Novel solid-liquid alkali fusion synthesis kettle

Abstract

The invention provides a novel solid-liquid alkali fusion synthesis kettle which comprises a kettle body, a motor, a stirring shaft and stirring blades, and further comprises at least one guide cutting plate and a plurality of tangential baffles, the tangential baffles are obliquely arranged on the inner wall of the kettle body at intervals; the guide cutting plate is fixed on the stirring shaft and faces the inner wall of the kettle body, and a local reaction area is formed between the guide cutting plate and the tangential baffle when the guide cutting plate rotates along with the stirring shaft. The reaction kettle has an efficient local reaction area, materials are continuously centrifugally thrown out, cut and mixed, the limitation of traditional frame type stirring is broken through, the contact area of solid-phase, liquid-phase and gas-phase materials is increased, and the reaction speed and the mixing uniformity are improved; the method is suitable for exothermic reaction between bulky solids such as sylvite and gas, has obvious advantages in indigo blue production, can be popularized to other similar solid-liquid-gas multiphase reaction processes, and has wide application prospects.

Description

Technical Field

[0001] This invention belongs to the field of chemical reaction equipment technology, specifically relating to a novel solid-liquid alkali fusion synthesis reactor for indigo production. Background Technology

[0002] Indigo is an important dye intermediate, and its production involves a solid-liquid alkali-fusion chemical reaction. Traditional indigo synthesis reactors mostly adopt a frame-type stirring structure, which is small in size and suffers from problems such as low stirring efficiency, easy deposition of materials at the bottom forming a reaction blind zone, and insufficient mixing of solid, liquid, and gas phases. This results in long reaction cycles, low efficiency, and difficulty in adapting to the needs of large-scale, continuous production.

[0003] Therefore, developing a novel synthesis vessel that can achieve efficient mixing, avoid bottom sedimentation, and improve reaction efficiency is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a novel solid-liquid alkali fusion synthesis reactor that enables uniform mixing of internal raw materials, complete reaction, no bottom blind zone, and is suitable for large-scale production.

[0005] The specific plan is as follows: A novel solid-liquid alkali fusion reactor includes a reactor body, a motor, a stirring shaft, and stirring blades. The surface of the reactor body has an inlet, an outlet, and a gas inlet. The motor is installed on the top of the reactor body, and the stirring shaft is axially fixed by a reducer. The stirring shaft is located inside the reactor body and the stirring blades are installed in a spiral shape. The reactor also includes at least one guide cutting plate and several tangential baffles. The tangential baffles are obliquely and spaced apart on the inner wall of the reactor body. The guide cutting plate is fixed on the stirring shaft and faces the inner wall of the reactor body. When the guide cutting plate rotates with the stirring shaft, it forms a local reaction zone with the tangential baffles.

[0006] This invention forms a highly efficient local reaction zone through the synergistic effect of stirring blades, guide cutting plates, and tangential baffles. The material is continuously centrifuged, cut, and mixed, breaking the limitations of traditional frame stirring. This increases the contact area of ​​solid, liquid, and gaseous materials, improves the reaction rate, and enhances the mixing uniformity.

[0007] Furthermore, a bushing is uniformly fixed on the stirring shaft; the stirring blade is fixed radially to the surface of the bushing according to the Archimedean spiral.

[0008] The stirring blade layout based on the Archimedes' spiral principle in this invention not only ensures uniform distribution of materials in both the radial and axial directions but also facilitates countercurrent contact with the gas introduced from the bottom, thus enhancing the mass transfer process. Simultaneously, the temperature control design of the outer jacket ensures the timely removal or supply of reaction heat, providing a stable temperature environment for the reaction.

[0009] Furthermore, the guide cutting plate is right-angled and fixed to the lower end of the stirring shaft.

[0010] Furthermore, irregularly shaped stirring blades are fixed to the bottom of the stirring shaft in a staggered manner; the bottom surface of the irregularly shaped stirring blades is adapted to the bottom surface of the vessel body.

[0011] The irregularly shaped stirring blades at the bottom of the stirring shaft are specially designed for the shape of the bottom of the vessel, which can effectively tumble and stir the bottom material. Combined with the support of a highly wear-resistant hard alloy bottom bearing, it completely solves the global problem of easy material deposition and incomplete reaction at the bottom of traditional stirring equipment, ensuring the integrity and consistency of the reaction process.

[0012] Furthermore, the vessel body is provided with a jacket; the jacket has an oil inlet and an oil outlet.

[0013] The present invention has a jacket on the outside of the vessel body, and the jacket has an oil inlet and an oil outlet for introducing heat transfer oil and other media for temperature control.

[0014] Furthermore, a shaft hole is opened at the center of the bottom end of the stirring shaft, and a hard alloy sliding shaft is provided in conjunction with it. A bearing seat that is compatible with the hard alloy sliding shaft is provided at the corresponding position on the bottom side of the vessel body.

[0015] The bottom support in this invention is made of a highly wear-resistant hard alloy material, which greatly improves the wear resistance and service life of the bottom bearing, reduces equipment downtime caused by bottom wear, and ensures the continuity and stability of production. It is particularly suitable for large-scale, continuous industrial production.

[0016] Furthermore, two sets of stirring blades are symmetrically fixed on both sides of the bushing about the center point of the bushing. Each set of stirring blades is fixed according to the Archimedean spiral at 30°, 60°, 90° and 120°, and the length increases progressively. The end of the stirring blade is provided with an end guide cutting plate along its tangential direction.

[0017] Furthermore, the surface of the end guide cutting plate facing the direction of rotation of the stirring shaft is curved.

[0018] Furthermore, the vessel body is composed of an upper vessel body and a lower vessel body, and a mechanical seal is provided at the connection point.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. Through the synergistic effect of stirring blades, guide cutting plates and tangential baffles, a highly efficient local reaction zone is formed. The material is continuously centrifuged, cut and mixed, breaking the limitations of traditional frame stirring, increasing the contact area of ​​solid, liquid and gas three-phase materials, improving the reaction rate and mixing uniformity. 2. This invention is particularly suitable for handling exothermic reactions between bulky solids such as potassium salts and gases, and has significant advantages in indigo production. It can also be extended to other similar solid-liquid-gas multiphase reaction processes, and has broad application prospects. 3. By using irregularly shaped stirring blades that fit snugly against the bottom of the vessel, the problem of material accumulation and incomplete reaction at the bottom of traditional stirring equipment is solved, ensuring the integrity and consistency of the reaction process. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is an enlarged view of the bottom of the stirring shaft in this invention; Figure 4 This is a schematic diagram of the structure of the stirring blade in this invention.

[0021] In the diagram: 1. Bearing housing; 2. Jacket; 3. Irregularly shaped stirring blades; 4. Guide cutting plate; 5. Tangential baffle; 6. Stirring blades; 7. Vessel body; 8. Feed inlet; 9. Mechanical seal; 10. Reducer; 11. Motor; 12. Stirring shaft; 13. Long shaft sleeve; 14. Gas inlet support; 15. Discharge port; 16. Oil inlet; 17. Oil outlet; 18. Hard alloy sliding shaft; 19. End guide cutting plate. Detailed Implementation

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The specific implementation methods of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Example

[0023] like Figure 1 , 2 As shown in Figures 1 and 3, this embodiment is a novel solid-liquid alkali fusion synthesis reactor, which includes a reactor body 7, a motor 11, a stirring shaft 12, and stirring blades 6.

[0024] The vessel body 7 is composed of an upper vessel body and a lower vessel body connected vertically, and the connection is sealed by a mechanical seal 9 to improve the sealing performance. The vessel body 7 is provided with a jacket 2 on the outside. The jacket 2 has an oil inlet 16 and an oil outlet 17. The surface of the vessel body 7 has a feed inlet 8, a discharge outlet 15 and a gas inlet 14 respectively. A motor 11 is installed on the top of the vessel body 7, and a stirring shaft 12 is axially fixed by a reducer 10. The stirring shaft 12 is located inside the vessel body 7 and the stirring blades 6 are installed in a spiral shape.

[0025] The vessel body 7 is also provided with a guide cutting plate 4 and several tangential baffles 5; the tangential baffles 5 are obliquely and spaced apart on the inner wall of the vessel body 7; the guide cutting plate 4 is right-angled, fixed to the lower end of the stirring shaft 12, and facing the inner wall of the vessel body 7. When the guide cutting plate 4 rotates with the stirring shaft, a local reaction zone is formed between it and the tangential baffles 5.

[0026] Long shaft sleeves 13 are evenly fixed on the stirring shaft 12, and irregularly shaped stirring blades 3 are also fixed to the bottom in an alternating manner; stirring blades 6 are fixed radially to the surface of long shaft sleeves 13 according to the Archimedes spiral; the bottom surface of the irregularly shaped stirring blades 3 is adapted to the bottom surface of the vessel body 7.

[0027] Furthermore, the bottom center of the stirring shaft 12 has a shaft hole and is fitted with a hard alloy sliding shaft 18. The bottom of the inner side of the vessel body 7 is provided with a bearing seat 1 that is compatible with the hard alloy sliding shaft 18.

[0028] In this embodiment, during operation, the motor 11 drives the stirring shaft 12 to rotate, and the stirring blade 6 disperses the potassium salt material in the center to the outer periphery based on the Archimedes spiral principle. The material that is thrown out encounters the tangential baffle 5, and at the same time, the rotating guide cutting plate 4 cuts it, forming a strong local reaction zone between the two, realizing the continuous circulation, cutting and reaction of the material, which greatly improves efficiency.

[0029] Meanwhile, the irregularly shaped stirring blades 3 at the bottom of the stirring shaft 12 can effectively turn up the bottom material, prevent sedimentation, eliminate the bottom stirring blind zone, ensure the complete reaction of the material in the entire reaction zone, and improve the stability of the shaft system.

[0030] The reaction gas (such as ammonia and its mixture) is introduced through the gas inlet 14, and the potassium salt material is fully contacted and undergoes an exothermic chemical reaction. The reaction product is finally discharged from the outlet 15. Example

[0031] This embodiment further optimizes the overall structure in Embodiment 1. Two sets of stirring blades 6 are symmetrically fixed on both sides of the long shaft sleeve 13 about the center point of the long shaft sleeve 13. Each set of stirring blades 6 is fixed according to the Archimedean spiral at 30°, 60°, 90° and 120°, and the length increases. An end guide cutting plate 19 is provided at the end of the stirring blade 6 along its tangential direction. The surface of the end guide cutting plate 19 facing the rotation direction of the stirring shaft 12 is an arc surface.

[0032] Innovation Point 1: The intermediate stirring gradually expands in both the height and diameter directions, forming a stretched Archimedean spiral. During operation, three discontinuous Archimedean spirals are formed from bottom to top, undergoing shearing motion at different heights and cross-sections. Ammonia is introduced at the bottom, allowing the mixed gas to undergo a fully exothermic reaction from bottom to top.

[0033] Innovation Point 2: Based on the Archimedes spiral, each layer of blades is designed with an end guide cutting plate 19. When the equipment is working, the blades are redistributed along the tangent to achieve the ideal mixing effect.

[0034] Innovation Point 3: The bottom of the stirring shaft 12 is equipped with a built-in sliding bearing. Due to the high temperature of the stirring exothermic reaction, a hard alloy sleeve is used as a friction pair. The gap of the friction pair is calculated through thermal expansion and thermal stress, thereby improving the stirring strength and stability.

[0035] Innovation Point 4: The irregularly shaped stirring blades 3 are symmetrical, and spring scrapers are designed at different points on the bottom to effectively prevent materials from sticking to the surface of the vessel body 7, achieving an ideal stirring effect.

[0036] Innovation Point 5: The guide cutting plate 4 and the tangential baffle 5 are designed at a shearing angle, which effectively solves the mixing effect at the edge of the cylinder.

[0037] The above embodiments are for illustrative purposes only and are not intended to limit the scope of this invention. Although this invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of this invention do not depart from the spirit and scope of the technical solutions of this invention and should be covered within the scope of the claims of this invention.

Claims

1. A novel solid-liquid alkali fusion synthesis reactor, comprising a reactor body, a motor, a stirring shaft, and stirring blades, wherein the surface of the reactor body has an inlet, an outlet, and a gas inlet, the motor is mounted on the top of the reactor body, and the stirring shaft is axially fixed by a reducer, the stirring shaft is located inside the reactor body, and the stirring blades are installed in a spiral shape, characterized in that... It also includes at least one guide cutting plate and several tangential baffles; the tangential baffles are obliquely and spaced apart on the inner wall of the vessel; the guide cutting plate is fixed on the stirring shaft and faces the inner wall of the vessel, and when the guide cutting plate rotates with the stirring shaft, a local reaction zone is formed between it and the tangential baffles.

2. The novel solid-liquid alkali fusion synthesis reactor according to claim 1, characterized in that, Long shaft sleeves are uniformly fixed on the stirring shaft; the stirring blades are fixed radially to the surface of the long shaft sleeves according to the Archimedean spiral.

3. The novel solid-liquid alkali fusion synthesis reactor according to claim 2, characterized in that, The guide cutting plate is right-angled and fixed to the lower end of the stirring shaft.

4. The novel solid-liquid alkali fusion synthesis reactor according to claim 3, characterized in that, The bottom of the stirring shaft is also fixed with irregularly shaped stirring blades that are staggered from left to right; the bottom surface of the irregularly shaped stirring blades is adapted to the bottom surface of the vessel body.

5. A novel solid-liquid alkali fusion synthesis reactor according to claim 4, characterized in that, The vessel body is provided with a jacket; the jacket has an oil inlet and an oil outlet.

6. A novel solid-liquid alkali fusion synthesis reactor according to claim 5, characterized in that, The bottom center of the stirring shaft has a shaft hole and is fitted with a hard alloy sliding shaft. The bottom of the inner side of the vessel body is provided with a bearing seat that is compatible with the hard alloy sliding shaft.

7. A novel solid-liquid alkali fusion synthesis reactor according to claim 2, characterized in that, Two sets of stirring blades are symmetrically fixed on both sides of the bushing about the center point of the bushing. Each set of stirring blades is fixed according to the Archimedean spiral at 30°, 60°, 90° and 120°, and the length increases progressively. The end of the stirring blade is provided with an end guide cutting plate along its tangential direction.

8. A novel solid-liquid alkali fusion synthesis reactor according to claim 7, characterized in that, The surface of the end guide cutting plate facing the direction of rotation of the stirring shaft is curved.

9. A novel solid-liquid alkali fusion synthesis reactor according to claim 1, characterized in that, The vessel body consists of an upper vessel body and a lower vessel body, and a mechanical seal is provided at the connection point.

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