Crystallization device for refining and purifying ethylene carbonate

Abstract

The utility model relates to the technical field of ethylene carbonate purification, in particular to a crystallization device for refining and purifying ethylene carbonate, which comprises a water tank, a crystallization treatment tank is arranged at the top of the water tank, a limit frame is arranged in the water tank, and a floating ball type water level sensor is arranged in the limit frame. An observation groove is formed in one side face of the exterior of the water tank, a plurality of electric water heating rods are arranged in the water tank, an air outlet plate is arranged at the top end of the interior of the water tank, and a plurality of air outlet holes are formed in the air outlet plate at equal intervals. The problems that after entering a crystallization treatment box through an air outlet, hot air cannot be uniformly distributed in the whole area, so that part of the area is heated insufficiently or overheated, crystallization filter holes are blocked after long-time use, and the purification effect is influenced are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of ethylene carbonate purification, in particular to a crystallization device used for refining and purifying ethylene carbonate. Background Art

[0002] Ethylene carbonate is an excellent organic solvent that can dissolve a variety of polymers. It can also serve as an organic intermediate, replacing ethylene oxide in dioxygenation reactions. It is the primary raw material for the transesterification process to produce dimethyl carbonate. It is also used as a raw material for the synthesis of furazolidone, as a water glass slurry, and as a fiber finishing agent. Ethylene carbonate is also an active intermediate in the production of lubricating oils and greases. Furthermore, it is used in lithium battery electrolytes, a key raw material in their manufacture. Ethylene carbonate is the most widely used solvent in these electrolytes. Therefore, the production of lithium batteries places extremely high demands on the quality of the ethylene carbonate used in these electrolytes.

[0003] And in the document with publication number CN213407783U, a device for purifying ethylene carbonate is mentioned. The device injects the ethylene carbonate solution to be purified into the inner cavity of the crystallization treatment box through the opening at the upper part of the crystallization treatment box. In the area formed by the heat conduction plate and the vertical partition, water is injected into the water tank through the water inlet, the water level is controlled by the water level plate, and the electric heating rod is started to heat the water. In the process of heating the water in the water tank by the electric heating rod, the hot air generated reaches the area below the inclined partition in the crystallization treatment box through the air outlet, and the heat is transferred to the upper part of the heat conduction plate through the heat conduction plate, and the solution on the upper part of the heat conduction plate is steam-heated and crystallized. The upper solution is generated in the process The gas is transmitted to the water tank through the connecting pipe for recycling. During the steam heating process, the steam pre-cooling liquid slides back into the water tank and can be reused. After the crystallization is completed, the electric heating rod is turned off. After natural cooling, water of a certain temperature is injected into the water inlet pipe to melt the ethylene carbonate in the crystals. After filtering through the vertical partitions, it is discharged and collected through the liquid outlet pipe to achieve the purification of ethylene carbonate. However, there are still certain defects that need to be optimized. The specific defects are as follows: After the hot air of the device enters the crystallization treatment box through the air outlet, it cannot be evenly distributed in the entire area, resulting in insufficient heating or overheating in some areas. At the same time, after long-term use, the crystallization filter pores will be blocked, affecting the purification effect.

[0004] Therefore, it is particularly important to design a crystallization device for refining and purifying ethylene carbonate to change the above technical defects and improve overall practicality. Utility Model Content

[0005] The purpose of the utility model is to provide a crystallization device for refining and purifying ethylene carbonate to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A crystallization device for refining and purifying ethylene carbonate comprises a water tank, a crystallization treatment box is provided on the top of the water tank, a limit frame is provided inside the water tank, a float type water level sensor is provided inside the limit frame, an observation slot is provided on one side of the outside of the water tank, a plurality of electric water heaters are provided inside the water tank, an air outlet plate is provided at the top end of the water tank, and a plurality of air outlet holes are provided on the air outlet plate at equal intervals;

[0008] A diverter plate is provided inside the crystallization treatment box, and several through openings are provided inside the diverter plate. First through grooves are provided on both sides of the through openings, and a second through groove is provided between every two through openings. Several air outlets are provided on the first through groove and the second through groove. A heat conduction plate is provided inside the crystallization treatment box, and the heat conduction plate is connected to the heat insulation plate. A crystallization filter plate is provided inside the heat conduction plate, and a positioning plate is provided on the top of the crystallization filter plate.

[0009] As a preferred solution of the present invention, an observation window is provided on the outside of the crystallization treatment box, a water inlet pipe is provided on one side of the crystallization treatment box, a liquid outlet pipe is provided on the other side of the crystallization treatment box, a connecting pipe is provided between the water tank and the crystallization treatment box, a water inlet is provided on the water tank, and a feed inlet is provided on the top of the crystallization treatment box.

[0010] As a preferred solution of the present invention, a groove is provided through one side surface of the limiting frame to facilitate water permeability, and the position of the observation groove is opposite to the limiting frame.

[0011] As a preferred solution of the present invention, a through pipe is provided between the air outlet and the through port, and both ends of the through pipe are fixedly connected to the air outlet and the through port respectively.

[0012] As a preferred solution of the present invention, a controller is provided on the outside of the water tank, and the float-type water level sensor is connected to the controller in a wireless manner, so as to facilitate real-time transmission of water level information in the water tank.

[0013] As a preferred solution of the present invention, the crystallization filter plate adopts a multi-layer composite structure, including a coarse filter layer, a fine filter layer and an adsorption layer, which are respectively used to remove large particle impurities, tiny suspended matter and harmful components, and the top of the crystallization treatment box is provided with a stepped limit groove, the inside of the stepped limit groove is provided with a sealing ring, the positioning plate is adapted to the stepped limit groove, and the positioning plate and the crystallization treatment box are fixed in position by bolts.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The utility model discloses a crystallization device for refining and purifying ethylene carbonate, which utilizes a structure including a float type water level sensor, a diverter plate, a through port, a through groove, an air outlet and a positioning plate. Ethylene carbonate solution is added to the crystallization area through the provided feeding port, water is filled into the water tank, the float water level sensor monitors the water level and transmits the information to the controller, the electric water heater is started to heat water, the hot gas passes through the air outlet plate and the through pipe to the diverter plate, and the heat is evenly distributed to the upper part of the heat conduction plate for steam heating crystallization. After the crystallization is completed, the heating is turned off, and warm water is injected to melt the crystals after natural cooling, and the crystals are filtered and discharged through the crystallization filter plate to achieve purification. The multi-layer structure of the filter plate removes impurities to ensure the purification effect, monitors the crystallization process, recovers the gas generated by steam heating, cleans or replaces the filter plate when needed, and reinstalls and fixes it to maintain the efficient operation of the device. The problem that the hot gas of the device cannot be evenly distributed in the entire area after entering the crystallization treatment box through the air outlet, resulting in insufficient heating or overheating in some areas, and the crystallization filter pores will be blocked after long-term use, affecting the purification effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a cross-sectional schematic diagram of the utility model as a whole;

[0018] Figure 3 It is a plan view of the manifold assembly of the utility model.

[0019] In the figure: 1. Water tank; 101. Limit frame; 102. Float-type water level sensor; 103. Observation slot; 104. Electric water rod; 105. Air outlet plate; 106. Air outlet; 2. Crystallization treatment box; 201. Diverter plate; 202. Through port; 203. First through slot; 204. Second through slot; 205. Air outlet; 206. Heat conduction plate; 207. Heat insulation plate; 3. Crystallization filter plate; 301. Positioning plate. DETAILED DESCRIPTION

[0020] The following will combine the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. Several embodiments of the present invention are provided. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0022] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] For examples, see Figure 1-3 , the utility model provides a technical solution:

[0025] A crystallization device for refining and purifying ethylene carbonate comprises a water tank 1, a crystallization treatment box 2 is provided on the top of the water tank 1, a limit frame 101 is provided inside the water tank 1, a float type water level sensor 102 is provided inside the limit frame 101, an observation slot 103 is provided on one side of the outside of the water tank 1, a plurality of electric water rods 104 are provided inside the water tank 1, an air outlet plate 105 is provided on the top of the water tank 1, a plurality of air outlet holes 106 are provided on the air outlet plate 105 at equal intervals, a diverter plate 201 is provided inside the crystallization treatment box 2, a plurality of through openings 202 are provided inside the diverter plate 201, a first through slot 203 is provided on both sides of the through opening 202, and every two through openings 203 are provided. 2 is provided with a second through groove 204, and a plurality of air outlets 205 are provided on the first through groove 203 and the second through groove 204. A heat conducting plate 206 is provided inside the crystallization treatment box 2, and the heat conducting plate 206 is connected to the heat insulating plate 207. A crystallization filter plate 3 is provided inside the heat conducting plate 206, and a positioning plate 301 is provided on the top of the crystallization filter plate 3. The ethylene carbonate solution to be purified is added to the area formed by the heat conducting plate 206 and the crystallization filter plate 3 through the feeding port, and then an appropriate amount of water is injected into the water tank 1 through the water feeding port on the water tank. The float type water level sensor 102 monitors the water level in real time and transmits the information to the controller wirelessly to ensure that the water level is within a safe range. Subsequently, the water level sensor 102 is started. The electric hot water rod 104 heats the water, and the generated hot air is discharged through the air outlet 106 on the air outlet plate 105, and is directed to the diverter plate 201 in the crystallization treatment box 2 through the through pipe. The opening 202 of the diverter plate 201 and the first through groove 203 and the second through groove 204 on both sides are designed to make the hot air evenly distributed, and the heat is transferred to the upper part of the heat conducting plate 206, and the solution on the upper part of the heat conducting plate 206 is steam-heated and crystallized. After the crystallization is completed, the electric hot water rod 104 is turned off, and after natural cooling, water of a certain temperature is injected into the water inlet pipe to melt the ethylene carbonate in the crystals, and the ethylene carbonate is filtered through the crystallization filter plate 3 and discharged and collected through the liquid outlet pipe, thereby achieving the crystallization of ethylene carbonate. Purification, wherein the multi-layer composite structure of the crystallization filter plate 3 - coarse filter layer, fine filter layer and adsorption layer, respectively, effectively removes large particle impurities, tiny suspended matter and harmful components in the solution to ensure the purification effect. During the crystallization process, the operator can monitor the internal situation of the crystallization treatment box 2 through the observation window to ensure the smooth operation. Steam heating crystallization, the generated gas is transmitted to the water tank 1 through the connecting pipe for recycling. When it is necessary to clean or replace the crystallization filter plate 3, the bolts on the top of the crystallization treatment box can be opened to separate the positioning plate 301 from the stepped limit groove, and the crystallization filter plate can be easily taken out for maintenance or replacement, and then reinstalled and fixed to ensure that the device continues to operate efficiently;

[0026] The outside of the crystallization treatment box 2 is provided with an observation window, one side of the crystallization treatment box 2 is provided with a water inlet pipe, the other side of the crystallization treatment box 2 is provided with a liquid outlet pipe, a connecting pipe is provided between the water tank 1 and the crystallization treatment box 2, a water inlet is provided on the water tank 1, and a feeding port is provided on the top of the crystallization treatment box 2. The crystallization device is assembled into a complete state. A slot is provided on one side of the limit frame 101 for water permeability. The position of the observation slot 103 is relative to the limit frame 101 for easy observation of the situation inside the crystallization treatment box. A through pipe is provided between the air outlet 106 and the through port 202, and the two ends of the through pipe are fixedly connected to the air outlet 106 and the through port 202 for easy hot air flow. It floats towards the diversion plate in a directional manner. A controller is provided on the outside of the water tank 1, and a float-type water level sensor 102 is connected to the controller wirelessly, which is convenient for real-time transmission of the water level information in the water tank 1. The crystallization filter plate 3 adopts a multi-layer composite structure, including a coarse filter layer, a fine filter layer and an adsorption layer, which are respectively used to remove large-particle impurities, tiny suspended matter and harmful components, and a stepped limit groove is provided on the top of the crystallization treatment box 2, and a sealing ring is provided inside the stepped limit groove. The positioning plate 301 is adapted to the stepped limit groove, and the positioning plate 301 and the crystallization treatment box 2 are fixed in position by bolts, which is convenient for replacing the crystallization filter plate 3. Blockage of the crystallization filter plate affects the effect.

[0027] The working process of the present invention is as follows: when using the crystallization device for refining ethylene carbonate, first, the ethylene carbonate solution to be purified is added to the area formed by the heat conducting plate 206 and the crystallization filter plate 3 through the feed port, and then an appropriate amount of water is injected into the water tank 1 through the water inlet on the water tank. The float-type water level sensor 102 monitors the water level in real time and transmits the information to the controller wirelessly to ensure that the water level is within a safe range. Subsequently, the electric water heater 104 is started to heat the water, and the generated hot air is discharged through the air outlet 106 on the air outlet plate 105, and is directed to the diverter plate 201 in the crystallization treatment box 2 through the through pipe. The through port 202 of the diverter plate 201 and the first through slot 203 and the second through slot 204 on both sides are designed to evenly distribute the hot air, and the heat is transmitted to the upper part of the heat conducting plate 206, and the solution on the upper part of the heat conducting plate 206 is steam-heated and crystallized. After the crystallization is completed After completion, turn off the electric water heater 104. After cooling naturally, use the water inlet pipe to inject water of a certain temperature to melt the ethylene carbonate in the crystals. After filtering through the crystallization filter plate 3, the water is discharged and collected through the liquid outlet pipe to achieve the purification of ethylene carbonate. The multi-layer composite structure of the crystallization filter plate 3 - coarse filter layer, fine filter layer and adsorption layer - can effectively remove large particle impurities, tiny suspended matter and harmful components in the solution to ensure the purification effect. During the crystallization process, the operator can monitor the internal situation of the crystallization treatment box 2 through the observation window to ensure the smooth operation. Steam heating crystallization, the generated gas is transmitted to the water tank 1 through the connecting pipe for recycling. When the crystallization filter plate 3 needs to be cleaned or replaced, the bolts on the top of the crystallization treatment box can be opened to separate the positioning plate 301 from the stepped limit groove, and the crystallization filter plate can be easily taken out for maintenance or replacement, and then reinstalled and fixed to ensure that the device continues to operate efficiently.

[0028] The standard parts used in this application document can all be purchased from the market, and the specific connection methods of each part adopt conventional means such as mature clip-on and threaded connection in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology. Among them, the float-type water level sensor and electric water heater belong to the existing mature technology. The control method is to control through a controller. The control circuit of the controller can be realized through simple circuit connection by technicians in this field, which is common knowledge in this field. Therefore, this application document will no longer explain the control method and circuit connection in detail.

[0029] 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 crystallization device for refining and purifying ethylene carbonate, comprising a water tank (1), characterized in that: A crystallization treatment box (2) is provided on the top of the water tank (1), a limit frame (101) is provided inside the water tank (1), a float type water level sensor (102) is provided inside the limit frame (101), an observation slot (103) is provided on one side of the outside of the water tank (1), a plurality of electric water rods (104) are provided inside the water tank (1), an air outlet plate (105) is provided at the top end of the inside of the water tank (1), and a plurality of air outlet holes (106) are provided on the air outlet plate (105) at equal intervals; The crystallization treatment box (2) is provided with a diverter plate (201) inside, and a plurality of openings (202) are provided inside the diverter plate (201), and a first through groove (203) is provided on both sides of the opening (202), and a second through groove (204) is provided between every two openings (202), and a plurality of air outlets (205) are provided on the first through groove (203) and the second through groove (204). The crystallization treatment box (2) is provided with a heat conduction plate (206) inside, and the heat conduction plate (206) is connected to the heat insulation plate (207). A crystallization filter plate (3) is provided inside the heat conduction plate (206), and a positioning plate (301) is provided on the top of the crystallization filter plate (3).

2. A crystallization device for refining and purifying ethylene carbonate according to claim 1, characterized in that: An observation window is provided on the outside of the crystallization treatment box (2), a water inlet pipe is provided on one side of the crystallization treatment box (2), a liquid outlet pipe is provided on the other side of the crystallization treatment box (2), a connecting pipe is provided between the water tank (1) and the crystallization treatment box (2), a water inlet is provided on the water tank (1), and a feed inlet is provided on the top of the crystallization treatment box (2).

3. A crystallization device for refining and purifying ethylene carbonate according to claim 2, characterized in that: A slot is provided through one side of the limiting frame (101) to facilitate water permeability, and the position of the observation slot (103) is opposite to the limiting frame (101).

4. A crystallization device for refining and purifying ethylene carbonate according to claim 1, characterized in that: A through pipe is provided between the air outlet hole (106) and the through port (202), and both ends of the through pipe are fixedly connected to the air outlet hole (106) and the through port (202).

5. A crystallization device for refining and purifying ethylene carbonate according to claim 1, characterized in that: A controller is provided outside the water tank (1), and the float-type water level sensor (102) is connected to the controller in a wireless manner, thereby facilitating real-time transmission of water level information in the water tank (1).

6. A crystallization device for refining and purifying ethylene carbonate according to claim 1, characterized in that: The crystallization filter plate (3) adopts a multi-layer composite structure, including a coarse filter layer, a fine filter layer and an adsorption layer, which are respectively used to remove large particle impurities, tiny suspended matter and harmful components, and the top of the crystallization treatment box (2) is provided with a stepped limit groove, the interior of the stepped limit groove is provided with a sealing ring, the positioning plate (301) is adapted to the stepped limit groove, and the positioning plate (301) and the crystallization treatment box (2) are fixed in position by bolts.

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