Auger type continuous crystallization device

Abstract

The utility model discloses an auger type continuous crystallization device which comprises a melting kettle, the melting kettle is provided with a stirring device, the top end of the melting kettle is provided with a material inlet and a solvent inlet, the outer wall of the melting kettle is provided with a clamping sleeve I, an inner coil pipe I is arranged in the clamping sleeve I, and a heating medium is arranged in the inner coil pipe I and communicated with a heating medium circulating device; a discharging port is formed in the bottom of the melting kettle and communicated with at least one transversely-arranged packing auger through a pump machine, a driving motor is arranged on one side of the packing auger, the power output end of the driving motor is connected with a shaft of the packing auger, blades are fixed to the shaft, a crystal mush outlet is formed in the discharging end of the packing auger, a second clamping sleeve is arranged on the outer wall of the packing auger, and a second inner coil pipe is arranged in the second clamping sleeve. And a refrigerant is arranged in the inner coil pipe II which is communicated with the refrigerant circulating device. The scheme can effectively prevent crystals from hanging on the wall and being accumulated and blocked, and improves the crystallization process efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the chemical industry, in particular to a continuous screw auger crystallization device. BACKGROUND

[0002] Solvent crystallization or melt crystallization is a common unit operation in the chemical industry, which is often used in the separation and purification process of chemical monomers, drugs, etc. The residence time of crystallization operation is generally long, and the existing technology often uses kettle type batch operation. During the cooling or concentration crystallization process, as the crystal grows, the solid-liquid ratio continuously increases, which often causes the crystal to adhere to the wall. Once the crystal adheres to the wall, it will affect the heat transfer of the crystallization kettle and the medium in the kettle, thereby reducing the efficiency of the crystallization process. Moreover, the bottom crystal accumulation in the crystallization process is easy to block the crystallization kettle bottom valve and the discharge pipe. SUMMARY

[0003] In view of the deficiencies of the prior art, the technical problem to be solved by the present application is to provide a continuous screw auger crystallization device which can effectively prevent crystal adhesion and accumulation blockage, and improve the efficiency of the crystallization process.

[0004] To solve the above problems, the present application provides the following technical scheme:

[0005] A continuous screw auger crystallization device, comprising a melting kettle, the melting kettle is provided with a stirring device, the top end of the melting kettle is provided with a material inlet and a solvent inlet, the outer wall of the melting kettle is provided with a jacket one, the jacket one is provided with an inner coil one, the inner coil one is provided with a heat medium and is communicated with a heat medium circulating device; the bottom of the melting kettle is provided with a discharge port, the discharge port is communicated with at least one horizontally arranged screw auger through a pump, one side of the screw auger is provided with a driving motor, the power output end of the driving motor is connected with the shaft of the screw auger, the shaft is fixed with a paddle, the discharge end of the screw auger is provided with a crystal slurry outlet, the outer wall of the screw auger is provided with a jacket two, the jacket two is provided with an inner coil two, the inner coil two is provided with a refrigerant and is communicated with a refrigerant circulating device.

[0006] The device of the present application is provided with a melting kettle and at least one screw auger for continuous crystallization operation. It should be noted that the device can also be used for melt crystallization process with high mother liquor content.

[0007] The melting kettle is provided with a material inlet and a solvent inlet, and is provided with a stirring system, a jacket and an inner coil. The heat medium is introduced, and the material and solvent continuously enter the melting kettle. The length of the screw auger is determined according to the crystallization residence time and the transmission speed. The screw auger with jacket can pass the refrigerant, so that the crystallization heat can smoothly leave the system, ensuring the smooth progress of the crystallization process. The spiral stirring and conveying function of the screw auger effectively prevents the crystal from adhering to the wall. The device solves the problem of heat transfer affected by crystal adhesion in solvent crystallization or melt crystallization with high mother liquor content, and solves the problem of easy blockage of pipeline and valve in crystal slurry conveying process. The efficiency of the crystallization process is effectively improved.

[0008] In addition, the second jacket of the auger is provided with a segmented cooling device to realize temperature gradient reduction, thereby further improving the crystallization efficiency.

[0009] To further ensure the smooth progress of the crystallization process, the utility model discloses a technical scheme further includes, the pump machine intercommunication has two identical augers, two augers are connected in series, and the first auger's crystal slurry outlet is communicated with the second auger's feeding end, and two augers are all communicated with refrigerant circulating devices.

[0010] As preferred, the utility model discloses a technical scheme further includes, the auger is double -shaft self -cleaning formula auger.

[0011] To improve the heat exchange efficiency of the crystallization heat in the auger, ensure sufficient heat exchange area, and improve the crystallization efficiency, the utility model discloses a technical scheme further includes, the shaft and the paddle of the auger are all hollow structures that are mutually through, and the hollow structure is provided with refrigerant and is communicated with a refrigerant circulating device.

[0012] The utility model discloses a technical scheme further includes, the length of the auger is matched with the residence time and the transmission speed of the crystallization material in the auger, and the purpose is to ensure that the crystallization process is smoothly and fully completed.

[0013] The utility model discloses a technical scheme further includes, the heat medium is one of hot water, steam and heat conducting oil.

[0014] The utility model discloses a technical scheme further includes, the refrigerant is one of cold water, low temperature brine and refrigerant.

[0015] The beneficial effects of the present application are:

[0016] Compared with the prior art, the purpose of the present application is to provide a kind of auger type continuous crystallization device that can effectively avoid crystal wall hanging and accumulation blockage, improve the efficiency of crystallization process, the device of the present application is provided with a melting kettle and at least one auger for continuous crystallization operation, the melting kettle is provided with material inlet and solvent inlet, and is equipped with stirring and heating device, then enters the auger, the auger with jacket can pass refrigerant, so that the crystallization heat can smoothly leave system, ensure that the crystallization process is carried out smoothly, and the spiral stirring transport function of the auger effectively avoids crystal wall hanging, the present device solves the problem of heat transfer affected by crystal wall hanging in solvent crystallization or high mother liquor content melting crystallization, and simultaneously solves the problem of easy blockage of pipeline and valve in crystal slurry conveying process. Effectively improve the efficiency of crystallization process. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, and obviously, other drawings can also be obtained by those skilled in the art without creative labor.

[0018] Figure 1 The structure schematic diagram of the screw auger type continuous crystallization device in the specific embodiment.

[0019] Wherein, 1 is a melting kettle, 2 is a stirring device, 3 is a material inlet, 4 is a solvent inlet, 5 is a jacket one, 6 is an inner coil one, 7 is a pump, 8 is a screw auger, 9 is a driving motor, 10 is a shaft, 11 is a paddle, 12 is a crystal slurry outlet, 13 is a jacket two, 14 is an inner coil two. Specific embodiment

[0020] In order to make the person skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0021] In the description of the present application, it should be understood that the terms "center", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of describing the description of the present application for simplification, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application.

[0022] As can be seen from the drawings, a screw auger type continuous crystallization device, comprising a melting kettle 1, the melting kettle 1 is provided with a stirring device 2, the top end of the melting kettle 1 is provided with a material inlet 3 and a solvent inlet 4, the outer wall of the melting kettle 1 is provided with a jacket one 5, the jacket one 5 is provided with an inner coil one 6, the inner coil one 6 is provided with a heat medium and is communicated with a heat medium circulating device, the heat medium is steam; the bottom of the melting kettle 1 is provided with a discharge port, the discharge port is communicated with two screw augers 8 which are the same structure and are connected in series at the head and tail, for continuous operation of crystallization, the screw auger 8 is a double shaft self-cleaning screw auger, the length of the screw auger 8 matches the residence time and transmission speed of the crystallization material in the screw auger 8. One side of the screw auger 8 is provided with a driving motor 9, the power output end of the driving motor 9 is connected with the shaft 10 of the screw auger 1, the shaft 10 is fixed with a paddle 11, the discharge end of the screw auger 8 is provided with a crystal slurry outlet 12, the outer wall of the screw auger 8 is provided with a jacket two 13, the jacket two 13 is provided with an inner coil two 14, the inner coil two 14 is provided with a coolant and is communicated with a coolant circulating device, the coolant is cold water, the shaft 10 and the paddle 11 of the screw auger 8 are both hollow structures penetrating each other, the hollow structures are also provided with a coolant and are communicated with a coolant circulating device.

[0023] Although the present application has been described in detail with reference to the preferred embodiments, it should be understood that the application is not limited to those preferred embodiments. Without departing from the spirit and scope of the application, one of ordinary skill can make various modifications and substitutions to the embodiments of the present application. Any modification or substitution within the scope of the present application should be encompassed within the scope of the present application. Therefore, the scope of the present application should be defined by the appended claims.

Claims

1. A continuous screw-type crystallization apparatus, characterized by: The application relates to a crystallization device, which comprises a melting kettle, a stirring device, a material inlet and a solvent inlet arranged at the top end of the melting kettle, a jacket one arranged on the outer wall of the melting kettle, an inner coil one arranged in the jacket one, a heat medium arranged in the inner coil one and communicated with a heat medium circulating device, a discharge port arranged at the bottom of the melting kettle, a pump machine, at least one transversely arranged auger, a driving motor arranged on one side of the auger, a shaft connected with the driving motor, a paddle fixed on the shaft, a crystal slurry outlet arranged at the discharge end of the auger, a jacket two arranged on the outer wall of the auger, an inner coil two arranged in the jacket two, a refrigerant arranged in the inner coil two and communicated with a refrigerant circulating device.

2. Screw-continuous crystallization apparatus according to claim 1, characterized in that The pump machine is communicated with two augers with the same structure.

3. The auger-type continuous crystallization apparatus of claim 1, wherein: The auger is a double-shaft self-cleaning auger.

4. The auger-type continuous crystallization apparatus of claim 1, wherein: The shaft and the paddle of the auger are hollow structures penetrating each other, the hollow structures are arranged with refrigerant and communicated with a refrigerant circulating device.

5. The auger-type continuous crystallization apparatus of claim 1, wherein: The length of the auger is matched with the residence time and the transmission speed of the crystallized material in the auger.

6. The auger-type continuous crystallization apparatus of claim 1, wherein: The heat medium is one of hot water, steam and heat conducting oil.

7. The auger-type continuous crystallization apparatus of claim 1, wherein: The refrigerant is one of cold water, low-temperature brine and refrigerant.

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