Device for stably storing sodium hydroxide leacheate stock solution

Abstract

The utility model discloses a device for stably storing sodium hydroxide leacheate stock solution. Wherein the storage tank is placed on a table top, the top of the storage tank is provided with a sealing cover, the sealing cover is provided with an air hole and two air path connectors, an air hole pipe is fixed in the air hole and keeps sealing, one air path connector is connected with a nitrogen source through a pipe nitrogen pressure dividing valve, and the other air path connector is connected with a pressure dividing valve. And the partial pressure valve is fixed in a valve mounting port of the partial pressure valve frame. By arranging the pressure dividing valve and the air hole pipe, air can be exhausted from the storage tank, high-purity nitrogen can be injected into the storage tank, the liquid sodium hydroxide stock solution is isolated from carbon dioxide in the air, and the purity of the liquid sodium hydroxide stock solution is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of storage containers, in particular to a device for stably storing a sodium hydroxide eluent reserve solution. Background Art

[0002] The solubility of sodium hydroxide at room temperature is 53g. The hydroxide is prepared into a solution with a mass concentration of 50% and stored as a stock solution of the ion chromatograph eluent. In commercially available ion chromatographs, the sodium hydroxide eluent test concentration is mostly recommended to be 20mmol / L and 35mmol / L. It is diluted to the corresponding concentration with a sodium hydroxide solution with a mass concentration of 50%. The measured volumes are about 2.1mL and 3.6mL respectively, and the measured volumes are both small.

[0003] In view of the large amount of heat released during the dissolution of sodium hydroxide and the long waiting time for preparation, it is time-consuming and labor-intensive to prepare it immediately when needed. If too much is prepared during the storage process, it is easy to react with carbon dioxide in the air to form carbonates, causing changes in the concentration and purity of the sodium hydroxide in the stock solution. Using this stock solution to prepare eluent for ion chromatography anion detection will cause changes in the eluent concentration and the presence of carbonate impurities in the eluent. Carbonate may interfere with the test of nitrate and sulfate, and changes in the eluent concentration will affect the retention time offset of the target ion, causing inconvenience to batch data processing. Utility Model Content

[0004] In view of the problems existing in the background technology, the utility model provides a device for stably storing a sodium hydroxide eluent reserve solution, comprising: a storage tank, a sealing cover, a pressure dividing valve, an air hole tube, an air path interface, a pressure dividing valve rack and a nitrogen pressure dividing valve, wherein the storage tank is placed on a desktop, a sealing cover is installed on the top of the storage tank, an air hole and two air path interfaces are provided on the sealing cover, an air hole is fixed with an air hole tube and kept sealed, one air path interface is connected to a nitrogen pressure dividing valve and a nitrogen source through a pipe, the other air path interface is connected to the pressure dividing valve, and the pressure dividing valve is fixed in the valve mounting port of the pressure dividing valve rack.

[0005] The nitrogen partial pressure valve and the desktop are installed on the wall.

[0006] The pressure-dividing valve frame includes: a frame fixing plate, a frame U-shaped portion and a frame tail balancing plate, wherein one end of the frame fixing plate, which is a rectangular plate in a top view, is fixed integrally to the inner side of the frame U-shaped portion, and the other end of the frame fixing plate is fixed integrally to the frame tail balancing plate, and a valve mounting port is provided on the outer side of the frame U-shaped portion.

[0007] A bottle mouth mounting hole is provided in the center of the frame fixing plate, and the diameter of the bottle mouth mounting hole is slightly larger than the bottle mouth of the storage tank, so that the frame fixing plate can pass through the bottle mouth of the storage tank and be placed on the tank body of the storage tank.

[0008] The storage tank is a high pressure resistant plastic bottle.

[0009] The range of the pressure divider valve is 0-15 psi.

[0010] The air hole tube is in the shape of a cylinder with a diameter of 1.5 cm and a height of 2 cm. The upper part of the air hole tube is provided with a screwable cover.

[0011] The nitrogen is high-purity nitrogen.

[0012] The frame tail balance plate and the frame fixing plate form an angle of 90 degrees.

[0013] The beneficial effects of the utility model are:

[0014] 1. By setting the storage tank as a high-pressure resistant plastic bottle, it can be ensured that the liquid sodium hydroxide reserve solution stored in the tank does not react with the container, thereby ensuring the purity of the liquid sodium hydroxide reserve solution.

[0015] 2. By setting up a pressure reducing valve and an air hole tube, the air can be exhausted into the storage tank and high-purity nitrogen can be injected to isolate the liquid sodium hydroxide reserve solution from contact with carbon dioxide in the air, thereby ensuring the purity of the liquid sodium hydroxide reserve solution.

[0016] 3. Through the air hole tube, the diameter is 1.5cm, which is larger than the diameter of the graduated pipette. The cover on the air hole can be opened, and the pipette can be inserted into the storage tank. An appropriate volume of liquid sodium hydroxide reserve solution can be measured to prepare the eluent of corresponding concentration. During the preparation process, the liquid sodium hydroxide reserve solution is prevented from contacting with the air as much as possible to extend the storage time of the reserve solution.

[0017] 4. By setting the pressure divider valve, the pressure of the pressure divider valve is stabilized between 3-6psi, the nitrogen consumption is less, and the cost is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view schematic diagram of an embodiment of a device for stably storing a sodium hydroxide eluent reserve solution of the utility model;

[0019] Figure 2 A side view schematic diagram of an embodiment of the utility model;

[0020] Figure 3 It is a top view schematic diagram of an embodiment of the utility model;

[0021] Figure 4 It is a schematic top view of an embodiment of the utility model near the sealing cover.

[0022] Among them: 1. Storage tank; 2. Sealing cover; 3. Pressure dividing valve; 4. Air hole tube; 5. Air path interface; 6. Pressure dividing valve rack; 7. Nitrogen pressure dividing valve; 8. Wall; 9. Desktop; 61. Rack fixing plate; 62. Rack U-shaped part; 63. Rack tail balance plate; 611. Bottle mouth installation hole; 621. Valve installation port. DETAILED DESCRIPTION

[0023] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0024] like Figure 1 to Figure 4 The embodiment of the utility model shown includes: a storage tank 1, a sealing cover 2, a pressure dividing valve 3, an air hole tube 4, an air circuit interface 5, a pressure dividing valve rack 6 and a nitrogen pressure dividing valve 7, wherein the storage tank 1 is placed on a desktop 9, a sealing cover 2 is installed on the top of the storage tank 1, an air hole and two air circuit interfaces are provided on the sealing cover 2, an air hole is fixed with an air hole tube 4 and kept sealed, one air circuit interface 5 is connected to a nitrogen source through a nitrogen pressure dividing valve 7, another air circuit interface 5 is connected to the pressure dividing valve 3, the pressure dividing valve 3 is fixed in the valve installation port 621 of the pressure dividing valve rack 6, the nitrogen pressure dividing valve 7 and the desktop 9 are both installed on the wall 8; liquid sodium hydroxide reserve solution is stored in the storage tank 1.

[0025] As a preferred technical solution of the utility model, the storage tank is a high-pressure resistant plastic bottle.

[0026] As a preferred technical solution of the utility model, the range of the pressure dividing valve is 0-15psi.

[0027] As a preferred technical solution of the utility model, the air hole tube 4 is in the shape of a cylinder with a diameter of 1.5 cm and a height of 2 cm. The upper part of the air hole tube 4 is provided with a screwable cover.

[0028] As a preferred technical solution of the present invention, the nitrogen is high-purity nitrogen.

[0029] like Figure 1 to Figure 4 The pressure-dividing valve frame 6 shown in the figure comprises: a frame fixing plate 61, a frame U-shaped portion 62 and a frame tail balancing plate 63, wherein one end of the frame fixing plate 61 which is a rectangular plate in a plan view is integrally fixed to the inner side of the frame U-shaped portion 62, and the other end of the frame fixing plate 61 is integrally fixed to the frame tail balancing plate 63, and a valve installation port 621 is provided on the outer side of the frame U-shaped portion 62;

[0030] A bottle mouth mounting hole 611 is opened in the center of the frame fixing plate 61, and the aperture of the bottle mouth mounting hole 611 is slightly larger than the bottle mouth of the storage tank, so that the frame fixing plate 61 can pass through the bottle mouth of the storage tank and be placed on the tank body of the storage tank and can rotate.

[0031] As a preferred technical solution of the present utility model, the frame tail balance plate 63 and the frame fixing plate 61 form an angle of 90 degrees.

[0032] During operation, after the preparer pours the freshly prepared liquid sodium hydroxide stock solution into the sealed tank 1, he quickly covers the sealed cover 2, adjusts the pressure dividing valve 3, opens the vent tube 4, injects the nitrogen in the nitrogen bottle 5 into the storage tank 1, and at the same time, the air is discharged from the vent tube 4, and then closes the vent tube 4 to stabilize the pressure of the pressure dividing valve 3 between 3-6psi.

[0033] When the tester needs to prepare the eluent, he opens the pore tube 4, inserts the pipette into the pore tube 4, transfers the corresponding volume of the liquid sodium hydroxide reserve solution, and then increases the pressure of the pressure divider valve 3 for more than 10 seconds, and then closes the pore tube 4 to stabilize the pressure of the pressure divider valve 3 between 3-6psi. It is ensured that even during the process, air is avoided from contacting the liquid sodium hydroxide reserve solution as much as possible, the purity of the liquid sodium hydroxide reserve solution is ensured, and the reserve time is extended. At the same time, the purity of the liquid sodium hydroxide reserve solution is unchanged, and the concentration is also ensured. The concentration of the prepared eluent is also ensured to be unchanged, avoiding the shift of the retention time of the target ion caused by the change of the eluent concentration in continuous batch testing, improving the test efficiency, and saving time and material costs.

Claims

1. A device for stably storing a sodium hydroxide eluent reserve solution, characterized in that: include: A storage tank (1), a sealing cover (2), a pressure dividing valve (3), an air hole tube (4), an air path interface (5), a pressure dividing valve frame (6) and a nitrogen pressure dividing valve (7), wherein the storage tank (1) is placed on a table (9), a sealing cover (2) is installed on the top of the storage tank (1), an air hole and two air path interfaces are provided on the sealing cover (2), an air hole is fixed with an air hole tube (4) and is kept sealed, one air path interface (5) is connected to a nitrogen pressure dividing valve (7) and a nitrogen source through a pipe, the other air path interface (5) is connected to the pressure dividing valve (3), and the pressure dividing valve (3) is fixed in a valve installation port (621) of the pressure dividing valve frame (6).

2. A device for stably storing a sodium hydroxide eluent storage solution according to claim 1, characterized in that: The nitrogen partial pressure valve (7) and the table top (9) are installed on the wall (8).

3. A device for stably storing a sodium hydroxide eluent storage solution according to claim 1, characterized in that: The pressure-dividing valve frame (6) comprises: a frame fixing plate (61), a frame U-shaped portion (62) and a frame tail balancing plate (63), wherein one end of the frame fixing plate (61) which is in the shape of a rectangular plate in a plan view is integrally fixed to the inner side of the frame U-shaped portion (62), and the other end of the frame fixing plate (61) is integrally fixed to the frame tail balancing plate (63), and a valve installation port (621) is provided on the outer side of the frame U-shaped portion (62).

4. A device for stably storing a sodium hydroxide eluent storage solution according to claim 3, characterized in that: A bottle mouth mounting hole (611) is formed in the center of the frame fixing plate (61), and the diameter of the bottle mouth mounting hole (611) is slightly larger than the bottle mouth of the storage tank, so that the frame fixing plate (61) can pass through the bottle mouth of the storage tank and be placed on the tank body of the storage tank.

5. A device for stably storing a sodium hydroxide eluent storage solution according to claim 1, characterized in that: The storage tank is a high pressure resistant plastic bottle.

6. A device for stably storing a sodium hydroxide eluent storage solution according to claim 1, characterized in that: The range of the pressure divider valve is 0-15 psi.

7. A device for stably storing a sodium hydroxide eluent reserve solution according to claim 1, characterized in that: The air hole tube (4) is in the shape of a cylinder with a diameter of 1.5 cm and a height of 2 cm. The upper part of the air hole tube (4) is provided with a screwable cover.

8. A device for stably storing a sodium hydroxide eluent reserve solution according to claim 1, characterized in that: The nitrogen is high-purity nitrogen.

9. A device for stably storing a sodium hydroxide eluent storage solution according to claim 3, characterized in that: The frame tail balance plate (63) and the frame fixing plate (61) form an angle of 90 degrees.

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