Solvent crystallization device

Abstract

The utility model discloses a solvent crystallization device which comprises a group of jacketed tube bundles, the jacketed tube bundles are arranged in a refrigerant container, a refrigerant is filled in the refrigerant container, and the jacketed tube bundles are completely immersed in the refrigerant; the jacketed tube bundle comprises an inner tube, a heating medium is filled in the inner tube, the inner tube is provided with a heating medium inlet and a heating medium outlet, an outer tube is sleeved outside the inner tube, the inner tube and the outer tube are not communicated with each other, a space between the inner tube and the outer tube is a crystallization cavity, and the crystallization cavity is provided with a crystallization cavity inlet and a crystallization cavity outlet. The crystallization device is large in heat exchange area and high in crystallization efficiency.

Description

Technical Field

[0001] The utility model relates to the field of chemical industry, in particular to a solvent crystallization device. Background Art

[0002] Solvent crystallization is a process that uses the law that the solubility of the solute in the solvent changes with temperature to achieve crystallization purification. In the prior art, solvent crystallization often adopts intermittent kettle operation. After the mixing reaction in the crystallization kettle, the solute is supersaturated in the solvent and crystals are precipitated by the refrigerant water in the jacket. The heat exchange area is composed of the jacket and inner coil of the crystallization kettle. However, since the inner coil is located inside the crystallization kettle and easily hinders the mixing of crystals, the inner coil cannot be densely arranged, and thus a large heat transfer area cannot be obtained. At the same time, since the heat exchange surface is far away from the medium, mass transfer needs to be strengthened, and a stronger stirring process is required. However, the high shear effect during the stirring process is not conducive to the growth of large-sized crystals, which in turn affects the crystallization efficiency. Utility Model Content

[0003] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a solvent crystallization device with a large heat exchange area and high crystallization efficiency.

[0004] In order to solve the above problems, the present invention provides the following technical solutions:

[0005] A solvent crystallization device includes a group of jacketed tube bundles, which are placed in a refrigerant container. The refrigerant container is filled with refrigerant, and the jacketed tube bundle is completely immersed in the refrigerant; the jacketed tube bundle includes an inner tube, which is filled with heat medium, and is provided with a heat medium inlet and a heat medium outlet. The inner tube is outer-mounted with an outer tube, and the inner tube and the outer tube are not connected to each other. The space between the inner tube and the outer tube is a crystallization cavity, and the crystallization cavity is provided with a crystallization cavity inlet and a crystallization cavity outlet.

[0006] It should be noted that the crystallization chamber between the inner and outer tubes of the solvent crystallization device of this application is the space for solvent crystallization. During use, by changing the length and number of the jacketed tube bundle, different production capacities can be matched. Different crystallization systems can be set with different inner and outer tube spacing to control the supersaturation of the mother liquor, which is conducive to stable crystallization and reduces mother liquor entrainment caused by crystal explosion.

[0007] In addition, during the crystallization process, the solution circulates continuously, and the refrigeration effect of the refrigerant causes the crystals to grow slowly and steadily on the inner wall of the outer tube. When the required solid-liquid ratio is reached, the mother liquor is discharged, and a low-temperature fresh solvent is introduced into the crystallization chamber to wash the surface of the crystal layer and clean the residual mother liquor. After washing is completed, the refrigerant temperature and the heat medium temperature are controlled to heat the crystal layer to the melting point of the crystal, melt the crystal, and discharge it to obtain a liquid product. This application solves the problems of small heat exchange area and poor heat transfer efficiency of traditional kettle crystallizers by setting multiple tube bundles, effectively improving the crystallization efficiency. In addition, the problem of difficult control of supersaturation in traditional kettle crystallizers can be solved by changing the diameter of the inner and outer tubes, thereby changing the distance between the inner and outer tubes.

[0008] The technical solution of the present invention also includes that adjacent inner tubes are interconnected end to end to form an interconnected heat medium pipeline, and the heat medium feed end and the heat medium discharge end of the interconnected inner tubes are both connected to the heat medium circulation device.

[0009] The technical solution of the present invention also includes that the refrigerant feed end and the refrigerant discharge end of the refrigerant container are both connected to a refrigerant circulation device.

[0010] Furthermore, both the heat medium circulation device and the refrigerant circulation device are equipped with temperature control systems, and both the heat medium circulation device and the refrigerant circulation device are in communication with a controller. Through the controller, the refrigerant and heat medium temperatures can be precisely adjusted, thereby improving the temperature controllability of the crystallization process.

[0011] Furthermore, to enhance the flexibility of the crystallization apparatus and better adapt it to different production capacities, the present invention further comprises a feed line located above the crystallization chamber, the feed line communicating with the chamber inlet, and a discharge line located below the chamber, the discharge line communicating with the chamber outlet. Valves are provided at both the chamber inlet and the chamber outlet. By controlling these valves, different jacketed tube bundles can be switched on and off to match varying crystallization production capacity requirements.

[0012] Preferably, the valve is a solenoid valve, which is electrically connected to the controller.

[0013] The technical solution of the present invention also includes that the refrigerant is one of cold water, ice-water mixture, and refrigerant, and the heat medium is one of hot water, steam, and heat transfer oil.

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

[0015] Compared with the prior art, the purpose of the present invention is to provide a solvent crystallization device with a large heat exchange area and high crystallization efficiency. In order to achieve the above technical effects, the present application sets up a group of jacketed tube bundles immersed in refrigerant. The jacketed tube bundles are inner and outer outer tubes. The inner tube is filled with heat medium. The space between the inner tube and the outer tube is a crystallization cavity. The design of a group of inner and outer tubes effectively improves the heat exchange area during the crystallization process. By changing the length and number of the jacketed tube bundles, different production capacities can be matched. In addition, during the crystallization process, by controlling the refrigerant temperature and the heat medium temperature, the efficiency of the crystallization process can be effectively improved. The present application solves the problems of small heat exchange area and poor heat transfer efficiency of traditional kettle crystallizers, effectively improving the crystallization efficiency. In addition, the problem of difficult control of supersaturation in traditional kettle crystallizers can be solved by controlling the distance between the inner and outer tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 Schematic diagram of the structure of a solvent crystallization device in a specific embodiment.

[0018] Among them, 1 is the refrigerant container, 2 is the refrigerant, 3 is the inner tube, 4 is the heat medium, 5 is the heat medium inlet, 6 is the heat medium outlet, 7 is the outer tube, 8 is the crystallization chamber, 9 is the crystallization chamber inlet, 10 is the crystallization chamber outlet, 11 is the heat medium circulation device, 12 is the refrigerant circulation device, 13 is the controller, 14 is the feed pipeline, 15 is the discharge pipeline, and 16 is the solenoid valve. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of 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 should fall within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be understood that the terms "center", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "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 purpose of simplifying the description of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] As can be seen from the accompanying drawings, a solvent crystallization device includes four jacketed tube bundles. The jacketed tube bundles are placed in a refrigerant container 1, which contains refrigerant 2 and is completely immersed in refrigerant 2. The jacketed tube bundles include an inner tube 3, which contains heat medium 4. The inner tube 3 is provided with a heat medium inlet 5 and a heat medium outlet 6. The inner tube 3 is outer-mounted with an outer tube 7. The inner tube 3 and the outer tube 7 are not connected to each other. The space between the inner tube 3 and the outer tube 7 forms a crystallization cavity 8, which is provided with a crystallization cavity inlet 9 and a crystallization cavity outlet 10. Adjacent inner tubes 3 are interconnected end to end, and the heat medium feed end and heat medium discharge end of the interconnected inner tubes 3 are both connected to a heat medium circulation device 11. The refrigerant feed end and refrigerant discharge end of the refrigerant container 1 are both connected to a refrigerant circulation device 12. The heat medium circulation device 11 and the refrigerant circulation device 12 are both provided with a temperature control system. The heat medium circulation device 11 and the refrigerant circulation device 12 are both communicatively connected to the controller 13. The refrigerant 2 is cold water, and the heat medium 4 is steam.

[0022] A feed pipe 14 is provided above the crystallization chamber 8, and the feed pipe 14 is connected to the crystallization chamber inlet 9. A discharge pipe 15 is provided below the crystallization chamber 8, and the discharge pipe 15 is connected to the crystallization chamber outlet 10. Each crystallization chamber inlet 9 and each crystallization chamber outlet 10 is provided with a solenoid valve 16, and the solenoid valve 16 is electrically connected to the controller 13.

[0023] During the crystallization process, the solvent enters the crystallization chamber from the feed pipe and flows out from the discharge pipe. The solvent circulates continuously, and the cooling effect of the refrigerant causes the crystals to grow slowly and steadily on the inner wall of the outer tube. When the required solid-liquid ratio is reached, the mother liquor is discharged, and a low-temperature fresh solvent is introduced into the crystallization chamber to wash the surface of the crystal layer and clean the remaining mother liquor. After washing, a heat medium is introduced, and the refrigerant and heat medium temperatures are controlled by a controller to heat the crystal layer to the melting point of the crystal, melt the crystal, and discharge it to obtain a liquid product. This application solves the problems of small heat exchange area and poor heat transfer efficiency of traditional kettle crystallizers by setting multiple tube bundles, effectively improving the crystallization efficiency.

[0024] Although the present invention has been described in detail with reference to the accompanying drawings and in conjunction with preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person skilled in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and such modifications or substitutions shall be within the scope of the present invention. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention shall be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope of protection of the claims.

Claims

1. A solvent crystallization device, characterized in that: The invention comprises a group of jacketed tube bundles, which are placed in a refrigerant container. The refrigerant container is filled with refrigerant, and the jacketed tube bundle is completely immersed in the refrigerant. The jacketed tube bundle comprises an inner tube, which is filled with heat medium. The inner tube is provided with a heat medium inlet and a heat medium outlet. An outer tube is provided outside the inner tube. The inner tube and the outer tube are not connected to each other. The space between the inner tube and the outer tube is a crystallization cavity, which is provided with a crystallization cavity inlet and a crystallization cavity outlet.

2. The solvent crystallization device according to claim 1, characterized in that: The adjacent inner tubes are connected to each other at their ends, and the heat medium feeding ends and heat medium discharging ends of the inner tubes that are connected to each other are both connected to the heat medium circulation device.

3. The solvent crystallization device according to claim 2, characterized in that: The refrigerant feeding end and the refrigerant discharging end of the refrigerant container are both communicated with the refrigerant circulation device.

4. The solvent crystallization device according to claim 3, characterized in that: The heat medium circulation device and the refrigerant circulation device are both provided with a temperature control system, and the heat medium circulation device and the refrigerant circulation device are both communicatively connected with the controller.

5. The solvent crystallization device according to claim 4, characterized in that: A feed pipeline is provided above the crystallization cavity and is connected to the crystallization cavity inlet. A discharge pipeline is provided below the crystallization cavity and is connected to the crystallization cavity outlet. Both the crystallization cavity inlet and the crystallization cavity outlet are provided with valves.

6. The solvent crystallization device according to claim 5, characterized in that: The valve is a solenoid valve, which is electrically connected to the controller.

7. The solvent crystallization device according to claim 1, characterized in that: The refrigerant is one of cold water, ice-water mixture, and refrigerant, and the heat medium is one of hot water, steam, and heat transfer oil.

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