Reaction kettle for producing guanidine carbonate

Abstract

The utility model relates to the technical field of reaction kettle, specifically disclose a reaction kettle for guanidine carbonate production, including the reaction kettle body, the inside of reaction kettle body is provided with stirring subassembly, stirring subassembly includes the vertical setting in the reaction kettle body of pivot, the servo motor of installation in the kettle lid top end, the output of servo motor passes through the speed reducer and pivot drive connection, the lower stirring shaft of fixed connection in the lower part of pivot, the upper stirring shaft of fixed connection in the upper part of pivot, the conical flow guide tube of coaxial arrangement in the reaction kettle body, produce strong downward flow in the conical flow guide tube through the upper stirring shaft, the lower stirring shaft provides strong dispersion at the bottom, cooperate conical flow guide tube forced the directional macrocycle of material, through the synergistic effect of conical flow guide tube and double -layer stirring shaft, forced formation from top to bottom axial flow and from bottom to top radial flow circulation, completely eliminate the mixed dead angle, greatly promote solid dicyandiamide and liquid ammonium salt initial dispersion efficiency and reaction uniformity.

Description

Technical Field

[0001] This utility model relates to the field of reaction vessel technology, and specifically discloses a reaction vessel for the production of guanidine carbonate. Background Technology

[0002] Guanidine carbonate, as a raw material and analytical reagent in organic synthesis, is used as a pH adjuster, antioxidant, resin stabilizer, and guanidine soap in amino resins. It is also used as an additive in cement slurry agents and surfactants. In synthetic detergents, it is used as a moisture-resistant agent and synergist. In the determination of zinc, cadmium, and manganese weights, it is used as a precipitant and for the separation of magnesium from alkali metals. Particularly in the pharmaceutical field, it is highly effective in neutralizing and separating impurities during production processes. Therefore, the technological development of high-purity guanidine carbonate products, aiming to capture the high-end pharmaceutical market with superior products, is of great significance for improving the economic benefits of enterprises.

[0003] Chinese Patent No. CN222111814U discloses a reactor for producing guanidine carbonate, comprising a reactor body, a discharge pipe connected to the lower end of the reactor body, an electromagnetic valve installed on the outer wall of the discharge pipe, a filter cover installed inside the discharge pipe, a support installed on the upper end of the reactor body, a motor installed on the upper end of the support, a stirring shaft detachably connected to the output end of the motor, the lower end of the stirring shaft penetrating and extending into the interior of the reactor body, a connecting column fixedly connected to the lower end of the stirring shaft, and a scraper installed on the lower end of the connecting column that fits tightly against the upper end of the filter cover. When the reactor body filters and discharges ethanol, it facilitates scraping away the crude guanidine carbonate that has accumulated and blocked the upper end of the filter cover, accelerating the discharge of ethanol and preventing the problem of slow or incomplete ethanol discharge caused by the accumulation and blockage of crude guanidine carbonate on the upper end of the filter cover.

[0004] Although the above-mentioned document can scrape away the crude guanidine carbonate that has accumulated and blocked the top of the filter cover, thus accelerating the discharge of ethanol, the stirring is prone to dead zones, resulting in insufficient mixing, reduced reaction rate and conversion rate, and low heat transfer efficiency. Therefore, a reaction vessel for guanidine carbonate production is needed to solve this problem. Utility Model Content

[0005] This invention proposes a reaction vessel for the production of guanidine carbonate. Through the synergistic effect of a conical guide tube and a double-layer stirring shaft, it forces the formation of an axial flow from top to bottom and a radial flow from bottom to top, eliminating mixing dead zones and improving the initial dispersion efficiency and reaction uniformity of solid dicyandiamide and liquid ammonium salt. The transversely arranged arc-shaped baffles force the heat exchange medium in the jacket to form an S-shaped turbulent flow, significantly improving the jacket heat transfer coefficient and solving the problem of low heat transfer efficiency caused by laminar flow in traditional jackets.

[0006] This utility model is implemented as follows: a reaction vessel for producing guanidine carbonate includes a reaction vessel body, a vessel cover is provided at the top of the reaction vessel body, a feed pipe is provided on the vessel cover and communicates with the reaction vessel body, a discharge pipe with an electromagnetic valve installed on the outer wall is connected to the bottom of the reaction vessel body, and a stirring assembly is provided inside the reaction vessel body.

[0007] The stirring assembly includes a vertically mounted rotating shaft inside the reactor body, a servo motor mounted on the top of the reactor lid, the output end of the servo motor being driven and connected to the rotating shaft via a reducer, a lower stirring shaft fixedly connected to the lower part of the rotating shaft, an upper stirring shaft fixedly connected to the upper part of the rotating shaft, and a conical guide tube coaxially mounted inside the reactor body. The conical guide tube is located around the upper stirring shaft, the upper opening edge of the conical guide tube is fixed to the upper inner wall of the reactor body, and the lower end of the conical guide tube has an open structure and is suspended in the air.

[0008] The outer wall of the reactor body is provided with a jacket, which surrounds the cylindrical part of the reactor body. The inner cavity of the jacket is provided with multiple horizontally arranged and staggered baffles, which have an arc-shaped structure.

[0009] As a preferred embodiment of the reaction vessel for producing guanidine carbonate according to this utility model, the bottom end of the rotating shaft is fixedly connected to a scraper adapted to the bottom end of the inner wall of the reaction vessel body.

[0010] As a preferred embodiment of the reaction vessel for producing guanidine carbonate according to this utility model, the conical guide tube has a structure with a large diameter at the upper end and a small diameter at the lower end.

[0011] As a preferred embodiment of the reaction vessel for producing guanidine carbonate according to this utility model, the lower stirring shaft is a three-bladed swept-back stirring impeller, and the upper stirring shaft is a wide-bladed airfoil axial flow impeller.

[0012] As a preferred embodiment of the reaction vessel for producing guanidine carbonate according to this utility model, the outer wall of the jacket is connected to an inlet pipe located above and an outlet pipe located below.

[0013] In a preferred embodiment of the reaction vessel for producing guanidine carbonate according to this utility model, both the servo motor and the solenoid valve are electrically connected to an external controller.

[0014] The beneficial effects of this utility model are:

[0015] 1. The upper stirring shaft generates a strong downward flow inside the conical guide tube, while the lower stirring shaft provides strong dispersion at the bottom. Together with the conical guide tube, it forces a large directional circulation of materials. Through the synergistic effect of the conical guide tube and the double-layer stirring shaft, it forces the formation of an axial flow from top to bottom and a radial flow from bottom to top, completely eliminating mixing dead zones and significantly improving the initial dispersion efficiency and reaction uniformity of solid dicyandiamide and liquid ammonium salt.

[0016] 2. The heat transfer medium is transported into the jacket, and the heat transfer medium in the jacket is forced into S-shaped turbulence by the transversely arranged bow-shaped baffles, which significantly improves the heat transfer coefficient of the jacket and solves the problem of low heat transfer efficiency caused by laminar flow in traditional jackets. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0018] Figure 1 This is a front sectional view of a reaction vessel for producing guanidine carbonate according to the present invention.

[0019] Figure 2 This is a structural diagram of the conical guide tube of this utility model.

[0020] Figure 3 This is a structural diagram of the jacket of this utility model.

[0021] The markings in the diagram are: 1. Reactor body; 101. Reactor cover; 102. Discharge pipe; 2. Servo motor; 201. Lower stirring shaft; 202. Upper stirring shaft; 203. Scraper; 3. Conical guide tube; 4. Jacket; 401. Baffle plate. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0023] Please see Figure 1-3 A reaction vessel for producing guanidine carbonate includes a reaction vessel body 1, a vessel cover 101 at the top of the reaction vessel body 1, a feed pipe connected to the reaction vessel body 1 on the vessel cover 101, a discharge pipe 102 with a solenoid valve installed on the outer wall at the bottom of the reaction vessel body 1, and a stirring assembly inside the reaction vessel body 1.

[0024] The stirring assembly includes a rotating shaft vertically installed inside the reactor body 1, a servo motor 2 installed at the top of the reactor cover 101, the output end of the servo motor 2 being driven and connected to the rotating shaft via a reducer, a lower stirring shaft 201 fixedly connected to the lower part of the rotating shaft, an upper stirring shaft 202 fixedly connected to the upper part of the rotating shaft, and a conical guide tube 3 coaxially installed inside the reactor body 1. The conical guide tube 3 is located around the upper stirring shaft 202, the upper opening edge of the conical guide tube 3 is fixed to the upper inner wall of the reactor body 1, and the lower end of the conical guide tube 3 has an open structure and is suspended in the air.

[0025] The outer wall of the reactor body 1 is provided with a jacket 4, which surrounds the cylindrical part of the reactor body 1. The inner cavity of the jacket 4 is provided with multiple horizontally arranged and staggered baffles 401, which have an arc-shaped structure.

[0026] In this embodiment: the upper stirring shaft 202 generates a strong downward flow inside the conical guide tube 3, and the lower stirring shaft 201 provides strong dispersion at the bottom. Together with the conical guide tube 3, the material is forced to directionally circulate in a large manner. The downward fluid generated by the upper stirring shaft 202 is forced to flow downward along the inner wall of the conical guide tube 3. After reaching the bottom of the vessel, it is dispersed by the lower stirring shaft 201, forming a high-intensity global circulating flow field that is replenished upward along the vessel wall and then downward through the outside of the conical guide tube 3. This eliminates mixing dead zones. Through the synergistic effect of the conical guide tube 3 and the double-layer stirring shafts (upper stirring shaft 202 and lower stirring shaft 201), a downward axial flow and a downward radial flow circulation are forced to form, completely eliminating mixing dead zones and significantly improving the initial dispersion efficiency and reaction uniformity of solid dicyandiamide and liquid ammonium salt.

[0027] The heat transfer medium is transported into the jacket 4, and the heat transfer medium in the jacket 4 is forced to flow in an S-shape turbulent manner by the transversely arranged bow-shaped baffles 401, which significantly improves the heat transfer coefficient of the jacket 4 and solves the problem of low heat transfer efficiency caused by laminar flow in traditional jacket 4.

[0028] As a technical optimization of this utility model, a scraper 203 adapted to the bottom of the inner wall of the reactor body 1 is fixedly connected to the bottom of the rotating shaft.

[0029] In this embodiment, the material precipitated in the reactor body 1 can be stirred by the scraper 203 at the bottom, so that the material at the bottom is fully mixed.

[0030] As a technical optimization of this utility model, the conical guide tube 3 has a structure with a large diameter at the upper end and a small diameter at the lower end.

[0031] In this embodiment: the conical structure with a large upper diameter and a small lower diameter can guide the high-speed fluid generated by the upper stirring shaft 202 to contract and accelerate downward, enhancing the impact force on the bottom material; at the same time, a low-pressure zone is formed on the outside of the conical guide tube 3, promoting the material to flow back from the outside of the conical guide tube 3 to the top, realizing efficient circulation of the whole vessel.

[0032] As a technical optimization of this utility model, the lower stirring shaft 201 is a three-bladed swept-back stirring impeller, and the upper stirring shaft 202 is a wide-bladed airfoil axial flow impeller.

[0033] In this embodiment: a three-bladed swept-back impeller provides high-intensity radial shear force to quickly break up solid particles, and a wide-bladed airfoil axial flow generates a large-flow, low-shear axial flow, which, together with the conical guide tube 3, forms a directional circulation; the dual-impeller combination reduces power consumption while improving mixing efficiency.

[0034] As a technical optimization of this utility model, the outer wall of the jacket 4 is connected to an inlet pipe located above and an outlet pipe located below.

[0035] In this embodiment, the top-inlet and bottom-outlet flow design ensures that the heat exchange medium (steam) completely fills the jacket 4, avoiding air resistance.

[0036] As a technical optimization of this utility model, both the servo motor 2 and the solenoid valve are electrically connected to an external controller.

[0037] In this embodiment, the servo motor 2 and the solenoid valve can be controlled by an external controller.

[0038] The working principle and usage process of this utility model are as follows: The material to be reacted is introduced into the reactor body 1 through the feed port. The servo motor 2 drives the double-layer stirring shaft to rotate. The upper stirring shaft 202 generates a strong downward flow in the conical guide tube 3. The material flows downward from the opening at the bottom of the conical guide tube 3. The lower stirring shaft 201 provides strong dispersion at the bottom. Together with the conical guide tube 3, it forces the material to directional large circulation. The downward fluid generated by the upper stirring shaft 202 is forced to flow downward along the inner wall of the conical guide tube 3. After reaching the bottom of the reactor, it is dispersed by the lower stirring shaft 201, forming a high-intensity global circulation flow field that is replenished upward along the reactor wall and then downward through the outside of the conical guide tube 3. This eliminates mixing dead zones. The heat transfer medium is transported to the jacket 4 through the liquid inlet pipe. The horizontally staggered bow-shaped baffles 401 force the heat transfer medium in the jacket 4 to form an S-shaped turbulent flow, which significantly improves the heat transfer coefficient of the jacket 4.

[0039] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A reaction vessel for producing guanidine carbonate, comprising a reaction vessel body (1), wherein a vessel cover (101) is provided at the top of the reaction vessel body (1), a feed pipe communicating with the reaction vessel body (1) is provided on the vessel cover (101), and a discharge pipe (102) with a solenoid valve installed on its outer wall is connected to the bottom of the reaction vessel body (1), characterized in that: The reactor body (1) is equipped with a stirring assembly inside; The stirring assembly includes a rotating shaft vertically arranged inside the reactor body (1), a servo motor (2) installed on the top of the reactor cover (101), the output end of the servo motor (2) being driven and connected to the rotating shaft through a reducer, a lower stirring shaft (201) fixedly connected to the lower part of the rotating shaft, an upper stirring shaft (202) fixedly connected to the upper part of the rotating shaft, and a conical guide tube (3) coaxially arranged inside the reactor body (1). The conical guide tube (3) is located around the upper stirring shaft (202). The upper opening edge of the conical guide tube (3) is fixed to the upper inner wall of the reactor body (1), and the lower end of the conical guide tube (3) has an open structure and is suspended. The outer wall of the reactor body (1) is provided with a jacket (4), which surrounds the cylindrical part of the reactor body (1). The inner cavity of the jacket (4) is provided with multiple horizontally arranged and staggered baffles (401), which have an arc-shaped structure.

2. The reaction vessel for producing guanidine carbonate according to claim 1, characterized in that: The bottom end of the rotating shaft is fixedly connected to a scraper (203) that is adapted to the bottom end of the inner wall of the reactor body (1).

3. The reaction vessel for producing guanidine carbonate according to claim 1, characterized in that: The conical guide tube (3) has a structure with a large diameter at the upper end and a small diameter at the lower end.

4. The reaction vessel for producing guanidine carbonate according to claim 1, characterized in that: The lower stirring shaft (201) is a three-bladed swept-back stirring impeller, and the upper stirring shaft (202) is a wide-bladed airfoil axial flow impeller.

5. The reaction vessel for producing guanidine carbonate according to claim 1, characterized in that: The outer wall of the jacket (4) is connected to an inlet pipe located above and an outlet pipe located below.

6. The reaction vessel for producing guanidine carbonate according to claim 1, characterized in that: The servo motor (2) and the solenoid valve are both electrically connected to an external controller.

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