High-pressure reaction kettle for efficiently synthesizing sodium pyrrolidone carboxylate

Abstract

The high-pressure reaction kettle comprises a kettle body, a stirring device is arranged in the kettle body, the stirring device comprises a stirring shaft driven by a motor outside the kettle body, an inner spiral blade and a plurality of connecting rods are arranged on the stirring shaft, an outer spiral blade is arranged between one ends of the adjacent connecting rods, and the outer spiral blade is arranged between the other ends of the adjacent connecting rods. The spiral directions of the outer spiral blade and the inner spiral blade are opposite, the outer edge of the outer spiral blade is provided with a flexible cleaning piece, and the other end of the connecting rod is provided with a stirring paddle; a plurality of ultrasonic vibration plates which are distributed in a vertically staggered manner are arranged on the inner wall of the kettle body, an ultrasonic generator is arranged outside the kettle body, and the ultrasonic vibration plates are controlled by the ultrasonic generator. The reaction kettle disclosed by the utility model has the characteristics of improving the mixing effect, the reaction synthesis efficiency and the discharging speed.

Description

Technical Field

[0001] This utility model relates to a reaction vessel, and more particularly to a high-pressure reaction vessel for the efficient synthesis of sodium pyrrolidone carboxylate. Background Technology

[0002] The synthesis of sodium pyrrolidone carboxylate involves two methods: the monosodium glutamate (MSG) pyrolysis cyclization method and the pyrrolidone carboxylate neutralization method. The MSG pyrolysis cyclization method primarily uses MSG as the main raw material. The process involves adding MSG to a reactor, along with catalysts and other auxiliaries, and heating to 120-180°C for 1-6 hours to remove the water of crystallization. After dehydration, the temperature is further increased to 190-250°C and held for 2-8 hours to promote intramolecular dehydration of MSG to form sodium pyrrolidone carboxylate. The pyrrolidone carboxylate neutralization method uses pyrrolidone as a raw material. In a reactor, pyrrolidone undergoes cyclization or carboxymethyl dehydration to generate pyrrolidone carboxylate. This pyrrolidone carboxylate is then mixed with sodium carbonate or sodium hydroxide in the reactor to produce sodium pyrrolidone carboxylate.

[0003] The synthesis of sodium pyrrolidone carboxylate requires high temperature and high pressure conditions; therefore, the structural design and performance of the reactor have a significant impact on reaction efficiency and product quality. The reactor must possess good sealing properties and mechanical strength. During the synthesis of sodium pyrrolidone carboxylate, viscous monosodium glutamate pyrolysis products are generated, resulting in high material viscosity and insufficient, uneven mixing. Furthermore, sodium pyrrolidone carboxylate crystals precipitate and easily adhere to the reactor wall, affecting the reaction or clogging the outlet, thus hindering product output. Currently, simple stirring devices provide poor mixing in the synthesis of sodium pyrrolidone carboxylate and are difficult to clean from the reactor wall, impacting the efficient reaction and product output of sodium pyrrolidone carboxylate. Utility Model Content

[0004] The purpose of this invention is to provide a high-pressure reactor for the efficient synthesis of sodium pyrrolidone carboxylate. This invention features improved mixing, increased reaction efficiency, and faster discharge rate.

[0005] The technical solution of this utility model is as follows: A high-pressure reactor for the efficient synthesis of sodium pyrrolidone carboxylate includes a reactor body, an internal stirring device, and a stirring shaft driven by an external motor. The stirring shaft is equipped with an inner helical blade and several connecting rods. An outer helical blade is provided between one end of an adjacent connecting rod. The helical directions of the outer and inner helical blades are opposite. A flexible cleaning element is provided along the outer edge of the outer helical blade. A stirring blade is provided at the other end of the connecting rod. The inner wall of the reactor body is provided with several ultrasonic vibration plates that are staggered vertically. An ultrasonic generator is provided on the outside of the reactor body, and the ultrasonic vibration plates are controlled by the ultrasonic generator.

[0006] In the aforementioned high-pressure reactor for the efficient synthesis of sodium pyrrolidone carboxylate, the distance between the outer helical blade and the inner wall of the reactor is smaller than the distance between the stirring blade and the inner wall of the reactor, and the distance between the stirring blade and the inner wall of the reactor is smaller than the distance between the inner helical blade and the inner wall of the reactor.

[0007] In the aforementioned high-pressure reactor for the efficient synthesis of sodium pyrrolidone carboxylate, the lower end of the stirring shaft is provided with anchor blades, the side of which matches the inner side wall of the reactor, and the bottom of which matches the bottom wall of the reactor.

[0008] In the aforementioned high-pressure reactor for the efficient synthesis of sodium pyrrolidone carboxylate, the inner wall of the reactor body is provided with a ceramic coating.

[0009] In the aforementioned high-pressure reactor for the efficient synthesis of sodium pyrrolidone carboxylate, the flexible cleaning component is a silicone scraper or a brush.

[0010] In the aforementioned high-pressure reactor for the efficient synthesis of sodium pyrrolidone carboxylate, a jacket is detachably connected to the outside of the reactor body. A spiral coil is provided at the bottom of the inner side of the jacket, and a guide plate spirally surrounds the outer wall of the reactor body on the inner side of the jacket.

[0011] In the aforementioned high-pressure reactor for the efficient synthesis of sodium pyrrolidone carboxylate, the distance between the outer diameter of the guide plate and the inner diameter of the jacket is 1–5 mm.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] This invention employs inner and outer spiral blades with opposite spiral directions, allowing the material flow within the reactor to permeate and shear each other, achieving rapid mixing. The inner spiral blades also work in conjunction with the stirring shaft to propel the material axially to the discharge port, accelerating discharge and preventing material accumulation and reducing blockage. The connecting rod is also equipped with stirring blades, which further interfere with and agitate the radially moving material flow, forming complex vortex motion, reducing mixing dead zones, and improving the degree of material mixing.

[0014] A flexible cleaning element is provided on the outer edge of the outer spiral blade to remove the sediment adhering to the inner wall of the reactor, preventing the material from clumping on the inner wall of the reactor and affecting heat transfer, reaction and discharge.

[0015] This invention also includes an ultrasonic vibration plate on the inner wall of the reactor, which not only promotes material dispersion and increases the contact area between materials, thus improving the synthesis efficiency of sodium pyrrolidone carboxylate, but also creates a cavitation effect, providing high temperature and high pressure for the synthesis of sodium pyrrolidone carboxylate, thereby saving external additional heating energy.

[0016] Therefore, this invention has the characteristics of improving mixing effect, increasing reaction synthesis efficiency and discharge speed. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] The labels in the attached diagram are as follows: 1. Vessel body; 11. Ceramic coating; 12. Jacket; 13. Coil; 14. Baffle plate; 2. Stirring device; 21. Motor; 22. Stirring shaft; 23. Inner helical blade; 24. Connecting rod; 25. Outer helical blade; 26. Flexible cleaning component; 27. Stirring blade; 28. Anchor blade; 3. Ultrasonic vibrating plate; 31. Ultrasonic generator. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0020] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, a hinged connection, a rotating connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] Example:

[0022] like Figure 1 As shown, a high-pressure reactor for the efficient synthesis of sodium pyrrolidone carboxylate includes a reactor body 1. Inside the reactor body 1 is a stirring device 2, which includes a stirring shaft 22 driven by an external motor 21. The stirring shaft 22 has inner spiral blades 23 and several connecting rods 24. An outer spiral blade 25 is located between one end of adjacent connecting rods 24. The spiral directions of the outer spiral blades 25 and the inner spiral blades 23 are opposite. A flexible cleaning element 26, which is a silicone scraper or a brush, is located along the outer edge of the outer spiral blades 25. The other end of the connecting rods 24 has a stirring blade 27. The inner wall of the reactor body 1 has several staggered ultrasonic vibration plates 3, each with multiple vibration points. An ultrasonic generator 31 is located outside the reactor body 1. The ultrasonic vibration plates 3, controlled by the ultrasonic generator 31, transmit vibration energy to the materials inside the reactor.

[0023] The stirring device 2 of this utility model adopts inner spiral blades 23 and outer spiral blades 25 with opposite spiral directions. The outer spiral blades 25 push the outer material towards the center, while the inner spiral blades 23 disperse the central material to the outside, so that the material flow in the reactor can penetrate and shear each other in the container to achieve rapid mixing. In addition, the inner spiral blades 23 can also work with the stirring shaft 22 to push the material along the axial direction to the discharge port to accelerate the discharge, prevent material accumulation, and reduce material blockage. The connecting rod 24 is also equipped with stirring blades 27, which further interfere with and agitate the radially moving material flow to form a complex vortex motion, reduce mixing dead angles, and improve the mixing degree of the material.

[0024] A flexible cleaning element 26 is provided on the outer edge of the outer spiral blade 25. Under the rotation of the outer spiral blade 25, the flexible cleaning element 26 cleans the precipitate adhering to the inner wall of the vessel body 1, preventing the material from clumping on the inner wall of the vessel body 1 and affecting heat transfer, reaction and discharge.

[0025] This invention also provides an ultrasonic vibration plate 3 on the inner wall of the vessel body 1. The ultrasonic vibration plate 3 surrounds the outside of the stirring device 2. By using ultrasound, not only is the catalyst dispersed in sodium glutamate or the base in pyrrolidone carboxylic acid, increasing the contact area between different materials and improving the synthesis efficiency of sodium pyrrolidone carboxylic acid, but it also forms a cavitation effect, providing high temperature and high pressure for the synthesis of sodium pyrrolidone carboxylic acid, thereby saving external additional heating energy.

[0026] The distance between the outer helical blade 25 and the inner wall of the vessel body 1 is smaller than the distance between the stirring blade 27 and the inner wall of the vessel body 1, and the distance between the stirring blade 27 and the inner wall of the vessel body 1 is smaller than the distance between the inner helical blade 23 and the inner wall of the vessel body 1. The different distances between the outer helical blade 25, the stirring blade 27, and the inner helical blade 23 and the inner wall of the vessel body 1 allow for stirring of the material at different locations, enhancing turbulence, expanding the mixing range, and improving mixing uniformity.

[0027] The lower end of the stirring shaft 22 is provided with anchor blades 28. The side of the anchor blades 28 matches the inner sidewall of the vessel body 1, and the bottom of the anchor blades 28 matches the inner bottom wall of the vessel body 1. The anchor blades 28 are used to perform horizontal circumferential flow, reducing dead zones in the stirring, ensuring uniform dispersion of materials, and further removing precipitates adhering to the inner bottom wall of the vessel body 1.

[0028] The inner wall of the reactor body 1 is provided with a ceramic coating 11. The ceramic coating 11 is smooth, heat-resistant, and wear-resistant, making it difficult for the synthesized sodium pyrrolidone carboxylate to adhere.

[0029] The vessel body 1 is detachably connected to a jacket 12. The bottom of the jacket 12 is provided with a spiral coil 13, and the inner side of the jacket 12 is provided with a guide plate 14 spirally surrounding the outer wall of the vessel body 1. The jacket 12 and the coil 13 are used for dual heating and heat conduction, increasing the heat transfer surface and achieving rapid heating and cooling. The guide plate 14 increases the turbulence of the heat exchange medium, improves the heat transfer coefficient, and enhances the heat transfer effect of the jacket 12 on the vessel body 1.

[0030] The distance between the outer diameter of the guide plate 14 and the inner diameter of the jacket 12 is 1 to 5 mm. The smaller the distance, the better the heat transfer effect.

[0031] The parts of this utility model not described in detail are existing technologies and therefore will not be specifically described here.

Claims

1. A high-pressure reactor for the efficient synthesis of sodium pyrrolidone carboxylate, characterized in that: The vessel includes a vessel body (1), and a stirring device (2) is provided inside the vessel body (1). The stirring device (2) includes a stirring shaft (22) driven by an external motor (21) of the vessel body (1). The stirring shaft (22) is provided with an inner spiral blade (23) and several connecting rods (24). An outer spiral blade (25) is provided between one end of an adjacent connecting rod (24). The spiral directions of the outer spiral blade (25) and the inner spiral blade (23) are opposite. A flexible cleaning element (26) is provided on the outer edge of the outer spiral blade (25). A stirring blade (27) is provided at the other end of the connecting rod (24). The inner wall of the vessel body (1) is provided with several ultrasonic vibration plates (3) that are staggered vertically. An ultrasonic generator (31) is provided on the outside of the vessel body (1). The ultrasonic vibration plates (3) are controlled by the ultrasonic generator (31).

2. The high-pressure reactor for the high-efficiency synthesis of sodium pyrrolidone carboxylate according to claim 1, characterized in that: The distance between the outer spiral blade (25) and the inner wall of the vessel body (1) is less than the distance between the stirring blade (27) and the inner wall of the vessel body (1), and the distance between the stirring blade (27) and the inner wall of the vessel body (1) is less than the distance between the inner spiral blade (23) and the inner wall of the vessel body (1).

3. The high-pressure reactor for the high-efficiency synthesis of sodium pyrrolidone carboxylate according to claim 1, characterized in that: The lower end of the stirring shaft (22) is provided with an anchor blade (28), the side of the anchor blade (28) matches the inner side wall of the vessel body (1), and the bottom of the anchor blade (28) matches the inner bottom wall of the vessel body (1).

4. The high-pressure reactor for the high-efficiency synthesis of sodium pyrrolidone carboxylate according to claim 1, characterized in that: The inner wall of the vessel body (1) is provided with a ceramic coating (11).

5. The high pressure reactor as claimed in claim 1, wherein: The flexible cleaning component (26) is a silicone scraper or a brush.

6. The high pressure reactor as claimed in claim 1, wherein: The vessel body (1) is detachably connected to a jacket (12). The bottom of the jacket (12) is provided with a spiral coil (13), and the inner side of the jacket (12) is provided with a guide plate (14) spirally surrounding the outer wall of the vessel body (1).

7. The high-pressure reactor for the high-efficiency synthesis of sodium pyrrolidone carboxylate according to claim 6, characterized in that: The distance between the outer diameter of the guide plate (14) and the inner diameter of the jacket (12) is 1 to 5 mm.

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