Simple precipitation filtering device

Abstract

The utility model discloses a simple precipitation filtering device, which relates to the field of high polymer material separation and comprises a precipitation tank main body, a stirring mechanism is arranged in the precipitation tank main body, the top of the precipitation tank main body is fixedly connected with a liquid inlet pipe and an air inlet pipe, and the liquid inlet pipe and the air inlet pipe are positioned on two sides of the stirring mechanism. One side of the upper end of the precipitation tank main body is fixedly connected with a precipitation agent inlet pipe, the bottom of the precipitation tank main body is fixedly connected with a discharge pipe and a liquid outlet pipe, the discharge pipe is provided with a valve, and the liquid outlet pipe is provided with a filtering mechanism. A sprayer is mounted at the top end in the precipitation tank main body, so that feed liquid is uniformly sprayed into a precipitation agent which is stirred at a high speed, sufficient contact between the feed liquid and the precipitation agent is ensured, the probability that a solvent is embedded by a polymer due to insufficient contact between the feed liquid and the precipitation agent is reduced, and the precipitation efficiency is improved; the precipitation and filtration device integrates precipitation, stirring, washing and filtration, so that a polymer product is prevented from being transferred back and forth, and the defects of low production efficiency and large material loss are effectively overcome.

Description

Technical Field

[0001] The utility model relates to the field of polymer material separation, in particular to a simple precipitation and filtering device. Background Art

[0002] Solution polymerization refers to the process of polymerizing monomers and initiators dissolved in appropriate solvents. It is an important method for synthesizing polymer materials. Although solution polymerization has the advantages of low system viscosity, easy mixing and heat transfer, easy temperature control, weak gel effect, and no local overheating, the copolymer products synthesized by solution polymerization are dissolved in the solvent, and usually the solvent needs to be removed before the desired polymer can be obtained.

[0003] At present, there are two main ways of desolventization: one is the direct desolventization process, which generally uses heating, vacuuming or heating + vacuuming to convert the solvent into a gaseous state, thereby separating it from the polymer. For high molecular polymers, the viscosity of the solution will increase significantly with the removal of the solvent. Since the solvent on the surface of the high molecular polymer can be quickly removed, the surface solidification is formed, and the solvent inside the high molecular polymer is embedded and difficult to remove. Therefore, special equipment such as a twin-screw extruder is required to continuously update the surface of the high molecular polymer, so that the solvent inside is exposed to the surface due to the continuous renewal of the polymer surface, so that it is easy to evaporate and remove. However, the cost, size, and energy consumption of these desolventization equipment are very high, and they are more suitable for large-scale batch production. However, for some small and medium-scale experimental studies, it is obviously not suitable. The second is the precipitation desolventization process, which uses a precipitant to reduce the solubility of the extracted polymer in the solution to form a polymer precipitation process. This process has the advantages of simple equipment, low investment cost, and high product purity, and is particularly suitable for small and medium-scale production experimental research. The process of precipitation desolventization generally refers to injecting a certain concentration of polymer solution into a high-speed stirring precipitant. Since the polymer is soluble in the solvent but not in the precipitant, when the feed liquid is mixed with the precipitant, the solubility of the polymer will be reduced, so that the polymer will precipitate out of the solution. After filtering with a filtering device, the polymer can be separated from the solvent. However, the purity of the polymer product at this time is not high and still contains some solvent. The polymer product needs to be repeatedly stirred, washed and filtered 3-4 times with a precipitant to obtain a polymer product with higher purity.

[0004] However, the existing technology still performs intermittent operations manually. During the washing process, the product needs to be transferred back and forth between the precipitation equipment and the filtration equipment, which has the disadvantages of low production efficiency, large material loss, and being unfriendly to the health of operators and the environment. Utility Model Content

[0005] The purpose of the utility model is to provide a simple precipitation and filtration device in order to solve the above problems.

[0006] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0007] A simple sedimentation and filtration device comprises a sedimentation tank body, wherein a stirring mechanism is arranged inside the sedimentation tank body, a liquid inlet pipe and an air inlet pipe are fixedly connected to the top of the sedimentation tank body, the liquid inlet pipe and the air inlet pipe are located on both sides of the stirring mechanism, a sedimentation agent inlet pipe is fixedly connected to one side of the upper end of the sedimentation tank body, a discharge pipe and a liquid discharge pipe are fixedly connected to the bottom of the sedimentation tank body, a valve is installed on the discharge pipe, a filtering mechanism is arranged on the liquid discharge pipe, the discharge pipe is coaxial with the sedimentation tank body, a sprayer is fixedly connected to the top of the inside of the sedimentation tank body, and the sprayer is connected to the liquid inlet pipe.

[0008] Preferably, the sprayer is in the shape of a shower head.

[0009] Preferably, a water outlet pipe at the bottom of the sprayer is provided with a plurality of spray holes, the distance between the spray holes is three times the diameter of the spray holes, and the spray holes are arranged in a staggered manner.

[0010] Preferably, the filtering mechanism is a Y-type filter.

[0011] Preferably, a throttle valve is installed on the liquid outlet pipe, and the throttle valve is located below the filtering mechanism.

[0012] Preferably, a pressure reducing valve is installed on the air intake pipe.

[0013] Preferably, the stirring mechanism includes a motor, which is installed on the top of the precipitation tank body. The motor is connected to a stirring shaft through a transmission assembly. The stirring shaft is rotatably connected in the precipitation tank body, and a stirring blade is fixedly connected to the stirring shaft.

[0014] The beneficial effects are: a sprayer is installed at the top of the inner part of the precipitation tank body, so that the feed liquid is evenly sprayed into the high-speed stirring precipitant, ensuring that the feed liquid and the precipitant are fully in contact, reducing the probability of the solvent being embedded in the polymer due to insufficient contact between the feed liquid and the precipitant, and improving the precipitation efficiency; the precipitation and filtration device integrates precipitation, stirring, washing and filtration, eliminating the back and forth transfer of the polymer product, and effectively solving the shortcomings of low production efficiency and large material loss.

[0015] The additional technical features and advantages of the present invention will be more clearly explained in the following description, or can be understood through the specific practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the accompanying drawings:

[0017] Figure 1 It is a schematic diagram of a simple precipitation and filtration device described in the utility model;

[0018] Figure 2 It is a schematic diagram of a filtering mechanism of a simple sedimentation filtering device described in the utility model.

[0019] The accompanying drawings are marked as follows: 1. precipitation tank body; 2. motor; 3. stirring shaft; 4. stirring blade; 5. sprayer; 6. liquid inlet pipe; 7. precipitant inlet pipe; 8. air inlet pipe; 9. pressure reducing valve; 10. discharge pipe; 11. liquid outlet pipe; 12. valve; 13. filtering mechanism; 131. filter screen; 132. filtered liquid inlet; 133. filtered liquid outlet; 134. filter screen valve cover; 14. throttle valve. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0022] The utility model is further described below in conjunction with the accompanying drawings:

[0023] like Figure 1 As shown, a simple precipitation and filtration device comprises a precipitation tank body 1, in which a stirring mechanism is arranged, a liquid inlet pipe 6 and an air inlet pipe 8 are fixedly connected to the top of the precipitation tank body 1, a liquid mixture of a polymer and a solvent is injected into the precipitation tank body 1 through the liquid inlet pipe 6, the air inlet pipe 8 is connected with an external compressed air source, the liquid inlet pipe 6 and the air inlet pipe 8 are located on both sides of the stirring mechanism, a precipitation agent inlet pipe 7 is fixedly connected to one side of the upper end of the precipitation tank body 1, a discharge pipe 10 and a liquid outlet pipe 11 are fixedly connected to the bottom of the precipitation tank body 1, a valve 12 is installed on the discharge pipe 10, a filtering mechanism 13 is arranged on the liquid outlet pipe 11, the discharge pipe 10 is coaxial with the precipitation tank body 1, a sprayer 5 is fixedly connected to the top of the inside of the precipitation tank body 1, the sprayer 5 is connected with the liquid inlet pipe 6, the precipitation tank body 1 is a closed container, which can avoid the escape of harmful solvents, and effectively solves the disadvantages of being unfriendly to the health of operators and the environment.

[0024] The sprayer 5 is in the shape of a shower head to expand the spraying area. A plurality of spray holes are provided at the water outlet pipe at the bottom of the sprayer 5. The distance between the spray holes is three times the diameter of the spray holes. The spray holes are staggered to ensure uniform spraying of the liquid feed.

[0025] The filter mechanism 13 is a Y-type filter, and the internal structure of the filter mechanism 13 is as follows: Figure 2 As shown, the filter mechanism 13 includes a filter screen 131, a filtrate inlet 132, a filtrate outlet 133 and a filter screen valve cover 134. After the filter screen valve cover 134 is removed, the filter screen 131 can be easily taken out, which is convenient for cleaning and maintenance.

[0026] A throttle valve 14 is installed on the liquid outlet pipe 11, and the throttle valve 14 is located below the filtering mechanism 13. The throttle valve 14 is used to control the pressure inside the sedimentation tank body 1, thereby adjusting the filtering speed. A pressure reducing valve 9 is installed on the air inlet pipe 8. The stirring mechanism includes a motor 2, and the motor 2 is installed on the top of the sedimentation tank body 1. The motor 2 is connected to a stirring shaft 3 through a transmission assembly. The stirring shaft 3 is rotatably connected to the sedimentation tank body 1, and a stirring blade 4 is fixedly connected to the stirring shaft 3.

[0027] Working principle: When in use, the precipitant is injected into the precipitation tank body 1 through the precipitant inlet pipe 7, the motor 2 is started, the motor 2 drives the stirring shaft 3 to rotate, the stirring shaft 3 drives the stirring blade 4 to rotate for stirring, and then a certain concentration of feed liquid synthesized by solution polymerization reaction is injected into the liquid inlet pipe 6. The feed liquid contains polymer and solvent. The feed liquid is evenly sprayed into the precipitation tank body 1 through the sprayer 5. The falling feed liquid is sheared by the precipitant in high-speed spiral motion, so that the feed liquid and the precipitant are fully mixed, which reduces the probability of the solvent being embedded in the polymer due to insufficient contact between the feed liquid and the precipitant, and improves the precipitation efficiency. After the precipitation and stirring are completed, the throttle valve 14 on the liquid outlet pipe 11 is opened, and the compressed air is injected into the precipitation tank body 1 through the air inlet pipe 8. The pressure inside the precipitation tank body 1 is controlled by the pressure reducing valve 9. The mixture formed by the solvent and the precipitating agent is discharged through the liquid outlet pipe 11 under the action of its own gravity and the compressed air, and the polymer product is retained by the filter mesh 131 of the filtering mechanism 13. The filtration speed is adjusted by the throttle valve 14 and the pressure reducing valve 9. After the filtration is completed, the above operation is repeated until a high-purity polymer product is obtained, and then the valve 12 on the discharge pipe 10 is opened to collect the polymer product.

[0028] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A simple precipitation and filtration device, comprising a precipitation tank body (1), characterized in that: A stirring mechanism is provided inside the precipitation tank body (1); a liquid inlet pipe (6) and an air inlet pipe (8) are fixedly connected to the top of the precipitation tank body (1); the liquid inlet pipe (6) and the air inlet pipe (8) are located on both sides of the stirring mechanism; a precipitant inlet pipe (7) is fixedly connected to one side of the upper end of the precipitation tank body (1); a discharge pipe (10) and a liquid discharge pipe (11) are fixedly connected to the bottom of the precipitation tank body (1); a valve (12) is installed on the discharge pipe (10); a filtering mechanism (13) is provided on the liquid discharge pipe (11); the discharge pipe (10) is coaxial with the precipitation tank body (1); a sprayer (5) is fixedly connected to the top of the inside of the precipitation tank body (1); the sprayer (5) is connected to the liquid inlet pipe (6).

2. A simple precipitation and filtration device according to claim 1, characterized in that: The sprayer (5) is in the shape of a shower head.

3. A simple precipitation and filtration device according to claim 1, characterized in that: The water outlet pipe at the bottom of the sprayer (5) is provided with a plurality of spray holes, the distance between the spray holes is three times the diameter of the spray holes, and the spray holes are arranged in a staggered manner.

4. A simple precipitation and filtration device according to claim 1, characterized in that: The filtering mechanism (13) is a Y-type filter.

5. A simple precipitation and filtration device according to claim 1, characterized in that: A throttle valve (14) is installed on the liquid outlet pipe (11), and the throttle valve (14) is located below the filtering mechanism (13).

6. A simple precipitation and filtration device according to claim 1, characterized in that: A pressure reducing valve (9) is installed on the air inlet pipe (8).

7. A simple precipitation and filtration device according to claim 1, characterized in that: The stirring mechanism comprises a motor (2), wherein the motor (2) is mounted on the top of the precipitation tank body (1), the motor (2) is connected to a stirring shaft (3) via a transmission assembly, the stirring shaft (3) is rotatably connected in the precipitation tank body (1), and a stirring blade (4) is fixedly connected to the stirring shaft (3).

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