A phenolic resin polycondensation reactor

Abstract

The utility model relates to the technical field of chemical equipment discloses a phenolic resin polycondensation reaction kettle, including kettle body, the top fixed mounting of kettle body has the kettle cover, the top fixed mounting of kettle cover has the manhole and the feed pipe, the bottom fixed mounting of kettle body has the discharge pipe, the inside of kettle body is provided with stirring mechanism and foam breaking mechanism, the bottom mounting of kettle body has supplementary defoaming mechanism, the utility model discloses through the cooperation and cooperation of stirring mechanism, foam breaking mechanism and scraper, can realize in material stirring process: physical broken rising foam, prevent its in kettle body upper portion and kettle cover inner wall accumulation break, significantly reduce the difficulty of cleaning, synchronous scraping off the adhesion of kettle body inner wall, keeps the heat transfer efficiency, cooperates the foam intercepting function of multilayer stainless steel wire net, finally makes resin adhesion amount to reduce below 1%, dehydration efficiency improves 40% or above, especially suitable for the production of high viscosity phenolic resin.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, specifically to a phenolic resin polycondensation reactor. Background Technology

[0002] The phenolic resin condensation reactor is a key piece of equipment used to produce phenolic resin (an important thermosetting plastic). Its main function is to polymerize phenols (such as phenol) and aldehydes (such as formaldehyde) under specific conditions through a condensation reaction to form phenolic resin.

[0003] For example, Chinese utility model patent CN221062690U discloses an environmentally friendly heating device for a phenolic resin reactor. This device not only ensures more uniform heating of the raw material liquid within the reactor chamber, increasing the rate of polycondensation reaction, but also offers energy savings, environmental friendliness, and high practicality and reliability. It includes a base plate, a support frame, a reactor, and an inlet pipe. The reactor is fixedly mounted on the upper part of the base plate via the support frame. The reactor contains a chamber, and the inlet pipe is installed on the upper part of the reactor with a valve. A drain pipe is installed at the lower part of the reactor. The device also includes a stirring device, a microwave generator, and a power supply. The microwave generator is installed inside the reactor and emits microwaves. The power supply provides power to the microwave generator. The stirring device is mounted on the reactor and has a stirring function.

[0004] The above technical solution has the following problems: In the polycondensation reaction of phenolic resin, the vacuum dehydration stage is a critical process. However, due to severe foaming during this stage, the resin adheres to the inner wall of the reactor. Currently, the industry suffers from the following technical defects:

[0005] Foaming causes resin to stick to the wall

[0006] During vacuum dehydration, moisture and volatile substances (such as formaldehyde) in the resin evaporate rapidly, generating a large amount of foam. When the foam bursts, resin droplets splash and adhere to the vessel walls and top, forming an uneven scale layer, which in turn leads to:

[0007] Raw material waste (adhesion amount can reach 5% to 10%);

[0008] Reduced heat transfer efficiency (scale buildup hinders heat exchange in the jacket or coil);

[0009] Cleaning is difficult, increasing downtime and labor costs. Utility Model Content

[0010] The purpose of this invention is to provide a phenolic resin polycondensation reactor to solve the problems mentioned in the background art.

[0011] To achieve the above objectives, this utility model provides the following technical solution:

[0012] A phenolic resin polycondensation reactor includes a reactor body, a reactor cover fixedly installed on the top of the reactor body, a manhole and a feed pipe fixedly installed on the top of the reactor cover, a discharge pipe fixedly installed on the bottom of the reactor body, a stirring mechanism and a foam breaking mechanism arranged inside the reactor body, and an auxiliary defoaming mechanism installed at the bottom of the reactor body.

[0013] Furthermore, the stirring mechanism includes a motor, which is fixedly installed on the top of the vessel lid. The output shaft of the motor is fixedly connected to a rotating rod, a stirring shaft is fixedly installed at the bottom of the rotating rod, and a stirring rod is fixedly installed on the outer side of the stirring shaft.

[0014] Furthermore, the foam breaking mechanism includes a rotating plate, which is fixedly installed on the outside of the stirring shaft and above the stirring rod. Several first saw teeth are fixedly installed on the outside of the rotating plate, and the several first saw teeth are evenly distributed with the center of the rotating plate as the center point. Several through holes are opened inside the rotating plate, and several second saw teeth are fixedly installed inside the through holes.

[0015] Furthermore, a grid plate is fixedly installed on the inner side of the lid and above the rotating plate. The grid plate has three layers, which are arranged alternately. The aperture of the grid plate is 0.5-1mm, and the grid plate is made of stainless steel wire mesh.

[0016] Furthermore, a connecting frame is threaded onto the outer side of the stirring rod, and a scraper is fixedly installed on the side of the connecting frame away from the stirring rod. The scraper is made of PTFE flexible material.

[0017] Furthermore, the auxiliary defoaming mechanism includes an air intake frame, which is fixedly installed at the bottom of the vessel body. Several nozzles are fixedly installed on the top of the air intake frame, and the nozzles are evenly distributed with the center of the air intake frame as the center point. An air intake pipe is fixedly connected to the bottom of the air intake frame.

[0018] Furthermore, a spiral pipe is fixedly installed on the outer side of the vessel body, a steam inlet is fixedly connected to the top of the spiral pipe, a steam outlet is fixedly connected to the side of the spiral pipe, and a condensate outlet is fixedly connected to the bottom of the spiral pipe.

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

[0020] 1. This utility model, through the coordinated operation of a stirring mechanism, a foam breaking mechanism, and a scraper, can achieve the following during the material stirring process: physical breaking of rising foam to prevent it from accumulating and breaking on the upper part of the vessel and the inner wall of the vessel lid, significantly reducing the difficulty of cleaning; simultaneous scraping of the adhering material on the inner wall of the vessel to maintain heat transfer efficiency; and, in conjunction with the foam interception function of multi-layer stainless steel wire mesh, ultimately reducing the resin adhesion to below 1% and increasing the dehydration efficiency by more than 40%, making it particularly suitable for the production of high-viscosity phenolic resin.

[0021] 2. This utility model uses an auxiliary defoaming mechanism at the bottom of the vessel to introduce a small amount of nitrogen (0.1-0.3 bar) during the dehydration stage, which uses rising bubbles to physically break the foam structure and effectively suppress foam generation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a cross-sectional structural diagram of the vessel body of this utility model;

[0024] Figure 3 This is a structural schematic diagram of the grating plate of this utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the foam breaking mechanism of this utility model;

[0026] Figure 5 This is a cross-sectional structural diagram of the stirring rod and connecting frame of this utility model;

[0027] Figure 6 This is a schematic diagram of the auxiliary defoaming mechanism of this utility model.

[0028] Reference numerals: 1. Vessel body; 2. Vessel lid; 3. Manhole; 4. Feed pipe; 5. Discharge pipe; 6. Stirring mechanism; 601. Motor; 602. Rotating rod; 603. Stirring shaft; 604. Stirring rod; 7. Foam breaking mechanism; 701. Grating plate; 702. Rotating plate; 703. First sawtooth; 704. Through hole; 705. Second sawtooth; 8. Connecting frame; 9. Scraper; 10. Auxiliary defoaming mechanism; 1001. Air inlet frame; 1002. Nozzle; 1003. Air inlet pipe; 11. Spiral pipe; 12. Steam inlet; 13. Steam outlet; 14. Condensate outlet. Detailed Implementation

[0029] The present invention will be further described below with reference to specific embodiments. However, those skilled in the art should understand that the detailed description given here with reference to the accompanying drawings is for better explanation. The structure of the present invention may exceed the limited embodiments described herein. Some equivalent alternatives or common means will not be described in detail here, but they still fall within the protection scope of this application.

[0030] Figures 1-6 This is the preferred embodiment of the present invention, which is described below in conjunction with... Figures 1-6 The present invention will be further described below.

[0031] A phenolic resin polycondensation reactor includes a reactor body 1, a reactor cover 2 fixedly installed on the top of the reactor body 1, a manhole 3 and a feed pipe 4 fixedly installed on the top of the reactor cover 2, a discharge pipe 5 fixedly installed on the bottom of the reactor body 1, a stirring mechanism 6 and a foam breaking mechanism 7 arranged inside the reactor body 1, and an auxiliary defoaming mechanism 10 installed at the bottom of the reactor body 1. Specifically, by using the stirring mechanism 6 and the foam breaking mechanism 7 together, not only can the materials be stirred, but the rising foam can also be physically broken to prevent it from accumulating and breaking on the upper part of the reactor body 1 and the inner wall of the reactor cover 2, while scraping off the adhering material on the inner wall of the reactor body 1; the auxiliary defoaming mechanism 10 can effectively suppress foam generation.

[0032] The stirring mechanism 6 includes a motor 601, which is fixedly installed on the top of the vessel cover 2. The output shaft of the motor 601 is fixedly connected to a rotating rod 602. A stirring shaft 603 is fixedly installed at the bottom of the rotating rod 602, and a stirring rod 604 is fixedly installed on the outside of the stirring shaft 603. Specifically, the rotating rod 602 is driven to rotate by the motor 601, which in turn drives the stirring shaft 603 and the stirring rod 604 to rotate together, causing the vessel body 1 to move.

[0033] The foam breaking mechanism 7 includes a rotating plate 702, which is fixedly installed on the outside of the stirring shaft 603 and above the stirring rod 604. Several first serrations 703 are fixedly installed on the outside of the rotating plate 702, and the several first serrations 703 are evenly distributed with the center of the rotating plate 702 as the center point. Several through holes 704 are opened inside the rotating plate 702, and several second serrations 705 are fixedly installed inside the through holes 704. Specifically, when the stirring shaft 603 rotates, the rotating plate 702 will also rotate together. At this time, the first serrations 703 on the outside of the rotating plate 702 and the second serrations 705 in the through holes 704 will come into contact with the foam, thereby physically breaking the foam.

[0034] A grid plate 701 is fixedly installed on the inner side of the lid 2 and above the rotating plate 702. The grid plate 701 has three layers, which are arranged alternately. The pore size of the grid plate 701 is 0.5-1mm, and the grid plate 701 is made of stainless steel wire mesh. Specifically, the three layers of grid plates 701 arranged alternately can prevent foam that leaks from the rotating plate 702 from entering the interior of the lid 2, thus intercepting the foam.

[0035] A connecting frame 8 is threadedly connected to the outer side of the stirring rod 604. A scraper 9 is fixedly installed on the side of the connecting frame 8 away from the stirring rod 604. The scraper 9 is made of PTFE flexible material. Specifically, the outer side of the stirring rod 604 has an internal thread, and the inner side of the connecting frame 8 has an external thread that matches the stirring rod 604. By rotating the connecting frame 8, the scraper 9 can be made to abut against the inner wall of the vessel body 1. When the stirring shaft 603 and the stirring rod 604 rotate, the scraper 9 will also rotate together, thereby scraping off the adhering material on the inner wall of the vessel body 1.

[0036] The auxiliary defoaming mechanism 10 includes an air inlet frame 1001, which is fixedly installed at the bottom of the vessel body 1. Several nozzles 1002 are fixedly installed on the top of the air inlet frame 1001. The nozzles 1002 are evenly distributed around the center of the air inlet frame 1001. An air inlet pipe 1003 is fixedly connected to the bottom of the air inlet frame 1001. Specifically, nitrogen can be added to the air inlet frame 1001 through the air inlet pipe 1003, and a small amount of nitrogen (0.1 to 0.3 bar) can be introduced into the material through the nozzles 1002 to effectively suppress foam generation.

[0037] A spiral pipe 11 is fixedly installed on the outside of the vessel body 1. A steam inlet 12 is fixedly connected to the top of the spiral pipe 11, a steam outlet 13 is fixedly connected to the side of the spiral pipe 11, and a condensate outlet 14 is fixedly connected to the bottom of the spiral pipe 11. Specifically, steam is added from the steam inlet 12 of the spiral pipe 11 to heat the material inside the vessel body 1. When the material is heated, the steam can be discharged from the steam outlet 13, and the condensate generated during the heating process can also be discharged through the condensate outlet 14.

[0038] The working principle and usage process of this utility model are as follows: During the vacuum dehydration process, moisture and volatile substances such as formaldehyde in the resin evaporate rapidly, generating a large amount of foam. At this time, the drive motor 601 drives the rotating rod 602 to rotate, which in turn drives the stirring shaft 603 and the stirring rod 604 to rotate synchronously, causing the material inside the vessel 1 to move. When the stirring shaft 603 rotates, the rotating plate 702 rotates accordingly. The first serration 703 on its outer side and the second serration 705 in the through hole 704 come into contact with the foam and physically break it. In addition, the three layers of staggered grid plates 701 can intercept foam that has not been broken by the rotating plate 702, preventing it from entering the interior of the vessel lid 2.

[0039] Simultaneously, scraper 9 rotates with stirring shaft 603 and stirring rod 604, continuously scraping away the adhering material on the inner wall of vessel 1. Combined with a trace amount of nitrogen gas (0.1–0.3 bar) introduced through nozzle 1002, the rising bubbles further physically break down the foam structure, forming a multi-stage defoaming system. This structure ultimately achieves:

[0040] Resin adhesion ≤1%

[0041] The dehydration efficiency is improved by ≥40%, making it especially suitable for the production of high-viscosity phenolic resins.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A phenolic resin polycondensation reactor, comprising a reactor body (1), characterized in that: The top of the vessel body (1) is fixedly installed with a vessel cover (2), and the top of the vessel cover (2) is fixedly installed with a manhole (3) and a feed pipe (4). The bottom of the vessel body (1) is fixedly installed with a discharge pipe (5). The interior of the vessel body (1) is provided with a stirring mechanism (6) and a foam breaking mechanism (7). The bottom of the vessel body (1) is installed with an auxiliary defoaming mechanism (10).

2. The phenolic resin polycondensation reactor according to claim 1, characterized in that: The stirring mechanism (6) includes a motor (601), which is fixedly installed on the top of the lid (2). The output shaft of the motor (601) is fixedly connected to a rotating rod (602). A stirring shaft (603) is fixedly installed at the bottom of the rotating rod (602), and a stirring rod (604) is fixedly installed on the outside of the stirring shaft (603).

3. The phenolic resin polycondensation reactor according to claim 2, characterized in that: The foam breaking mechanism (7) includes a rotating plate (702), which is fixedly installed on the outside of the stirring shaft (603) and above the stirring rod (604). A plurality of first saw teeth (703) are fixedly installed on the outside of the rotating plate (702). The plurality of first saw teeth (703) are evenly distributed with the center of the rotating plate (702) as the center point. A plurality of through holes (704) are opened inside the rotating plate (702), and a plurality of second saw teeth (705) are fixedly installed inside the through holes (704).

4. The phenolic resin polycondensation reactor according to claim 3, characterized in that: A grid plate (701) is fixedly installed on the inner side of the lid (2) and above the rotating plate (702). The grid plate (701) has three layers, which are arranged in an alternating manner. The aperture of the grid plate (701) is 0.5-1mm, and the grid plate (701) is made of stainless steel wire mesh.

5. The phenolic resin polycondensation reactor according to claim 2, characterized in that: The outer side of the stirring rod (604) is threaded with a connecting frame (8), and a scraper (9) is fixedly installed on the side of the connecting frame (8) away from the stirring rod (604). The scraper (9) is made of PTFE flexible material.

6. The phenolic resin polycondensation reactor according to claim 1, characterized in that: The auxiliary defoaming mechanism (10) includes an air inlet frame (1001), which is fixedly installed at the bottom of the vessel body (1). A plurality of nozzles (1002) are fixedly installed on the top of the air inlet frame (1001), and the plurality of nozzles (1002) are evenly distributed with the center of the air inlet frame (1001) as the center point. An air inlet pipe (1003) is fixedly connected to the bottom of the air inlet frame (1001).

7. The phenolic resin polycondensation reactor according to claim 1, characterized in that: A spiral pipe (11) is fixedly installed on the outside of the vessel body (1). A steam inlet (12) is fixedly connected to the top of the spiral pipe (11), a steam outlet (13) is fixedly connected to the side of the spiral pipe (11), and a condensate outlet (14) is fixedly connected to the bottom of the spiral pipe (11).

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