Filter pressing device for inspecting and separating platinum-carbon catalyst particles from mixed liquid

Abstract

The utility model discloses a filter pressing device for inspecting and separating platinum-carbon catalyst particles from a mixed solution, and relates to a filter pressing device for solid-liquid separation. The utility model relates to a filter pressing device, in particular to a filter pressing device, which aims at solving the technical problem that the existing suction filtration device for separating platinum-carbon particles from a mixed solution and cleaning the platinum-carbon particles cannot meet the batch production of carbon-supported platinum catalysts, and comprises a plurality of filter pressing tanks which are connected in series and have the same structure, and stirrers, air pipes and filter paper are arranged in tank bodies of the filter pressing tanks; a discharge pipe with a conductivity meter and a communicating pipe are arranged at the bottom of the tank body, and a plurality of filter pressing tanks are connected in series through the communicating pipe. The device can be used for quickly carrying out solid / liquid separation, washing and detection on the platinum-carbon catalyst on a large scale, the washing is thorough, the water consumption is only one third of the water consumption of a single suction filtration device, and the device can be applied to the field of platinum-carbon catalyst preparation.

Description

Technical Field

[0001] The utility model relates to a filter press device for solid-liquid separation. Background Art

[0002] Carbon-supported platinum (Pt / C) catalyst is currently a widely used hydrogen fuel cell catalyst. Its preparation method is generally a polyol reduction method, in which carbon powder and platinum ion solution are dispersed in an organic solution. After microwave heating, the platinum ions are reduced to platinum nanoparticles and uniformly adsorbed on the carbon carrier to form platinum carbon particles. Subsequent treatment requires separating the platinum carbon particles from the mixed solution and washing the platinum carbon particles to remove the organic solvent. The commonly used laboratory-level filtration device can no longer meet the needs of mass production. The filter press with automatic solid particle washing function and automatic detection of washing effect can greatly speed up the experimental process and adapt to solid-liquid separation in mass production. Utility Model Content

[0003] The utility model solves the technical problem that the existing suction filtration device for separating and cleaning platinum carbon particles from a mixed liquid cannot meet the needs of mass production of carbon-supported platinum (Pt / C) catalysts, and provides a filter press device for testing and separating solid particles of platinum carbon catalysts from a mixed liquid. The device can quickly stir, wash, and separate solid particle catalysts in a solution in large quantities, and combine individual filter press tanks through a connecting pipe with a conductivity detector to achieve the purpose of continuous washing, changing the current situation of using a large amount of water, and is used for the solid-liquid separation process of washing and testing a large number of catalysts.

[0004] The utility model discloses a filter press device for testing and separating platinum-carbon catalyst particles from a mixed liquid, comprising a plurality of filter press tanks of the same structure connected in series, the filter press tanks comprising a tank body 1, a stirrer 2, an air pipe 3, a filter paper 4, a discharge pipe 5, a conductivity meter 6, and a connecting pipe 7;

[0005] The upper part of the tank body 1 of the filter press tank is cylindrical, and the bottom is conical. A stirrer 2 is arranged in the tank body 1, and a stirring motor 2-1 of the stirrer 2 is connected to a stirring paddle 2-3 through a stirring shaft 2-2; an air pipe 3 is arranged outside the stirring shaft 2-2, and the axes of the stirring shaft 2-2, the air pipe 3 and the tank body 1 coincide; an air inlet 3-1 and an air outlet 3-2 are arranged at the upper end of the air pipe 3, and an exhaust valve 3-3 is arranged at the front end of the air outlet 3-2;

[0006] A water inlet 1-1 is arranged on the upper part of the can body 1, a discharge pipe 5 is connected to the bottom of the can body 1, and a filter paper 4 is arranged on the conical bottom of the can body 1;

[0007] A branch pipe in parallel is arranged on the discharge pipe 5, and a conductivity meter 6 is installed on the branch pipe; a first stop valve 5-1 is arranged on the discharge pipe 5 in front of the branch pipe, and a discharge valve 5-2 is installed at the end of the discharge pipe 5; a second stop valve 6-1 is installed on the branch pipe in front of the conductivity meter 6, and a third stop valve 6-2 is installed on the branch pipe after the conductivity meter 6. A connecting pipe 7 is connected in front of the discharge valve 5-2 of the discharge pipe 5, and a fourth stop valve 7-1 is arranged on the connecting pipe 7. The connecting pipe 7 is connected to the water inlet 1-1 of the filter press tank at the rear through a quick connector.

[0008] Furthermore, a pressure gauge is provided on the upper part of the tank body 1, and the gauge pressure in the tank is not greater than 0.8 MPa;

[0009] Furthermore, the connection between the stirring shaft 2-2, the air pipe 3 and the tank body 1 is sealed with silicone rubber;

[0010] Furthermore, the gas outlet of the gas pipe 3 is lower than the liquid level in the tank. This arrangement not only produces a filter press effect, but also has the function of stirring the liquid material.

[0011] Furthermore, the tank body 1 is made of stainless steel to avoid introducing impurities into the catalyst.

[0012] Furthermore, the material of the stirring paddle 2-3 is polytetrafluoroethylene to avoid introducing impurities into the catalyst.

[0013] Furthermore, a bracket 8 is provided at the bottom of the tank body 1 of the filter press tank, and the bracket 8 supports the tank body 1 .

[0014] Furthermore, the number of filter press tanks is 2 to 5.

[0015] The method of using the filter press device for testing and separating platinum-carbon catalyst particles from a mixed liquid is as follows:

[0016] 1. Lay the filter paper 4 flat on the conical bottom of the can body 1, moisten it with water and fit it, assemble the upper cylindrical shape and the bottom conical shape into the whole can body 1, and fix it with sealing screws;

[0017] 2. The platinum-carbon catalyst mixed liquid after microwave reaction is respectively injected into the tank body 1 of each filter press tank of the filter press device through the water inlet 1-1, and the filter press operation is performed respectively. The filter press operation is specifically as follows: the stirrer 2 is turned on, and pure argon gas or air is introduced into the tank body 1 through the air inlet 3-1 of the air pipe 3, and the air flow is controlled to stabilize the air pressure gauge at 0.4-0.5MPa, and the filter press is started; the filtrate discharged from the discharge pipe 5 is discharged through the discharge valve 5-2 at the end of the discharge pipe 5, and the filtrate is collected for wastewater treatment;

[0018] 3. Deionized water is injected into the first filter press tank of the filter press device to perform the first filter press washing operation. The filter press operation is specifically as follows: the stirrer 2 is turned on, and pure argon or air is introduced into the tank body 1 through the air inlet 3-1 of the air pipe 3, and the air flow is controlled to stabilize the pressure gauge at 0.4-0.5MPa, and the filter press is started; the conductivity of the filtrate obtained by the filter press is tested by the conductivity meter 6;

[0019] If the conductivity σ of the filtrate is ≥ 0.2 mS / cm, close the fourth stop valve 7-1 on the connecting pipe 7, open the discharge valve 5-2 at the end of the discharge pipe 5, and collect the filtrate for wastewater treatment;

[0020] If the conductivity of the filtrate is 0.05≤σ<0.2mS / cm, the discharge valve 5-2 at the end of the discharge pipe 5 is closed, the fourth stop valve 7-1 on the connecting pipe 7 is opened, and the filtrate is injected into the second filter press tank for the first filter press washing of the catalyst in the second filter press tank;

[0021] If the conductivity of the filtrate is 0.02≤σ<0.05mS / cm, the filtrate is used for the second filter press tank for the second washing;

[0022] If the conductivity of the filtrate is less than 0.02 mS / cm, the platinum-carbon catalyst in the filter press tank is washed completely; the remaining liquid in the first filter press tank is filtered out, the washing is completed, and the filter cake is taken out for subsequent treatment;

[0023] 4. Carry out the operation of step 3 on the second filter press tank to complete the washing of the catalyst in the second filter press tank; and so on, until the washing of the catalyst in all the filter press tanks is completed.

[0024] The device of the utility model is a filter press device that can quickly perform solid / liquid separation, washing, and testing in large quantities. The filter press device can stir and clean while filtering, so that the prepared catalyst can be fully washed; the design of the conical bottom can make the micro-nano particles filtered on the filter paper concentrate at the bottom instead of being evenly spread on the surface of the filter paper, compared with the original flat bottom, so that the resistance of the filter press process is smaller, the filter press speed is greatly improved, and the cleaning and separation are integrated, and the catalyst can be fully cleaned. At the same time, a connecting device with conductivity detection of the washed filtrate is designed. On the basis of multiple washing and utilization of water, the conductivity of the filtrate of the previous filter press tank is detected. The filtrate that meets the conductivity standard can be used in the washing process of the next separation tank to achieve the purpose of water saving.

[0025] The reduced platinum carbon particles can be washed and separated from the organic solution for subsequent treatment. After the operation of the front filter press tank is completed, the filter press tanks behind are sequentially promoted, and new untreated filter press tanks are added at the end to form an assembly line operation, which meets the needs of large-scale preparation and has a good washing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of a filter press device for testing and separating platinum-carbon catalyst particles from a mixed liquid;

[0027] Figure 2 It is a structural schematic diagram of the filter press tank;

[0028] Figure 3 It is a schematic diagram of the structure of the agitator 2 and the air pipe 3; DETAILED DESCRIPTION

[0029] The beneficial effects of the present invention are verified by the following examples.

[0030] Embodiment 1: The filter press device for testing and separating platinum-carbon catalyst particles from a mixed liquid of the utility model comprises four filter press tanks of the same structure connected in series, each filter press tank comprising a tank body 1, an agitator 2, an air pipe 3, a filter paper 4, a discharge pipe 5, a conductivity meter 6, a connecting pipe 7, and a bracket 8;

[0031] The upper part of the stainless steel tank body 1 of the filter press tank is cylindrical, and the bottom is conical. The bracket 8 supports the tank body 1. The stirrer 2 is arranged in the tank body 1. The stirring motor 2-1 of the stirrer 2 is connected to the polytetrafluoroethylene stirring paddle 2-3 through the stirring shaft 2-2; the air pipe 3 is arranged outside the stirring shaft 2-2, and the axes of the stirring shaft 2-2, the air pipe 3 and the tank body 1 coincide; the upper end of the air pipe 3 is provided with an air inlet 3-1 and an air outlet 3-2, and an exhaust valve 3-3 is arranged at the front end of the air outlet 3-2;

[0032] A water inlet 1-1 is arranged on the upper part of the can body 1, a pressure gauge is also arranged on the upper part of the can body 1, a discharge pipe 5 is connected to the bottom of the can body 1, and a filter paper 4 is arranged on the conical bottom of the can body 1;

[0033] A branch pipe in parallel is arranged on the discharge pipe 5, and a conductivity meter 6 is installed on the branch pipe; a first stop valve 5-1 is arranged on the discharge pipe 5 in front of the branch pipe, and a discharge valve 5-2 is installed at the end of the discharge pipe 5; a second stop valve 6-1 is installed on the branch pipe in front of the conductivity meter 6, and a third stop valve 6-2 is installed on the branch pipe after the conductivity meter 6. A connecting pipe 7 is connected in front of the discharge valve 5-2 of the discharge pipe 5, and a fourth stop valve 7-1 is arranged on the connecting pipe 7. The connecting pipe 7 is connected to the water inlet 1-1 of the filter press tank at the rear through a quick connector.

[0034] The method for testing and separating the platinum-carbon catalyst particles from the mixed liquid using the filter press device of this embodiment 1 is as follows:

[0035] 1. Lay the filter paper 4 flat on the conical bottom of the four filter press tanks 1, moisten them with water and fit them together, assemble the upper cylindrical shape and the bottom conical shape into a whole tank body 1, and fix them with sealing screws; number the four filter press tanks No. 1, No. 2, No. 3, and No. 4 respectively;

[0036] 2. The platinum-carbon catalyst mixture after microwave reduction is injected into the tank body 1 of each filter press tank from the water inlet 1-1, and the filter press operation is performed respectively; the filtrate discharged from the discharge pipe 5 is discharged from the discharge valve 5-2 at the end of the discharge pipe 5, and the filtrate is collected for wastewater treatment;

[0037] 3. (1) Deionized water is injected into filter press tank No. 1 to perform the first filter press washing operation; the conductivity of the filtrate obtained by the filter press is tested by a conductivity meter 6; if the conductivity result is 0.25 mS / cm (>0.2 mS / cm), the fourth stop valve 7-1 on the connecting pipe 7 is closed, and the discharge valve 5-2 at the end of the discharge pipe 5 is opened to collect the filtrate for wastewater treatment;

[0038] (2) Deionized water is injected into the filter press tank No. 1 to perform a second filter press washing operation; the conductivity of the filtrate obtained by the filter press is tested by the conductivity meter 6; the conductivity result is 0.11 mS / cm (<0.2 mS / cm), the discharge valve 5-2 at the end of the discharge pipe 5 is closed, the fourth stop valve 7-1 on the connecting pipe 7 is opened, and the filtrate is injected into the filter press tank No. 2 to perform the first filter press washing;

[0039] The catalyst in the filter press tank No. 2 is subjected to filter press operation; the conductivity of the filtrate filtered out of the filter press tank No. 2 is tested by the conductivity meter 6; if the conductivity result is 0.8 mS / cm, the fourth stop valve 7-1 on the connecting pipe 7 is closed, and the discharge valve 5-2 at the end of the discharge pipe 5 is opened to collect the filtrate filtered out of the filter press tank No. 2 for wastewater treatment;

[0040] (3) Deionized water is injected into the filter press tank No. 1 to perform filter press operation; the conductivity of the filtrate obtained by filter press is tested by the conductivity meter 6; the conductivity result is 0.014 mS / cm (<0.02 mS / cm), and the washing is qualified. The discharge valve 5-2 at the end of the discharge pipe 5 is closed, and the fourth stop valve 7-1 on the connecting pipe 7 is opened, and the filtrate is injected into the filter press tank No. 2 for a second washing;

[0041] The catalyst in the No. 2 filter press tank is subjected to a second filter press operation; the conductivity of the filtrate obtained by the filter press is tested by a conductivity meter 6; the conductivity result is 0.024 mS / cm, the discharge valve 5-2 at the end of the discharge pipe 5 is closed, the fourth stop valve 7-1 on the connecting pipe 7 is opened, and the filtrate is injected into the No. 3 filter press tank;

[0042] Perform filter pressing operation on filter press tank No. 3; the conductivity of the filtrate obtained by filter pressing is tested by conductivity meter 6; if the conductivity result is 0.6 mS / cm, the fourth stop valve 7-1 on the connecting pipe 7 is closed, the discharge valve 5-2 at the end of the discharge pipe 5 is opened, and the filtrate is collected for wastewater treatment;

[0043] (4) taking out the washed catalyst in the No. 1 filter press tank, and adding the microwave-reduced platinum-carbon catalyst mixture to be washed;

[0044] 4. Upgrade the numbers of filter press tanks No. 2, 3, and 4 to new No. 1, No. 2, and No. 3 respectively; change the number of the filter press tank originally numbered No. 1 to No. 4, repeat the operation of step three, and continuously wash the platinum-carbon catalyst.

[0045] The filter pressing operations described in steps 2 and 3 are specifically as follows: start the agitator 2, then introduce pure argon gas into the tank body 1 through the air inlet 3-1 of the air pipe 3, and control the air flow to stabilize the pressure gauge at 0.5 MPa to start the filter pressing.

[0046] In the device of this embodiment, the bottom of the filter press tank is conical. If the bottom of the filter press tank is flat, the micro-nano solid particles in the liquid will settle relatively evenly on the flat filter paper, and these particles will seriously hinder its filtration speed. When the bottom of the filter tank is conical, the tiny particles in the liquid will preferentially settle at the bottom of the cone when they settle, and the middle or upper part of the cone is rarely covered by particles, so the filtration speed is little affected.

[0047] In the device of this embodiment, a stirrer is arranged in the filter press tank. If there is no stirring, the washing solvent (water) will contact the particles transiently, and the washing effect will be poor. After adding the stirrer, the solvent and the particles can be fully contacted, which greatly improves the washing efficiency; at the same time, when stirring, part of the particles are suspended in the liquid, which reduces the particles on the bottom filter paper, reduces the filtration resistance, and can greatly speed up the filtration speed.

[0048] The device of this embodiment can reuse water multiple times. The tanks are combined through a connecting pipe with a detection device, so that one water can be used for multiple washings, which greatly changes the current situation of excessive water use and saves two-thirds of the water consumption compared to single tank cleaning.

[0049] The device of this embodiment determines whether the washing is clean by the conductivity of the filtrate to ensure that the catalyst is fully washed. After the standard is met, the next tank is subjected to filter pressing washing test to ensure that each tank is washed to the standard.

Claims

1. A filter press device for testing and separating platinum-carbon catalyst particles from a mixed liquid, It is characterized in that The device comprises a plurality of filter press tanks of the same structure connected in series, wherein the filter press tanks comprise a tank body (1), a stirrer (2), an air pipe (3), filter paper (4), a discharge pipe (5), a conductivity meter (6), and a connecting pipe (7); The upper part of the tank body (1) of the filter press tank is cylindrical, and the bottom is conical. A stirrer (2) is arranged inside the tank body (1), and a stirring motor (2-1) of the stirrer (2) is connected to a stirring paddle (2-3) via a stirring shaft (2-2); an air pipe (3) is arranged outside the stirring shaft (2-2), and the axes of the stirring shaft (2-2), the air pipe (3) and the tank body (1) coincide; an air inlet (3-1) and an air outlet (3-2) are arranged at the upper end of the air pipe (3), and an exhaust valve (3-3) is arranged at the front end of the air outlet (3-2); A water inlet (1-1) is arranged on the upper part of the can body (1), the bottom of the can body (1) is connected to a discharge pipe (5), and a filter paper (4) is arranged on the conical bottom of the can body (1); A branch pipe connected in parallel is arranged on the discharge pipe (5), and a conductivity meter (6) is installed on the branch pipe; a first stop valve (5-1) is arranged on the discharge pipe (5) in front of the branch pipe, and a discharge valve (5-2) is installed at the end of the discharge pipe (5); a second stop valve (6-1) is installed on the branch pipe in front of the conductivity meter (6), and a third stop valve (6-2) is installed on the branch pipe after the conductivity meter (6); a connecting pipe (7) is connected in front of the discharge valve (5-2) of the discharge pipe (5), and a fourth stop valve (7-1) is arranged on the connecting pipe (7); the connecting pipe (7) is connected to a water inlet (1-1) of a filter press tank at the rear through a quick-connect joint.

2. A filter press device for separating platinum-carbon catalyst particles from a mixed liquid according to claim 1, It is characterized in that A pressure gauge is also provided on the upper part of the tank body (1).

3. A filter press device for testing and separating platinum-carbon catalyst particles from a mixed liquid according to claim 1 or 2, It is characterized in that The connection between the stirring shaft (2-2), the air pipe (3) and the tank body (1) is sealed with silicone rubber.

4. A filter press device for separating platinum-carbon catalyst particles from a mixed liquid according to claim 1 or 2, It is characterized in that The material of the tank body (1) is stainless steel.

5. A filter press device for separating platinum-carbon catalyst particles from a mixed liquid according to claim 1 or 2, It is characterized in that The material of the stirring paddle (2-3) is polytetrafluoroethylene.

6. A filter press device for separating platinum-carbon catalyst particles from a mixed liquid according to claim 1 or 2, It is characterized in that A support (8) is also provided at the bottom of the tank body (1) of the filter press tank, and the support (8) supports the tank body (1).

7. A filter press device for separating platinum-carbon catalyst particles from a mixed liquid according to claim 1 or 2, It is characterized in that The number of filter press tanks is 2 to 5.

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