Reaction kettle for calcium glycinate chelation reaction

Abstract

The utility model discloses a reaction kettle for a calcium glycinate chelation reaction, and relates to the field of chemical production equipment, and the reaction kettle comprises a cylindrical kettle body, a built-in heating assembly and a stirring assembly. Wherein three independent temperature control units, namely an upper jacket, a middle jacket and a lower jacket, are axially distributed on the outer wall of the kettle body, each jacket is provided with an independent medium circulating pipeline and an independent temperature controller, and differential temperature adjustment can be carried out on different height areas of the kettle body according to the reaction process; periodic wave-shaped protrusion structures are evenly distributed on the inner surface of the kettle body in the circumferential direction, the protrusions are composed of continuous sine curved surfaces, and the mass transfer efficiency of the near wall face is enhanced through the disturbance effect of a fluid boundary layer. According to the reaction kettle, a heating element is directly integrated in the kettle body to eliminate external thermal resistance, or boundary layer disturbance is enhanced through flow field optimization design, so that the reaction temperature can be accurately controlled, crystal generation can be inhibited, the chelating efficiency of calcium glycinate and the product uniformity can be remarkably improved, and meanwhile, the energy consumption and the maintenance cost are reduced.

Description

Technical Field

[0001] This application relates to the field of chemical production equipment, and in particular to a reaction vessel for a calcium glycine chelation reaction. Background Technology

[0002] In the industrial production of glycine calcium chelation reaction, temperature control and mixing efficiency of the reactor are core factors affecting product quality. Currently widely used traditional reactors mainly consist of a flat-walled vessel, an external jacketed heating system, and a radial flow agitator. Their working principle relies on the heat transfer medium circulating within the jacket through the vessel wall to the material, while mixing is achieved through the mechanical rotation of the agitator blades. However, this design has significant limitations in practical applications: firstly, heat must penetrate the multi-layered thermal resistance structure of the jacket cavity and vessel wall, resulting in a sluggish temperature response. Especially in the initial stage of the reaction when rapid heating is required, the uneven axial temperature distribution within the vessel becomes prominent, and the temperature difference between the upper and lower layers directly affects the synchronicity of the reaction process. Secondly, the radial flow agitator struggles to effectively break down the solid-liquid interface during high-viscosity reactions, leading to localized enrichment of calcium ions and precipitation. Simultaneously, the flat-walled structure easily results in excessively low near-wall flow velocities, failing to suppress the rapid accumulation of crystals on the vessel wall.

[0003] Existing improvement schemes attempt to optimize temperature control through external electric heating or partitioned jacketing, but their design logic is still limited by the inherent defects of external heat conduction. The physical isolation between the external heating element and the reaction system leads to significant heat loss and makes dynamic temperature regulation difficult. For example, when dealing with exothermic fluctuations in the reaction, the hysteresis response of the external heating system often causes localized temperature runaway, exacerbating side reactions. Furthermore, traditional stirring structures often rely on increasing the rotation speed to improve mixing efficiency, but high rotation speeds not only increase energy consumption but also damage the stability of the chelate molecular structure due to excessive shear force. The flat-walled design of the reactor further exacerbates the crystal adhesion problem, and frequent shutdowns for cleaning severely restrict continuous production.

[0004] Against this backdrop, there is an urgent need for a new type of reactor technology that breaks through traditional design paradigms and achieves a reduction in heat conduction path and a substantial improvement in mixing efficiency through structural innovation. Utility Model Content

[0005] The purpose of this application is to overcome at least one deficiency of the existing technology and provide a reaction vessel for the calcium glycinate chelation reaction. This reaction vessel integrates the heating element directly inside the vessel body to eliminate external thermal resistance, or enhances boundary layer disturbance through flow field optimization design. This allows for precise control of the reaction temperature and suppression of crystal formation, significantly improving the chelation efficiency and product uniformity of calcium glycinate, while reducing energy consumption and maintenance costs.

[0006] To achieve the above objectives, this application discloses a reaction vessel for glycine calcium chelation reaction, which includes a cylindrical vessel body, a built-in heating component, and a stirring component.

[0007] The outer wall of the vessel is provided with three independent temperature control units along the axial direction: an upper jacket, a middle jacket, and a lower jacket. Each jacket is equipped with an independent medium circulation pipeline and a temperature controller, which can implement differentiated temperature adjustment for different height areas of the vessel according to the reaction process.

[0008] The inner surface of the vessel is uniformly distributed with periodic wavy protrusions along the circumference. These protrusions are composed of continuous sinusoidal curved surfaces, which enhance the near-wall mass transfer efficiency through the perturbation of the fluid boundary layer.

[0009] The stirring assembly is located inside the vessel and includes multiple layers of irregularly shaped blades distributed along the stirring shaft axis. The upper blades adopt a swept-back oblique blade structure to generate axial mainstream, and the lower blades adopt a straight-blade turbine structure to enhance radial mixing.

[0010] Built-in heating components that avoid irregularly shaped blades are respectively provided in the internal space of the vessel body corresponding to the upper jacket and the middle jacket. The built-in heating components are composed of an annular base and radial guide fins evenly distributed along its circumference.

[0011] The flow guide fins have a streamlined airfoil structure and are internally fitted with resistance heating elements. The flow guide fins are installed at an angle of 15°-30° relative to the horizontal plane, inducing fluid deflection during stirring and improving the turbulence mixing efficiency. Each built-in heating component is fixed to the inner wall of the vessel via an insulating bracket.

[0012] Each temperature control unit and the built-in heating component are connected to the controller, and the temperature control of each temperature control unit and the built-in heating component is achieved by an external controller.

[0013] Furthermore, the inner surface of the vessel is covered with a hydrophobic functional layer, which is formed by plasma spraying of a fluorosilicone resin-based composite material. This layer has a surface roughness Ra ≤ 0.8 μm and a contact angle ≥ 150°, effectively reducing the adhesion tendency of calcium salt crystals. Furthermore, the surface of the heating component's guide fins undergoes micro-arc oxidation treatment to form a ceramic protective layer with a thickness of 20-50 μm and a Mohs hardness ≥ 8, ensuring long-term stability in corrosive media environments.

[0014] Compared with existing technologies, this application improves mass transfer efficiency and increases the mass transfer coefficient through its structural design and functional configuration. The synergistic effect of the wavy protruding structure and multi-layer irregularly shaped blades shortens the reaction time and provides highly consistent temperature conditions for the reaction. The application of a hydrophobic functional layer reduces the adhesion tendency of calcium salt crystals and improves cleaning efficiency. The ceramicized protective layer of the heating components ensures the long-term stability of the equipment in corrosive media environments and extends the service life of the equipment. This reactor is suitable for large-scale industrial production of glycine calcium chelation reaction and has broad market application prospects and significant economic benefits.

[0015] The beneficial effects listed above are not exhaustive of all advantages. Other potential beneficial effects and detailed technical implementation methods will be further disclosed in the embodiments or other descriptive sections of this application. Attached Figure Description

[0016] A better understanding of various aspects of this disclosure will be achieved by reading the following detailed description in conjunction with the accompanying drawings. The positions, dimensions, and extents of the structures shown in the drawings, etc., do not always represent actual positions, dimensions, and extents. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of one embodiment disclosed in this application.

[0018] Figure 2 This is a partial structural diagram of the inner wall of the vessel body disclosed in this application.

[0019] Figure 3 This is a schematic diagram of the structure of the built-in heating component in one embodiment of this application. Detailed Implementation

[0020] The present disclosure will now be described with reference to the accompanying drawings, which illustrate several embodiments of the present disclosure. However, it should be understood that the present disclosure can be presented in many different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure more complete and to fully illustrate the scope of protection of the present disclosure to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments.

[0021] It should be understood that the same reference numerals denote the same elements in all the accompanying drawings. For clarity, the dimensions of certain features may be modified in the drawings.

[0022] It should be understood that the terminology used in this specification is for describing specific embodiments only and is not intended to limit this disclosure. All terms used in this specification (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. For the sake of brevity and / or clarity, techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail; however, where appropriate, such techniques, methods, and apparatus should be considered part of this specification.

[0023] Unless otherwise specified, the singular forms “a,” “the,” and “the” used in this specification include the plural forms. The terms “comprising,” “including,” and “containing” used in this specification indicate the presence of the claimed feature but do not exclude the presence of one or more other features. The term “and / or” used in this specification includes any and all combinations of one or more of the relevant listed items.

[0024] See attached document Figures 1 to 3 This embodiment relates to a reaction vessel for glycine calcium chelation reaction, which achieves a highly efficient and stable glycine calcium chelation reaction process through structural design and functional configuration.

[0025] In this embodiment, the reactor body 1 adopts a cylindrical structure and is made of 316L stainless steel. This material has good corrosion resistance and mechanical strength, ensuring the long-term stable operation of the reactor in complex reaction environments.

[0026] The outer wall of the vessel body 1 is provided with three independent temperature control units along the axial direction: an upper jacket 101, a middle jacket 102, and a lower jacket 103. Each jacket 101, 102, and 103 is fixed to the outer wall of the vessel body 1 by welding, forming an independent chamber structure. Each jacket is equipped with an independent medium circulation pipeline and a temperature controller. This design allows for precise and differentiated temperature adjustment of different height areas of the vessel body 1 according to the reaction process.

[0027] For example, in the initial stage of the glycine calcium chelation reaction, the upper jacket 101 and the middle jacket 102 can provide relatively high temperatures to accelerate the mixing of reactants and the reaction rate; while in the later stage of the reaction, the lower jacket 103 can appropriately reduce the temperature, thereby precisely controlling the reaction rate and avoiding side reactions or product denaturation caused by excessive temperature. Each jacket is connected to an external medium circulation pipeline via flanges. The pipeline integrates solenoid valves and flow sensors to control the medium flow rate and monitor the circulation status.

[0028] Temperature control employs a PID control algorithm, dynamically adjusting heating power and medium flow rate based on signals transmitted from distributed temperature sensors to ensure that the axial temperature gradient is strictly controlled within the set range.

[0029] In this embodiment, the inner surface of the reactor body 1 is provided with a periodically wavy protrusion structure uniformly distributed circumferentially. This protrusion is composed of a continuous sinusoidal surface, with a peak-to-trough spacing of 5-10 mm and a wave height of 3-5 mm, to optimize fluid flow characteristics. The protrusion structure is prefabricated on the inner surface of the reactor body 1 using machining technology, achieving a surface roughness Ra≤0.8μm, ensuring structural precision and smooth reactant flow. This wavy protrusion structure significantly enhances the near-wall mass transfer efficiency by disturbing the fluid boundary layer. This structure can significantly improve the mass transfer coefficient, greatly shorten the reaction time, and increase production efficiency. Furthermore, the inner surface of the reactor body 1 is covered with a hydrophobic functional layer. This functional layer is made of fluorosilicone resin-based composite material, formed by plasma spraying, with a surface roughness Ra≤0.8μm and a contact angle ≥150°. This design effectively reduces the adhesion tendency of calcium salt crystals, significantly reduces scaling on the inner wall of the reactor, improves the cleaning efficiency and service life of the reactor, and reduces maintenance costs.

[0030] The stirring assembly 2 is installed inside the vessel body 1 and includes multiple layers of irregularly shaped blades 202 distributed axially along the stirring shaft 201. The stirring shaft 201 is fixed to the top of the vessel body 1 by a mechanical seal device, ensuring the sealing of the vessel body during stirring and preventing leakage of reactants and intrusion of external impurities. The specific design of the blades is as follows: the upper blades adopt a swept-back oblique blade structure, with an angle of 15°-25° between the blades and the stirring shaft, a blade width of 100-150mm, and a length of 300-400mm. This structure can generate an axial mainstream during stirring, effectively promoting the vertical flow of reactants within the vessel body 1 and ensuring uniform mixing of reactants. The lower blades are designed as a straight-blade turbine structure, with 6 blades, a blade width of 80-120mm, and a diameter of 400-500mm. This structure is used to enhance radial mixing, ensuring that reactants are fully mixed in the horizontal direction and avoiding local concentration differences. The synergistic design of the multi-layered, irregularly shaped impellers enables three-dimensional mixing of the reactants, ensuring uniform distribution of the reactants within the reactor and providing a strong guarantee for efficient reaction. The impeller assembly is fixed to the stirring shaft via a key, and the impellers are reinforced with welding between the impeller and the stirring shaft 201, ensuring structural stability and durability. The mechanical seal device uses a double-end face mechanical seal with silicon carbide as the sealing material, capable of withstanding high temperature and high pressure conditions, ensuring the sealing performance of the equipment during long-term operation.

[0031] It should be understood that the speed adjustment mechanism of the stirring shaft and the specific installation method of the mechanical seal both adopt technologies well known to those skilled in the art. For example, the speed can be steplessly adjusted by a variable frequency motor to adapt to different reaction process requirements.

[0032] Inside the vessel body 1, corresponding to the upper jacket 101 and the middle jacket 102, a built-in heating assembly 3 is installed to avoid the irregularly shaped impeller 202. This heating assembly 3 consists of an annular base 301 and radially distributed guide fins 302 along its circumference. The annular base is made of aluminum alloy with a thickness of 10-15 mm, and its inner diameter matches the inner diameter of the vessel body 1. It is fixed to the inner wall of the vessel body 1 by an insulating bracket. The guide fins 302 have a streamlined airfoil structure, a thickness of 5-8 mm, a length of 200-300 mm, and an installation angle of 15°-30° relative to the horizontal plane. Resistance heating elements, such as nickel-chromium alloy heating wires, are embedded inside the guide fins 302 to ensure uniform and stable heating. The surface of the flow guide fins 302 undergoes micro-arc oxidation treatment, forming a ceramic protective layer with a thickness of 20-50μm and a Mohs hardness ≥8. This treatment improves the long-term stability of the heating element in corrosive media environments and extends the service life of the equipment. The resistance heating element is connected to an external power supply via wires wrapped with polyimide material, ensuring the safety and durability of the connection. The insulating support is made of ceramic material and is fixed to the inner wall of the vessel with bolts, ensuring the stability of the heating element during stirring.

[0033] It should be noted that the electrical connection method of the resistance heating element and the specific process parameters of the micro-arc oxidation treatment are both within the scope of existing technology and can be adjusted according to actual process requirements.

[0034] Temperature control of each jacket 101 to 103 and the built-in heating component 3 is achieved by an external controller 4. This controller 4 uses a PID control algorithm, which dynamically adjusts the heating power and medium flow rate by receiving signals transmitted from distributed temperature sensors, thereby ensuring that the axial temperature gradient is strictly controlled within the set range.

[0035] Distributed temperature sensors are installed inside the reactor body 1, including multiple monitoring points distributed along the axial and radial directions to ensure comprehensive and accurate temperature monitoring. Specifically, the sensors are installed at the top, middle, and bottom of the reactor body 1, as well as near the built-in heating element 3, to monitor temperature changes in different areas in real time, providing a basis for adjustment by the controller 4. With this layout, the controller 4 can adjust the heating strategy based on real-time temperature data, ensuring the stability and consistency of reaction conditions and providing an ideal temperature environment for the glycine calcium chelation reaction.

[0036] In actual operation, when the temperature sensor detects a temperature deviation in a certain area, the controller 4 calculates the required heating power adjustment based on the PID algorithm and corrects the temperature deviation by adjusting the corresponding heating element or medium flow rate. For example, if the temperature in the top area is lower than the set value, the controller 4 increases the heating power of the upper jacket 101; if the temperature in the bottom area rises, it decreases the heating power of the lower jacket 103. This real-time feedback and adjustment mechanism ensures uniform temperature distribution throughout the reactor, providing a reliable temperature guarantee for the efficient execution of the calcium glycinate chelation reaction.

[0037] While exemplary embodiments of this disclosure have been described, those skilled in the art will understand that various changes and modifications can be made to the exemplary embodiments of this disclosure without departing from the spirit and scope thereof. Therefore, all changes and modifications are included within the scope of protection of this disclosure as defined by the claims. This disclosure is defined by the appended claims, and equivalents of those claims are also included.

Claims

1. A reaction vessel for glycine calcium chelation reaction, characterized in that: The reactor includes a cylindrical vessel body, an internal heating element, and a stirring element; The outer wall of the vessel is provided with three independent temperature control units along the axial direction: an upper jacket, a middle jacket, and a lower jacket. Each jacket is equipped with an independent medium circulation pipeline and a temperature controller, which can implement differentiated temperature adjustment for different height areas of the vessel according to the reaction process. The inner surface of the vessel is uniformly distributed with periodic wavy protrusions along the circumference. These protrusions are composed of continuous sinusoidal curved surfaces, which enhance the near-wall mass transfer efficiency through the perturbation of the fluid boundary layer. The stirring assembly is located inside the vessel and includes multiple layers of irregularly shaped blades distributed along the stirring shaft axis. The upper blades adopt a swept-back oblique blade structure to generate axial mainstream, and the lower blades adopt a straight-blade turbine structure to enhance radial mixing. Built-in heating components that avoid irregularly shaped blades are respectively provided in the internal space of the vessel body corresponding to the upper jacket and the middle jacket. The built-in heating components are composed of an annular base and radial guide fins evenly distributed along its circumference. The flow guide fins have a streamlined airfoil structure in cross-section and are internally fitted with resistance heating elements. Each temperature control unit and the built-in heating component are connected to the controller, and the temperature control of each temperature control unit and the built-in heating component is achieved by an external controller.

2. The reaction vessel for the glycine calcium chelation reaction as described in claim 1, characterized in that: The guide fins are installed at an angle of 15°-30° relative to the horizontal plane, which induces the fluid to change direction during stirring.

3. The reaction vessel for the glycine calcium chelation reaction as described in claim 1, characterized in that: Each built-in heating component is fixed to the inner wall of the vessel via an insulating bracket.

4. The reaction vessel for the glycine calcium chelation reaction as described in claim 1, characterized in that: The inner surface of the vessel is covered with a hydrophobic functional layer.

5. The reaction vessel for the glycine calcium chelation reaction as described in claim 1, characterized in that: The surface of the flow guide fins of the heating component is subjected to micro-arc oxidation treatment to form a ceramic protective layer with a thickness of 20-50μm and a Mohs hardness ≥8.

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