Continuous reactor for long-chain branched modified rare earth butadiene rubber

Abstract

The utility model discloses a continuous reactor for long-chain branched modified rare earth butadiene rubber, which comprises a first reaction kettle, a second reaction kettle, a third reaction kettle and a fourth reaction kettle, a first feed port is arranged at the bottom of the first reaction kettle, and a first overflow port is arranged at the top of the first reaction kettle; the bottom of the second reaction kettle is provided with a second feed port, the second feed port is communicated with the first overflow port, and the top of the second reaction kettle is provided with a second overflow port; a third feeding port is formed in the bottom of the third reaction kettle and communicated with the second overflow port, a third overflow port is formed in the position, larger than or equal to 50% of the liquid level, of the third reaction kettle, and a polytetrafluoroethylene anti-corrosion film is arranged in the third reaction kettle in a lining mode. And the gas phase vent nozzle of the kettle cover of the third reaction kettle and the gas phase distributor at the kettle bottom of the third reaction kettle are connected with an external gas phase external circulation system. The continuous reactor disclosed by the utility model can improve the production efficiency of the long-chain branched modified rare earth butadiene rubber.

Description

Technical Field

[0001] The utility model relates to the technical field of reactors, in particular to a continuous reactor for long-chain branched modified rare-earth cis-1,4-polybutadiene rubber. Background Art

[0002] As an important synthetic rubber, rare-earth cis-1,4-polybutadiene rubber has broad application prospects in the fields of tire manufacturing, automotive parts, etc. due to its high molecular weight, regular structure, excellent flex fatigue resistance, wear resistance and low rolling resistance. However, the molecular chains of rare-earth cis-1,4-polybutadiene rubber are highly linear, resulting in high viscosity of its rubber solution, low mass transfer and heat transfer efficiency, difficult transportation and spraying, obvious pre-vulcanization during the rubber mixing process, excessive increase in the Mooney viscosity of the mixed rubber, and poor cold flow resistance, which is not conducive to the storage and transportation of rubber products.

[0003] To solve the above problems, researchers have developed a variety of long-chain branching modification technologies to reduce the linear degree of the molecular chains of rare-earth cis-1,4-polybutadiene rubber by introducing branched structures, thereby reducing the viscosity of the rubber solution and improving the processing performance and cold flow resistance. However, the existing long-chain branching modification technologies have many deficiencies, such as special structures of branching modifiers, high prices, limited raw material sources, high toxicity, unpleasant odors, excessive addition amounts, and difficult control of branching reaction activity. These problems limit the industrial production and application of rare-earth cis-1,4-polybutadiene rubber. Summary of the Utility Model

[0004] In order to solve at least one of the above problems, the utility model provides a continuous reactor for long-chain branched modified rare-earth cis-1,4-polybutadiene rubber, which can improve the production efficiency of long-chain branched modified rare-earth cis-1,4-polybutadiene rubber.

[0005] The purpose of the utility model is achieved by the following technical solutions:

[0006] The utility model provides a continuous reactor for long-chain branched modified rare-earth cis-1,4-polybutadiene rubber, comprising:

[0007] A first reaction kettle, the bottom of the first reaction kettle is provided with a first feed inlet, and the top of the first reaction kettle is provided with a first overflow outlet;

[0008] A second reaction kettle, the bottom of the second reaction kettle is provided with a second feed inlet, the second feed inlet is communicated with the first overflow outlet, and the top of the second reaction kettle is provided with a second overflow outlet; and

[0009] A third reaction kettle, the bottom of the third reaction kettle is provided with a third feed inlet, the third feed inlet is communicated with the second overflow outlet, a third overflow outlet is provided at a liquid level greater than or equal to 50% of the third reaction kettle, the inner lining of the third reaction kettle is provided with a polytetrafluoroethylene anti-corrosion film, and the gas-phase vent of the kettle cover of the third reaction kettle and the gas-phase distributor at the bottom of the third reaction kettle are both connected to an external gas-phase external circulation system.

[0010] Further, the continuous reactor for the long-chain branched modified rare earth cis-1,4-polybutadiene rubber further includes:

[0011] A raw material storage tank for storing raw materials;

[0012] A liquid metering pump, the input end of the liquid metering pump is connected to the output end of the raw material storage tank; and

[0013] A metering tank, the input end of the metering tank is connected to the output end of the liquid metering pump, and the output end of the metering tank is connected to the first feed port.

[0014] Further, the raw material storage tank includes:

[0015] A monomer storage tank, the output end of the monomer storage tank is connected to the input end of the liquid metering pump;

[0016] A solvent storage tank, the output end of the solvent storage tank is connected to the input end of the liquid metering pump; and

[0017] A catalyst storage tank, the output end of the catalyst storage tank is connected to the input end of the liquid metering pump.

[0018] Further, the liquid metering pump includes:

[0019] A monomer metering pump, the input end of the monomer metering pump is connected to the output end of the monomer storage tank, and the flow rate range of the monomer metering pump is 0-100 ml / min;

[0020] A solvent metering pump, the input end of the solvent metering pump is connected to the output end of the solvent storage tank, and the flow rate range of the solvent metering pump is 0-500 ml / min; and

[0021] A catalyst metering pump, the input end of the catalyst metering pump is connected to the output end of the catalyst storage tank, and the flow rate range of the catalyst metering pump is 0-5 ml / min.

[0022] Further, the metering tank includes:

[0023] A metering body, the input end of the metering body is respectively connected to the output ends of the monomer metering pump, the solvent metering pump, and the catalyst metering pump;

[0024] A magnetic level gauge, the magnetic level gauge is installed on the metering body for detecting the liquid level of the raw materials in the metering body; and

[0025] A loss-in-weight scale, the loss-in-weight scale is connected to the metering body for measuring the weight change of the raw materials in the metering tank body.

[0026] Further, the effective volume of each of the reaction vessels is 10 L, the working pressure is 2.5 MPa, the working temperature is 150 °C, and the material is S31603 stainless steel.

[0027] Further, the working power of the motor of each of the reaction vessels is 750 W;

[0028] The materials of the stirrer and the sealing component of each of the reaction vessels are both S31603 stainless steel;

[0029] The stirrer of each of the reaction vessels is a stirrer in the form of a double screw ribbon;

[0030] The sealing component of each of the reaction vessels is a magnetic sealing component.

[0031] Further, the continuous reactor for long-chain branched modified rare-earth cis-1,4-polybutadiene rubber further includes:

[0032] A plurality of temperature sensors, which are respectively arranged in each of the reaction vessels and are used to detect the reaction temperature in each of the reaction vessels; and

[0033] A plurality of pressure sensors, which are respectively arranged in each of the reaction vessels and are used to detect the reaction pressure in each of the reaction vessels.

[0034] Further, the continuous reactor for long-chain branched modified rare-earth cis-1,4-polybutadiene rubber further includes:

[0035] A plurality of first sensors, which are respectively arranged on the stirrers of each of the reaction vessels and are used to detect the rotation speed of the stirrers.

[0036] Further, the continuous reactor for long-chain branched modified rare-earth cis-1,4-polybutadiene rubber further includes:

[0037] A plurality of second sensors, which are respectively arranged on the stirrers of each of the reaction vessels and are used to detect the stirring torque of the stirrers.

[0038] Compared with the prior art, the beneficial effects of the present utility model at least include:

[0039] Through the series-connected first, second, and third reactors, the continuous production of long-chain branched modified rare earth cis-polybutadiene rubber is achieved, reducing the transfer and waiting time of materials between different reactors, significantly improving production efficiency, shortening the production cycle, and thus increasing the production capacity and economic benefits of the enterprise. In addition, each reactor is equipped with an independent feed inlet and overflow outlet to ensure uniform mixing and sufficient reaction of materials in the reactor. As the materials gradually flow from the first reactor to the third reactor, each step of the reaction is effectively controlled, making the quality of the final product more stable and the uniformity higher. Further, the inner lining of the third reactor is a polytetrafluoroethylene anti-corrosion film, which can effectively resist the corrosive substances that may be generated during the production process, thereby protecting the inner wall of the reactor from erosion, extending the service life of the equipment, and reducing the maintenance cost. Furthermore, the gas vent at the top of the third reactor and the gas distributor at the bottom of the reactor are both connected to an external gas external circulation system, promoting the uniform distribution and effective circulation of the gas in the reactor, enhancing the mass transfer and heat transfer efficiency during the reaction, facilitating the rapid progress and full completion of the reaction, and improving the output and quality of the product. Description of the Drawings

[0040] Figure 1 It is a schematic structural diagram of the continuous reactor according to the embodiment of the present utility model.

[0041] Figure 2 It is a schematic structural diagram of the metering part of the continuous reactor according to the embodiment of the present utility model.

[0042] Reference numerals: 11, the first reactor; 12, the second reactor; 13, the third reactor; 111, the first feed inlet; 112, the first overflow outlet; 121, the second feed inlet; 122, the second overflow outlet; 131, the third feed inlet; 132, the third overflow outlet; 2, the raw material storage tank; 3, the liquid metering pump; 4, the metering tank. Detailed Embodiments

[0043] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this utility model will be more complete and comprehensive, and will fully convey the concept of the example embodiments to those skilled in the art. Identical reference numerals in the figures denote identical or similar structures, and thus their repeated description will be omitted.

[0044] The words describing positions and directions in the present utility model are all illustrated by way of the attached drawings. However, changes can be made as needed, and all such changes are included within the protection scope of the present utility model. The present utility model aims to provide a continuous reactor for long-chain branched modified rare earth cis-1,4-polybutadiene rubber based on a distributed control system (DCS). This reactor combines long-chain branching modification technology to achieve continuous feeding, reaction, discharging, etc. of raw materials, solve the problems existing in the industrial production process of rare earth cis-1,4-polybutadiene rubber, and improve production efficiency and product quality.

[0045] To improve production efficiency, the continuous reactor for long-chain branched modified rare earth cis-1,4-polybutadiene rubber of the present utility model includes: a first reaction kettle 11, a second reaction kettle 12, and a third reaction kettle 13. Further, to improve product quality, the continuous reactor of the present utility model may also include: a raw material storage tank 2, a liquid metering pump 3, and a metering tank 4. Even further, to improve the monitoring of the production process, the continuous reactor of the present utility model may also include: a temperature sensor, a pressure sensor, a first sensor, and a second sensor.

[0046] The first reaction kettle 11, the second reaction kettle 12, and the third reaction kettle 13 of the present utility model are connected in series in sequence. Moreover, both the first reaction kettle 11 and the second reaction kettle 12 adopt the process of "low inlet and high outlet, full kettle overflow". The third overflow port 132 of the third reaction kettle 13 is opened at the 50% liquid level. Specifically, referring to Figure 1 , the bottom of the first reaction kettle 11 is provided with a first feed inlet 111, and the top of the first reaction kettle 11 is provided with a first overflow port 112; the bottom of the second reaction kettle 12 is provided with a second feed inlet 121, and the top of the second reaction kettle 12 is provided with a second overflow port 122; for the third reaction kettle 13, the bottom of the third reaction kettle 13 is provided with a third feed inlet 131, and the 50% liquid level of the third reaction kettle 13 is provided with a third overflow port 132. Among them, the first overflow port 112 is communicated with the second feed inlet 121, and the second overflow port 122 is communicated with the third feed inlet 131. When the material liquid level in the first reaction kettle 11 reaches the top, the excess material automatically flows into the second reaction kettle 12 through the first overflow port 112. When the material liquid level in the second reaction kettle 12 reaches the top, the excess material automatically flows into the third reaction kettle 13 through the second overflow port 122.

[0047] In order to effectively resist the corrosive substances that may be generated during the production process, the inner lining of the third reactor 13 of the present utility model is provided with a polytetrafluoroethylene anti-corrosion film to improve the service life of the reactor. Further, in order to promote the uniform distribution and effective circulation of the gas phase in the reactor and enhance the mass transfer and heat transfer efficiency during the reaction, the gas phase vent of the lid of the third reactor 13 and the gas phase distributor at the bottom of the third reactor 13 of the present utility model are both connected to an external gas phase external circulation system, which is beneficial to the rapid progress and full completion of the reaction, and can also improve the output and quality of the product.

[0048] In addition, in order to detect the reaction temperature in each reactor, at least one temperature sensor is provided in each reactor of the present utility model, and the temperature sensor is installed at a position that can accurately reflect the overall temperature in the reactor or the key reaction area to ensure that the reaction proceeds under suitable temperature conditions, thereby improving the stability of the reaction and the quality of the product. Further, in order to detect the reaction pressure in each reactor, at least one pressure sensor is provided in each reactor of the present utility model, and it is installed at a position that can accurately measure the pressure in the reactor, such as specific positions near the top or bottom of the reactor, to ensure that the reaction proceeds within a safe pressure range and prevent safety accidents or a decrease in reaction efficiency caused by too high or too low pressure. Further, the effective volume of each reactor of the present utility model is 10L, the working pressure is 2.5MPa, the working temperature is 150°C, and the material is S31603 stainless steel, which has good corrosion resistance and high temperature resistance, can meet the use requirements of the reactor under harsh working conditions, and extend the service life of the equipment.

[0049] In addition, in order to detect the rotation speed of the stirrer, a first sensor is provided on the stirrer in each reactor of the present utility model to monitor and transmit the rotation speed data of the stirrer to the DCS control system, so that the staff can always master the stirring state and make adjustments as needed to ensure that the stirrer can operate at an accurate and stable rotation speed, thereby improving the material mixing efficiency and reaction uniformity in the reactor. In order to detect the stirring torque of the stirrer, a second sensor is provided on the stirrer of each reactor of the present utility model to monitor the torque required during the stirring process and record and analyze it through the DCS control system. When the torque is abnormal (such as too large or too small), the DCS control system can issue an alarm or take corresponding measures to avoid equipment damage or a decrease in reaction efficiency.

[0050] To be applicable to high-viscosity materials and improve the stirring efficiency, the stirrers of each reactor of the present utility model are all set as stirrers in the form of double screw ribbons. To prevent the leakage of materials in the reactor and the intrusion of external impurities, and ensure the safety of the reaction process and the product quality, the sealing components of each reactor of the present utility model are all set as magnetic sealing components. To further improve the characteristics such as high temperature resistance, acid and alkali corrosion resistance and mechanical strength, the materials of the stirrer and the sealing component are both set as S31603 stainless steel to ensure the long-term stable operation of the stirrer and the sealing component under harsh working conditions. Further, to ensure that the motor provides sufficient power while avoiding problems such as energy waste and equipment overheating, the working power of the motor of each reactor is 750W.

[0051] Reference Figure 2 , the raw material storage tank 2 of the present utility model is used to store raw materials. The output end of the raw material storage tank 2 is connected to the input end of the liquid metering pump 3. The output end of the liquid metering pump 3 is connected to the input end of the metering tank 4. The output end of the metering tank 4 is connected to the first feed port 111.

[0052] The raw material storage tank 2 of the present utility model includes: a monomer storage tank for storing monomer raw materials, a solvent storage tank for storing solvent raw materials, and a catalyst storage tank for storing catalyst raw materials. Further, the liquid metering pump 3 of the present utility model includes: a monomer metering pump with a flow range of 0-100 ml / min, a solvent metering pump with a flow range of 0-500 ml / min, and a catalyst metering pump with a flow range of 0-5 ml / min. Still further, the metering tank 4 of the present utility model includes: a metering body, a magnetic level gauge, and a loss-in-weight scale. Specifically, the output end of the monomer storage tank is connected to the input end of the monomer metering pump; the output end of the solvent storage tank is connected to the input end of the solvent metering pump; the output end of the catalyst storage tank is connected to the input end of the catalyst metering pump. The output ends of the monomer metering pump, the solvent metering pump, and the catalyst metering pump are all connected to the input end of the metering body. Further, in order to detect the liquid level of the raw materials in the metering body, a magnetic level gauge is provided on the metering body to accurately monitor the liquid level of the raw materials in the tank, providing an important basis for the control and adjustment of the production process. Still further, in order to measure the weight change of the raw materials in the tank body, the metering body is connected to a loss-in-weight scale to monitor the weight change of the raw materials in the tank, so as to understand the consumption of the raw materials and provide data support for the formulation and adjustment of the production plan.

[0053] During application, the raw materials are stored in monomer storage tanks, solvent storage tanks and catalyst storage tanks respectively. According to production requirements, the raw materials in each storage tank are accurately metered by corresponding liquid metering pumps and then transported to metering tank 4 for mixing. The mixed raw materials in metering tank 4 enter the first reactor 11 through the output end to start the reaction process. The reaction materials pass through the first reactor 11 and the second reactor 12 in sequence and finally enter the third reactor 13 for final reaction and treatment. During the whole process, the stirrers of each reactor keep working to promote the reaction; the gas-phase external circulation system ensures the uniform distribution and effective circulation of the gas phase; the sensors monitor the rotation speed and torque of the stirrers in real time to ensure stable reaction conditions.

[0054] Traditional rubber synthesis reactors mostly adopt manual or semi-automatic control methods, which have problems such as complex operation, low control accuracy and low production efficiency. With the development of industrial automation technology, the DCS system has been widely used in fields such as chemical industry, petroleum and pharmaceuticals due to its high reliability, high stability and powerful control capabilities. Introducing the DCS system into the synthesis reactor of rare earth cis-1,4-polybutadiene rubber can realize the automatic control and remote monitoring of the production process, improving production efficiency and product quality. The DCS of the present utility model includes: a data acquisition unit, a data processing and decision-making unit, and a program control unit. Among them, the data acquisition unit is used to collect various data of the reactor; the data processing and decision-making unit is used to process and analyze the collected data, and make decisions and issue control instructions according to preset algorithms and models; the program control unit is used to send the control instructions to the corresponding actuators of the reactor.

[0055] In summary, the present utility model provides a continuous production reactor for rare earth cis-1,4-polybutadiene rubber that is efficient, stable and controllable by introducing DCS and long-chain branching modification technology. The structure and operation process of the reactor improve the mass transfer and heat transfer efficiency, reduce energy consumption and production costs, providing strong support for the industrial production and application of rare earth cis-1,4-polybutadiene rubber.

[0056] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Without departing from the principles and purposes of the present utility model, those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present utility model, and all these changes should fall within the protection scope of the claims of the present utility model.

Claims

1. A continuous reactor for long-chain branched modified rare earth butadiene rubber, characterized in that: include: A first reaction kettle (11), wherein a first feed port (111) is provided at the bottom of the first reaction kettle (11), and a first overflow port (112) is provided at the top of the first reaction kettle (11); a second reaction kettle (12), wherein a second feed port (121) is provided at the bottom of the second reaction kettle (12), the second feed port (121) is connected to the first overflow port (112), and a second overflow port (122) is provided at the top of the second reaction kettle (12); and A third reaction kettle (13), wherein a third feed port (131) is provided at the bottom of the third reaction kettle (13), wherein the third feed port (131) is connected to the second overflow port (122), and a third overflow port (132) is provided at a liquid level greater than or equal to 50% of the third reaction kettle (13), wherein the third reaction kettle (13) is lined with a polytetrafluoroethylene anti-corrosion film, and the gas phase venting port of the kettle cover of the third reaction kettle (13) and the gas phase distributor at the bottom of the third reaction kettle (13) are both connected to an external gas phase external circulation system.

2. The continuous reactor of long-chain branched modified rare earth butadiene rubber according to claim 1, characterized in that: Also includes: A raw material storage tank (2), used for storing raw materials; A liquid metering pump (3), wherein the input end of the liquid metering pump (3) is connected to the output end of the raw material storage tank (2); as well as A metering tank (4), wherein the input end of the metering tank (4) is connected to the output end of the liquid metering pump (3), and the output end of the metering tank (4) is connected to the first feed port (111).

3. The continuous reactor of long-chain branched modified rare earth butadiene rubber according to claim 2, characterized in that: The raw material storage tank (2) comprises: A monomer storage tank, the output end of which is connected to the input end of the liquid metering pump (3); a solvent storage tank, the output end of the solvent storage tank being connected to the input end of the liquid metering pump (3); and A catalyst storage tank, wherein the output end of the catalyst storage tank is connected to the input end of the liquid metering pump (3).

4. The continuous reactor of long-chain branched modified rare earth butadiene rubber according to claim 3, characterized in that: The liquid metering pump (3) comprises: A monomer metering pump, the input end of the monomer metering pump is connected to the output end of the monomer storage tank, and the flow range of the monomer metering pump is 0-100 ml / min; a solvent metering pump, wherein the input end of the solvent metering pump is connected to the output end of the solvent storage tank, and the flow rate range of the solvent metering pump is 0-500 ml / min; and A catalyst metering pump, wherein the input end of the catalyst metering pump is connected to the output end of the catalyst storage tank, and the flow range of the catalyst metering pump is 0-5 ml / min.

5. The continuous reactor of long-chain branched modified rare earth butadiene rubber according to claim 4, characterized in that: The metering tank (4) comprises: A metering body, the input end of which is respectively connected to the output end of the monomer metering pump, the output end of the solvent metering pump, and the output end of the catalyst metering pump; A magnetic level gauge, which is mounted on the metering body and is used to detect the liquid level of the raw material in the metering body; and A loss-in-weight scale is connected to the metering body and is used to measure the weight change of the raw materials in the measuring tank body.

6. The continuous reactor of long-chain branched modified rare earth butadiene rubber according to claim 1, characterized in that: The effective volume of each reactor is 10L, the working pressure is 2.5MPa, the working temperature is 150°C, and the material is S31603 stainless steel.

7. The continuous reactor of long-chain branched modified rare earth butadiene rubber according to claim 1, characterized in that: The working power of the motor of each reactor is 750W; The agitator and sealing components of each reactor are made of S31603 stainless steel; The agitators of each of the reactors are agitators of the double-screw ribbon stirring type; The sealing components of each of the reaction kettles are magnetic sealing components.

8. The continuous reactor of long-chain branched modified rare earth butadiene rubber according to claim 1, characterized in that: Also includes: A plurality of temperature sensors, each of which is disposed in each of the reaction kettles and is used to detect the reaction temperature in each of the reaction kettles; as well as A plurality of pressure sensors are respectively arranged in each of the reaction kettles to detect the reaction pressure in each of the reaction kettles.

9. The continuous reactor of long-chain branched modified rare earth butadiene rubber according to claim 1, characterized in that: Also includes: A plurality of first sensors are respectively arranged on the agitator of each of the reaction kettles and are used to detect the rotation speed of the agitator.

10. The continuous reactor of long-chain branched modified rare earth butadiene rubber according to claim 1, characterized in that: Also includes: A plurality of second sensors are arranged on the agitators of the reaction kettles respectively, and are used to detect the stirring torque of the agitators.

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