Crystallizer with controllable crystal grains

Abstract

According to the crystallizer, a feeding solution is guided into an annular gap between the outer wall of a guide cylinder and the inner wall of a kettle body through a guide plate arranged below a feeding port and the guide cylinder arranged around a stirring paddle, and the feeding solution can be rapidly cooled in the annular gap through a coil pipe and a jacket which are arranged inside and outside; and the cooling rate is greatly improved, so that crystals with smaller particle sizes are obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of crystallization devices, in particular to a grain-controllable crystallizer. Background Art

[0002] Crystallization is a crucial unit operation in the chemical and pharmaceutical industries. Because the crystallization process can produce relatively pure crystals with a superior appearance from solutions containing relatively high levels of impurities, numerous chemicals and intermediates require the use of crystals. Furthermore, controlling the size of the crystals significantly impacts their discharging and post-processing. Therefore, smaller crystal sizes are often considered to improve production efficiency.

[0003] Generally speaking, factors affecting crystal size during crystallization include cooling rate and flow patterns. Existing crystallization equipment often suffers from factors such as inappropriate cooling or flow patterns, which slows down cooling and leads to larger crystals. For example, traditional borax crystallization typically utilizes evaporation and concentration coupled with conventional crystallization kettle cooling. Conventional crystallization kettles have low cooling efficiency, resulting in larger borax crystals and prone to clogging.

[0004] Therefore, it is necessary to propose a grain-controllable crystallizer to improve the grain size and enhance production efficiency. Utility Model Content

[0005] The utility model aims to provide a crystal grain controllable crystallizer, which is used to solve the defect of the crystal grain size being too large due to the uncontrollable crystal grain size of the crystallization device in the prior art.

[0006] In view of this, the solution of the utility model is:

[0007] A grain-controllable crystallizer comprises a kettle body, an agitator arranged inside the kettle body, and a cooling unit; a feed port is provided at the top of the kettle body, and a crystal discharge port is provided at the bottom; wherein: a guide plate located at the top and a guide tube located at the bottom are provided inside the kettle body; the guide plate is arranged below the feed port and is used to guide the material along the inner wall of the kettle body; the cooling unit comprises a jacket arranged at the bottom of the kettle body and a coil arranged inside the kettle body, and the coil is coiled on the outer wall of the guide tube; the agitator extends into the guide tube.

[0008] Furthermore, a mother liquid feed port is provided on the upper part of the kettle body, which is located above the guide plate; a mother liquid discharge port is provided at the bottom of the kettle body, and a filter is provided in the mother liquid discharge port; the mother liquid discharge port is connected to the mother liquid feed port through a pipeline.

[0009] Preferably, the crystal discharge port is provided with a pipeline at the bottom of the kettle body and extends horizontally at a certain angle, the mother liquor discharge port is connected to the extended pipeline, and the filter is provided on the side wall of the extended pipeline.

[0010] Furthermore, the end of the guide plate is flush with the outer wall of the guide cylinder in the vertical direction.

[0011] Furthermore, the agitator is an axial flow agitator.

[0012] Furthermore, a thermometer port and / or a liquid level gauge port is provided on the upper portion of the kettle body.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The crystallizer of the utility model guides the feed solution into the annular gap between the outer wall of the guide tube and the inner wall of the kettle body through the guide plate arranged below the feed port and the guide tube arranged around the stirring paddle. In the annular gap, the feed solution can be quickly cooled by the coils and jackets arranged inside and outside, greatly improving the cooling rate, thereby obtaining crystals with smaller particle size. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is an overall schematic diagram of the grain-controllable crystallizer provided by the present invention.

[0016] Among them: 1. Feed port; 2. Crystal discharge port; 3. Mother liquor discharge port; 4. Mother liquor feed port; 5. Thermometer port; 6. Liquid level gauge port; 10. Guide plate; 20. Guide tube; 30. Jacket; 40. Coil; 50. Agitator; 60. Filter screen; 100. Kettle body; 301. Cooling water inlet 1; 302. Cooling return water port 1; 401. Cooling water inlet 2, 402. Cooling return water port 2. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] It should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0019] It should also be noted that, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connected," "fixed," and "set" should be understood broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will readily understand the specific meanings of these terms in this utility model based on specific circumstances.

[0020] In one embodiment, Figure 1 As shown, a grain-controllable crystallizer is provided, comprising a kettle 100, an agitator 50 disposed inside the kettle 100, and a cooling unit; a feed port 1 is provided at the top of the kettle 100, and a crystal discharge port 2 is provided at the bottom; wherein:

[0021] The interior of the kettle body 100 is provided with a guide plate 10 located at the upper part and a guide tube 20 located at the lower part; the guide plate 10 is provided below the feed port 1 and is used to guide the material along the inner wall direction of the kettle body 100; the cooling unit includes a jacket 30 provided at the lower part of the kettle body 100 and a coil 40 provided inside the kettle body 100, and the coil 40 is coiled on the outer wall of the guide tube 20; the agitator extends into the guide tube 20.

[0022] In the above embodiment, the crystallizer guides the feed solution into the annular gap between the outer wall of the guide tube and the inner wall of the kettle body through the guide plate arranged below the feed port and the guide tube arranged around the stirring paddle. In the annular gap, it can be quickly cooled by the coils and jackets arranged inside and outside, greatly improving the cooling rate, thereby obtaining crystals with smaller particle size.

[0023] In a preferred embodiment, a mother liquor feed port 4 is provided at the top of the kettle 100, located above the guide plate 10; a mother liquor discharge port 3 is provided at the bottom of the kettle 100, and a filter screen 60 is provided within the mother liquor discharge port 3; and a pipeline (not shown) is provided to connect the mother liquor discharge port 3 to the mother liquor feed port 4. This method enables the recycling of the crystallization mother liquor, thereby improving the crystallization efficiency.

[0024] More preferably, a pipeline is provided at the bottom of the kettle body 100 and extends horizontally at a certain angle as a crystal discharge port 2, the mother liquor discharge port 3 is connected to the extended pipeline, and the filter screen 60 is provided on the side wall of the extended pipeline. This method can realize the filtration of the mother liquor while discharging the crystals outward.

[0025] In a preferred embodiment, the end of the guide plate 10 is flush with the outer wall of the guide tube 20 in the vertical direction, so that the material guided by the guide plate 10 can smoothly enter the annular gap to achieve rapid cooling and crystallization.

[0026] In a preferred embodiment, the agitator 50 is an axial flow agitator, which controls the flow direction by the inclination angle of the blades. The axial flow agitator can help the material form upper and lower vortices, increase the flow rate of the material in the annular gap, and is more conducive to forming a uniformly cooled fluid passing through the annular gap to achieve rapid cooling and crystallization, further increase the cooling rate, and reduce the particle size.

[0027] In a preferred embodiment, a thermometer port 5 and a liquid level gauge port 6 are further provided on the upper portion of the kettle body 100 for placing a thermometer and a liquid level gauge to facilitate monitoring of the crystallization temperature and the liquid level of the material.

[0028] In the above embodiment, the guide plate 10 can be configured as an annular guide plate, that is, symmetrically arranged around the stirring paddle 50 to allow material to flow into the annular gap in any direction. A common cooling medium is introduced into the jacket 30 and the coil 40 for cooling, and a bottom-in, top-out arrangement is provided to improve energy utilization. Specifically, for the jacket 30, a cooling water inlet 1 301 is provided near the bottom of the kettle body 100, and a cooling water return port 1 302 is provided above. For the coil 40, a cooling water inlet 2 401 is provided near the bottom of the kettle body 100, and a cooling water return port 2 402 is provided above.

[0029] In the above embodiments, the crystallization device also includes valves, instruments and meters commonly used in this field. Their settings and functions are conventional means and will not be described in detail here.

[0030] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A grain-controllable crystallizer, comprising a kettle (100), an agitator (50) disposed inside the kettle (100), and a cooling unit; the kettle (100) is provided with a feed inlet (1) at the top and a crystal discharge outlet (2) at the bottom; characterized in that: The interior of the kettle (100) is provided with a guide plate (10) located at the upper part and a guide tube (20) located at the lower part; the guide plate (10) is provided below the feed port (1) and is used to guide the material along the inner wall of the kettle (100); the cooling unit comprises a jacket (30) provided at the lower part of the kettle (100) and a coil (40) provided inside the kettle (100), and the coil (40) is coiled around the outer wall of the guide tube (20); the agitator extends into the guide tube (20).

2. The grain-controllable crystallizer according to claim 1, characterized in that: The upper portion of the kettle body (100) is further provided with a mother liquid feed port (4), which is located above the guide plate (10); the bottom of the kettle body (100) is provided with a mother liquid discharge port (3), and a filter screen (60) is provided in the mother liquid discharge port (3); the mother liquid discharge port (3) is provided with a pipeline in communication with the mother liquid feed port (4).

3. The grain-controlled crystallizer according to claim 2, characterized in that: The crystal discharge port (2) is extended horizontally at a certain angle from a pipeline provided at the bottom of the kettle body (100), the mother liquor discharge port (3) is laterally connected to the extended pipeline, and the filter screen (60) is provided on the side wall of the extended pipeline.

4. The grain-controllable crystallizer according to claim 1 or 2, characterized in that: The end of the guide plate (10) is flush with the outer wall of the guide cylinder (20) in the vertical direction.

5. The grain-controllable crystallizer according to claim 1, characterized in that: The stirrer (50) is an axial flow stirrer.

6. The grain-controllable crystallizer according to claim 1, characterized in that: The upper portion of the kettle body (100) is further provided with a thermometer port (5) and / or a liquid level gauge port (6).

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