A distillation system for degassing carboxylated styrene-butadiene latex

Abstract

This invention provides a distillation system for degassing carboxylated styrene-butadiene latex, comprising a polymerization kettle, a distillation column, a condenser, a buffer tank, a mixed-phase feed pump, a conditioning tank, and a vibrating screen. The outlet of the polymerization kettle is connected to the inlet on the side wall of the distillation column. The vapor phase outlet of the distillation column is sequentially connected to the inlet of the polymerization kettle via the condenser, the buffer tank, and the mixed-phase feed pump. The liquid phase outlet of the distillation column is connected to the inlet of the conditioning tank, and the outlet of the conditioning tank is connected to the inlet of the vibrating screen. A fractionation device is provided in the distillation column, comprising several trays. Each tray has multiple valve tubes evenly distributed through it, and each valve tube contains a Tesla valve. A sliding float valve structure is provided at the top of each valve tube. This high-efficiency distillation system can effectively disperse the vapor phase during distillation, allowing for more thorough countercurrent contact between the vapor and liquid phases and more complete interphase mass transfer, thereby further improving the distillation effect and efficiency while reducing energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of distillation apparatus technology, specifically to a distillation system for degassing carboxylated styrene-butadiene latex. Background Technology

[0002] Distillation is a commonly used industrial method for separation and purification. It achieves separation by utilizing the difference in boiling points between components—that is, the different vapor pressures of each component at the same temperature. This causes lower-boiling-point components (lighter components) in the liquid phase to transfer to the gas phase, while higher-boiling-point components (heavier components) in the gas phase transfer to the liquid phase. The gaseous phase rises along the column, while the liquid phase descends. This upward and downward flow creates countercurrent mass and heat transfer, thus effectively purifying the desired product. However, if the contact between the liquid and gaseous phases is insufficient during distillation, the mass and heat transfer will be inefficient, resulting in a lower separation rate and consequently, lower purity of the purified product.

[0003] To address this, the inventors designed a high-efficiency distillation system based on a Tesla valve (patent CN222723637U). By installing a Tesla valve in the flow channel within the distillation column, the rising rate of the vapor phase and heat is accelerated, resulting in more heat being retained between the upper side of the tray and the lower side of the adjacent tray, thereby accelerating the distillation rate of the liquid. Simultaneously, this invention also utilizes the deflection structure within the Tesla valve cavity to allow the downstream liquid phase to more fully contact the rising vapor phase in a countercurrent flow, resulting in more complete interphase mass transfer and improving the distillation effect of the liquid.

[0004] However, the inventors discovered during production practice that the mass and heat transfer efficiency of the distillation system was still not high enough to meet the higher quality production requirements of products such as carboxylated styrene-butadiene latex, and there was also the problem of high system energy consumption. Utility Model Content

[0005] To better address the aforementioned issues, this invention provides a distillation system for degassing carboxylated styrene-butadiene latex, which solves the problem of low mass and heat transfer efficiency in existing distillation systems affecting product quality, production efficiency, and energy consumption.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A distillation system for degassing carboxylated styrene-butadiene latex includes a polymerization kettle, a distillation column, a condenser, a buffer tank, a mixed-phase feed pump, an adjusting vessel, and a vibrating screen. The outlet of the polymerization kettle is connected to the inlet of the distillation column's side wall. The vapor phase outlet of the distillation column is connected to the inlet of the condenser. The outlet of the condenser is connected to the inlet of the buffer tank. The inlet of the buffer tank is connected to the inlet of the polymerization kettle via the mixed-phase feed pump. The liquid phase outlet of the distillation column is connected to the inlet of the adjusting vessel. The outlet of the adjusting vessel is connected to the inlet of the vibrating screen. The distillation column is equipped with a fractionation device, which includes several trays. Each tray is uniformly equipped with multiple valve tubes, each valve tube containing a Tesla valve, and the top of the valve tube is equipped with a sliding float valve structure.

[0008] Optionally, the top end of the valve tube protrudes from the upper surface of the tray, and the bottom end extends from the lower surface of the tray and downwards.

[0009] Optionally, the float valve structure includes a valve plate and a plurality of sliding guide rods connected to the lower side of the valve plate. The bottom of the sliding guide rods has a slider facing outward. A slide rail is provided on the inner wall of the valve tube corresponding to the slider, and the slider cooperates with the slide rail.

[0010] Optionally, a through hole is provided at the center of the valve plate.

[0011] Optionally, limiting elements are provided at the top and bottom of the slide.

[0012] Optionally, the Tesla valve includes a main flow channel and multiple check flow channels. The multiple check flow channels are distributed at intervals along the extension direction of the main flow channel, and the upper and lower ends of each check flow channel are connected to different positions of the main flow channel along the extension direction of the main flow channel.

[0013] Optionally, there is a gap between the Tesla valve and the corresponding valve tube inner wall.

[0014] Optionally, the valves of adjacent upper and lower trays are staggered.

[0015] Optionally, a feed pump is installed on the pipeline connecting the outlet of the polymerization reactor and the inlet of the distillation column sidewall.

[0016] The distillation system for degassing carboxylated styrene-butadiene latex according to the present invention has at least the following effective effects:

[0017] This high-efficiency distillation system accelerates the distillation rate of latex emulsions by installing valves on the multi-layer trays of the distillation column and using Tesla valves to accelerate the rise of the vapor phase and heat. The deflection structure of the Tesla valves allows the downstream liquid phase to come into more countercurrent contact with the rising vapor phase, resulting in more efficient interphase mass transfer and improved distillation efficiency.

[0018] This high-efficiency distillation system also incorporates a floating valve structure on the valve tube. This floating valve can adjust its opening degree as the gas flow changes during distillation, allowing gas to flow out and effectively disperse the gas phase. This ensures more thorough contact between the gas and liquid phases, further improving interphase mass and heat transfer efficiency. Consequently, it enhances the distillation efficiency of the distillation column, improves the quality of the final carboxylated styrene-butadiene latex product, and increases the overall system's production efficiency. Furthermore, it reduces energy consumption and provides safety protection.

[0019] This high-efficiency distillation system has the advantages of simple structure, reliable performance, and convenient use. It is highly practical and suitable for the production of carboxylated styrene-butadiene latex. It can increase the distillation rate of liquid while ensuring the distillation effect, thereby ensuring product quality, improving production efficiency, and reducing system energy consumption. Attached Figure Description

[0020] 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.

[0021] Figure 1 This is a schematic diagram of the structure of the high-efficiency distillation system according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the distillation column of the high-efficiency distillation system according to an embodiment of the present invention;

[0023] Figure 3 This is a top view of the tray of the high-efficiency distillation system according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the top of the valve tube of the high-efficiency distillation system according to an embodiment of the present invention.

[0025] Figure label:

[0026] 1. Polymerization kettle; 2. Distillation column; 3. Condenser; 4. Buffer tank; 5. Mixed phase feed pump; 6. Adjustment kettle; 7. Vibrating screen; 8. Tray; 9. Valve pipe; 10. Floating valve structure; 11. Tesla valve; 12. Valve plate; 13. Sliding guide rod; 14. Slider; 15. Slide rail; 16. Limiting component. Detailed Implementation

[0027] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the implementations of the base model disclosed below.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] like Figure 1-4 As shown, a distillation system for degassing carboxylated styrene-butadiene latex according to an embodiment of this utility model includes a polymerization kettle 1, a distillation column 2, a condenser 3, a buffer tank 4, a mixed-phase feed pump 5, a conditioning kettle 6, and a vibrating screen 7; wherein,

[0030] The polymerization reactor 1 is used to polymerize the raw materials for preparing carboxylated styrene-butadiene latex that are pumped in, generating a latex emulsion. The bottom outlet of the polymerization reactor 1 is connected to the inlet of the side wall of the distillation column 2 through a feed pipeline. A feed pump is installed on the feed pipeline to control the flow rate of the latex emulsion pumped into the distillation column 2.

[0031] Distillation column 2 is used for high-quality and efficient degassing and distillation of the pumped latex emulsion to obtain high-purity carboxylated styrene-butadiene latex. The feed inlet of distillation column 2 is connected to the discharge outlet of polymerization reactor 1. The liquid phase outlet at the bottom of distillation column 2 is connected to the feed inlet of adjustment vessel 6 through a feed pipeline to transport the carboxylated styrene-butadiene latex emulsion to adjustment vessel 6. The gas phase outlet at the top of distillation column 2 is connected to the inlet of condenser 3 through a feed pipeline to allow the gas phase material to enter condenser 3. Distillation column 2 can be configured as a vacuum chamber wall to prevent heat leakage and enhance the insulation effect.

[0032] The condenser 3 is used to condense the incoming gaseous material to form a mixture of gas and liquid phases; the outlet end of the condenser 3 is connected to the inlet of the buffer tank 4 through a conveying pipeline, so that the two-phase mixture enters the buffer tank 4.

[0033] The buffer tank 4 is used to temporarily store the two-phase mixture. The outlet of the buffer tank 4 is connected to the inlet of the mixed phase feed pump 5, and the outlet of the mixed phase feed pump 5 is connected to the inlet of the polymerization reactor 1. The mixed phase feed pump 5 is used to pump the two-phase mixture temporarily stored in the buffer tank 4 back into the polymerization reactor 1 for reuse in the polymerization reaction.

[0034] The adjusting vessel 6 is used to adjust (including concentration) the incoming latex emulsion to produce a high-purity, high-solids carboxylated styrene-butadiene latex emulsion. The outlet of the adjusting vessel 6 is connected to the inlet of the vibrating screen 7 through a conveying pipeline. The vibrating screen 7 is used to filter the emulsion to finally obtain a qualified carboxylated styrene-butadiene latex product.

[0035] In this distillation system, the distillation column 2 is equipped with a fractionation device, which includes several trays 8, dividing the column cavity into multiple chambers. Multiple cylindrical valve tubes 9 are evenly inserted through each tray 8. The top of the valve tube 9 is slightly higher than or flush with the upper surface of the tray 8, allowing its top to protrude from the upper surface of the tray 8. The lower end of the valve tube 9 extends downward from the lower surface of the tray 8. The multiple chambers in the distillation column 2 are connected by the multiple valve tubes 9 on each tray 8, and the valve tubes 9 of adjacent upper and lower trays 8 are staggered. Each valve tube 9 is equipped with a Tesla valve 11, and a floating valve structure 10 is provided at the top of the valve tube 9. The floating valve structure 10 is slidably disposed inside the top of the valve tube 9, and can slide out from the top of the valve tube 9 or slide into the tube from the top of the valve tube 9.

[0036] In one optional embodiment, the float valve structure 10 includes a valve plate 12 and a plurality of sliding guide rods 13 connected to the lower side of the valve plate 12. The plurality of sliding guide rods 13 are evenly distributed around the periphery of the valve plate 12, and the bottom of each sliding guide rod 13 has a slider 14 extending radially outward along the valve plate 12. A plurality of slides 15 are provided on the inner wall of the top of the valve tube 9, and the plurality of sliders correspond one-to-one with the plurality of sliding guide rods 13. Each slider 14 cooperates with a slide 15, and the slider 14 slides in the slide 15. During the distillation process, the tray 8 can slide in the valve tube 9 under the push of gas and the guidance of the sliding guide rods 13. That is, the gas flow rate can determine the opening degree of the valve plate 12.

[0037] Furthermore, limiting elements 16 are provided at both the top and bottom of the slide 15 to prevent the slider 14 from dislodging from the valve tube 9 and to limit the position of the valve plate 12 sliding into the valve tube 9. The limiting element 16 can be a limiting block installed on the side wall of the valve tube 9 or an annular limiting plate installed on the top of the valve tube 9. Optionally, a through hole (not shown in the figure) is provided at the center of the valve plate 12. This through hole facilitates the upward movement of gas and the downward movement of liquid when the valve plate 12 is not pushed up, and also allows some gas to pass through when the gas flow is strong and pushes up the valve plate 12, so that the gas can both rise quickly and disperse to the periphery.

[0038] Optionally, the Tesla valve 11 in the valve tube 9 includes a main flow channel and multiple check channels. The multiple check channels are spaced apart on the left and right sides along the extension direction (axial direction of the main flow channel), and the upper and lower ends of each check channel are connected to different positions of the main flow channel along the extension direction of the main flow channel. Furthermore, there is a gap between the Tesla valve 11 and the corresponding inner wall of the valve tube 9, allowing the liquid to flow downward through this gap during the upward movement of the gas.

[0039] In this embodiment of the distillation column 2, the carboxylated styrene-butadiene latex emulsion enters from the side wall in the middle of the column body. Inside the column, it flows gradually from the upper tray 8 to the lower tray 8 under its own gravity, forming a flowing liquid layer on the upper surface of each tray 8. The liquid phase flows into the valve tube 9 from where the valve plate 12 is lifted by gas, and falls through the gap between the valve tube 9 and the Tesla valve 11. The gas, propelled by the pressure difference, flows upward from the bottom of the column, passing through the liquid layers on each tray 8 sequentially towards the top. This distillation column 2 utilizes the Tesla valve 11 to accelerate the gas, causing it to flow upwards on the tray 8. By accelerating the upward movement of the gas phase and heat through the Tesla valve, more heat can be retained in the upper cavity of the tray, thereby accelerating the distillation rate of the liquid. During the upward movement of the gas phase, the liquid phase in the material falls through the gap between the valve tube and the Tesla valve, exchanging heat with the gas inside the Tesla valve. The deflection structure within the Tesla valve cavity allows the downstream liquid phase to come into more full countercurrent contact with the rising vapor phase, resulting in more efficient interphase mass transfer and improved liquid distillation efficiency.

[0040] Furthermore, the float valve at the top of the valve tube can float on the tray, changing its opening degree with the change of gas flow rate. Gas flows out from the float valve, changing the upward flow direction of the gas to a lateral flow direction, thereby effectively dispersing the gas phase, making the contact between the gas phase and the liquid phase more sufficient, further improving the mass and heat transfer efficiency between phases, thereby further improving the distillation efficiency of the distillation column, improving the quality of the final product of carboxylated styrene-butadiene latex, and improving the production efficiency of the entire system; it can also reduce energy consumption and play a safety protection role.

[0041] In practical applications, the polymerization kettle 1, condenser 3, buffer tank 4, mixed-phase feed pump 5, adjusting kettle 6, vibrating screen 7, Tesla valve 11, and other equipment in the high-efficiency distillation system of this embodiment can all be existing equipment with corresponding functions and meeting process requirements, which will not be elaborated further here. Furthermore, other equipment or components can be added to this high-efficiency distillation system, or the actual installation positions of each equipment or component can be adjusted to achieve the practical application or other functions of the high-efficiency distillation system.

[0042] According to an exemplary embodiment of the present invention, when the high-efficiency distillation system is used to produce carboxylated styrene-butadiene latex, it may include the following steps:

[0043] Polymerization: The raw materials for preparing carboxylated styrene-butadiene latex are added to polymerization reactor 1 for polymerization reaction. After reacting for a certain time under certain conditions, a primary liquid phase latex emulsion is obtained. The feed pump is turned on and the latex emulsion is pumped into distillation column 2.

[0044] Degassing and Distillation: High-temperature steam is introduced into the bottom of distillation column 2 and rises sequentially through valves 9 on each tray 8; the primary latex emulsion enters distillation column 2 and flows downwards sequentially through valves 9 on each tray 8. In this step, the gas phase is accelerated using a Tesla valve 11 and dispersed using a float valve, allowing for more thorough countercurrent contact between the rising gas phase and the flowing liquid phase, further improving interphase mass and heat transfer efficiency, thereby effectively improving the distillation effect and efficiency of the latex emulsion. In this distillation step, the liquid phase component eventually flows to the bottom of the column and is discharged from the bottom outlet to the adjusting vessel 6; the gas phase component rises to the top of the column and is transported to the condenser 3 from the gas phase outlet at the top of the column.

[0045] Condensation: The condenser 3 condenses the incoming gas phase components and then introduces them into the buffer tank 4. The mixed phase feed pump 5 pumps the gas-liquid two-phase mixture temporarily stored in the buffer tank 4 into the polymerization kettle 1 for reuse in polymerization.

[0046] Adjustment and filtration: After the liquid phase components flowing out of the distillation column 2 are concentrated and adjusted by the adjustment vessel 6, they are filtered by the vibrating screen 7 to obtain a high-purity, high-solids, high-quality carboxylated styrene-butadiene latex product, which is then transported to the finished product tank for storage.

[0047] It should be noted that, depending on the implementation needs, the various components described in the embodiments of this utility model can be split into more components, or two or more components or parts of components can be combined into new components to achieve the purpose of the embodiments of this utility model.

[0048] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A rectification system for degassing of carboxylated styrene butadiene latex, characterized in that, Includes polymerization reactor, distillation column, condenser, buffer tank, mixed phase feed pump, conditioning tank, and vibrating screen; The outlet of the polymerization reactor is connected to the inlet of the distillation column sidewall; the gas phase outlet of the distillation column is connected to the inlet of the condenser; the outlet of the condenser is connected to the inlet of the buffer tank; and the inlet of the buffer tank is connected to the inlet of the polymerization reactor via a mixed-phase feed pump. The liquid phase outlet of the distillation column is connected to the inlet of the adjusting vessel; and the outlet of the adjusting vessel is connected to the inlet of the vibrating screen. The distillation column is equipped with a fractionation device, which includes several layers of trays. Each tray is evenly equipped with multiple valve tubes, each valve tube is equipped with a Tesla valve, and the top of the valve tube is equipped with a sliding float valve structure.

2. The distillation system for degassing carboxylated styrene-butadiene latex according to claim 1, characterized in that, The top of the valve tube protrudes from the upper surface of the tray, and the bottom of the valve tube extends downward from the lower surface of the tray.

3. A rectification system for degassing of carboxylated styrene butadiene latex according to claim 1, characterized in that, The floating valve structure includes a valve plate and multiple sliding guide rods connected to the lower side of the valve plate. The bottom of the sliding guide rods has a slider facing outward. A slide rail is provided on the inner wall of the valve tube corresponding to the slider, and the slider cooperates with the slide rail.

4. A rectification system for degassing of carboxylated styrene butadiene latex according to claim 3, characterized in that, A through hole is provided at the center of the valve plate.

5. A rectification system for degassing of carboxylated styrene butadiene latex according to claim 3, characterized in that, Limiting elements are provided at the top and bottom of the slide.

6. A rectification system for degassing of carboxylated styrene butadiene latex according to claim 1, characterized in that, The Tesla valve includes a main flow channel and multiple check flow channels. The multiple check flow channels are distributed at intervals along the extension direction of the main flow channel, and the upper and lower ends of each check flow channel are connected to different positions of the main flow channel along the extension direction of the main flow channel.

7. A distillation system for degassing carboxylated styrene-butadiene latex according to claim 1, characterized in that, There is a gap between the Tesla valve and the inner wall of the corresponding valve tube.

8. A rectification system for degassing of carboxylated styrene butadiene latex according to claim 1, characterized in that, The valves on adjacent upper and lower trays are staggered.

9. A rectification system for degassing of carboxylated styrene butadiene latex according to claim 1, characterized in that, A feed pump is installed on the pipeline connecting the outlet of the polymerization reactor to the inlet of the distillation column sidewall.

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