disposed opposite to each other along its axial direction, the first end being provided with a first flange; the adhesive pretreatment device further includes: A first flange is fitted onto the outside of the outer cylinder; and, A sealing element is fixed between the first flange and the first flange.

[0008] In one embodiment, the adhesive pretreatment device further includes a sealing gasket disposed between the outer cylinder and the first flange.

[0009] In one embodiment, the second end is provided with a baffle, and the baffle has multiple through holes.

[0010] In one embodiment, the outer cylinder is provided with a second flange on its exterior, and the adhesive pretreatment device further includes a second flange, which is sleeved on the exterior of the outer cylinder and contacts the second flange.

[0011] In one embodiment, the adhesive pretreatment device further includes a connecting cylinder arranged radially along the outer cylinder and communicating with the second feed port.

[0012] In one embodiment, a third flange is provided on the side of the connecting cylinder away from the outer cylinder, and the adhesive pretreatment device further includes a third flange, which is sleeved on the outside of the connecting cylinder and contacts the third flange.

[0013] In one embodiment, at least one of the inner cylinder, the outer cylinder, and the flow guide is made of stainless steel.

[0014] This utility model also proposes a flocculation stripping kettle, including the above-mentioned adhesive pretreatment device, wherein the adhesive pretreatment device includes: An inner cylinder having a first inlet and a first outlet, the inner cylinder being used to contain adhesive liquid; An outer cylinder, fitted over the inner cylinder and spaced apart to form an annular channel, has a second inlet and a second outlet. The second inlet communicates with the annular channel for connecting a heating medium, and the second outlet communicates with the first outlet and the annular channel. A flow guide is arranged around the inner wall of the outer cylinder and located below the first discharge port to change the flow direction of the heating medium in the annular channel.

[0015] The technical solution of this utility model forms an annular channel through the interlayer between the inner cylinder and the outer cylinder, facilitating the flow of the heating medium. When the adhesive enters from the first inlet, the heating medium simultaneously enters from the second inlet. The heating medium acts directly on the adhesive through heat conduction and heat convection, causing the adhesive to be heated and converted into a gas phase, reducing the partial pressure of the solvent in the adhesive to promote solvent separation and achieve rapid solvent separation. The flow guide changes the flow direction of the heating medium as it flows through the guide, resulting in a velocity gradient between the heating medium and the surface of the guide, thereby generating a shearing effect on the adhesive and achieving rapid dispersion of the adhesive, which is beneficial for subsequent flocculation and stripping processes. Attached Figure Description

[0016] 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 the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the adhesive pretreatment device provided by this utility model.

[0018] Explanation of icon numbers: 100. Adhesive pretreatment device; 1. Inner cylinder; 11. First feed inlet; 12. First discharge outlet; 13. First end; 131. First flange; 14. Second end; 141. Baffle; 2. Outer cylinder; 21. Second feed inlet; 22. Second discharge outlet; 3. Annular channel; 4. Guide component; 5. First flange; 6. Sealing component; 7. Sealing gasket; 8. Second flange; 9. Second flange; 10. Connecting cylinder; 11. Third flange; 12. Third flange.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0022] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0023] Ethylene propylene diene monomer (EPDM) rubber is a high-molecular-weight elastomer formed by the random copolymerization of three components. In the solution polymerization process for producing EPDM rubber, the flocculation stripping reactor is a key piece of equipment that plays an important role in production. It mainly uses "flocculation" to precipitate the polymer from the solvent to form solid particles, and then uses "stripping" to efficiently evaporate and remove the solvent (such as hexane) from the surface and interior of the particles, thereby achieving the separation of the polymer and the solvent and obtaining wet solid polymer particles, which provide raw materials for subsequent drying, granulation and other processes.

[0024] However, due to the high viscosity of the adhesive and the strong interaction between the polymer and the solvent, the main existing solutions include using dispersant-assisted wet coagulation technology. To address the problem of easy agglomeration of rubber particles during coagulation, related technologies improve this by adding a dispersant to the ethylene propylene rubber adhesive. The water-soluble dispersant is first dissolved in water, added to the receiving tank and mixed with hot water before entering the coagulation tank. The ethylene propylene rubber adhesive is also injected into the coagulation tank. However, there are problems such as limited solvent removal efficiency and uneven dispersion of the adhesive.

[0025] This invention proposes a pretreatment device for adhesive solution and a flocculation stripping kettle, which aims to achieve rapid separation of solvent and full dispersion of adhesive solution.

[0026] Please see Figure 1In one embodiment of this utility model, the adhesive pretreatment device 100 is used in a flocculation stripping reactor. The adhesive pretreatment device 100 includes an inner cylinder 1, an outer cylinder 2, and a flow guide 4. The inner cylinder 1 has a first inlet 11 and a first outlet 12, and is used to contain the adhesive. The outer cylinder 2 is sleeved outside the inner cylinder 1 and spaced apart from the inner cylinder 1 to form an annular channel 3. The outer cylinder 2 has a second inlet 21 and a second outlet 22. The second inlet 21 is connected to the annular channel 3 and is used to connect the heating medium. The second outlet 22 is connected to the first outlet 12 and the annular channel 3. The flow guide 4 is arranged around the inner wall of the outer cylinder 2 and is located below the first outlet 12 to change the flow direction of the heating medium in the annular channel 3.

[0027] The technical solution of this utility model forms an annular channel 3 through the interlayer between the inner cylinder 1 and the outer cylinder 2, which facilitates the flow of the heating medium. When the adhesive enters from the first inlet 11, the heating medium simultaneously enters from the second inlet 21. The heating medium acts directly on the adhesive through heat conduction and heat convection, causing the adhesive to be heated and converted into a gas phase, reducing the partial pressure of the solvent in the adhesive to promote solvent separation and achieve the purpose of rapid solvent separation. Through the setting of the flow guide 4, the flow direction of the heating medium is changed when it flows through the flow guide 4, resulting in a velocity gradient between the interior of the heating medium and the surface of the heating medium and the flow guide 4, thereby generating a shearing effect on the adhesive, and thus achieving the purpose of rapid dispersion and dispersal of the adhesive, which is beneficial to the subsequent flocculation and stripping processes.

[0028] It should be noted that the adhesive pretreatment device 100 is installed at the feed position of the flocculation stripping kettle, such as the feed inlet, to achieve the pretreatment of the adhesive.

[0029] In some embodiments, the heating medium can be steam, which can directly contact the adhesive and has the characteristics of high heat transfer efficiency and strong gas capacity; it can also be a thermal inert gas, such as hot nitrogen, which is safe and inert.

[0030] In this embodiment, steam is preferably used as the heating medium, which has high heat transfer efficiency and can also be used for stripping.

[0031] In some embodiments, the flow guide 4 can be arranged in various ways, such as having a boss structure with a beveled surface for mounting; or a flow guide plate arranged at an angle; or the inner cylinder 1 can be set with a corrugated or sawtooth surface.

[0032] Specifically, in this embodiment, the flow guide 4 has a guide slope, through which the heating medium can flow. Thus, when the heating medium flows through the flow guide 4, it changes its flow direction along the guide slope, thereby shearing the adhesive and allowing the adhesive to be more fully and quickly dispersed before entering the flocculation stripping reactor.

[0033] In one embodiment, the inner cylinder 1 has a first end 13 and a second end 14 disposed opposite to each other along its axial direction. The first end 13 is provided with a first flange 131, providing an installation base for subsequent structures. The adhesive pretreatment device 100 further includes a first flange 5 and a sealing element 6. The first flange 5 is sleeved on the outside of the outer cylinder 2, and the sealing element 6 is fixed between the first flange 5 and the first flange 131. Thus, the first flange 5 facilitates connection and fixation with the equipment that holds the adhesive, and the sealing element 6 seals the first flange 5 and the first flange 131, thereby ensuring the airtightness between the outer cylinder 2 and the inner cylinder 1 and reducing steam leakage.

[0034] It should be noted that the sealing element 6 can be a sealing ring, with a groove adapted to the sealing ring opened in the first flange 5, and the sealing ring is welded into the groove by welding.

[0035] In one embodiment, the second end 14 is provided with a baffle 141, which has multiple through holes for easy material discharge. This configuration closes the first discharge port 12, allowing material to be discharged through the multiple through holes, facilitating sufficient contact with steam. When the adhesive is sprayed from the small holes in the end plate, the increased surface area and sufficient contact with steam cause the solvent (such as hexane) to rapidly evaporate and enter the lower gas phase space, resulting in a rapid decrease in the solvent content of the adhesive. Simultaneously, as the solvent decreases, ethylene propylene rubber (EPDM) gradually transforms from a dissolved state into solid particles or flocs, forming a three-phase coexistence state of gas (steam + solvent), liquid (solvent-containing adhesive), and solid (EPDM particles). During this process, the steam and adhesive are fully mixed and flow at high speed at the bottom of the outer cylinder 2, forming a high-velocity three-phase mixture, effectively promoting solvent removal, flocculation, and particle formation, laying the foundation for subsequent solid-liquid separation.

[0036] To enhance the sealing effect, in one embodiment, the adhesive pretreatment device 100 further includes a sealing gasket 7, which is disposed between the outer cylinder 2 and the first flange 131. This further enhances the sealing performance between the outer cylinder 2 and the inner cylinder 1, improving the success rate of subsequent solvent removal.

[0037] Considering the installation and use of the adhesive pretreatment device 100, in one embodiment, a second flange 8 is provided on the outside of the outer cylinder 2. The adhesive pretreatment device 100 also includes a second flange 9, which is sleeved on the outside of the outer cylinder 2 and contacts the second flange 8. Thus, the movable arrangement of the second flange 9 facilitates connection with the flange at the inlet of the flocculation stripping reactor, achieving flexible use, i.e., fixing or disassembling the adhesive pretreatment device 100. Simultaneously, the second flange 8 improves the stability of the connection of the outer cylinder 2 and prevents the omission or loss of the second flange 9, thus enhancing practicality.

[0038] To facilitate the introduction of steam, in one embodiment, the adhesive pretreatment device 100 further includes a connecting cylinder 10, which is radially arranged along the outer cylinder 2 and communicates with the second feed port 21. This allows for convenient introduction of steam through the connecting cylinder 10, ensuring sufficient contact between the steam and the adhesive, thereby maximizing the role of steam in the adhesive pretreatment process. Furthermore, this radial arrangement does not significantly alter or affect the overall structure of the adhesive pretreatment device 100, achieving the addition of steam introduction functionality while maintaining device stability.

[0039] In one embodiment, a third flange 11 is provided on the side of the connecting cylinder 10 away from the outer cylinder 2. The adhesive pretreatment device 100 also includes a third flange 12, which is sleeved on the outside of the connecting cylinder 10 and contacts the third flange 11. Thus, the cooperation between the third flange 11 and the third flange 12 further enhances the stability of the connection between the connecting cylinder 10 and the external steam inlet device, preventing loosening of the connection due to pressure changes or other factors during steam introduction. This ensures that steam can stably and continuously enter the device through the connecting cylinder 10 and fully contact the adhesive.

[0040] In one embodiment, at least one of the inner cylinder 1, the outer cylinder 2, and the flow guide 4 is made of stainless steel. This is because stainless steel has a smooth surface, making it less prone to impurities adhering and facilitating cleaning and maintenance of the device. Furthermore, since the adhesive may contain corrosive components, using stainless steel effectively resists the corrosion of these components, thereby extending the service life of the inner cylinder 1, the outer cylinder 2, and the flow guide 4.

[0041] This utility model also proposes a flocculation stripping kettle, which includes a colloid pretreatment device 100. The specific structure of the colloid pretreatment device 100 is as described in the above embodiments. Since this flocculation stripping kettle adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0042] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A pretreatment device for a flocculation stripping reactor, characterized in that, include: An inner cylinder having a first inlet and a first outlet, the inner cylinder being used to contain adhesive liquid; An outer cylinder, fitted over the inner cylinder and spaced apart to form an annular channel, has a second inlet and a second outlet. The second inlet communicates with the annular channel for connecting a heating medium, and the second outlet communicates with the first outlet and the annular channel. A flow guide is arranged around the inner wall of the outer cylinder and located below the first discharge port to change the flow direction of the heating medium in the annular channel.

2. The adhesive pretreatment apparatus as described in claim 1, characterized in that, The flow guide has a guide slope, through which the heating medium can flow.

3. The adhesive pretreatment apparatus as described in claim 1, characterized in that, The inner cylinder has a first end and a second end disposed opposite to each other along its axial direction, the first end being provided with a first flange; the adhesive pretreatment device further includes: A first flange is fitted onto the outside of the outer cylinder; and, A sealing element is fixed between the first flange and the first flange.

4. The adhesive pretreatment apparatus as described in claim 3, characterized in that, The adhesive pretreatment device also includes a sealing gasket, which is disposed between the outer cylinder and the first flange.

5. The adhesive pretreatment apparatus as described in claim 3, characterized in that, The second end is provided with a baffle, and the baffle has multiple through holes.

6. The adhesive pretreatment apparatus as described in claim 1, characterized in that, The outer cylinder is provided with a second flange, and the adhesive pretreatment device also includes a second flange, which is sleeved on the outside of the outer cylinder and contacts the second flange.

7. The adhesive pretreatment apparatus as described in claim 1, characterized in that, The adhesive pretreatment device further includes a connecting cylinder, which is arranged radially along the outer cylinder and communicates with the second feed port.

8. The adhesive pretreatment apparatus as described in claim 7, characterized in that, The connecting cylinder has a third flange on the side away from the outer cylinder. The adhesive pretreatment device also includes a third flange, which is sleeved on the outside of the connecting cylinder and contacts the third flange.

9. The adhesive pretreatment apparatus as described in claim 1, characterized in that, At least one of the inner cylinder, the outer cylinder, and the flow guide is made of stainless steel.

10. A flocculation stripping kettle, characterized in that, Includes the adhesive pretreatment apparatus as described in any one of claims 1 to 9.

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