Feeding device for alkoxylation reaction

Abstract

The utility model relates to the technical field of chemical reaction equipment, and particularly discloses a feeding device for alkoxylation reaction, which comprises a feeding main pipe, a mixing cavity and a discharging branch pipe, the feeding main pipe comprises a liquid feeding pipe and a solid feeding pipe, and the outlet ends of the two channel pipes are both communicated with the mixing cavity; a spiral conveying mechanism is arranged at the inlet end of the solid feeding pipe; a static flow guide ring and a dynamic stirring paddle are arranged in the mixing cavity, the static flow guide ring spirally extends along the inner wall of the mixing cavity, the screw pitch of a blade is gradually reduced from top to bottom, the dynamic stirring paddle is a turbine stirrer, and a rotating motor coaxially and fixedly connected with the turbine stirrer is arranged at the top of the mixing cavity; liquid and solid are fed in different channels and are independently preheated, so that continuous and stable feeding and uniform and efficient mixing are realized, meanwhile, ultrasonic assistance and intelligent temperature control are combined, the reaction efficiency and the process control precision are remarkably improved, and the product quality and the production efficiency are favorably improved.

Description

Technical Field

[0001] This utility model relates to the field of chemical reaction equipment technology, and specifically discloses a feeding device for alkoxylation reaction. Background Technology

[0002] In alkoxylation reactions (such as ethoxylation, propoxylation, etc.), it is usually necessary to efficiently mix solid catalysts / reactants (such as alkali metal hydroxides, alkoxides, etc.) with liquid raw materials (such as ethylene oxide, alcohols, etc.) to ensure uniform reaction and improve product purity and yield.

[0003] However, traditional feeding and mixing methods have the following technical problems:

[0004] Uneven mixing of liquid and solid raw materials can lead to the agglomeration of solid particles, resulting in insufficient dispersion, excessively high local concentrations in the reaction, and an increase in by-products. In particular, powdery or granular solids tend to accumulate in the feed pipe, especially highly hygroscopic materials (such as KOH), which can easily cause conveying interruptions and affect continuous production. At the same time, existing equipment mostly uses single mechanical stirring (such as paddle or anchor stirring), which makes it difficult to achieve nanoscale uniform mixing, thus affecting reaction efficiency.

[0005] Therefore, there is an urgent need to develop a feeder for alkoxylation reactions to solve the above problems. Utility Model Content

[0006] This invention proposes a feeding device for alkoxylation reactions. Through innovative designs such as dual-channel feeding, composite mixing chamber, ultrasonic assistance, and intelligent preheating control, the device solves problems such as uneven liquid-solid mixing, clogging, and low temperature control accuracy, providing reliable equipment support for continuous and efficient alkoxylation reactions.

[0007] This invention is implemented as follows: a feeding device for alkoxylation reaction includes a main feeding pipe, a mixing chamber and a branch outlet pipe. The main feeding pipe includes a liquid feeding pipe and a solid feeding pipe, and the outlet ends of both pipes are connected to the mixing chamber.

[0008] The inlet end of the solid feed pipe is equipped with a screw conveying mechanism;

[0009] The mixing chamber is equipped with a static guide ring and a dynamic stirring blade. The static guide ring extends spirally along the inner wall of the mixing chamber, and the blade pitch gradually decreases from top to bottom. The dynamic stirring blade is a turbine stirrer. A rotary motor is provided at the top of the mixing chamber and is coaxially fixed to the turbine stirrer.

[0010] The mixing chamber has at least two symmetrically distributed ultrasonic vibration transducers on its outer side.

[0011] The discharge end of the mixing chamber is connected to the discharge branch pipe through a tapered transition section;

[0012] Both the liquid feed pipe and the solid feed pipe are wrapped with a preheating jacket. The preheating jacket is provided with a serpentine flow channel, which allows the heating medium to flow in one direction to achieve uniform preheating. The serpentine flow channel is provided with staggered turbulence protrusions.

[0013] As a preferred embodiment of the feeding device for alkoxylation reaction of this utility model, the screw conveying mechanism includes a conveying cylinder with a feeding port on its outer wall and an auger disposed inside the conveying cylinder. One end of the conveying cylinder is connected to a solid feed pipe through a flange, one end of the auger extends to the outlet end of the solid feed pipe, and the other end of the conveying cylinder is provided with a conveying motor coaxially fixed to the other end of the auger.

[0014] As a preferred embodiment of the feeding device for alkoxylation reaction of this utility model, an electromagnetic flow meter and a pneumatic regulating valve are connected in series on the liquid feed pipe.

[0015] In a preferred embodiment of the feeding device for alkoxylation reaction according to this utility model, the height of the turbulence protrusion is 1 / 5 to 1 / 3 of the channel height, and the spacing between adjacent turbulence protrusions is 2 to 3 times the channel width.

[0016] As a preferred embodiment of the feeding device for alkoxylation reaction of this utility model, temperature sensors are provided at both the inlet and outlet of the preheating jacket, and a metering controller connected to the temperature sensors is provided on the mixing chamber. The metering controller is also electrically connected to an electromagnetic flow meter and a pneumatic regulating valve. The metering controller dynamically adjusts the opening of the pneumatic regulating valve according to the feedback signal from the temperature sensors.

[0017] As a preferred feeding device for alkoxylation reaction according to the present invention, the initial pitch of the static guide ring is 1.2 times the diameter of the mixing chamber, and the final pitch is reduced to 0.5 times the diameter of the mixing chamber.

[0018] As a preferred embodiment of the feeding device for alkoxylation reaction of this utility model, the ultrasonic vibration transducer has an operating frequency of 20-40kHz and a power density of 50-100W / L.

[0019] The beneficial effects of this utility model are:

[0020] 1. This feeding device, by setting up separate feed pipes for liquids and solids and preheating them separately, enables the liquid and solid raw materials to reach a suitable temperature before entering the mixing chamber, which is beneficial for subsequent mixing and reaction.

[0021] 2. The combination of static guide rings and dynamic stirring paddles in the mixing chamber, along with the ultrasonic vibration transducer, enables mixing in multiple ways, improving the uniformity and efficiency of mixing and promoting the alkoxylation reaction.

[0022] 3. The screw conveyor mechanism can stably and evenly transport solid raw materials, ensuring the continuity and stability of feeding.

[0023] 4. The installation of electromagnetic flow meters and pneumatic regulating valves on the liquid feed pipe, as well as temperature sensors and metering controllers on the preheating jacket, enables precise control of feed temperature and flow rate, improves the automation level and process control accuracy of the feeding process, and is conducive to improving product quality and production efficiency. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0026] Figure 2 This is a cross-sectional view of the preheating jacket of this utility model.

[0027] Figure 3 This is a cross-sectional structural diagram of the spiral conveying mechanism of this utility model.

[0028] Figure 4 This is a schematic diagram of the structure of the dynamic stirring paddle of this utility model.

[0029] The markings in the diagram are: 1. Main feed pipe; 2. Mixing chamber; 3. Discharge branch pipe; 4. Liquid feed pipe; 5. Solid feed pipe; 6. Screw conveyor mechanism; 7. Static guide ring; 8. Dynamic stirring paddle; 9. Rotary motor; 10. Ultrasonic vibration transducer; 11. Tapered transition section; 12. Preheating jacket; 13. Serpentine diversion channel; 14. Turbulence protrusion; 15. Feed port; 16. Conveying cylinder; 17. Screw conveyor; 18. Conveying motor; 19. Electromagnetic flow meter; 20. Pneumatic regulating valve; 21. Temperature sensor; 22. Metering controller. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0031] Please see Figure 1-4A feeding device for alkoxylation reaction includes a main feed pipe 1, a mixing chamber 2 and a discharge branch pipe 3. The main feed pipe 1 includes a liquid feed pipe 4 and a solid feed pipe 5, and the outlet ends of both pipes are connected to the mixing chamber 2.

[0032] A screw conveyor mechanism 6 is provided at the inlet end of the solid feed pipe 5;

[0033] The mixing chamber 2 is equipped with a static guide ring 7 and a dynamic stirring blade 8. The static guide ring 7 extends spirally along the inner wall of the mixing chamber 2, and the blade pitch gradually decreases from top to bottom. The dynamic stirring blade 8 is a turbine stirrer. The top of the mixing chamber 2 is equipped with a rotary motor 9 that is coaxially fixed to the turbine stirrer.

[0034] At least two symmetrically distributed ultrasonic transducers 10 are provided on the outer side of the mixing chamber 2.

[0035] The discharge end of the mixing chamber 2 is connected to the discharge branch pipe 3 through the tapered transition section 11;

[0036] Both the liquid feed pipe 4 and the solid feed pipe 5 are wrapped with a preheating jacket 12. The preheating jacket 12 is provided with a serpentine diversion channel 13, which allows the heating medium to flow in one direction to achieve uniform preheating. The serpentine diversion channel 13 is provided with staggered turbulence protrusions 14.

[0037] In this embodiment: solid raw materials enter the conveying cylinder 16 through the feeding port 15 of the screw conveyor 6. The screw conveyor 17 is driven by the conveying motor 18 to transport the solid raw materials to the mixing chamber 2. Liquid raw materials are transported through the liquid feed pipe 4. The electromagnetic flowmeter 19 measures the liquid flow rate in real time, and the pneumatic regulating valve 20 adjusts the liquid feed rate according to the signal of the metering controller 22. At the same time, the liquid raw materials are preheated by the heating medium in the preheating jacket 12. The temperature sensor 21 monitors the temperature of the inlet and outlet of the preheating jacket 12 in real time and feeds the data back to the metering controller 22. The metering controller 22 controls the electromagnetic flowmeter 19 and the pneumatic regulating valve 20 according to the temperature data and preset parameters to ensure that the liquid raw materials enter the mixing chamber 2 at a suitable temperature and flow rate. In the mixing chamber 2, the static guide ring 7 guides the fluid to form a specific flow path, the dynamic stirring paddle 8 stirs the fluid, and the ultrasonic vibration transducer 10 generates ultrasonic vibration to promote the mixing of liquid and solid raw materials and the interaction between molecules. The mixed material enters the discharge branch pipe 3 through the tapered transition section 11 and is discharged from the feeding device.

[0038] As a technical optimization of this utility model, the screw conveyor mechanism 6 includes a conveying cylinder 16 with a feeding port 15 on its outer wall and an auger 17 disposed inside the conveying cylinder 16. One end of the conveying cylinder 16 is connected to the solid feed pipe 5 through a flange, and one end of the auger 17 extends to the outlet end of the solid feed pipe 5. The other end of the conveying cylinder 16 is provided with a conveying motor 18 that is coaxially fixed to the other end of the auger 17.

[0039] In this embodiment: solid raw materials enter the conveying cylinder 16 through the feeding port 15, the conveying motor 18 is started, and the auger 17 rotates, which makes it easy to transport the solid raw materials into the mixing chamber 2, ensuring the stability and reliability of the solid raw material conveying. Moreover, the auger 17 extends to the outlet end, which can ensure that the solid material completely enters the mixing chamber 2 and reduces residue.

[0040] As a technical optimization of this utility model, an electromagnetic flow meter 19 and a pneumatic regulating valve 20 are connected in series on the liquid feed pipe 4.

[0041] In this embodiment, the accuracy and adjustability of the feed are improved by precisely controlling the liquid feed flow rate.

[0042] As a technical optimization of this utility model, the height of the turbulence protrusion 14 is 1 / 5 to 1 / 3 of the channel height, and the spacing between adjacent turbulence protrusions 14 is 2 to 3 times the channel width.

[0043] In this embodiment, by reasonably setting the parameters of the turbulence protrusion 14, the overall preheating uniformity is improved, local overheating or insufficient heating is avoided, and the heat exchange efficiency between the heating medium and the pipeline is improved.

[0044] As a technical optimization of this utility model, temperature sensors 21 are provided at both the inlet and outlet of the preheating jacket 12, and a metering controller 22 connected to the temperature sensors 21 is provided on the mixing chamber 2. The metering controller 22 is also electrically connected to the electromagnetic flowmeter 19 and the pneumatic regulating valve 20. The metering controller 22 dynamically adjusts the opening of the pneumatic regulating valve 20 according to the feedback signal from the temperature sensors 21.

[0045] In this embodiment: the inlet and outlet temperature sensors 21 monitor the preheating status in real time to ensure that the raw materials reach the set temperature; the metering controller 22, in conjunction with the electromagnetic flow meter 19 and the pneumatic regulating valve 20, realizes the automated and precise control of the feed temperature and flow rate, improving the stability and control accuracy of the feeding process.

[0046] As a technical optimization of this utility model, the initial pitch of the static guide ring 7 is 1.2 times the diameter of the mixing chamber 2, and the final pitch is reduced to 0.5 times the diameter of the mixing chamber 2.

[0047] In this embodiment, the pitch of the static guide ring 7 varies from 1.2 times the cavity diameter at the beginning to 0.5 times the cavity diameter at the end. The large pitch at the beginning reduces inlet resistance and ensures smooth material entry; the small pitch at the end enhances shear force, prolongs mixing time, improves dispersion effect, optimizes the overall flow field distribution, and avoids dead zones or short-circuit flow; thus enabling it to better guide fluid flow in the mixing chamber 2 and enhance the mixing effect.

[0048] As a technical optimization of this utility model, the ultrasonic vibration transducer 10 has a working frequency of 20-40kHz and a power density of 50-100W / L.

[0049] In this embodiment, ultrasonic vibration transducers 10 are symmetrically installed on the outside of the mixing chamber 2. They break up particle agglomeration through high-frequency vibration, thus assisting in mixing. The ultrasonic vibration transducers 10 improve reaction efficiency, reduce catalyst usage, and lower energy consumption. This ensures that the raw materials can effectively promote mixing and reaction within the mixing chamber 2, thereby improving the working performance and effectiveness of the ultrasonic vibration transducers 10.

[0050] Working principle and usage process of this utility model:

[0051] The conveyor motor 18 is started, causing the auger 17 to rotate and convey the solid raw material from the feed port 15 to the solid feed pipe 5. At the same time, the valve on the liquid feed pipe 4 (the liquid feed channel is connected to the outlet pipe of the storage pipe) is opened to start conveying the liquid raw material. During the conveying process, the electromagnetic flowmeter 19 measures the flow rate in real time, and the pneumatic regulating valve 20 adjusts the flow rate according to the instructions of the metering controller 22. Meanwhile, the heating medium in the preheating jacket 12 preheats the liquid raw material through the serpentine diversion channel 13, and the temperature sensor 21 monitors the temperature at the inlet and outlet of the preheating jacket 12 and feeds the data back to the metering controller 22. 2; Solid raw materials enter the mixing chamber 2 through the solid feed pipe 5, and liquid raw materials also enter the mixing chamber 2 at the same time; Inside the mixing chamber 2, the static guide ring 7 guides the fluid flow, the dynamic stirring paddle 8 stirs, and the ultrasonic transducer 10 generates ultrasonic vibration to fully mix the liquid and solid raw materials; The mixed material enters the discharge branch pipe 3 through the tapered transition section 11 and is finally discharged from the feeding device; Throughout the process, the metering controller 22 adjusts the opening of the pneumatic regulating valve 20 in real time based on the data fed back by the temperature sensor 21 and the electromagnetic flowmeter 19 to ensure stable and accurate control of the feed temperature and flow rate.

[0052] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0053] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A feeding device for an alkoxylation reaction, comprising a main feed pipe (1), a mixing chamber (2), and a discharge branch pipe (3), characterized in that: The feed main pipe (1) includes a liquid feed pipe (4) and a solid feed pipe (5), and the outlet ends of both pipes are connected to the mixing chamber (2); The inlet end of the solid feed pipe (5) is provided with a screw conveying mechanism (6); The mixing chamber (2) is provided with a static guide ring (7) and a dynamic stirring paddle (8). The static guide ring (7) extends spirally along the inner wall of the mixing chamber (2), and the blade pitch gradually decreases from top to bottom. The dynamic stirring paddle (8) is a turbine stirrer. The top of the mixing chamber (2) is provided with a rotary motor (9) coaxially fixed to the turbine stirrer. The mixing cavity (2) has at least two symmetrically distributed ultrasonic vibration transducers (10) on its outer side. The discharge end of the mixing chamber (2) is connected to the discharge branch pipe (3) through a tapered transition section (11); Both the liquid feed pipe (4) and the solid feed pipe (5) are wrapped with a preheating jacket (12). The preheating jacket (12) is provided with a serpentine diversion channel (13). The serpentine diversion channel (13) allows the heating medium to flow in one direction to achieve uniform preheating. The serpentine diversion channel (13) is provided with staggered turbulence protrusions (14).

2. The feeding device for an alkoxylation reaction according to claim 1, characterized in that: The screw conveyor mechanism (6) includes a conveying cylinder (16) with a feeding port (15) on its outer wall and an auger (17) inside the conveying cylinder (16). One end of the conveying cylinder (16) is connected to the solid feed pipe (5) through a flange. One end of the auger (17) extends to the outlet end of the solid feed pipe (5). The other end of the conveying cylinder (16) is provided with a conveying motor (18) that is coaxially fixed to the other end of the auger (17).

3. The feeding device for an alkoxylation reaction according to claim 1, characterized in that: An electromagnetic flow meter (19) and a pneumatic regulating valve (20) are connected in series on the liquid feed pipe (4).

4. The feeding device for an alkoxylation reaction according to claim 1, characterized in that: The height of the turbulence protrusion (14) is 1 / 5 to 1 / 3 of the channel height, and the spacing between adjacent turbulence protrusions (14) is 2 to 3 times the channel width.

5. The feeding device for an alkoxylation reaction according to claim 3, characterized in that: Temperature sensors (21) are provided at both the inlet and outlet of the preheating jacket (12). A metering controller (22) connected to the temperature sensor (21) is provided on the mixing chamber (2). The metering controller (22) is also electrically connected to the electromagnetic flow meter (19) and the pneumatic regulating valve (20). The metering controller (22) dynamically adjusts the opening of the pneumatic regulating valve (20) according to the feedback signal from the temperature sensor (21).

6. The feeding device for an alkoxylation reaction according to claim 1, characterized in that: The initial pitch of the static guide ring (7) is 1.2 times the diameter of the mixing chamber (2), and the final pitch is reduced to 0.5 times the diameter of the mixing chamber (2).

7. The feeding device for an alkoxylation reaction according to claim 1, characterized in that: The ultrasonic vibration transducer (10) operates at a frequency of 20-40kHz and has a power density of 50-100W / L.

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