Catalyst recovery system in ethylene sulfate production

Abstract

The utility model provides a catalyst recovery system in ethylene sulfate production. The catalyst recovery system comprises a filtering tank, a cleaning tank and a vibrating screen classifier, the filtering tank is used for separating reaction completion liquid and a solid catalyst therein, a feeding hole is formed in the top of the filtering tank, and a solid discharging hole and a liquid discharging hole are formed in the bottom of the filtering tank; the cleaning tank is used for cleaning a solid catalyst, a feeding hole and a cleaning liquid inlet are formed in the top, and a cleaning liquid outlet and a solid discharge hole are formed in the bottom; the charging hole is connected with the solid discharging hole; the vibrating screen classifier is used for separating particles and powder of a solid catalyst, a feeding port is formed in the top of one side of the vibrating screen classifier, an oversize product outlet is formed in the tail end of the other side, and an undersize product outlet is formed in the bottom of the other side; and the feeding port is connected with the solid discharge port. The catalyst recovery system in ethylene sulfate production disclosed by the utility model is reasonable in structural design, and high-quality recovery of a solid catalyst can be realized through triple processes of filtering, cleaning and screening.

Description

Technical Field

[0001] The utility model belongs to the field of ethylene sulfate production equipment, and particularly relates to a catalyst recovery system in the production of ethylene sulfate. Background Art

[0002] Ethylene sulfate (DTD) is an SEI film-forming additive. As an additive for lithium-ion battery electrolytes, it can inhibit the decline of the initial capacity of the battery, increase the initial discharge capacity, reduce the expansion of the battery after high-temperature storage, improve the charge and discharge performance and cycle times of the battery. With the booming development of new energy vehicles and energy storage batteries, the demand for ethylene sulfate will be increasing.

[0003] Currently, the commonly used method for preparing ethylene sulfate is to use vinyl sulfite as the raw material and obtain ethylene sulfate through catalytic oxidation. The catalyst used is a solid catalyst with metal as the main active component. Such catalysts are relatively expensive. After the reaction, there are broken powders and some still-active solid catalysts in the solid catalyst. If directly discarded, it will cause an increase in costs and solid waste pollution. Therefore, the recovery of such solid catalysts has important social and economic value. The conventional method for recovering solid catalysts is to separate the solid catalyst from the reaction-completed liquid by filtration. This method is too rough, and the filter screen used for filtration is easily blocked; the separated solid catalyst will be doped with a large amount of reaction-completed liquid, and the broken powders are also mixed in and cannot be removed, affecting the recovery quality of the solid catalyst. Summary of the Utility Model

[0004] In view of this, to solve the above technical problems, the utility model provides a catalyst recovery system in the production of ethylene sulfate with a reasonable structural design, which can achieve high-quality recovery of solid catalysts through three processes of filtration - cleaning - screening.

[0005] To achieve the above object, the technical solution of the utility model is realized as follows:

[0006] A catalyst recovery system in the production of ethylene sulfate, comprising:

[0007] A filtration tank, which is used to separate the reaction-completed liquid and the solid catalyst therein; the filtration tank is provided with a feed inlet at the top, a solid discharge outlet and a liquid discharge outlet at the bottom;

[0008] A cleaning tank, which is used to clean the solid catalyst; the cleaning tank is provided with a feeding port, a cleaning liquid inlet at the top, a cleaning liquid outlet and a solid discharge port at the bottom; the feeding port is connected to the solid discharge outlet;

[0009] Vibrating sieve, which is used to separate the particles and powder of solid catalyst; a feeding port is provided at the top of one side of the vibrating sieve, an oversize outlet is provided at the end of the other side, and an undersize outlet is provided at the bottom of the other side; the feeding port is connected to the solid discharge port.

[0010] The reaction completion liquid enters the filtration tank from the feed port, and after filtration, the liquid is discharged from the liquid outlet and sent to the next process; the solid catalyst is discharged into the cleaning tank from the solid outlet, and in the cleaning tank, it is cleaned by the cleaning solvent to remove the doped reaction completion liquid; after the cleaning is completed, the cleaning liquid is discharged from the cleaning liquid outlet into the external post-treatment system, and the solid catalyst is discharged into the vibrating sieve from the solid discharge port. The vibrating sieve vibrates to shake off the doped powder, and the broken powder is discharged from the undersize outlet. The solid catalyst that has removed the doped reaction completion liquid and broken powder is discharged from the oversize outlet for recycling.

[0011] Further, the filtration tank includes a tank body and an overflow weir with a filter screen structure arranged in the inner cavity of the tank body; the overflow weir is vertically arranged, separating the inner cavity of the tank body into a material area and an overflow area; the feed port and the solid outlet are located on one side of the material area; the liquid outlet is located on one side of the overflow area.

[0012] The material falls into the material area through the feed port. Due to the existence of the overflow weir, the liquid will gather in the overflow area and then be discharged from the liquid outlet. And because the overflow weir is vertically arranged, it is not easy to be blocked while playing a good role in solid-liquid separation.

[0013] Further, the top of the overflow weir is serrated.

[0014] Further, the cleaning tank includes a shell, a stirrer arranged in the inner cavity of the shell, and a driving motor arranged at the top of the shell to drive the stirrer to stir.

[0015] The setting of the stirrer can improve the cleaning efficiency and optimize the cleaning effect, but the rotation speed of the stirrer should not be too high to prevent the solid catalyst from being broken.

[0016] Further, the stirrer includes a stirring shaft connected to the driving motor and stirring paddles arranged on the stirring shaft. The paddle surfaces of the stirring paddles are all arc-shaped to prevent hitting the solid catalyst.

[0017] Further, a filter screen is provided at the position corresponding to the cleaning liquid outlet at the bottom of the inner cavity of the shell to prevent solids from accidentally flowing into the cleaning liquid outlet.

[0018] Furthermore, the vibrating screening machine includes a shell, a screen obliquely arranged in the inner cavity of the shell, and a vibration motor arranged on the shell; the feeding port is located above the high side of the screen; the outlet for the material on the screen is located at the end of the low side of the screen; and the outlet for the material under the screen is located below the low side of the screen.

[0019] The material falls into the high side of the screen through the feeding port. Under the action of the vibration motor, the screen vibrates and shakes off the powder. At the same time, the powder falls through the screen to the bottom of the screen, and is discharged from the underscreen outlet and collected. The solid catalyst moves along the inclined screen to the overscreen outlet and is discharged and collected.

[0020] Furthermore, a material-push-away assembly is provided in the inner cavity of the outer shell; the material-push-away assembly is suspended on the higher side of the screen and is arranged downstream of the feeding port; the material-push-away assembly includes a mounting plate installed in the inner cavity of the outer shell, a vertically arranged elastic member connected to the mounting plate at one end, a connecting plate connected to the other end of the elastic member, and a material-push-away plate installed on the connecting plate; the material-push-away plate is vertically suspended above the screen and is used to push away the solid catalyst on the screen.

[0021] The material pusher assembly is used to push away the material that has fallen onto the screen to prevent material accumulation and facilitate material separation.

[0022] Furthermore, it also includes a screw conveyor 1; the feed end of the screw conveyor 1 is connected to the solid discharge port, and the discharge end of the screw conveyor 1 is connected to the feeding port.

[0023] Screw conveyor - is used to convey the solid catalyst discharged from the filter tank to the cleaning tank.

[0024] Furthermore, it also includes a second screw conveyor; the feed end of the second screw conveyor is connected to the solid discharge port, and the discharge end of the second screw conveyor is connected to the feeding port; the second screw conveyor is provided with a hot air inlet and a gas outlet connected to its inner cavity.

[0025] Screw conveyor 2 is used to transport the solid catalyst discharged from the cleaning tank to the screening machine; it is equipped with a hot air inlet and a gas outlet to connect to the hot air supply device to transport hot air into screw conveyor 2 to dry the solid catalyst entering. However, it should be noted that the temperature should not be too high and the wind force should not be too strong to ensure that the material is in a slightly moist state to avoid powder flying, polluting the environment and being detrimental to the subsequent screening process.

[0026] Compared with the prior art, the catalyst recovery system in vinyl sulfate production described in the utility model has the following advantages:

[0027] (1) The catalyst recovery system in the production of ethylene sulfate of the present utility model has a reasonable structural design. By using a filtration tank, a cleaning tank, and a vibrating screen, the triple processes of filtering, cleaning, and screening of the solid catalyst in the reaction-complete liquid are realized, removing the reaction-complete liquid and broken powder doped in the solid catalyst and improving the recovery quality.

[0028] (2) The filtration tank of the present utility model has good filtration effect and is not easily blocked. The cleaning tank can wash out the residual reaction-complete liquid doped in the solid catalyst, and the vibrating screen can separate the doped broken powder from the solid particles, improving the quality of the recovered solid catalyst. A material shifting component is arranged in the vibrating screen to optimize the screening effect. The second screw conveyor is provided with a hot air inlet and a gas outlet for preliminary drying of the material. Description of the Drawings

[0029] The drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation of the present utility model. In the drawings:

[0030] Figure 1 is a schematic structural diagram of the catalyst recovery system in the production of ethylene sulfate according to an embodiment of the present utility model;

[0031] Figure 2 is a schematic structural diagram of the overflow weir according to an embodiment of the present utility model;

[0032] Figure 3 is a schematic structural diagram of the material shifting component according to an embodiment of the present utility model.

[0033] Description of the Reference Numerals in the Drawings:

[0034] 1 - Filtration tank, 2 - First screw conveyor, 3 - Cleaning tank, 4 - Second screw conveyor, 5 - Vibrating screen, 6 - Tank body, 7 - Overflow weir, 8 - Feed inlet, 9 - Solid discharge port, 10 - Liquid discharge port, 11 - Material area, 12 - Overflow area, 13 - Shell, 14 - Stirrer, 15 - Driving motor, 16 - Feeding port, 17 - Cleaning liquid inlet, 18 - Cleaning liquid outlet, 19 - Solid discharge opening, 20 - Filter screen, 21 - Hot air inlet, 22 - Gas outlet, 23 - Outer shell, 24 - Sieve mesh, 25 - Material shifting component, 26 - Vibrating motor, 27 - Feeding opening, 28 - Oversize outlet, 29 - Undersize outlet, 30 - Mounting plate, 31 - Elastic member, 32 - Connecting plate, 33 - Material shifting plate. Detailed Embodiments

[0035] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0036] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, 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 should not be construed as a limitation to the present utility model. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0037] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific circumstances.

[0038] The present utility model will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0039] As Figures 1 to 3 shown, a catalyst recovery system in the production of ethylene sulfate includes a filtration tank 1, a screw conveyor 1 2, a cleaning tank 3, a screw conveyor 2 4, and a vibrating screen 5;

[0040] The filtration tank 1 is used to separate the reaction completion liquid and the solid catalyst therein; the filtration tank 1 includes a tank body 6 and an overflow weir 7 with a filter screen structure arranged in the inner cavity of the tank body 6; a feed inlet 8 is provided at the top of the tank body 6, and a solid discharge port 9 and a liquid discharge port 10 are provided at the bottom; the overflow weir 7 is vertically arranged, and its top is serrated. The overflow weir 7 divides the inner cavity of the tank body 6 into a material area 11 and an overflow area 12; the feed inlet 8 and the solid discharge port 9 are located on one side of the material area 11; the liquid discharge port 10 is located on one side of the overflow area 12;

[0041] The feed end of the screw conveyor 1 2 is connected to the solid discharge port 9;

[0042] The cleaning tank 3 is used for cleaning the solid catalyst; the cleaning tank 3 includes a housing 13, a stirrer 14 disposed in the inner cavity of the housing 13, and a driving motor 15 disposed at the top of the housing 13 to drive the stirrer 14 to stir; a feeding port 16 and a cleaning liquid inlet 17 are provided at the top of the housing 13, and a cleaning liquid outlet 18 and a solid discharge port 19 are provided at the bottom; the feeding port 16 is connected to the discharging end of the first screw conveyor 2; a filter screen 20 is provided at the position corresponding to the cleaning liquid outlet 18 at the bottom of the inner cavity of the housing 13; the stirrer 14 includes a stirring shaft connected to the driving motor 15 and stirring paddles disposed on the stirring shaft, and the paddle surfaces of the stirring paddles are all arc surfaces;

[0043] The feeding end of the second screw conveyor 4 is connected to the solid discharge port 19, and a hot air inlet 21 and a gas outlet 22 communicating with the inner cavity are provided on the second screw conveyor 4;

[0044] The vibrating screen 5 is used for separating the particles and powders of the solid catalyst; the vibrating screen 5 includes a housing 23, a screen 24 disposed obliquely in the inner cavity of the housing 23 and a material feeding component 25, and a vibrating motor 26 disposed on the housing 23; a feeding port 27 is provided above the high side of the screen 24 on the housing 23, a screen residue outlet 28 is provided at the end of the low side of the screen 24 on the housing 23, and a screen through material outlet 29 is provided below the low side of the screen 24 on the housing 23; the feeding port 27 is connected to the discharging end of the second screw conveyor 4; the material feeding component 25 is suspended above the high side of the screen 24 and is disposed downstream of the feeding port 27; the material feeding component 25 includes a mounting plate 30 mounted in the inner cavity of the housing 23, a vertically disposed elastic member 31 with one end connected to the mounting plate 30, a connecting plate 32 connected to the other end of the elastic member 31, and a material feeding plate 33 mounted on the connecting plate 32; the material feeding plate 33 is vertically suspended above the screen 23 and is used for separating the solid catalyst on the screen 23.

[0045] The working process of the catalyst recovery system in the production of ethylene sulfate according to the present utility model is as follows:

[0046] The reaction completion liquid enters the material area 11 of the filtration tank 1 from the feeding port 8, the liquid converges in the overflow area 12, and then is discharged from the liquid discharging port 10 and sent to the next process, while the solid catalyst enters the first screw conveyor 2 from the solid discharging port 9;

[0047] The first screw conveyor 2 sends the filtered solid catalyst into the cleaning tank 3, the stirrer 14 is started, and the injected cleaning solvent cleans the solid catalyst to remove the doped reaction completion liquid; after the cleaning is completed, the cleaning liquid is discharged from the cleaning liquid outlet 18 into an external post-treatment system, and the solid catalyst enters the second screw conveyor 4 from the solid discharging port 19, and hot air is introduced into the second screw conveyor 4 to preliminarily dry the incoming material;

[0048] The screw conveyor II 4 feeds the cleaned solid catalyst into the vibrating screen 5. The material falls into the higher side of the screen 24 through the feeding port 27. The material distributing component 25 pushes the material falling on the screen 24 away. Under the action of the vibrating motor 26, the screen 24 vibrates to shake off the powder. At the same time, the powder falls below the screen 24 through the screen 24 and is collected after being discharged from the undersize outlet 29. The solid catalyst moves along the inclined screen to the oversize outlet 28 and is collected after being discharged.

[0049] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A catalyst recovery system in the production of ethylene sulfate, characterized in that, include: A filter tank, the filter tank is used to separate the reaction completion liquid and the solid catalyst therein; the filter tank is provided with a feed inlet at the top, and a solid discharge port and a liquid discharge port at the bottom; the filter tank comprises a tank body, and an overflow weir of a filter screen structure arranged in the inner cavity of the tank body; the overflow weir is arranged vertically to divide the inner cavity of the tank body into a material area and an overflow area; the feed inlet and the solid discharge port are located on one side of the material area; the liquid discharge port is located on one side of the overflow area; A cleaning tank, which is used to clean the solid catalyst; the top of the cleaning tank is provided with a feed port and a cleaning liquid inlet, and the bottom is provided with a cleaning liquid outlet and a solid discharge port; the feed port is connected to the solid discharge port; A vibrating screening machine is used to separate particles and powder of a solid catalyst; a feeding port is provided at the top of one side of the vibrating screening machine, an oversize outlet is provided at the end of the other side, and an undersize outlet is provided at the bottom of the other side; the feeding port is connected to the solid discharge port.

2. The catalyst recovery system in the production of ethylene sulfate according to claim 1, wherein: The top of the overflow weir is sawtooth-shaped.

3. The catalyst recovery system in the production of vinyl sulfate according to claim 1, characterized in that: The cleaning tank comprises a shell, a stirrer arranged in the inner cavity of the shell, and a driving motor arranged on the top of the shell to drive the stirrer to stir.

4. The catalyst recovery system in the production of ethylene sulfate according to claim 3, wherein: The stirrer comprises a stirring shaft connected to the driving motor and a stirring paddle arranged on the stirring shaft, and the paddle surfaces of the stirring paddles are all cambered surfaces.

5. The catalyst recovery system in the production of vinylene sulfate according to claim 3, wherein: A filter screen is provided at a position at the bottom of the inner cavity of the shell corresponding to the cleaning liquid outlet.

6. The catalyst recovery system in the production of vinyl sulfate according to claim 1, wherein: The vibrating screening machine includes a shell, a screen arranged obliquely in the inner cavity of the shell, and a vibrating motor arranged on the shell; the feeding port is located above the high side of the screen; the screen-surface material outlet is located at the end of the low side of the screen; the screen-underface material outlet is located below the low side of the screen.

7. The catalyst recovery system in the production of vinylene sulfate according to claim 6, wherein: A material-prying assembly is provided in the inner cavity of the shell; the material-prying assembly is suspended on the higher side of the screen and is arranged downstream of the feeding port; the material-prying assembly includes a mounting plate installed in the inner cavity of the shell, a vertically arranged elastic member connected to the mounting plate at one end, a connecting plate connected to the other end of the elastic member, and a material-prying plate installed on the connecting plate; the material-prying plate is vertically suspended above the screen and is used to pry away the solid catalyst on the screen.

8. The catalyst recovery system in the production of vinylene sulfate according to any one of claims 1 to 7, characterized in that: It also includes a screw conveyor 1; the feed end of the screw conveyor 1 is connected to the solid discharge port, and the discharge end of the screw conveyor 1 is connected to the feeding port.

9. The catalyst recovery system in the production of ethylene sulfate according to any one of claims 1 to 7, characterized in that: It also includes a second screw conveyor; the feed end of the second screw conveyor is connected to the solid discharge port, and the discharge end of the second screw conveyor is connected to the feeding port; the second screw conveyor is provided with a hot air inlet and a gas outlet connected to its inner cavity.

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