Coagulation kettle and rubber coagulation system
Through the innovative design of the four-reactor series differential pressure method and the condensation vessel, the problems of high steam consumption, equipment vibration and process complexity in the three-reactor series differential pressure method have been solved, realizing a highly efficient rubber condensation process and reducing solvent residue and environmental treatment costs.
Patent Information
- Application Number
- CN202520570029.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-03-28
AI Technical Summary
In existing technologies, the three-reactor series differential pressure method for rubber coagulation has problems such as high steam consumption, severe equipment vibration, complex process, high equipment investment and poor stirring effect, which are more pronounced under high production capacity conditions.
Design a condensation vessel and rubber condensation system. The system adopts a four-vessel series differential pressure method. The condensation vessel is equipped with a detachable sleeve and rubber cutting blade. The steam inlet structure is optimized, and the rubber cutting blade is installed on the agitator blade to reduce the need for external rubber cutting equipment. The system is combined with baffles and spray rings to improve fluid flow and heat transfer.
It effectively reduces steam consumption by 15%, reduces equipment vibration, simplifies the process, reduces equipment investment, improves stirring effect, and reduces solvent residue and environmental treatment costs.
Smart Images
Figure CN223818688U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of rubber manufacturing equipment, specifically relating to a coagulation kettle and a rubber coagulation system. Background Technology
[0002] The production of rubber polymers includes polymerization, coagulation, and post-processing steps. In the coagulation stage, a flash evaporation method is typically used to separate the solvent from the polymer. Specifically, this method is carried out under mechanical stirring. The rubber particles are dispersed in hot water as droplets. Steam is directly introduced, and some of the steam condenses, releasing latent heat, which heats the hot water and transfers the heat to the rubber particles. During this process, the solvent and monomers in the droplet-shaped rubber solution are heated and vaporized. The solvent gas and water vapor are discharged from the coagulation vessel in a certain proportion, thus achieving solvent removal. Finally, after the solvent evaporates, the rubber precipitates out as particles and disperses in the water.
[0003] Currently, the three-reactor series differential pressure method is widely used in industry to remove solvents from adhesive solutions. This method evolved from the two-reactor series differential pressure method. However, some problems still exist. Steam consumption is still relatively high, and unreasonable design of the coagulation vessel leads to serious equipment vibration problems caused by direct contact between water and steam during operation. Conventional coagulation processes require external rubber cutting equipment to handle the large rubber lumps generated during coagulation, increasing process complexity and equipment investment. At the same time, with the development of technology, the single-line capacity of rubber plants is now mostly 60,000 tons / year or more. If a three-reactor coagulation method is used, the volume of the vessels will increase, and the diameter of the agitator will also increase accordingly, resulting in a decrease in the agitator speed and affecting the coagulation effect. Utility Model Content
[0004] To address the problems in the existing technology, this utility model proposes a coagulation kettle and a rubber coagulation system.
[0005] According to a first aspect of the present invention, the present invention provides a condensation vessel, including a vessel body and a stirring device. The bottom of the vessel body is provided with a steam inlet, the side wall of the vessel body is provided with a liquid phase inlet and a liquid phase outlet, and the top of the vessel body is provided with a gas phase outlet. The steam inlet is provided with a detachable sleeve, and the end of the sleeve facing the vessel body is provided with an orifice plate. The stirring device includes a stirring paddle disposed in the vessel body, and the blades of the stirring paddle are provided with a cutting blade for cutting the rubber block.
[0006] According to a second aspect of the present invention, a rubber coagulation system is provided, comprising four coagulation vessels connected in series; wherein at least the first, second, and third coagulation vessels are described in the description of the coagulation vessels.
[0007] The liquid phase outlet of the first condensation vessel is connected to the liquid phase inlet of the second condensation vessel, and its gas phase outlet is connected to the solvent recovery unit; the liquid phase outlet of the second condensation vessel is connected to the liquid phase inlet of the third condensation vessel, and its gas phase outlet is connected to the steam inlet of the first condensation vessel; the liquid phase outlet of the third condensation vessel is connected to the liquid phase inlet of the fourth condensation vessel, and its gas phase outlet is connected to the steam inlet of the second condensation vessel; the gas phase outlet of the fourth condensation vessel is connected to the steam inlet of the second condensation vessel.
[0008] Compared with the prior art, the coagulation vessel of this utility model is equipped with a glue-cutting device inside the coagulation vessel, avoiding additional equipment investment and process complexity. Specifically, blades are added to the agitator blades, which can cut large glue blocks while stirring, eliminating the need for an additional external glue-cutting system.
[0009] The steam inlet design of this utility model allows for good steam dispersion, solves the vibration caused by water hammer, and prevents colloid particles from entering the steam pipe. The structure is also detachable, making it easy to clean and replace. At the same time, the original pipeline regulating valve is eliminated, reducing the occurrence of pipeline blockage, optimizing operating conditions, and enabling stable coagulation operation. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the condensation vessel structure according to an embodiment of the present utility model;
[0011] Figure 2 This is a schematic diagram of the steam inlet structure according to an embodiment of the present utility model;
[0012] Figure 3 This is a schematic diagram of the orifice plate structure for the steam inlet.
[0013] Figure 4 This is a schematic diagram showing the installation position and angle of the baffle plate of this utility model;
[0014] Figure 5 This is a schematic diagram of the spray ring installation of this utility model;
[0015] Figure 6 This is a schematic diagram of the rubber coagulation system of this utility model.
[0016] In the figure, steam inlet 11, liquid phase inlet 12, liquid phase outlet 13, gas phase outlet 14, spray water inlet 15, spray ring 16, nozzle 17, baffle plate 18, spray ring bracket 19, and rubber cutting blade 21. Detailed Implementation
[0017] The present invention will be further described and illustrated below with reference to specific embodiments. The embodiments described are merely examples of the present disclosure and do not limit the scope of the invention. The technical features of each embodiment of the present invention can be combined accordingly, provided that there is no conflict between them.
[0018] like Figure 1 As shown, the bottom of the condensation vessel of this utility model is provided with a steam inlet 11, the side wall of the vessel is provided with a liquid phase inlet 12 and a liquid phase outlet 13, and the top of the vessel is provided with a gas phase outlet 14. The liquid phase inlet is mainly used for feeding the polymer solution, and the liquid phase outlet discharges the treated polymer solution.
[0019] like Figure 2 As shown, considering the vibration caused by water hammer in the vessel body, and to prevent colloidal particles from entering the steam pipe and promote steam dispersion, a detachable sleeve is provided inside the steam inlet of this embodiment. The end of the sleeve facing the vessel body has an orifice plate. Figure 3 As shown, the orifice plate is uniformly perforated. The orifice size is selected according to the size of the colloid in the process. Generally, the orifice diameter can be set to 6mm and the spacing between adjacent orifices to 10mm, which allows for good steam dispersion, solves the vibration caused by water hammer, and prevents colloid particles from entering the steam pipe. Since the sleeve is a detachable structure, it is very convenient to clean and replace. In this embodiment, the installation angle of the orifice plate is consistent with the inclination angle of the vessel wall in its area.
[0020] like Figure 1 As shown, in a preferred embodiment, the stirring device includes a motor outside the vessel body and a stirring paddle coaxially connected to the motor. To chop large pieces of adhesive, this embodiment provides cutting blades 21 on the blades of the stirring paddle for cutting the adhesive. The shape of the blades can be selected as needed; they can have blades on both sides or on one side. With faster cutting speed, an additional external adhesive-cutting system for the coagulation vessel is no longer needed, avoiding additional equipment investment and process complexity. In this embodiment, each blade of the stirring paddle is equipped with two cutting blades 21, one horizontally arranged and the other at a 45° angle. The 45° angle of the cutting blade can be upward or downward, selected according to the blade type and the expected distribution location of large pieces of adhesive in the process. The cutting blades can be bolted to the blades, and the blades can be those commonly used in coagulation vessels in the art.
[0021] like Figure 4 As shown, to prevent the colloid from sticking to the wall, this embodiment provides a pair of baffles 18 on the inner wall of the vessel. In this embodiment, the baffles 18 are arranged on the inner wall of the vessel at the installation height of the stirring blade. The height of the baffles 18 can be adjusted appropriately according to process requirements, and the middle position of the baffles 18 is flush with the installation height of the stirring blade. A set distance is maintained between the baffles 18 and the colloid cutting blade 21 to avoid contact. Figure 4As shown, the main body shape of the baffle is a triangular prism (approximately triangular in horizontal cross-section) bulging towards the center of the vessel. The surface of the triangular prism includes a first plane facing the incoming flow and a second plane facing away from the incoming flow. The line connecting the vertices of the two baffles 18 passes through the central axis of the vessel. The acute angle between the line connecting the vertices and the first plane is 45°, and the acute angle between the line connecting the vertices and the second plane is 60°. Figure 1 As shown, the top and bottom of the triangular prism are designed with slopes to achieve a transition with the vessel wall, and the angle between the slope and the vessel wall is 60°. The baffle 18 guides the flow of fluid and disrupts the laminar flow pattern of the fluid near the inner wall of the vessel.
[0022] In one specific embodiment, a spray ring 16 is further provided on the top of the vessel, and nozzles 17 are evenly arranged on the spray ring. The spray ring is connected to an external hot water pipeline through a spray water inlet 15 for spraying hot water into the vessel. Figure 5 As shown, in a specific embodiment of this utility model, the installation angle between adjacent nozzles is 45°, and the nozzles spray towards the inner wall of the vessel. The spray range between adjacent nozzles has a certain degree of coverage to ensure that the entire inner wall surface can be completely sprayed. The spray ring 16 is fixedly connected to the inner wall of the vessel through the spray ring bracket 19.
[0023] like Figure 6 As shown, the rubber coagulation system of this utility model includes four coagulation vessels connected in series; wherein, at least the first coagulation vessel, the second coagulation vessel, and the third coagulation vessel adopt... Figure 1 The aforementioned coagulation vessel, specifically the fourth coagulation vessel, typically does not require bottom steam feeding; only a certain amount of steam needs to be added during the start-up phase. Therefore, the vibration caused by water hammer is not significant, and there is generally no need to consider the entry of colloidal particles into the steam pipeline. Thus, a conventional coagulation vessel in the art can be selected.
[0024] As shown in the figure, the liquid phase outlet of the first condensation vessel is connected to the liquid phase inlet of the second condensation vessel, and its gas phase outlet is connected to the solvent recovery unit; the liquid phase outlet of the second condensation vessel is connected to the liquid phase inlet of the third condensation vessel, and its gas phase outlet is connected to the steam inlet of the first condensation vessel; the liquid phase outlet of the third condensation vessel is connected to the liquid phase inlet of the fourth condensation vessel, and its gas phase outlet is connected to the steam inlet of the second condensation vessel; the gas phase outlet of the fourth condensation vessel is connected to the steam inlet of the second condensation vessel. The gas phase outlet of the first condensation vessel is connected to the solvent recovery unit after heat exchange via a heat exchanger, and the solvent recovery unit is a gas-liquid separator.
[0025] The system may also include a drying device as a post-processing unit, which is connected to the liquid phase outlet of the fourth condensation vessel for drying the product.
[0026] The liquid phase outlet of the upper-level condenser is connected to the liquid phase inlet of the lower-level condenser via a transfer pump, and no pipeline regulating valve is installed on the liquid phase transfer pipeline.
[0027] The operation process of the rubber coagulation system can be as follows: Rubber solution and water are mixed, a certain proportion of dispersant is added, and the mixture enters the first coagulation vessel. The operating pressure is 1-15 kPa, and the steam flow rate is adjusted to control the operating temperature at 80-100℃. The vapor phase is condensed and recovered before entering the solvent recovery unit. The liquid level in the first coagulation vessel is adjusted by controlling the pump frequency, and the liquid phase is simultaneously sent to the second coagulation vessel. The operating temperature of the second vessel is 110-125℃, and the pressure is 60-80 kPa. The vapor phase returns to the first coagulation vessel, and the liquid phase enters the third coagulation vessel. The operating temperature of the third vessel is 125-140℃, and the pressure is 100-120 kPa. The vapor phase returns to the second coagulation vessel, and the liquid phase enters the fourth coagulation vessel. The operating temperature of the fourth vessel is 90-100℃, and the pressure is 85-95 kPa. The vapor phase is pumped back to the second coagulation vessel using a Venturi steam jet pump, and the water containing rubber particles enters the post-treatment unit. The rubber coagulation system of this invention corresponds to a gelation process that can be called the four-reactor series differential pressure method. Simulation data shows that, under the same processing task, it can reduce steam consumption by about 15% compared to the three-reactor coagulation method. The solvent residue in the rubber in the three-reactor process can reach 0.1%, while the four-reactor process can be less than 0.07%. The equipment investment increases by about 20% compared to the three-reactor method. Taking a 60,000-ton-per-year styrene-butadiene rubber production line as an example, it can save about 10,000 tons of steam annually, increase solvent recovery by about 70 tons annually, and reduce VOC emissions from the post-treatment unit, resulting in significant overall benefits. Therefore, compared to the three-reactor series differential pressure method, the rubber coagulation system of this invention can save steam consumption without significantly increasing equipment costs. Furthermore, the volume of each reactor does not increase substantially, while maintaining a high agitator speed, which is beneficial for improving coagulation efficiency and reducing environmental treatment costs.
[0028] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. For those skilled in the art, various modifications and improvements can be made without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.
Claims
1. A coagulation vessel, comprising a vessel body and a stirring device, characterized in that, The bottom of the vessel is provided with a steam inlet, the side wall of the vessel is provided with a liquid phase inlet and a liquid phase outlet, and the top of the vessel is provided with a gas phase outlet. The steam inlet is provided with a detachable sleeve, and the end of the sleeve facing the vessel is provided with an orifice plate. The stirring device includes a stirring paddle provided in the vessel, and the blades of the stirring paddle are provided with a cutting blade for cutting the rubber block.
2. The condensation vessel according to claim 1, characterized in that, A pair of baffles are provided on the inner wall of the vessel. The baffles are kept at a set distance from the cutting blade. The main body of the baffle is a triangular prism protruding towards the center of the vessel. The surface of the triangular prism includes a first plane facing the incoming flow and a second plane facing away from the incoming flow. The line connecting the vertices of the two baffles passes through the central axis of the vessel. The acute angle between the line connecting the vertices and the first plane is 45°, and the acute angle between the line connecting the vertices and the second plane is 60°.
3. The condensation vessel according to claim 1, characterized in that, Each blade of the agitator is equipped with two cutting blades, one of which is arranged horizontally and the other is arranged at a 45° angle.
4. The condensation vessel according to claim 1, characterized in that, The top of the vessel is equipped with a spray ring, on which nozzles are evenly arranged. The spray ring is connected to an external hot water pipeline for spraying hot water into the vessel. The nozzles spray towards the inner wall of the vessel, and the spray range between adjacent nozzles has a certain degree of coverage to ensure that the entire inner wall of the vessel can be completely sprayed.
5. The condensation vessel according to claim 1, characterized in that, The perforated plate is uniformly provided with holes, each hole having a diameter of 6 mm and a spacing of 10 mm between adjacent holes.
6. A rubber coagulation system, characterized in that, It includes four condensation vessels connected in series: a first condensation vessel, a second condensation vessel, a third condensation vessel, and a fourth condensation vessel; wherein at least the first condensation vessel, the second condensation vessel, and the third condensation vessel are condensation vessels as described in any one of claims 1-5; The liquid phase outlet of the first condensation vessel is connected to the liquid phase inlet of the second condensation vessel, and its gas phase outlet is connected to the solvent recovery unit. The liquid phase outlet of the second condenser is connected to the liquid phase inlet of the third condenser, and its gas phase outlet is connected to the steam inlet of the first condenser. The liquid phase outlet of the third condenser is connected to the liquid phase inlet of the fourth condenser, and its gas phase outlet is connected to the steam inlet of the second condenser. The gas phase outlet of the fourth condenser is connected to the steam inlet of the second condenser.
7. The rubber coagulation system according to claim 6, characterized in that, The gas phase outlet of the first condensation vessel is connected to the solvent recovery unit after heat exchange via a heat exchanger. The solvent recovery unit is a gas-liquid separator.
8. The rubber coagulation system according to claim 6, characterized in that, The system also includes a post-processing unit, which is connected to the liquid phase outlet of the fourth condensation vessel and is a drying device.
9. The rubber coagulation system according to claim 6, characterized in that, The liquid phase outlet of the upstream condenser is connected to the liquid phase inlet of the downstream condenser via a transfer pump, and no pipeline regulating valve is installed on the liquid phase transfer pipeline.