A continuous esterification reaction apparatus

Abstract

This utility model relates to the technical field of esterification reaction equipment, specifically a continuous esterification reaction device, comprising: a reaction vessel body with a discharge pipe at its bottom; and a preheating box, positioned above the reaction vessel body, used for mixing and preheating castor oil and polyols in a certain proportion. The preheating box has a feed inlet on its top surface, and a discharge pipe connects the preheating box to the reaction vessel body. The bottom surface of the preheating box is fixedly connected to the top surface of the reaction vessel body via support legs. In this utility model, a hollow rod is rotatably connected inside the reaction vessel body, and the outer wall of the hollow rod inside the reaction vessel body has several circular holes. Atomizing nozzles are installed at positions corresponding to the circular holes on the outer wall of the hollow rod. This allows the catalyst to be directly sprayed into the reaction mixture in a mist form while stirring the mixture inside the reaction vessel body, significantly improving the catalyst dispersion effect, reaction efficiency, and product quality.

Description

Technical Field

[0001] This utility model relates to the technical field of esterification reaction equipment, specifically a continuous esterification reaction device. Background Technology

[0002] Esterification is an important type of reaction in organic chemistry, which refers to the reaction of alcohols with acids (inorganic or organic acids) to produce esters and water under the action of an acidic catalyst. Modified castor oil polyols are polyol compounds obtained by chemically modifying the structure of natural castor oil. They are widely used in polyurethane materials, coatings, adhesives, sealants and other fields. In the production of modified castor oil polyols, continuous esterification reactors are one of the key pieces of equipment.

[0003] Achieving uniform catalyst addition during continuous reaction is a critical issue. Traditional catalyst addition methods (such as direct addition to the reactor or injection through pipelines) cannot ensure sufficient contact between the catalyst and the reactants, which may lead to uneven catalyst dispersion, affecting reaction efficiency and product quality. Utility Model Content

[0004] The purpose of this invention is to provide a continuous esterification reaction apparatus to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A continuous esterification reaction apparatus, comprising:

[0007] The reactor body has a discharge pipe at its bottom;

[0008] A preheating box is installed above the reactor body and is used to mix and preheat castor oil and polyol in a certain proportion. The top surface of the preheating box is provided with a feed inlet. A discharge pipe is connected between the preheating box and the reactor body. The bottom surface of the preheating box is fixedly connected to the top surface of the reactor body through support legs.

[0009] A mixing mechanism is installed inside the reactor body. The mixing mechanism includes a hollow rod that is rotatably connected to the top surface of the reactor body. The outer wall of the reactor body is fixedly connected to a scraping component one, a scraping component two, and several stirring rods two. Several circular holes are opened on the outer wall of the hollow rod. Spraying components are provided at positions corresponding to the circular holes on the outer wall of the hollow rod. The spraying components include atomizing nozzles.

[0010] The catalyst container is installed on the outer wall of the reactor body;

[0011] A diaphragm pump is connected to the inside of the catalyst tank via a first pipe and to the inside of the hollow rod via a second pipe.

[0012] Furthermore, a motor is fixedly connected to the top surface of the preheating box, a rotating shaft is rotatably connected inside the preheating box, and several stirring rods are fixedly connected to the outer wall of the rotating shaft.

[0013] Furthermore, a second motor is installed and fixed on the outer wall of the reactor body. The motor shaft of the second motor and the outer wall of the hollow rod are both fitted with pulleys, and a transmission belt drives between the two pulleys.

[0014] Furthermore, the scraping component two includes two mutually symmetrical C-shaped scrapers, the ends of which are fixedly connected by collars, and both collars are sleeved and fixed to the outer wall of the hollow rod.

[0015] Furthermore, the scraping component two includes a fixed base, which is fixedly connected to the bottom end of the hollow rod, and two arc-shaped scrapers are fixedly connected symmetrically to the bottom surface of the fixed base.

[0016] Furthermore, the spray assembly includes a fixing ring, which is sleeved and fixed to the outer wall of the hollow rod with a circular hole. A protruding post is fixedly connected to the outer wall of the fixing ring at a position corresponding to the circular hole. The atomizing nozzle is fixedly connected to the end of the protruding post. A cavity is formed inside the protruding post. A stopper plate is slidably connected to the inner wall of the cavity. Four springs are fixedly connected to the stopper plate at equal angles to the side wall of the atomizing nozzle.

[0017] Furthermore, the preheating box and the reactor body are both double-layered structures, forming a sandwich layer, and heating wires are installed in the sandwich layer.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] A hollow rod is rotatably connected inside the reactor body, and the hollow rod has several round holes on its outer wall inside the reactor body. Atomizing nozzles are installed at the positions corresponding to the round holes on the outer wall of the hollow rod, so that when the mixture inside the reactor body is stirred, the catalyst can be directly sprayed into the reaction mixture in the form of atomization, which significantly improves the dispersion effect of the catalyst, and improves the reaction efficiency and product quality. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic cross-sectional view of the present invention;

[0022] Figure 3 This is a schematic diagram of the hybrid mechanism structure in this utility model;

[0023] Figure 4 This is an enlarged schematic diagram of region A in this utility model.

[0024] In the diagram: 100, Reactor body; 110, Discharge pipe; 200, Preheating box; 210, Feed inlet; 220, Discharge pipe; 230, Support leg; 240, Motor 1; 250, Rotating shaft; 260, Stirring rod 1; 300, Mixing mechanism; 310, Hollow rod; 311, Round hole; 320, Stirring rod 2; 330, Scraping assembly 1; 331, C-shaped scraper; 332, Collar; 340, Scraping assembly 2; 341, Fixed seat; 342, Arc-shaped scraper; 350, Spray assembly; 351, Fixed ring; 352, Protruding column; 353, Atomizing nozzle; 354, Plug plate; 355, Spring; 400, Catalyst tank; 500, Diaphragm pump; 510, Pipe 1; 520, Pipe 2; 600, Motor 2; 610, Drive belt. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example

[0027] Please see Figure 1-4In this embodiment of the present invention, a continuous esterification reaction apparatus includes a reaction vessel body 100, a preheating box 200, a mixing mechanism 300, a catalyst tank 400, and a diaphragm pump 500. A discharge pipe 110 is provided at the bottom of the reaction vessel body 100, and a valve is provided on the discharge pipe 110. The preheating box 200 is located above the reaction vessel body 100 and is used to mix and preheat castor oil and polyols in a certain proportion. An inlet 210 is provided on the top surface of the preheating box 200. The preheating box 200 and the reaction vessel body 100 are connected... A feed pipe 220 is indirectly connected, and a valve is installed on the feed pipe 220. The bottom surface of the preheating box 200 is fixedly connected to the top surface of the reactor body 100 via a support leg 230. A mixing mechanism 300 is disposed inside the reactor body 100. The mixing mechanism 300 includes a hollow rod 310, which is rotatably connected to the top surface of the reactor body 100. The top end of the hollow rod 310 extends out of the top surface of the reactor body 100. A scraping assembly 1 330 and a scraping assembly 2 34 are fixedly connected to the outer wall of the reactor body 100. 0 and several stirring rods 320, the outer wall of the hollow rod 310 has several round holes 311, and spray components 350 are provided at the positions corresponding to the round holes 311 on the outer wall of the hollow rod 310. The spray components 350 include atomizing nozzles 353. The catalyst tank 400 is installed on the outer wall of the reactor body 100, and a liquid catalyst (such as tetrabutyl titanate) is added inside it. The diaphragm pump 500 is connected to the inside of the catalyst tank 400 through pipe 510, and the diaphragm pump 500 is connected to the hollow rod 310 through pipe 520. The internal parts are connected, and the end of pipe 2 520 rotates relative to the top of hollow rod 310. Motor 2 600 is installed and fixed on the outer wall of reactor body 100. The motor shaft of motor 2 600 and the outer wall of the top of hollow rod 310 are both fitted with pulleys. A transmission belt 610 drives between the two pulleys. The barrel wall of preheating box 200 and the tank wall of reactor body 100 are both double-layered structures, forming a sandwich. An electric heating wire is installed in the sandwich. The electric heating wire is fixed to the inner wall of the sandwich by a fixing device and is surrounded by insulating material.

[0028] Specifically, castor oil and polyol are mixed in a certain proportion and fed into the preheating chamber 200 through inlet 210. The preheating chamber 200 has a double-layered structure, forming a sandwich layer. Heating wires are installed within this sandwich layer, fixed to the inner wall by a fixing device and filled with insulating material. The heating wires are heated by an external power supply and control system, evenly transferring heat to the inner wall of the preheating chamber 200, thereby heating the mixture to the preset reaction temperature. The preheated mixture flows out of the preheating chamber 200 through discharge pipe 220 and enters the reactor body 100. The reactor body 100 also has a double-layered structure, forming a sandwich layer, with heating wires installed within it to maintain the required reaction temperature. Motor 600 is then started. The hollow rod 310 is rotated by the drive belt 610, which causes the stirring rod 320 to stir the mixture inside the reactor body 100. The top of the hollow rod 310 is connected to the catalyst tank 400 through the diaphragm pump 500. The liquid catalyst in the catalyst tank 400 is transported from the catalyst tank 400 to the hollow rod 310 through the diaphragm pump 500 and sprayed out in a mist form through the atomizing nozzle 353, directly contacting the castor oil and polyol mixture. The rotation of the stirring rod 320 makes the atomized catalyst evenly dispersed in the mixture, further improving the reaction efficiency. The scraping component 330 and the scraping component 340 scrape the inner wall of the reactor body 100 to reduce the adhesion of the mixture. After the reaction is completed, the generated material flows out from the discharge pipe 110.

[0029] like Figure 2 As shown, in this embodiment, a motor 240 is fixedly connected to the top surface of the preheating box 200, a rotating shaft 250 is rotatably connected inside the preheating box 200, and a plurality of stirring rods 260 are fixedly connected to the outer wall of the rotating shaft 250.

[0030] In this embodiment, by starting the motor 240 during the preheating stage, the stirring rod 260 stirs the castor oil and polyol, ensuring that the two raw materials are fully mixed during the preheating stage, thereby improving the efficiency of the subsequent reaction.

[0031] like Figure 2-3 As shown, in this embodiment, the scraping component 2 340 includes two mutually symmetrical C-shaped scrapers 331. The ends of the two C-shaped scrapers 331 are fixedly connected by collars 332. Both collars 332 are sleeved and fixed to the outer wall of the hollow rod 310. The scraping component 2 340 includes a fixing seat 341. The fixing seat 341 is fixedly connected to the bottom end of the hollow rod 310. Two arc-shaped scrapers 342 are symmetrically fixedly connected to the bottom surface of the fixing seat 341.

[0032] In practice, the two C-shaped scrapers 331 form a rectangle, framing several stirring rods 320 in the middle. When the hollow rod 310 rotates, the C-shaped scrapers 331 scrape the vertical area of ​​the inner wall of the reactor body 100, reducing the adhesion of the mixture to the tank wall. The arc of the arc-shaped scraper 342 is the same as the inner bottom surface of the reactor body 100, so that when the hollow rod 310 rotates, the C-shaped scrapers 331 and the arc-shaped scrapers 342 can roughly scrape the entire inner wall of the reactor body 100, increasing the scraping area.

[0033] like Figure 3-4 As shown, in this embodiment, the spray assembly 350 includes a fixing ring 351, which is sleeved and fixed to the outer wall of the hollow rod 310 with a circular hole 311. A protrusion 352 is fixedly connected to the outer wall of the fixing ring 351 at a position corresponding to the circular hole 311. The atomizing nozzle 353 is fixedly connected to the end of the protrusion 352. A cavity is formed inside the protrusion 352. A stopper plate 354 is slidably connected to the inner wall of the cavity. Four springs 355 are fixedly connected to the stopper plate 354 at equal angles toward the side wall of the atomizing nozzle 353. The other end of the springs 355 abuts against the inner wall of the cavity.

[0034] In specific implementation, the protruding post 352 and the fixing ring 351 are provided with holes corresponding to the round hole 311. Under the elastic force of the spring 355, the plug plate 354 will default to stick to the inner wall of the cavity near the fixing ring 351, so that the hole communicating with the round hole 311 is blocked, so that when no catalyst is added, the mixture inside the reactor body 100 will not flow back into the hollow rod 310. When the catalyst is added, the catalyst is transported from the catalyst tank 400 to the hollow rod 310 through the diaphragm pump 500, forming pressure on the plug plate 354 at the round hole 311, causing the spring 355 to contract, so that the catalyst is sprayed into the mixture in a spray form through the atomizing nozzle 353.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0036] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A continuous esterification reaction apparatus characterized by comprising: include: The reactor body (100) has a discharge pipe (110) at its bottom. A preheating box (200) is set above the reactor body (100) and is used to mix and preheat castor oil and polyol in a certain proportion. The top surface of the preheating box (200) is provided with a feed inlet (210). A discharge pipe (220) is connected between the preheating box (200) and the reactor body (100). The bottom surface of the preheating box (200) is fixedly connected to the top surface of the reactor body (100) through a support leg (230). A mixing mechanism (300) is installed inside the reactor body (100). The mixing mechanism (300) includes a hollow rod (310), which is rotatably connected to the top surface of the reactor body (100). The outer wall of the reactor body (100) is fixedly connected to a scraping component 1 (330), a scraping component 2 (340), and several stirring rods 2 (320). Several round holes (311) are opened on the outer wall of the hollow rod (310). A spraying component (350) is provided at the position corresponding to the round holes (311) on the outer wall of the hollow rod (310). The spraying component (350) includes an atomizing nozzle (353). The catalyst tank (400) is installed on the outer wall of the reactor body (100); The diaphragm pump (500) is connected to the inside of the catalyst tank (400) through pipe one (510), and the diaphragm pump (500) is connected to the inside of the hollow rod (310) through pipe two (520).

2. The continuous esterification reaction apparatus according to claim 1, wherein A motor (240) is fixedly connected to the top surface of the preheating box (200), and a rotating shaft (250) is rotatably connected inside the preheating box (200). Several stirring rods (260) are fixedly connected to the outer wall of the rotating shaft (250).

3. The continuous esterification reaction apparatus according to claim 1, wherein The outer wall of the reactor body (100) is fixed with a second motor (600). The motor shaft of the second motor (600) and the outer wall of the hollow rod (310) are both fitted with pulleys, and a transmission belt (610) drives the two pulleys.

4. The continuous esterification reaction apparatus according to claim 1, characterized in that, The scraping component 2 (340) includes two mutually symmetrical C-shaped scrapers (331), the ends of which are fixedly connected by collars (332), and both collars (332) are sleeved and fixed to the outer wall of the hollow rod (310).

5. The continuous esterification reaction apparatus according to claim 1, wherein The scraping component 2 (340) includes a fixed seat (341), which is fixedly connected to the bottom end of the hollow rod (310), and two arc-shaped scrapers (342) are fixedly connected to each other symmetrically on the bottom surface of the fixed seat (341).

6. The continuous esterification reaction apparatus according to claim 1, wherein The spray assembly (350) includes a retaining ring (351), which is sleeved and fixed on the outer wall of the hollow rod (310) with a round hole (311). A protrusion (352) is fixedly connected to the outer wall of the retaining ring (351) at a position corresponding to the round hole (311). The atomizing nozzle (353) is fixedly connected to the end of the protrusion (352). A cavity is opened inside the protrusion (352). A stopper plate (354) is slidably connected to the inner wall of the cavity. Four springs (355) are fixedly connected to the side wall of the stopper plate (354) at equal angles toward the side wall of the atomizing nozzle (353).

7. The continuous esterification reaction apparatus according to claim 1 or 3, wherein The walls of the preheating box (200) and the reactor body (100) are both double-layered, forming a sandwich layer, in which heating wires are installed.

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