Filtrate recovery device of plate-and-frame filter press for TGIC (triglycidyl isocyanurate) processing

Abstract

The utility model discloses a filtrate recovery device of a plate-and-frame filter press for TGIC (triglycidyl isocyanurate) processing, which comprises a filter press, one end of the filter press is respectively provided with a washing water inlet, a mother liquor inlet and a filtrate outlet from top to bottom, the washing water inlet is connected with a washing water input pipeline, the washing water input pipeline is provided with a washing water valve, and the mother liquor inlet is communicated with the filtrate outlet. Two washing water input pipes are arranged on the filter press, an air blowing pipe is arranged on the two washing water input pipes, the other end of the air blowing pipe is connected with an air pump, a movable liquid receiving tank is further arranged on the filter press, the liquid receiving tank can move to the position below the filter press and is used for receiving filtrate dripping from filter holes in a filter plate, and a liquid receiving tank moving mechanism is arranged on the filter press. According to the utility model, filtrate remained at the filtrate outlet holes of the filter plate and the filtrate outlet of the filter press can be effectively recovered, so that the waste of the filtrate is prevented, the yield of TGIC is further improved, the production cost is saved, and the filter plate can be widely applied to the field of TGIC processing.

Description

Technical Field

[0001] The utility model relates to the technical field of TGIC processing, in particular to a filtrate recovery device of a plate and frame filter press for TGIC processing. Background Art

[0002] TGIC (triglycidyl isocyanurate) is a curing agent used in powder coatings. It is widely used due to its good thermal stability, good weather resistance, excellent yellowing resistance and excellent mechanical properties. In the production and processing of TGIC, it is necessary to go through the process steps of synthesis, cyclization, filtration, water washing, distillation, etc. The filtration step is carried out on a plate and frame filter press. The mother liquor produced by the cyclization reaction is transported to the plate and frame filter press, and the salts such as NaCl in the mother liquor are filtered and separated by squeezing and filtration, and the filtered filtrate is transported to the next process to continue refining TGIC.

[0003] In existing production, a submerged flow plate and frame filter press is generally used to filter and separate the salt in the mother liquor. The filtrate separated by squeezing is discharged from the filtrate outlet of the plate and frame filter press through the filtrate outlet hole on the filter plate and collected through the filtrate buffer tank. The solid salt separated by squeezing stays on the filter cloth of the filter plate. After squeezing, the filter plate is opened to discharge the solid salt, and finally the plates are closed for loading. Before loading, the salt remaining on the filter cloth is rinsed with washing water. However, when the plate and frame filter press is opened, the filtrate remaining at the filtrate outlet hole and the filtrate outlet will drip down into the salt collection pool below as the filter plate is opened. Since the dripping filtrate contains a small amount of TGIC, allowing the remaining filtrate to drip will cause a waste of TGIC, affect the yield of TGIC, and thus increase production costs. Utility Model Content

[0004] The utility model aims to provide a filtrate recovery device for a plate-frame filter press for TGIC processing, so as to solve the problem that part of the filtrate cannot be collected during the filtration of the existing TGIC mother liquor, resulting in waste of TGIC.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a filtrate recovery device for a plate and frame filter press for TGIC processing, comprising a filter press, one end of the filter press is respectively provided with two washing water inlets, a mother liquor inlet and two filtrate outlets from top to bottom, the washing water inlet is connected to a washing water input pipe, a washing water valve is provided on the washing water input pipe near the washing water inlet, an air blowing pipe is connected to the two washing water input pipes and located between the washing water inlet and the washing water valve, the other end of the air blowing pipe is connected to an air pump, the filter press is also provided with a movable liquid receiving trough, the liquid receiving trough can be moved to the bottom of the filter press to receive the filtrate dripping from the filter holes on the filter plate of the filter press, and the filter press is provided with a liquid receiving trough moving mechanism.

[0006] To facilitate the movement of the liquid receiving trough, the liquid receiving trough moving mechanism includes a guide rod arranged on the filter press, a sliding block sleeved on the guide rod, a sliding hole adapted to the outer diameter of the guide rod is arranged on the sliding block, and the liquid receiving trough is fixed on the sliding block.

[0007] In order to facilitate the discharge of the filtrate in the liquid receiving tank, an openable and closable leak is arranged at the bottom of the liquid receiving tank, and a collecting tank docked with the leak is arranged on one side of the filter press.

[0008] Furthermore, in order to facilitate the discharge of the filtrate in the liquid receiving tank, the bottom of the liquid receiving tank is inclined, and the leakage port is located at the lower end of the bottom of the liquid receiving tank.

[0009] Furthermore, in order to facilitate the discharge of the filtrate in the liquid receiving tank, the bottom cross-section of the liquid receiving tank is a V-shaped structure.

[0010] In order to realize the automatic movement of the liquid receiving tank, the liquid receiving tank moving mechanism further comprises a driving cylinder arranged on the guide rod, and the telescopic part of the driving cylinder is connected to the sliding block.

[0011] In order to prevent the filtrate from flowing back toward the air pump along the air pipe due to excessive internal pressure of the filter press, a one-way valve is provided on the air pipe near the connection between the air pipe and the washing water input pipeline.

[0012] Preferably, the air pump is a nitrogen pump.

[0013] The beneficial effects of the utility model are as follows: 1. Before opening the filter plate to discharge the filtered solid salt, the utility model purges the filter press under the action of an air pump, blows most of the filtrate remaining at the filtrate outlet and the filtrate outlet into the filtrate pipeline and transports it to the filtrate buffer tank; at the same time, a movable liquid receiving tank is provided on the filter press, and before opening the filter plate, the liquid receiving tank moving mechanism automatically moves to the bottom of the filtrate outlet and the filtrate outlet, and when the filter plate is opened, the liquid receiving tank receives the small part of the filtrate remaining at the filtrate outlet and the filtrate outlet that cannot be blown away. The air pump purge and the liquid receiving tank work together to ensure that the filtrate filtered by squeezing will not be wasted, thereby improving the yield of TGIC.

[0014] 2. The bottom of the liquid receiving tank is tilted, and the cross section of the liquid receiving tank is V-shaped, so that the filtrate in the liquid receiving tank can be discharged from the leakage port at the lower end of the tank bottom.

[0015] 3. A one-way valve is installed at the connection between the air blowing pipe and the washing water input pipe to prevent the filtrate from flowing back along the air blowing pipe toward the air pump due to excessive internal pressure of the filter press.

[0016] 4. By designing the air pump as a nitrogen pump, the inert gas has stable chemical properties, ensuring that the blown gas will not affect the material.

[0017] The present utility model will be described in more detail below in conjunction with the drawings and embodiments. Description of the Drawings

[0018] Figure 1 It is the front view of the present utility model.

[0019] Figure 2 It is the side view of the structure of Embodiment 1 of the present utility model.

[0020] Figure 3 It is the assembly schematic diagram of the guide rod and the sliding block in the present utility model.

[0021] Figure 4 It is the cross-sectional view of the liquid receiving tank in the present utility model.

[0022] Figure 5 It is the schematic diagram of the filter plate structure of the plate and frame filter press in the present utility model.

[0023] Figure 6 It is the side view of the structure of Embodiment 2 of the present utility model. Detailed Embodiment

[0024] Embodiment 1, as Figures 1 to 5 shown, a filtrate recovery device for a plate and frame filter press used in TGIC processing, comprising a filter press 1, the filter press 1 being a submerged plate and frame filter press. It should be noted that the submerged plate and frame filter press is a prior art and will only be briefly described here. At one end of the filter press 1, two washing water inlets 11, one mother liquor inlet 12 and two filtrate outlets 13 are arranged from top to bottom. A group of filter plates 9 are arranged on the filter press 1, and washing water inlet holes 91, mother liquor inlet holes 92 and filtrate outlet holes 93 that are in one-to-one connection with each of the washing water inlets 11, mother liquor inlet 12 and filtrate outlets 13 are arranged on the filter plates 9. A washing water input pipe 14 is connected to the washing water inlet 11, and a washing water valve 141 is arranged on the washing water input pipe 14 near the washing water inlet 11. Blowing pipes 2 are connected to both of the washing water input pipes 14 and are located between the washing water inlet 11 and the washing water valve 141. The other ends of the blowing pipes 2 are connected to an air pump 3. Both of the two filtrate outlets 13 are connected to a filtrate pipe 61, and a washing water circulation pipe 71 is also connected to the filtrate pipe 6.

[0025] The working principles of the air pump 3 and the blowing pipe 2 are as follows: The mother liquor generated by the cyclization reaction enters the filter press 1 from the mother liquor inlet 12, reaches inside the filter plate 9 through the mother liquor inlet hole 92, is pressed inside the filter plate 9, and the filtrate generated by pressing is discharged from the filtrate outlet hole 93 to the filtrate outlet 13, then discharged from the filtrate outlet 13 and enters the filtrate buffer tank 6 along the filtrate pipe 61. At this time, the filtrate pipe valve 611 is in the open state, and the washing water valve 141 and the washing water circulation pipe valve 711 are in the closed state; Subsequently, under the action of the air pump 3, air is blown into the filter press 1. The gas passes through the blowing pipe 2, the washing water inlet 11, the washing water inlet hole 91 to reach the filtrate outlet hole 93, and finally blows out from the filtrate outlet 13, so as to blow out the filtrate remaining in the filtrate outlet hole 93 and the filtrate outlet 13, and transport it along the filtrate pipe 61 to the filtrate buffer tank 6; Then the filter plate 9 is opened to discharge the solid salt filtered out on the filter plate; Finally, the filter plate 9 is closed, the filtrate pipe valve 611 is closed, and the washing water valve 141 and the washing water circulation pipe valve 711 are opened. The washing water in the washing water tank 7 is pumped out, transported through the washing water input pipe 14 to wash the salt remaining on the filter plate 9, and the salt washed down by the washing water is carried back to the washing water tank 7 through the washing water circulation pipe 71. Transfer pumps 8 are provided on the washing water input pipe 14, the filtrate pipe 61, and the washing water circulation pipe 71.

[0026] To prevent the filtrate from flowing back towards the air pump along the blowing pipe due to excessive pressure inside the filter press 1, a one-way valve 21 is provided on the blowing pipe 2 near the connection between the blowing pipe 2 and the washing water input pipe 14. At the same time, to prevent the blown gas from affecting the material, the air pump 3 is a nitrogen pump, and the chemical properties of inert gases are stable.

[0027] In order to prevent a small amount of residual filtrate from dripping out of the filtrate outlet hole 93 and the filtrate outlet 13 after gas purging when the filter plate is opened, a movable liquid receiving tank 4 is also provided on the filter press 1. The liquid receiving tank 4 can be moved to the bottom of the filter press 1 to receive the filtrate dripping from the filtrate outlet hole 93 and the filtrate outlet 13 of each filter plate 9. The filter press 1 is provided with a liquid receiving tank moving mechanism 5. The liquid receiving tank moving mechanism 5 includes a guide rod 51 provided on the filter press 1, a sliding block 52 sleeved on the guide rod 51, and a sliding hole 521 adapted to the outer diameter of the guide rod 51 is provided on the sliding block 52. The liquid receiving tank 4 is fixed on the sliding block 52, and the liquid receiving tank 4 can move back and forth along the guide rod 51 through the sliding block 52. The liquid receiving tank moving mechanism 5 also includes a driving cylinder 53 disposed on the guide rod 51, the driving cylinder 53 is fixed on the guide rod 51 through a fixing seat 54, and the telescopic part of the driving cylinder 53 is connected to the sliding block 52. After the air pump 3 is purged and before the filter plate 9 is opened to discharge the solid salt, the liquid receiving tank 4 is pushed to move to the bottom of the filter press 1 by the driving cylinder 53, and then the filter plate 9 is opened, and the residual filtrate dripping from the washing water inlet 11 and the washing water inlet hole 91 is collected by the liquid receiving tank 4. After the collection is completed, the liquid receiving tank 4 is then driven to retract by the driving cylinder 53, and finally the filtered solid salt is discharged from the filter plate and falls downward into the salt collection pool 15 located below the filter press 1.

[0028] In order to discharge the filtrate in the liquid receiving tank 4, the bottom of the liquid receiving tank 4 is provided with an openable and closable leak 41, and the leak 41 is provided with a valve. A collecting tank 42 docking with the leak 41 is provided on one side of the filter press 1. The leak 41 is opened to discharge the filtrate in the liquid receiving tank 4 into the collecting tank 42. The bottom of the collecting tank 42 is provided with a pipeline connected to the liquid inlet of the filtrate buffer tank 6, and the filtrate in the collecting tank 42 is discharged into the filtrate buffer tank 6 through the pipeline to enter the next process. In order to facilitate the discharge of the filtrate in the liquid receiving tank 4, the bottom of the liquid receiving tank 4 is inclined, and the leak 41 is located at the lower end of the bottom of the liquid receiving tank 4; the bottom cross section of the liquid receiving tank 4 is a V-shaped structure.

[0029] Embodiment 2, as Figure 6 As shown, a movable liquid receiving tank 4 is respectively provided on both sides of the filter press 1, and the two liquid receiving tanks 4 are symmetrically arranged, and the rest is the same as in Example 1.

[0030] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model; or the above concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A filtrate recovery device for a plate and frame filter press used in TGIC processing, comprising a filter press (1). At one end of the filter press (1), two washing water inlets (11), a mother liquor inlet (12), and two filtrate outlets (13) are respectively arranged from top to bottom. A washing water input pipe (14) is connected to the washing water inlet (11). A washing water valve (141) is arranged on the washing water input pipe (14) close to the washing water inlet (11). It is characterized in that: An air blowing pipe (2) is connected to the two washing water input pipes (14) and is located between the washing water inlet (11) and the washing water valve (141). The other end of the air blowing pipe (2) is connected to an air pump (3). The filter press (1) is also provided with a movable liquid receiving tank (4). The liquid receiving tank (4) can be moved to the bottom of the filter press (1) to receive filtrate dripping from the filter holes on the filter plate. The filter press (1) is provided with a liquid receiving tank moving mechanism (5).

2. The filtrate recovery device of the plate and frame filter press for TGIC processing according to claim 1, characterized in that: The liquid receiving trough moving mechanism (5) comprises a guide rod (51) arranged on the filter press (1), a sliding block (52) sleeved on the guide rod (51), a sliding hole (521) adapted to the outer diameter of the guide rod (51) being arranged on the sliding block (52), and the liquid receiving trough (4) is fixed on the sliding block (52).

3. The filtrate recovery device of the plate and frame filter press for TGIC processing according to claim 2, characterized in that: The bottom of the liquid receiving tank (4) is provided with an openable and closable leakage port (41), and one side of the filter press (1) is provided with a collecting tank (42) connected to the leakage port (41).

4. The filtrate recovery device of the plate and frame filter press for TGIC processing according to claim 3, characterized in that: The bottom of the liquid receiving tank (4) is arranged obliquely, and the leakage opening (41) is located at the lower end of the bottom of the liquid receiving tank (4).

5. The filtrate recovery device of the plate and frame filter press for TGIC processing according to claim 4, characterized in that: The bottom cross section of the liquid receiving tank (4) is a V-shaped structure.

6. The filtrate recovery device of the plate and frame filter press for TGIC processing according to claim 2, wherein: The liquid receiving tank moving mechanism (5) further comprises a driving cylinder (53) arranged on the guide rod (51), and a telescopic portion of the driving cylinder (53) is connected to the sliding block (52).

7. The filtrate recovery device of the plate and frame filter press for TGIC processing according to claim 1, characterized in that: A one-way valve (21) is provided on the air blowing pipe (2) near the connection between the air blowing pipe (2) and the washing water input pipe (14).

8. The filtrate recovery device of the plate and frame filter press for TGIC processing according to claim 1, characterized in that: The air pump (3) is a nitrogen pump.

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