A double salt crystallization apparatus for producing sodium sulfate and ammonium sulfate

Abstract

The utility model provides a kind of double salt crystallization device of production sodium sulfate and ammonium sulfate, including reactor, upper cover, salt adding mechanism, cooling mechanism, reactor is sequentially divided into clear liquid section, transition section, reaction section from top to bottom, center tube is equipped in reactor, clear liquid section side is equipped with reaction liquid collection tank, reaction liquid collection tank is connected with the upper portion of center tube by pipeline, overflow pipe is equipped with in clear liquid section top side, reaction section is equipped with crystal taking port, salt adding mechanism includes salt adding circulating pump, salt adding pipe, salt adding circulating pump is arranged in upper cover center, outlet is connected with the upper end of center tube, upper cover salt adding mouth is communicated with the lower portion of center tube by salt adding pipe, cooling mechanism includes cooling circulating pump, external cooler, cooling circulating pump is arranged in upper cover, cooling circulating pump inlet passes through upper cover and extends into reactor clear liquid section, cooling circulating pump outlet is connected with the lower end of external cooler by pipeline, external cooler upper end is connected with liquid collection tank by pipeline.The utility model integrates reaction equipment, compact structure, comprehensive function.

Description

Technical Field

[0001] This utility model belongs to the field of chemical industrial equipment technology, and in particular relates to a double salt crystallization device for producing sodium sulfate and ammonium sulfate. Background Technology

[0002] Soda ash, scientifically known as sodium carbonate, is also commonly called soda ash, alkali ash, disodium carbonate, or soda ash. It is typically a white powder and is an important inorganic chemical raw material, primarily used in the production of flat glass, glass products, and ceramic glazes. It is also widely used in household detergents, acid neutralization, and food processing. Sodium carbonate is produced through methods such as the combined alkali production process, the ammonia-soda process, and the Lubrin process, and can also be refined from natural alkali. In the process of producing sodium bicarbonate as a byproduct of sodium sulfate, the commonly used equipment consists of two separate units: one for adding sodium sulfate to the mother liquor and the other for cooling. This process not only consumes a lot of energy, but also easily causes pipe blockages during material transfer. Furthermore, the salt addition system relies on stirring, which can lead to incomplete reaction, poor mass transfer, low conversion rate, and high equipment cost and footprint. Summary of the Invention

[0003] The technical problem solved by this invention is that the existing equipment for producing sodium sulfate by-product ammonium sulfate from sodium sulfate and ammonium bicarbonate requires two sets of devices for adding sodium sulfate to the mother liquor and for cooling. These two sets of devices are prone to pipe blockage during the material transfer process. The salt addition system relies on stirring, which can easily lead to insufficient reaction, poor mass transfer, and low conversion rate.

[0004] This invention provides a double salt crystallization apparatus for producing sodium sulfate and ammonium sulfate, comprising a reactor, a top cover at the top of the reactor, a salt adding mechanism, and a cooling mechanism. The reactor is divided into a clear liquid section, a transition section, and a reaction section from top to bottom. A central tube is provided inside the reactor, with its outlet located at the lower part of the reaction section. A reaction liquid collection tank is provided on one side of the clear liquid section of the reactor, and the reaction liquid collection tank is connected to the upper part of the central tube via a pipe. An overflow pipe is provided on one side of the top of the clear liquid section of the reactor. A crystal taking port is provided in the reaction section of the reactor. The salt adding mechanism includes a salt adding circulation pump and a salt adding pipe. The salt adding circulation pump is located at the center of the top cover, with its inlet extending through the top cover into the clear liquid section, and its outlet connected to the upper end of the central tube. The top cover has a salt adding port, which is connected to the lower part of the central tube via the salt adding pipe. The cooling mechanism includes a cooling circulation pump and an external cooler. The cooling circulation pump is located on the top cover, with its inlet extending through the top cover into the clear liquid section of the reactor. The cooling circulation pump outlet is connected to the lower end of the external cooler via a pipe, and the upper end of the external cooler is connected to the liquid collection tank via a pipe.

[0005] Furthermore, both the clear liquid section and the reaction section of the reactor are cylindrical, with the diameter of the clear liquid section being larger than that of the reaction section, and the transition section being an inverted frustum shape.

[0006] Furthermore, there are three crystal extraction ports, located at the upper, middle, and lower parts of the reactor reaction section, respectively.

[0007] Furthermore, a settling plate is provided at the upper part of the clear liquid section of the reactor. The settling plate is convex hemispherical and has a through hole in the middle, through which the outlet pipe of the salt circulation pump passes and is connected to the upper end of the central pipe.

[0008] Furthermore, the reactor is provided with a flow equalization plate at the bottom, which is positioned opposite the outlet of the central tube, and the flow equalization plate is a convex hemispherical shape.

[0009] This invention has the following advantages: The crystallization device for producing sodium sulfate and ammonium sulfate double salts is an integrated reaction device that combines system solution cooling, sodium sulfate solid addition, and simultaneous production of sodium sulfate / ammonium sulfate double salts. It avoids the material transfer problem of two separate devices for adding sodium sulfate to the mother liquor and cooling. Moreover, it has a compact structure and comprehensive functions, reducing equipment costs and saving floor space. At the same time, by setting up a salt circulation pump and a flow equalization plate, the materials are fully mixed, contacted, and reacted, improving reaction efficiency and product quality, and avoiding the problem of wall adhesion and caking caused by stirring and adding salt. Attached Figure Description

[0010] Figure 1 A schematic diagram of the double salt crystallization device for producing sodium sulfate and ammonium sulfate according to this utility model. Detailed Implementation

[0011] To clearly illustrate the technical features of this solution, specific embodiments are described below in conjunction with the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model.

[0012] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 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.

[0013] like Figure 1As shown, a double salt crystallization apparatus for producing sodium sulfate and ammonium sulfate includes a reactor 1, a top cover installed at the top of the reactor, a salt addition mechanism, and a cooling mechanism. The reactor 1 is divided into a clear liquid section, a transition section, and a reaction section from top to bottom. The reaction section is cylindrical and is the main reaction zone for sodium sulfate and ammonium sulfate in the mother liquor, generating sodium sulfate / ammonium sulfate double salt solids. The apparent flow velocity of the solution is 0.025-0.04 m / s. The transition section is truncated cone-shaped. As the solution flows upward, the flow velocity gradually decreases with the increase of the reactor diameter, and the double salt in the solution precipitates into the reaction section. The clear liquid section of the reactor 1 is cylindrical, and the diameter of the clear liquid section is larger than that of the reaction section. The apparent flow velocity of the solution decreases to above 0.045 m / s, further causing the solids in the solution to settle, making the clear liquid section a solution that is basically free of solids.

[0014] Reactor 1 is equipped with a central pipe 2, the outlet of which is located at the lower part of the reaction section. A reaction liquid collection tank 3 is located on one side of the clear liquid section of reactor 1, connected to the upper part of the central pipe 2 via a pipe. The reaction liquid collection tank 3 is used to collect different reaction liquids and allow them to enter the bottom of reactor 1 through the central pipe 2. An overflow pipe 4 is located on the top side of the clear liquid section of reactor 1, allowing the clear liquid from the upper part of reactor 1 to flow out into the next stage. The reaction section of reactor 1 is equipped with crystal extraction ports for removing the double salt solids within the reaction section. There are three crystal extraction ports, located at the upper, middle, and lower parts of the reaction section of reactor 1, respectively. The final location of the crystal extraction port is determined based on the particle size of the double salt solids in the reactor and the solid content at each extraction point.

[0015] A settling plate is installed at the top of the clear liquid section of reactor 1, connected to the top cover. The settling plate is a convex hemispherical shape. As the small particles of the double salt drift upward, they are blocked by the settling plate and accumulate in the arched space of the settling plate, growing larger and causing the double salt to settle further. The clear liquid overflows from the circumference of the settling plate, and the solid content of the solution flowing out from the overflow port is <5g / L. A through hole is provided in the middle of the settling plate, through which the outlet pipe of the salt circulation pump 6 passes and connects to the upper end of the central pipe 2. A flow equalization plate 5 is installed at the bottom of reactor 1, facing the outlet of the central pipe 2. The flow equalization plate 5 is a convex hemispherical shape, used to ensure that the solution entering the bottom of reactor 1 through the central cylinder 2 diffuses upward fully and evenly, ensuring that the heavier double salt can fully react and precipitate in the reaction section.

[0016] The salting mechanism includes a salting circulation pump 6 and a salting pipe. The salting circulation pump 6 is located in the center of the upper cover. The inlet of the salting circulation pump 6 passes through the upper cover and extends into the clear liquid section. The outlet is connected to the upper end of the central pipe 2. The upper cover is provided with a salting port 7, which is used to add solid sodium sulfate into the reactor 1. The salting port 7 is connected to the lower part of the central pipe 2 through the salting pipe. During the process of adding sodium sulfate to the reactor 1, the salting circulation pump 6 is used to draw the clear liquid from the upper part of the reactor 1 and input it into the central cylinder 2, so that a suction force is formed in the central cylinder 2, which carries the added solid sodium sulfate into the bottom of the reactor 1 for reaction.

[0017] The cooling mechanism includes a cooling circulation pump 8 and an external cooler 9. The cooling circulation pump 8 is installed on the upper cover, with its inlet extending through the upper cover into the clear liquid section of reactor 1. The outlet of the cooling circulation pump 8 is connected to the lower end of the external cooler 9 via a pipe, and the upper end of the external cooler 9 is connected to the liquid collection tank 3 via a pipe. The cooling circulation pump 8 is used to draw the clear liquid from the upper part of reactor 1, input it into the external cooler 9 for cooling, and then re-enter reactor 1 through the liquid collection tank 3. The cooling range can be flexibly adjusted according to the production process requirements; in this embodiment, the solution is cooled to 22-32℃.

[0018] All other parts of this utility model that are not described in detail belong to the prior art, and therefore will not be described in detail here.

[0019] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A double salt crystallization apparatus for producing sodium sulfate and ammonium sulfate, characterized in that, Includes a reactor, a top cover mounted on top of the reactor, a salt addition mechanism, and a cooling mechanism. The reactor is divided into a clear liquid section, a transition section, and a reaction section from top to bottom. A central pipe is installed inside the reactor, with its outlet located at the lower part of the reaction section. A reaction liquid collection tank is located on one side of the clear liquid section, connected to the upper part of the central pipe via a pipe. An overflow pipe is located on one side of the top of the clear liquid section, and a crystal sampling port is provided in the reaction section. The salting mechanism includes a salting circulation pump and a salting pipe. The salting circulation pump is located at the center of the upper cover. The inlet of the salting circulation pump passes through the upper cover and extends into the clear liquid section. The outlet is connected to the upper end of the central pipe. The upper cover has a salting port, which is connected to the lower part of the central pipe via the salting pipe. The cooling mechanism includes a cooling circulation pump and an external cooler. The cooling circulation pump is installed on the upper cover. The inlet of the cooling circulation pump passes through the upper cover and extends into the clear liquid section of the reactor. The outlet of the cooling circulation pump is connected to the lower end of the external cooler via a pipe. The upper end of the external cooler is connected to the liquid collection tank via a pipe.

2. The double salt crystallization apparatus for producing sodium sulfate and ammonium sulfate according to claim 1, characterized in that, Both the clear liquid section and the reaction section of the reactor are cylindrical, with the diameter of the clear liquid section being larger than that of the reaction section, and the transition section being an inverted frustum shape.

3. The double salt crystallization apparatus for producing sodium sulfate and ammonium sulfate according to claim 1, characterized in that, The crystal extraction port is provided in three locations, located at the upper, middle, and lower parts of the reactor reaction section, respectively.

4. The double salt crystallization apparatus for producing sodium sulfate and ammonium sulfate according to claim 1, characterized in that, The upper part of the clear liquid section of the reactor is equipped with a settling plate. The settling plate is convex hemispherical and has a through hole in the middle, through which the outlet pipe of the salt circulation pump passes and connects to the upper end of the central pipe.

5. The double salt crystallization apparatus for producing sodium sulfate and ammonium sulfate according to claim 1, characterized in that, The reactor is equipped with a flow equalization plate at the bottom, which is positioned opposite the outlet of the central tube. The flow equalization plate is a convex hemispherical shape.

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