Reactant filtering and recycling device

Abstract

The utility model discloses a reactant filtering and recycling device which comprises an elevated tank, the output end of the head tank is connected with the reaction kettle; the input end of the reaction kettle is further connected with a solvent tank, the elevated tank and the solvent tank add materials to the inner side of the reaction kettle, the output end of the reaction kettle is connected with a filtering device to filter the materials, a collecting device is arranged at the output end of the filtering device, and the filtering device is connected to one side of the reaction kettle. According to the device, the reaction liquid is filtered, clear liquid obtained after the reaction liquid is filtered is collected, and a catalyst or a solid material remaining in the filtering device is aerated through nitrogen, is connected with the solvent tank, is cleaned through a solvent and then is back-flushed into the reaction kettle, so that the filtered clear liquid is recycled, the catalyst or the solid material is recycled, and the use cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of chemical production, in particular to a reactant filtration and recovery device. Background Art

[0002] In the processes of fine chemical production, pharmaceutical production, petrochemical production, etc., many reactions involve the use of solid catalysts or solid materials. Such catalysts or excessive solid materials often still exist in the reaction liquid in solid form after the reaction. Generally, the treatment in production is to intercept the solids through sedimentation or filters. Some solids have the characteristics of high viscosity, easy blockage, and difficult filtration. This makes it possible for some solids to cause allergies, poisoning, etc. to personnel during the process of dealing with blocked pipelines and filters due to the different properties of the catalysts or solid materials, presenting certain safety risks.

[0003] Subsequently, it is difficult to recycle and dispose of such solids after the reaction. Currently, one method for treating solid catalysts or solid materials is to collect the solids uniformly through sedimentation or filtration. Then, the solids are incinerated as solid waste, and such a disposal method has a high cost; another method is to dissolve the catalysts or solid materials and treat them as wastewater in the next step, but there is no good treatment method for such wastewater, resulting in significant environmental problems. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the deficiencies existing in the prior art, and a reactant filtration and recovery device is proposed.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: A reactant filtration and recovery device, comprising:

[0006] A high-level tank;

[0007] The output end of the high-level tank is connected to a reaction kettle;

[0008] The input end of the reaction kettle is also connected to a solvent tank, and the high-level tank and the solvent tank add materials to the inside of the reaction kettle.

[0009] The output end of the reaction kettle is connected to a filtration device to filter the materials, and a collection device is arranged at the output end of the filtration device.

[0010] As a further description of the above technical scheme: The bottom of the filtration device is also connected to a gas storage tank to aerate the inside of the filtration device.

[0011] As a further description of the above technical solution: The output end of the high-level tank is connected to the feed port above the reaction kettle through a valve body. The output end of the solvent tank is connected to one side of the first pump body and then to another feed port above the reaction kettle, and the other side is connected to the input end above the filtration device.

[0012] As a further description of the above technical solution: The output port below the reaction kettle is connected to the input end at the bottom of the filtration device through a second pump body.

[0013] As a further description of the above technical solution: A three-way valve is provided at the bottom of the filtration device to control the input or output of materials to or from the filtration device.

[0014] As a further description of the above technical solution: A number of filter rods are provided inside the filtration device. After filtering the incoming liquid, it is transported to the inside of the collection device through the output end above.

[0015] As a further description of the above technical solution: The gas storage tank is connected to the filtration device through the three-way valve to aerate the inside of the filtration device.

[0016] As a further description of the above technical solution: One end of the three-way valve is connected to the input end of the reaction kettle.

[0017] As a further description of the above technical solution: A pressure gauge is connected to one side of the filtration device and the gas storage tank to monitor the pressure change of the gas storage tank.

[0018] As a further description of the above technical solution: The output ends of the first pump body and the second pump body are connected to a flowmeter.

[0019] The above technical solution has the following advantages or beneficial effects:

[0020] 1. A filtration device is connected to one side of the reaction kettle to collect the clarified liquid obtained by filtering the reaction liquid. The catalyst or solid material remaining in the filtration device is aerated with nitrogen, and after being washed with solvent by connecting to the solvent tank, it is backflushed into the reaction kettle. This not only realizes the recovery of the filtered clarified liquid but also recycles the catalyst or solid material, reducing the usage cost. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the filtration and recovery device proposed by the present utility model;

[0022] Figure 2 It is a schematic structural diagram of the filtration device in the present utility model.

[0023] Legend Explanation:

[0024] 1. High-level tank; 2. Reactor; 3. Solvent tank; 4. Filter device; 5. Collection device; 6. Gas storage tank; 7. First pump; 8. Second pump; 9. Three-way valve; 10. Pressure gauge; 11. Flow meter. Detailed implementation manner

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a 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 those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0026] Refer to Figure 1 - Figure 2 , an embodiment provided by the present invention: a reactant filtration and recovery device, including: a high-level tank 1; the output end of the high-level tank 1 is connected to the reactor 2; the input end of the reactor 2 is also connected to the solvent tank 3. The high-level tank 1 and the solvent tank 3 add materials to the inside of the reactor 2. The output end of the reactor 2 is connected to the filter device 4 to filter the materials, and a collection device 5 is provided at the output end of the filter device 4.

[0027] In this embodiment, raw materials for reacting with the solvent are added to the high-level tank 1, and a catalyst or solid material is added to the reactor 2. By opening the valve body below the high-level tank 1, under the action of gravity, it is transported to the inside of the reactor 2. The solvent tank 3 transports the solvent required for the reaction to the reactor 2 through the first pump 7. Through stirring, the raw materials, solvent, and catalyst or solid material are fully reacted, and the reacted mixed liquid is transported to the filter device 4 through the second pump 8 for filtration. The obtained clear liquid is transported to the collection device 5. The bottom of the filter device 4 is also connected to the gas storage tank 6 to aerate the inside of the filter device 4. The remaining catalyst or solid material is washed by adding solvent and aeration, and is flushed back into the reactor 2 for recycling.

[0028] F30 is sprayed inside the device, which has high corrosion resistance, good cleaning effect, long service life, and is resistant to strong acids and alkalis. Other materials of filter elements and filter devices can be selected under different processes and media. This application is applicable to solid catalysts, including Raney nickel, platinum carbon, palladium carbon, zinc granules, activated carbon, etc., and applicable solid raw materials, including powdered or granular solids such as hydroxylamine hydrochloride, ammonium carbonate, and potassium carbonate. It reduces the content of solid catalysts or solid materials in the clear liquid, reduces the pressure of "three wastes" treatment in light chemical enterprises, and at the same time reduces the use cost of solid catalysts or solid materials. By circulating between the reactor 2 and the filter device 4, the probability of blockage of solid catalysts or solid materials in pipelines, filter devices and other parts is reduced, the inspection and maintenance costs of enterprises are reduced, the occupational health impact and inspection safety impact on maintenance personnel are reduced, and the production efficiency of chemical enterprises is improved.

[0029] The output end of the high-level tank 1 is connected to the feed inlet above the reactor 2 through a valve body. The output end of the solvent tank 3 is connected to one side of the first pump body 7 and then to another feed inlet above the reactor 2, and the other side is connected to the input end above the filtering device 4.

[0030] In this embodiment, the output end of the high-level tank 1 is connected to the feed inlet above the reactor 2 to add a catalyst or solid material to the inside of the reactor 2. The output end of the solvent tank 3 transports the solvent into the reactor 2 through the first pump body 7. At this time, the valve body between the reactor 2 and the filtering device 4 is in a closed state, so that the solvent enters the filtering device 4 for reaction.

[0031] The output port below the reactor 2 is connected to the input end at the bottom of the filtering device 4 through the second pump body 8; a three-way valve 9 is arranged at the bottom of the filtering device 4 to control the input or output of materials to or from the filtering device 4; several filter rods are arranged inside the filtering device 4 to filter the incoming liquid, and then the filtered liquid is transported to the inside of the collection device 5 through the output end above.

[0032] In this embodiment, the filtering device 4 is a microfiltration filter, preferably a candle-type microfiltration filter, with several PTFE filter rods arranged inside. It is connected to the three-way valve 9 at the bottom. The output end of the reactor 2 is connected to the three-way valve 9 through the second pump body 8 to transport the mixed liquid in the reactor 2 to the bottom of the filtering device 4 for upward filtration, so that the filtered clear liquid enters the collection device 5 from the output end above, while the remaining catalyst or solid material remains in the microfiltration filter, part remains on the PTFE filter rods, and part is stored at the bottom of the filtering device 4. After cleaning or aeration, it is convenient to be backflushed from the bottom and transported back into the reactor 2 for recycling.

[0033] The output ends of the first pump body 7 and the second pump body 8 are connected to a flowmeter 11 to monitor the output flow rates of the solvent and the mixed liquid respectively, and calculate the input amount of the solvent through the flowmeter 11.

[0034] One end of the three-way valve 9 is connected to the input end of the reactor 2, and the gas storage tank 6 is connected to the filtering device 4 through the three-way valve 9 to aerate the inside of the filtering device 4. A pressure gauge 10 is connected to one side of the filtering device 4 and the gas storage tank 6 to monitor the pressure change of the gas storage tank 6.

[0035] In this embodiment, the filtering device 4 and the three-way valve 9 are connected to form five interfaces, namely the N1 feed port, the N2 backflush outlet, the N3 solvent inlet, the N4 clear liquid outlet, and the N5 nitrogen bubbling inlet. The valve body controls the switches. During the use process, the reaction kettle 2 is stirred to make the solid material disperse evenly in the solvent. Then, the valve body at the output end of the reaction kettle 2 is opened, the valve bodies at the N1 feed port and the N4 clear liquid outlet of the filtering device 4 are opened, and the second pump body 8 is turned on to filter the mixed liquid. After the filtration is completed, the valve bodies at the N1 feed port and the N4 clear liquid outlet are closed. At this time, the process of filtering the catalyst or solid material is completed. This process reduces the solid content in the clear liquid to about 0.1%, and the remaining catalyst or solid material is backflushed into the reaction kettle 2.

[0036] The specific operation process is as follows:

[0037] Put the raw materials into the high-position tank 1, open the feeding port of the reaction kettle 2, and put the solid catalyst (such as nickel, hydroxylamine hydrochloride, etc.) into the reaction kettle 2 from the feeding port. Open the valve body at the bottom of the high-position tank 1, and the raw materials enter the reaction kettle 2. Open the valve body of the solvent tank 3 and the first pump body 7, and close the N3 solvent inlet to make the raw materials, solvent and catalyst react.

[0038] After the reaction is completed, open the valve body at the output end of the reaction kettle 2, open the valve bodies at the N1 feed port and the N4 clear liquid outlet on the filtering device 4, and filter the mixed liquid in the filtering device 4 through the second pump body 8. The clear liquid flows into the collection device 6, and the solid catalyst remains in the filtering device 4. Close the valve body at the output end of the reaction kettle 2, and close the valve bodies at the N1 feed port and the N4 clear liquid outlet on the filtering device 4.

[0039] Open the valve body at the output end of the solvent tank 3, open the N3 solvent inlet valve and the N2 backflush outlet valve on the filtering device 4, and open the valve body at the input end of the reaction kettle 2. Pump the solvent in the solvent tank 3 into the filtering device 4 through the first pump body 7 to backflush the solid catalyst into the reaction kettle 2. Then close the valve body at the output end of the solvent tank 3, close the N3 solvent inlet valve and the N2 backflush outlet valve on the filtering device 4, and close the valve body at the input end of the reaction kettle 2.

[0040] When flushing, open the valve body from the solvent tank 3 to the reaction kettle 2, pump the solvent into the reaction kettle 2 through the first pump body 7 to cover the bottom, turn on the stirring of the reaction kettle 2, then open the N3 solvent inlet and the N2 backflush outlet at the filtering device 4, and pump the solvent in the solvent tank 3 into the filtering device 4 through the first pump body 7. Due to the pressure during the operation of the first pump body 7, the solvent flushes the filtering device 4 from top to bottom, and the solids on the PTFE filter rod and in the filtering device 4 are flushed into the reaction kettle 2. This backwashing process is carried out at least twice to ensure that the catalyst or solid material is flushed clean.

[0041] The recycled solid catalyst entering the reactor 2 reacts with the fresh raw materials and is recycled. If the reaction amount is insufficient, open the feeding port of the reactor 2, and add fresh solid catalyst from the feeding port of the reactor 2 to the reactor for supplementation.

[0042] The bottom of the filtration device 4 is connected to the gas storage tank 6. When cleaning the filter regularly, first open the valve at the output end of the solvent tank 3 and the N3 solvent inlet valve on the filtration device 4. Pump the solvent from the solvent tank 3 into the filtration device 4 through the first pump body 7. The amount of solvent is about half of the volume of the filtration device 4. After reaching the set amount calculated by the flow meter 11, the first pump body 7 is closed interlockingly, and the valve at the output end of the solvent tank 3 is closed. Open the N4 clear liquid outlet valve and the N5 nitrogen bubbling inlet valve on the filtration device 4. Nitrogen enters the filtration device 4 for bubbling for 5 to 10 minutes, and then close the N4 clear liquid outlet valve and the N5 nitrogen bubbling inlet valve on the filtration device 4. Repeat the above steps to complete the cleaning.

[0043] A gas storage tank 6 is arranged at the bottom of the filtration device 4, and nitrogen is released regularly for bubbling cleaning. The purpose is to prevent the catalyst or solid material from accumulating at the bottom for a long time and causing pipeline blockage. When regular cleaning is required, close the valve body at the N2 backflush outlet to ensure that the solvent remains in the filtration device 4. Open the valve body at the N5 nitrogen bubbling inlet, and bubble for 5 to 10 minutes. Then open the N2 backflush outlet again. Such a time interval ensures a high continuous production efficiency and a low residue of solids in the microfiltration filter. The nitrogen pressure is less than 0.1 MPa. The solids backflushed to the reactor continue to react with the next batch of raw materials and are recycled.

[0044] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A reactant filtration and recovery device, characterized in that, Including: High-level tank (1); The output end of the high-level tank (1) is connected to the reactor (2); The input end of the reactor (2) is also connected to the solvent tank (3). The high-level tank (1) and the solvent tank (3) add materials to the inside of the reactor (2). The output end of the reactor (2) is connected to a filtering device (4) to filter the materials. A collecting device (5) is arranged at the output end of the filtering device (4).

2. The device according to claim 1, characterized in that: The bottom of the filtering device (4) is also connected to an air storage tank (6) to aerate the inside of the filtering device (4).

3. The device according to claim 1, characterized in that: The output end of the high-level tank (1) is connected to the feed inlet above the reactor (2) through a valve body. The output end of the solvent tank (3) is connected to another feed inlet above the reactor (2) on one side of a first pump body (7) and to the input end above the filtering device (4) on the other side.

4. The device according to claim 3, characterized in that: The output port below the reactor (2) is connected to the input end at the bottom of the filtering device (4) through a second pump body (8).

5. The device according to claim 2, characterized in that: A three-way valve (9) is arranged at the bottom of the filtering device (4) to control the input or output of materials to or from the filtering device (4).

6. The device according to claim 1, wherein: A number of filter rods are arranged inside the filtering device (4). After filtering the incoming liquid, it is transported to the inside of the collecting device (5) through the output end above.

7. The device according to claim 5, wherein: The air storage tank (6) is connected to the filtering device (4) through the three-way valve (9) to aerate the inside of the filtering device (4).

8. The device according to claim 5, characterized in that: One end of the three-way valve (9) is connected to the input end of the reactor (2).

9. The device according to claim 5, characterized in that: A pressure gauge (10) is connected to one side of the filtering device (4) and the air storage tank (6) to monitor the pressure change of the air storage tank (6).

10. The device according to claim 4, characterized in that: The output ends of the first pump body (7) and the second pump body (8) are connected to a flowmeter (11).

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