Coupling filtering equipment of heterogeneous catalyst for preparing diisooctyl phenyl phosphite and filtering method thereof

Abstract

The coupling filtering equipment comprises a base plate, a decoloring kettle and a tank body, a plunger mechanism connected with the decoloring kettle and the tank body is arranged on the base plate, a filter screen is arranged in the tank body, a box body is arranged on the base plate, and the filter screen is arranged in the box body. A plunger mechanism is arranged in the box body, an ion filtering membrane plate is movably arranged in the box body, and a reciprocating assembly connected with the plunger mechanism and the ion filtering membrane plate is arranged on the base plate. Through the linkage design of the plunger mechanism, the reciprocating assembly and a multi-stage filtering structure, continuous operation of filtering, ion interception and catalyst recovery is achieved; material transfer and pressure establishment can be completed through one-time action of the plunger mechanism, the reciprocating assembly synchronously drives an ion filtering membrane plate to conduct reciprocating compression through the same power source, a dynamic extrusion-relaxation filtering mode is formed, filtrate permeation is accelerated, and membrane surface concentration polarization is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of chemical engineering separation technology, and in particular to a coupling filter device for a heterogeneous catalyst for preparing monophenyl diisooctyl phosphite and a filtering method thereof. BACKGROUND

[0002] As a cadmium-free and environmentally friendly primary antioxidant for polyvinyl chloride, monophenyl diisooctyl phosphite is generally synthesized by acid-alcohol continuous esterification / ester exchange process of phenol, isooctanol and phosphorus trichloride or phosphorous acid. In order to inhibit side reactions and shorten reaction time, industrial devices often introduce acidic or Lewis acid type heterogeneous solid catalysts. Although such catalysts perform well in terms of activity and selectivity, they are prone to form stable colloidal dispersions with the liquid after the reaction due to their small particle size and high specific surface area. Multiple cycles of washing are required to reduce the mass fraction of the catalyst to an acceptable range for subsequent decolorization, deacidification and molecular distillation processes using conventional vacuum filtration, plate and frame pressure filtration or centrifugal separation methods, resulting in the entire post-treatment section becoming a bottleneck that restricts the production capacity of the device.

[0003] On the other hand, the esterification process is accompanied by the dissolution of a small amount of acidic impurities and metal ions. If these are not effectively intercepted before entering the decolorization kettle, it will significantly increase the amount of activated clay or activated carbon required and cause the secondary precipitation of ionic impurities in the subsequent high-temperature distillation process, affecting the acid value, color and electrical insulation performance of the final product. The traditional approach is to add a one-time ion exchange resin bed after decolorization, but the resin regeneration wastewater is large and needs to be replaced frequently, and the resin particles are easily contaminated by residual solid catalysts and deactivated, forming a new solid waste discharge point. SUMMARY

[0004] The present application aims to provide a coupling filter device for a heterogeneous catalyst for preparing monophenyl diisooctyl phosphite and a filtering method thereof to solve the problems raised in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions: A coupling filter device for a heterogeneous catalyst for preparing monophenyl diisooctyl phosphite, comprising a base plate and a decolorization kettle and a tank body arranged on the base plate respectively, a plunger mechanism being arranged on the base plate and connected with the decolorization kettle and the tank body respectively, and when the plunger mechanism is operated, the mixed solution in the decolorization kettle is first extracted and then injected into the tank body; A filter screen is arranged in the tank body, a box body is arranged on the base plate, an ion filter membrane plate is movably arranged in the box body, and the tank body and the box body are in communication, and the mixed solution filtered by the filter screen enters the box body; The base plate is provided with a reciprocating assembly connected with the plunger mechanism and the ion filter membrane plate, in the process of pushing the mixed solution into the tank by the plunger mechanism, the reciprocating assembly drives the ion filter membrane plate to move to the mixed solution inlet end of the tank to compress the space of the mixed solution and the ion filter membrane plate; when the plunger mechanism extracts the mixed solution in the decolorizing kettle, the ion filter membrane plate will move back. The base plate is provided with a recovery assembly connected with the tank.

[0006] The coupling filter equipment for preparing the heterogeneous catalyst of monophenyl diisooctyl phosphite: The plunger mechanism includes a cylinder shell and a piston in sliding fit with the cylinder shell, and the cylinder shell is arranged on the base plate. The end of the cylinder shell away from the piston is connected with the decolorizing kettle through a first conduit, and a first one-way valve is arranged on the first conduit.

[0007] The coupling filter equipment for preparing the heterogeneous catalyst of monophenyl diisooctyl phosphite: The side wall of the cylinder shell is provided with a second one-way valve, the horizontal height of the second one-way valve is greater than the horizontal height of the filter screen, and the side wall of the end of the cylinder shell close to the first one-way valve is connected with the second one-way valve through a second conduit. The bottom of the tank is connected with one end of the tank through a third conduit, and a third one-way valve is arranged on the third conduit.

[0008] The coupling filter equipment for preparing the heterogeneous catalyst of monophenyl diisooctyl phosphite: The plunger mechanism further includes a rotating shaft and a swing rod, the rotating shaft is arranged in rotation on the base plate, and one end of the swing rod is fixedly connected with the rotating shaft. The other end of the swing rod is rotationally connected with the piston through a connecting rod, and a speed reduction motor with an output end coaxially fixedly connected with one end of the rotating shaft is arranged on the base plate.

[0009] The coupling filter equipment for preparing the heterogeneous catalyst of monophenyl diisooctyl phosphite: The reciprocating assembly includes a transmission rod and a rotating rod arranged in rotation on the base plate respectively, the transmission rod and the rotating shaft are parallel to each other, and the length direction of the rotating rod is parallel to the sliding direction of the ion filter membrane plate.

[0010] The coupling filter equipment for preparing the heterogeneous catalyst of monophenyl diisooctyl phosphite: A first sprocket is arranged on the rotating shaft, and a second sprocket is arranged on the transmission rod, and the first sprocket and the second sprocket are connected through a chain. A first bevel gear is arranged on the transmission rod, and a second bevel gear is arranged on the rotating rod and is in mesh with the first bevel gear.

[0011] The coupling filter device for the heterogeneous catalyst for preparing monophenyl diisooctyl phosphite as described above: The reciprocating assembly further comprises a sliding rod and a sleeve base, one end of the sliding rod is fixedly connected with the ion filter membrane plate, and the other end extends to the outside of the box body, and the sleeve base is coaxially and slidingly sleeved on the outer wall of the rotating rod; Steel balls are rollingly embedded in the inner wall of the sleeve base, the outer wall of the rotating rod is provided with an annular track groove along the length direction of the rotating rod, the steel balls are also rollingly embedded in the annular track groove, and the sleeve base and the sliding rod are fixedly connected through a cross rod.

[0012] The coupling filter device for the heterogeneous catalyst for preparing monophenyl diisooctyl phosphite as described above: The recovery assembly comprises a collection pool, and the collection pool is fixedly installed on the base plate; The side wall of the box body away from the third one-way valve is connected in communication with the collection pool through a fourth conduit, and the collection pool is provided with a discharge valve.

[0013] A method for filtering the heterogeneous catalyst for preparing monophenyl diisooctyl phosphite by using the coupling filter device described above, characterized in that the method comprises the following steps: Step one: start the speed reducer, make the plunger mechanism enter the suction half cycle, pull the piston outward, open the first one-way valve under the negative pressure in the barrel cavity, and suck the mixed solution containing the heterogeneous catalyst and ion impurities in the decoloring kettle into the barrel cavity at one time, to complete the raw material transfer; Step two: switch the plunger mechanism to the pressure sending half cycle, push the piston inward, increase the pressure in the barrel cavity, close the first one-way valve, and open the second one-way valve first, so that the liquid is flushed into the tank body from top to bottom through the second conduit, the filter screen retains the solid catalyst, when the liquid level at the bottom of the tank body rises to make the static pressure exceed the opening pressure difference of the third one-way valve, the primary filtrate continuously flows into the box body through the third conduit, to realize the primary separation of solid and liquid; Step three: while pressure sending, the reciprocating assembly is driven by the same rotating shaft, the rotation is transmitted to the transmission rod through the sprocket and the chain, the rotating rod rotates through the bevel gear pair, the annular track groove cooperates with the steel balls to force the sleeve base to make linear reciprocating motion, the ion filter membrane plate is compressed to the liquid inlet end through the sliding rod, the liquid phase is promoted to pass through the membrane layer and retain ion impurities, when the plunger is pulled outward again, the membrane plate is automatically reset and relaxed, the membrane surface concentration difference polarization layer is removed, and the secondary separation of self-cleaning is completed. Step four: the clean filtrate through the membrane is gathered at the outlet end of the membrane plate under the continuous pushing of the membrane plate, flows into the collection tank through the fourth conduit, and is temporarily stored. When a batch of filtration is completed or the liquid level reaches the set value, the discharge valve is opened to send the purified monophenyl diisooctyl phosphite solution to the subsequent process, and the equipment enters the next cycle immediately after the discharge valve is closed.

[0014] Compared with the prior art, the present application has the following advantages: Through the linkage design of the plunger mechanism, the reciprocating assembly and the multi-stage filtering structure, continuous operation of filtering, ion interception and catalyst recovery is realized. The plunger mechanism can complete material transfer and pressure establishment in one action. The reciprocating assembly uses the same power source to synchronously drive the ion filtering membrane plate to reciprocate and compress, forming a "breathing type" filtering mode of dynamic extrusion-relaxation, which not only accelerates the filtration of the filtrate and reduces the concentration polarization on the membrane surface, but also automatically relaxes the membrane plate during the return stroke, thereby prolonging the service life of the membrane. The filtering screen and the ion filtering membrane plate are arranged in stages, which first intercepts the solid catalyst and then removes the ion impurities, thereby ensuring the cleanliness of the filtrate. The recovery assembly is directly connected to the tank, and the intercepted catalyst can be recovered in situ after filtration. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The overall structure of the coupling filter removal equipment for the heterogeneous catalyst for preparing monophenyl diisooctyl phosphite.

[0016] Figure 2 The tank body and the cylinder shell of the coupling filter removal equipment for the heterogeneous catalyst for preparing monophenyl diisooctyl phosphite.

[0017] Figure 3 The Figure 2 Enlarged view of position A in FIG.

[0018] Figure 4 The tank body and the cylinder shell of the coupling filter removal equipment for the heterogeneous catalyst for preparing monophenyl diisooctyl phosphite.

[0019] Figure 5 The Figure 4 Enlarged view of position B in FIG.

[0020] Figure 6 The overall structure of the coupling filter removal equipment for the heterogeneous catalyst for preparing monophenyl diisooctyl phosphite.

[0021] Figure 7 The Figure 6 Enlarged view of position C in FIG.

[0022] Figure 8 The sleeve seat of the coupling filter removal equipment for the heterogeneous catalyst for preparing monophenyl diisooctyl phosphite.

[0023] Figure 9 TheFigure 8 Enlarged view of point D in the middle.

[0024] Figure 10 A schematic diagram showing the disassembled rotor and sleeve in a coupled filtration device for preparing heterogeneous catalysts of phenyl diisooctyl phosphite.

[0025] In the diagram: 1. Substrate; 2. Decolorizing kettle; 3. Tank body; 4. Filter screen; 5. Box body; 6. Ion filter membrane plate; 7. Shell; 8. Piston; 9. First conduit; 10. First check valve; 11. Second conduit; 12. Second check valve; 13. Third conduit; 14. Third check valve; 15. Rotating shaft; 16. Swing rod; 17. Connecting rod; 18. Gear motor; 19. Transmission rod; 20. Rotating rod; 2001. Annular track groove; 21. First sprocket; 22. Second sprocket; 23. Chain; 24. First bevel gear; 25. Second bevel gear; 26. Slide rod; 27. Sleeve; 28. Steel ball; 29. ​​Crossbar; 30. Collection tank; 31. Fourth conduit; 32. Discharge valve. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0027] Please see Figures 1-10 As an embodiment of the present invention, a coupled filtration device for preparing a heterogeneous catalyst for phenyl diisooctyl phosphite includes a substrate 1 and a decolorizing vessel 2 and a tank 3 respectively disposed on the substrate 1. A plunger mechanism is disposed on the substrate 1 and is connected to the decolorizing vessel 2 and the tank 3 respectively. When the plunger mechanism is running, it can first extract the mixed solution from the decolorizing vessel 2 and then inject it into the tank 3. The tank 3 is equipped with a filter screen 4 inside, and a box 5 is provided on the base plate 1. An ion filter membrane plate 6 is movably arranged inside the box 5. The tank 3 and the box 5 are connected. The mixed solution filtered by the filter screen 4 will enter the box 5. A reciprocating assembly is provided on the substrate 1. The reciprocating assembly is connected to the plunger mechanism and the ion filter membrane 6. During the process of the plunger mechanism pushing the mixed solution into the tank 3 and simultaneously injecting the mixed solution into the box 5, the reciprocating assembly will drive the ion filter membrane 6 to move towards the mixed solution inlet end of the box 5 to compress the space between the mixed solution and the ion filter membrane 6. When the plunger mechanism extracts the mixed solution in the decolorizing kettle 2, the ion filter membrane 6 will move back to its original position. The substrate 1 is also provided with a recycling component, which is in communication with the housing 5.

[0028] In this embodiment, the plunger mechanism is the only power source of the entire equipment. The piston 8 can complete two half cycles of "pulling" and "pushing" in one reciprocating stroke. The outward pulling stroke creates negative pressure in the decolorization kettle 2, which draws the mixed solution containing catalyst and ionic impurities into the cylinder at one time. The inward pushing stroke pressurizes the same batch of liquid and sends it into the tank 3, providing continuous positive pressure for subsequent filtration without the need for an additional pump or compressed air. The feed liquid is first statically intercepted by the filter screen 4 inside the tank 3. The heterogeneous catalyst with larger particle size is retained upstream of the filter screen 4. The initial filtrate then enters the tank 5 and encounters the ion filter membrane plate 6 driven by the reciprocating component. The ion filter membrane plate 6 is mechanically linked with the plunger stroke. During the feeding stage, the plunger moves forward and the reciprocating assembly pushes the ion filter membrane plate 6 towards the liquid inlet simultaneously. The filter chamber volume is compressed, forming instantaneous high pressure, which accelerates the liquid phase to pass through the membrane layer and traps ion impurities. During the material extraction stage, the plunger retracts, the ion filter membrane plate 6 immediately resets, the filter chamber relaxes, and the concentration polarization layer on the membrane surface is detached by its own rebound disturbance, achieving self-cleaning. The clean filtrate that permeates through the membrane is discharged in real time by the recovery unit, completing the three-phase continuous separation of "solid-liquid-ion".

[0029] As a further embodiment of the present invention, the plunger mechanism includes a cylindrical shell 7 and a piston 8 that slides with the cylindrical shell 7, wherein the cylindrical shell 7 is disposed on the base plate 1; The end of the cylindrical shell 7 away from the piston 8 is connected to the decolorizing kettle 2 through a first conduit 9, and a first one-way valve 10 is provided on the first conduit 9; The side wall of the cylindrical shell 7 is provided with a second one-way valve 12. The horizontal height of the second one-way valve 12 is greater than the horizontal height of the filter screen 4. The side wall of the cylindrical shell 7 near the first one-way valve 10 is connected to the second one-way valve 12 through the second conduit 11. The bottom of the tank 3 is connected to one end of the box 5 through the No. 3 conduit 13, and the No. 3 one-way valve 14 is provided on the No. 3 conduit 13. The plunger mechanism further includes a rotating shaft 15 and a rocker arm 16. The rotating shaft 15 is rotatably mounted on the base plate 1, and one end of the rocker arm 16 is fixedly connected to the rotating shaft 15. The other end of the swing arm 16 is rotatably connected to the piston 8 via a connecting rod 17, and a reduction motor 18 with its output end coaxially fixedly connected to one end of the rotating shaft 15 is provided on the base plate 1.

[0030] In this embodiment, please refer to Figure 3 , Figure 5 and Figure 7After the geared motor 18 starts, the rotating shaft 15 drives the rocker arm 16 to swing in a circular motion. The rocker arm 16 converts the rotational motion into the linear reciprocating motion of the piston 8 in the cylinder shell 7 through the connecting rod 17. When piston 8 is pulled outward, the volume of the inner cavity of the cylinder shell 7 increases and the pressure drops sharply. The first one-way valve 10 is opened by negative pressure, and the mixed solution in the decolorizing kettle 2 is drawn into the cylinder shell 7 through the first conduit 9. The second one-way valve 12 and the third one-way valve 14 remain closed because the pressure after the valve is higher than that before the valve, preventing the liquid in the tank 3 and the box 5 from flowing back. After piston 8 reaches its outer limit, it immediately pushes inward, reducing the volume of the inner cavity of the shell 7 and increasing the pressure. The first check valve 10 immediately closes, cutting off the connection with the decolorization kettle 2. When the pressure rises to a level greater than the static pressure of the liquid column in the tank 3, the second check valve 12 is opened, and the liquid in the shell 7 is forced into the tank 3 through the second conduit 11. Since the installation height of the second check valve 12 is higher than that of the filter screen 4, the liquid washes the filter screen 4 from top to bottom, the solid catalyst is trapped, and the initial filtrate accumulates at the bottom of the tank 3. As piston 8 continues to push inward, the liquid level at the bottom of tank 3 rises and the static pressure increases. When the static pressure of the liquid column exceeds the opening pressure difference of check valve 14, check valve 14 is opened, and the initial filtrate flows into tank 5 through pipe 13, waiting for ion filter membrane plate 6 to perform secondary purification. When piston 8 is pulled outward again, the negative pressure inside the cylinder shell 7 is restored, and the second one-way valve 12 and the third one-way valve 14 close in succession, starting the next pumping cycle. The alternating opening and closing of the first one-way valve 10, the second one-way valve 12 and the third one-way valve 14 ensures that the liquid always flows along the one-way path of "decolorizing kettle 2 - cylinder shell 7 - tank 3 - box 5" without cross-flow.

[0031] As a further embodiment of the present invention, the reciprocating assembly includes a transmission rod 19 and a rotating rod 20 respectively rotatably disposed on the substrate 1. The transmission rod 19 is parallel to the rotating shaft 15, and the length direction of the rotating rod 20 is parallel to the sliding direction of the ion filter membrane plate 6. A first sprocket 21 is provided on the rotating shaft 15, and a second sprocket 22 is provided on the transmission rod 19. The first sprocket 21 and the second sprocket 22 are connected by a chain 23. The transmission rod 19 is provided with a first bevel gear 24, and the rotating rod 20 is provided with a second bevel gear 25 that meshes with the first bevel gear 24. The reciprocating assembly also includes a slide rod 26 and a sleeve 27. One end of the slide rod 26 is fixedly connected to the ion filter membrane plate 6, and the other end extends to the outside of the housing 5. The sleeve 27 is coaxially slidably sleeved on the outer wall of the rotating rod 20. The inner wall of the sleeve 27 is fitted with a steel ball 28, and the outer wall of the rotating rod 20 is provided with an annular track groove 2001 along its length. The steel ball 28 is also fitted with the annular track groove 2001. The sleeve 27 and the slide rod 26 are fixedly connected by a crossbar 29.

[0032] In this embodiment, please refer to Figure 7 , Figure 9 and Figure 10 The operation starts with the rotation of the rotating shaft 15. Through chain drive, bevel gear reversal and the cooperation of the annular track groove 2001 and steel ball 28, the circular motion is finally converted into the linear reciprocating motion of the ion filter membrane plate 6. When the shaft 15 rotates, the first sprocket 21 on the same axis rotates synchronously, and the torque is transmitted in parallel to the second sprocket 22 through the chain 23, so that the transmission rod 19 rotates at the same speed and in the same direction as the shaft 15. The first bevel gear 24 on the transmission rod 19 will drive the rotating rod 20 to rotate through the second bevel gear 25. The outer wall of the rotating rod 20 has an annular track groove 2001. The steel ball 28 in the sleeve 27 is embedded in the annular track groove 2001. When the rotating rod 20 rotates, the spiral section of the annular track groove 2001 pushes the steel ball 28, forcing the sleeve 27 to move linearly along the axis of the rotating rod 20. The linear return section of the annular track groove 2001 causes the sleeve 27 to retract in the opposite direction when the rotating rod 20 continues to rotate. Thus, the sleeve 27 achieves periodic reciprocating linear motion under a single rotation input. The sleeve 27 is fixedly connected to the slide rod 26 via the crossbar 29. The other end of the slide rod 26 extends into the housing 5 and is fixed to the ion filter membrane plate 6. The reciprocating motion of the sleeve 27 directly drives the slide rod 26 and the ion filter membrane plate 6 to move forward and backward synchronously, completing the breathing action of "compressing the filter chamber - relaxing and resetting". This action is mechanically synchronized with the push-pull stroke of the plunger, without the need for additional power or control signals.

[0033] As a further embodiment of the present invention, the recycling component includes a collection pool 30, which is fixedly mounted on the substrate 1; The side wall of the box 5 away from the third one-way valve 14 is connected to the collection pool 30 through the fourth conduit 31, and the collection pool 30 is provided with a discharge valve 32.

[0034] In this embodiment, please refer to Figure 5 and Figure 6When the ion filter membrane 6 pushes the filtrate in the tank 5 toward the outlet end during its reciprocating stroke, the clean liquid phase passes through the membrane layer and gathers along the axis of the tank 5 toward the end away from the No. 3 one-way valve 14. The side wall of this end is connected to the collection tank 30 through the No. 4 conduit 31. Under the continuous compression of the ion filter membrane 6, the filtrate flows into the collection tank 30 and is temporarily stored. After a batch of filtration is completed or the liquid level in the collection tank 30 reaches the set height, the discharge valve 32 is opened to transfer the purified phenyl diisooctyl phosphite solution to the downstream process, completing the continuous and closed product collection.

[0035] A method for filtering out heterogeneous catalysts used in the preparation of phenyl diisooctyl phosphite using the above-described coupled filtration device, characterized by comprising the following steps: Step 1: Start the reduction motor to make the plunger mechanism enter the suction half cycle. The piston is pulled outward, and the negative pressure in the inner cavity of the cylinder opens the No. 1 one-way valve, which draws the mixed solution containing heterogeneous catalyst and ionic impurities in the decolorization kettle into the cylinder in one go, thus completing the raw material transfer. Step 2: The plunger mechanism switches to the pressure feeding half-cycle. The piston pushes inward, the pressure inside the cylinder increases, the first check valve closes, and the second check valve is opened first. The liquid flows into the tank from top to bottom through the second conduit. The filter screen traps the solid catalyst. When the liquid level at the bottom of the tank rises and the static pressure exceeds the opening pressure difference of the third check valve, the initial filtrate flows continuously into the tank through the third conduit, realizing the first-stage solid-liquid separation. Step 3: During the pressing process, the reciprocating assembly is driven by the same shaft. The sprocket and chain transmit the rotation to the transmission rod. After the bevel gear pair reverses the direction, the rotating rod rotates. The annular track groove and the steel ball cooperate to force the sleeve to make reciprocating linear motion. Through the slide rod, the ion filter membrane plate is driven to compress the filter chamber towards the liquid inlet, which promotes the liquid phase to pass through the membrane layer and intercepts ionic impurities. When the plunger is pulled out again, the membrane plate automatically resets and relaxes, and the concentration polarization layer on the membrane surface falls off, completing the self-cleaning secondary separation. Step 4: The clean filtrate passing through the membrane is continuously pushed towards the outlet of the chamber by the membrane plate, and flows into the collection tank through the No. 4 conduit for temporary storage. After one batch of filtration is completed or the liquid level reaches the set value, the discharge valve is opened to send the purified phenyl diisooctyl phosphite solution to the subsequent process. After the discharge valve is closed, the equipment immediately enters the next cycle.

[0036] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A coupled filtration apparatus for preparing a heterogeneous catalyst for phenyl diisooctyl phosphite, comprising a substrate (1) and a decolorizing vessel (2) and a tank (3) respectively disposed on the substrate (1), characterized in that, A plunger mechanism is provided on the substrate (1). The plunger mechanism is connected to the decolorizing kettle (2) and the tank (3) respectively. When the plunger mechanism is running, it can first extract the mixed solution from the decolorizing kettle (2) and then inject it into the tank (3). The tank (3) is equipped with a filter screen (4), and a box (5) is provided on the substrate (1). An ion filter membrane plate (6) is movably arranged inside the box (5). The tank (3) and the box (5) are connected. The mixed solution filtered by the filter screen (4) will enter the box (5). A reciprocating assembly is provided on the substrate (1). The reciprocating assembly is connected to the plunger mechanism and the ion filter membrane (6) respectively. During the process of the plunger mechanism pushing the mixed solution into the tank (3) and injecting the mixed solution into the box (5), the reciprocating assembly will drive the ion filter membrane (6) to move towards the mixed solution entry end of the box (5) to compress the space between the mixed solution and the ion filter membrane (6). When the plunger mechanism extracts the mixed solution in the decolorizing kettle (2), the ion filter membrane (6) will move back to its original position. A recycling component is also provided on the substrate (1), and the recycling component is in communication with the box (5).

2. The coupled filtration device for preparing heterogeneous catalysts for phenyl diisooctyl phosphite according to claim 1, characterized in that, The plunger mechanism includes a cylindrical shell (7) and a piston (8) that slides with the cylindrical shell (7), the cylindrical shell (7) being disposed on the base plate (1); The end of the cylindrical shell (7) away from the piston (8) is connected to the decolorizing kettle (2) through a first conduit (9), and a first one-way valve (10) is provided on the first conduit (9).

3. The coupled filtration device for preparing heterogeneous catalysts for phenyl diisooctyl phosphite according to claim 2, characterized in that, The side wall of the cylindrical shell (7) is provided with a second one-way valve (12). The horizontal height of the second one-way valve (12) is greater than the horizontal height of the filter screen (4). The side wall of the cylindrical shell (7) near the first one-way valve (10) is connected to the second one-way valve (12) through the second conduit (11). The bottom of the tank (3) is connected to one end of the box (5) through the No. 3 conduit (13), and the No. 3 one-way valve (14) is provided on the No. 3 conduit (13).

4. The coupled filtration device for preparing heterogeneous catalysts for phenyl diisooctyl phosphite according to claim 2, characterized in that, The plunger mechanism also includes a rotating shaft (15) and a rocker arm (16). The rotating shaft (15) is rotatably mounted on the base plate (1), and one end of the rocker arm (16) is fixedly connected to the rotating shaft (15). The other end of the swing arm (16) is rotatably connected to the piston (8) via a connecting rod (17), and a speed reduction motor (18) with its output end coaxially fixedly connected to one end of the rotating shaft (15) is provided on the base plate (1).

5. The coupled filtration device for preparing heterogeneous catalysts for phenyl diisooctyl phosphite according to claim 4, characterized in that, The reciprocating assembly includes a transmission rod (19) and a rotating rod (20) respectively rotatably mounted on the substrate (1). The transmission rod (19) is parallel to the rotating shaft (15), and the length direction of the rotating rod (20) is parallel to the sliding direction of the ion filter membrane plate (6).

6. The coupled filtration apparatus for preparing heterogeneous catalysts for phenyl diisooctyl phosphite according to claim 5, characterized in that, A first sprocket (21) is provided on the rotating shaft (15), and a second sprocket (22) is provided on the transmission rod (19). The first sprocket (21) and the second sprocket (22) are connected by a chain (23). The transmission rod (19) is provided with a first bevel gear (24), and the rotating rod (20) is provided with a second bevel gear (25) that meshes with the first bevel gear (24).

7. The coupled filtration device for preparing heterogeneous catalysts for phenyl diisooctyl phosphite according to claim 5, characterized in that, The reciprocating assembly also includes a slide rod (26) and a sleeve (27). One end of the slide rod (26) is fixedly connected to the ion filter membrane plate (6), and the other end extends to the outside of the housing (5). The sleeve (27) is coaxially slidably sleeved on the outer wall of the rotating rod (20). The inner wall of the sleeve (27) is fitted with a steel ball (28) rolling. The outer wall of the rotating rod (20) is provided with an annular track groove (2001) along its length. The steel ball (28) is also fitted with the annular track groove (2001) rolling. The sleeve (27) and the slide rod (26) are fixedly connected by a crossbar (29).

8. The coupled filtration device for preparing heterogeneous catalysts for phenyl diisooctyl phosphite according to claim 3, characterized in that, The recycling assembly includes a collection pool (30), which is fixedly mounted on the substrate (1); The side wall of the box (5) away from the third one-way valve (14) is connected to the collection pool (30) through the fourth conduit (31), and the collection pool (30) is provided with a discharge valve (32).

9. A method for filtering out heterogeneous catalysts used in the preparation of phenyl diisooctyl phosphite using the coupled filtration apparatus according to any one of claims 1-8, characterized in that, Includes the following steps: Step 1: Start the reduction motor to make the plunger mechanism enter the suction half cycle. The piston is pulled outward, and the negative pressure in the inner cavity of the cylinder opens the No. 1 one-way valve, which draws the mixed solution containing heterogeneous catalyst and ionic impurities in the decolorization kettle into the cylinder in one go, thus completing the raw material transfer. Step 2: The plunger mechanism switches to the pressure feeding half-cycle. The piston pushes inward, the pressure inside the cylinder increases, the first check valve closes, and the second check valve is opened first. The liquid flows into the tank from top to bottom through the second conduit. The filter screen traps the solid catalyst. When the liquid level at the bottom of the tank rises and the static pressure exceeds the opening pressure difference of the third check valve, the initial filtrate flows continuously into the tank through the third conduit, realizing the first-stage solid-liquid separation. Step 3: During the pressing process, the reciprocating assembly is driven by the same shaft. The sprocket and chain transmit the rotation to the transmission rod. After the bevel gear pair reverses the direction, the rotating rod rotates. The annular track groove and the steel ball cooperate to force the sleeve to make reciprocating linear motion. Through the slide rod, the ion filter membrane plate is driven to compress the filter chamber towards the liquid inlet, which promotes the liquid phase to pass through the membrane layer and intercepts ionic impurities. When the plunger is pulled out again, the membrane plate automatically resets and relaxes, and the concentration polarization layer on the membrane surface falls off, completing the self-cleaning secondary separation. Step 4: The clean filtrate passing through the membrane is continuously pushed towards the outlet of the chamber by the membrane plate, and flows into the collection tank through the No. 4 conduit for temporary storage. After one batch of filtration is completed or the liquid level reaches the set value, the discharge valve is opened to send the purified phenyl diisooctyl phosphite solution to the subsequent process. After the discharge valve is closed, the equipment immediately enters the next cycle.

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