Chemical solution storage tank

Abstract

To provide a chemical storage tank that is simple and inexpensive to construct, yet can adequately maintain the properties of the chemical solution. [Solution] A chemical storage tank comprising a chemical tank 1 for containing a separable chemical solution, a bubble discharge unit 2 for discharging bubbles into the chemical tank 1 to agitate the chemical solution, a gas supply means 3 for supplying gas to the bubble discharge unit 2, and a chemical injection means 4. The gas supply means 3 comprises a tube 6, a pressure regulating device 7, and a solenoid valve 8. The chemical injection means 4 comprises a suction pipe 11, a tube 12, and a chemical injection pump 13.

Description

Technical Field

[0006] , , , , , , , ,

[0005] ,

[0007] ,

[0001] The present invention relates to a storage tank for chemical solutions, and particularly to a storage tank for chemical solutions suitable for storing chemical solutions with separation properties such as emulsions.

Background Art

[0002] As an example of a chemical with separation properties used in the water treatment field, in the boiler water treatment field, a corrosion inhibitor having both a film-forming function and a neutralization function is used. These chemicals have been continuously developed in view of the ability to be stably stored for a long time even in an environment with a relatively high temperature such as in a boiler room, and the ease of manufacturing in one batch.

[0003] In recent years, with the update of the maximum temperature due to global warming, there have been cases where the chemical solution is applied under conditions where the stability of the chemical solution is slightly inferior, such as exceeding the design temperature which is the chemical specification, and a method for maintaining the non-separation into multiple layers in the chemical tank is required.

[0004] Patent Document 1 describes a chemical solution tank equipped with a propeller-type stirring blade and a chemical solution injection device using this chemical solution tank.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the storage tank of a mechanical stirring propeller for chemical solutions, a considerable economic cost and installation space are required, so it is required to be labor-saving and have a simple and inexpensive configuration.

[0007] This invention has been made in view of the above-mentioned conventional circumstances, and aims to provide a chemical storage tank that is simple in structure and inexpensive, while being able to sufficiently maintain the properties of the chemical solution. [Means for solving the problem]

[0008] As a result of diligent research to solve the above problems, the inventors have found that by stirring the emulsion by raising bubbles from the bottom of a chemical tank containing separable chemicals, such as emulsion-like substances, the emulsion state can be maintained even in environments where emulsification is easily broken down, such as high / low temperatures and dilution conditions.

[0009] This invention is based on the aforementioned findings and is summarized as follows.

[0010] [1] A tank for containing a separable chemical solution, The tank includes a bubble dispensing unit for discharging bubbles into the tank to agitate the chemical solution, A chemical solution storage tank having a gas supply means for supplying gas to the bubble discharge section.

[0011] [2] A chemical storage tank of the chemical solution [1] having a chemical injection means for injecting the chemical solution in the chemical solution tank.

[0012] [3] A chemical solution storage tank according to [2], characterized in that the chemical solution intake portion of the chemical injection means is located below the bubble discharge portion, or is located at a distance from the bubble discharge portion so that bubbles from the bubble discharge portion are not taken into the chemical injection means.

[0013] [4] A storage tank for any of the [1] to [3] emulsion-type chemicals. [Effects of the Invention]

[0014] According to the present invention, even chemical solutions that are prone to separation can maintain their properties over a long period of time. The chemical solution storage tank of the present invention has a simple structure, and requires only a small space for the installation of the stirring mechanism. Furthermore, it is easy to add the stirring mechanism separately later.

Brief Description of the Drawings

[0015] [Figure 1] It is a configuration diagram of a chemical liquid storage tank according to an embodiment.

Modes for Carrying Out the Invention

[0016] Hereinafter, an embodiment will be described with reference to FIG. 1. In FIG. 1, the inside of the tank is shown in a perspective view. However, in order to block external light, the tank may preferably be made of an opaque material.

[0017] This chemical liquid storage tank, as shown in FIG. 1, includes a chemical liquid tank 1, a pipe-shaped bubble discharge part 2 for discharging bubbles into the chemical liquid tank 1, a gas supply means 3 for supplying gas (air in this embodiment) to the bubble discharge part 2, a chemical liquid injection means 4 for supplying the chemical liquid in the chemical liquid tank 1 to the object to be injected, and the like.

[0018] In this embodiment, the chemical liquid tank 1 is provided with a lid member 1a. An air outflow hole (not shown) is provided in the lid member 1a. [[ID=2,3]]

[0019] The bubble discharge part 2 penetrates through the lid member 1a and is inserted into the chemical liquid tank 1. The lower end of the bubble discharge part 2 is located in the lower part of the chemical liquid tank 1, and small holes for discharging bubbles are opened on the lower end surface and / or side surface thereof.

[0020] The gas supply means 3 includes a tube 6 through which air is supplied from an air supply source (not shown) in the factory, and a pressure regulating device (for example, a valve) 7 and a solenoid valve 8 provided in the middle of the tube 6. The opening and closing of the solenoid valve 8 are controlled by a timer 9.

[0021] The chemical liquid injection means 4 includes a suction tube 11 that penetrates through the lid member 1a and is inserted into the chemical liquid tank 1, a chemical liquid injection tube 12 connected to the suction tube 11, a chemical liquid injection pump 13 provided in the middle of the tube 12, and the like.

[0022] The lower end of the suction pipe 11 is positioned lower than the lower end of the bubble discharge part 2 so that the bubbles from the bubble discharge part 2 are not sucked into the suction pipe 11.

[0023] In this embodiment, the chemical liquid tank 1 is cylindrical, and both the bubble discharge part 2 and the suction pipe 11 are inserted downward from near the center of the lid member 1a, but it is not limited thereto. Also, the bubble discharge part 2 and the suction pipe 11 may be arranged sufficiently separated from each other. When the bubble discharge part 2 and the suction pipe 11 are separated, the lower end of the suction pipe 11 may be positioned slightly higher than the lower end of the bubble discharge part 2.

[0024] The chemical liquid tank 1 may have a shape other than cylindrical.

[0025] In this embodiment, bubbles are discharged from the small hole-shaped opening at the lower end of the pipe-shaped bubble discharge part 2. This small hole-shaped opening may be one or a plurality. Instead of the small holes, slits may be provided. The small holes or slits may be provided so that the bubbles are discharged in all directions.

[0026] Note that instead of the bubble discharge part 2, bubble discharge holes may be provided on the side wall surface or the bottom surface of the chemical liquid tank 1, but since the structure becomes complicated, it is preferable to use the pipe-shaped bubble discharge part 2.

[0027] Also, the chemical injection means 4 includes the suction pipe 11, but an outlet may be provided on the side wall surface or the bottom surface of the chemical liquid tank 1, and a chemical injection tube may be connected to the outlet. However, when using the suction pipe, since the outlet is not required, the structure becomes simple.

[0028] This storage tank for the chemical liquid blows gas from the bubble discharge part 2 into the chemical liquid in the chemical liquid tank 1 to stir the chemical liquid, so that even for a chemical liquid with separability, the properties are maintained constantly.

[0029] While gas for stirring may be continuously injected into the bubble discharge section 2 for 24 hours a day, discontinuous injection is preferable in some cases to ensure the stability of the chemicals. For example, if the chemical solution contains components that absorb carbon dioxide and increase in viscosity, such as neutralizing amines, air stirring for about 10 minutes a day is preferable. In some cases, an inert gas such as nitrogen that does not contain carbon dioxide may be more preferable.

[0030] For the discontinuous gas injection described above, setting a timer is preferable. In addition, in conjunction with a thermostat, stirring may be performed every 10 minutes per day when the emulsion is in an unstable temperature range, for example, below 35°C for 24 hours.

[0031] In addition, the concentration of the active ingredient in the chemical solution tank may be measured at the top and bottom, and the aeration rate and time may be adjusted based on the results.

[0032] Examples of chemicals that exhibit separation properties include boiler water treatment chemicals, which consist of combinations such as "film-forming substance, neutralizing amine, and pure water as a solvent," as well as "film-forming substance and pure water as a solvent."

[0033] If the emulsion-type chemical is prone to foaming, in addition to minimizing the aeration time, the aeration time may also be adjusted in conjunction with a liquid level sensor or foaming sensor.

[0034] For emulsion-type chemicals, an O / W (Oil-in-Water) type is preferred. In this case, the particle size (D50) is preferably 0.01 to 15 μm, and more preferably 0.02 to 10 μm. If the particle size is too small, stability due to temperature changes will be poor, and if it is too large, creaming and gel-like substances are likely to form. [Examples]

[0035] [Example 1] In the chemical storage tank shown in Figure 1, the specifications of the chemical tank were as follows. 70 L of the following chemical was placed in chemical tank 1 and set up in a constant temperature room at 40°C. Then, air was blown in and the mixture was stirred under the following conditions, and its properties were observed over time.

[0036] <Chemical solution tank> Diameter: 45cm Height: 75cm Inner diameter of bubble discharge section 2: 13mm Bubble discharge port 2: 18mm in diameter (only one opening facing downwards)

[0037] <Composition of the chemical solution> N-[(Z)-9-octadecenyl]propane-1,3-diamine: 0.2% 3-Methoxypropylamine: 0.6% 2-(2-aminoethoxy)ethanol: 2.4% Polyoxyethylene alkylamine: 0.03% Remainder: water

[0038] <Air supply conditions> 1.0 NL / hr

[0039] As a result, no changes in appearance were observed even after three months, and the decrease in the concentration of the active ingredient (film-forming substance) of the drug was suppressed to 10%.

[0040] [Comparative Example 1] The test was conducted under the same conditions as in Example 1, except that no air was blown into the mixture. The concentration of the active ingredient decreased over time, falling to 20% after 3 months. Creaming also occurred after 3 months.

[0041] From the above, it has been confirmed that the present invention is effective even under conditions such as high temperature and dilution, which make it difficult to maintain stability for emulsion-type chemicals. [Explanation of Symbols]

[0042] 1. Chemical tank 2. Bubble Discharge Section 3. Gas supply means 4 Medicine injection means 11 Suction pipe

Claims

1. A tank for containing a chemical solution that is separable, The tank includes a bubble dispensing unit for discharging bubbles into the tank to agitate the chemical solution, A chemical solution storage tank having a gas supply means for supplying gas to the bubble discharge section.

2. A chemical solution storage tank according to claim 1, further comprising a chemical injection means for injecting the chemical solution in the chemical solution tank.

3. The chemical solution storage tank according to claim 2, characterized in that the chemical solution intake portion of the chemical injection means is located below the bubble discharge portion, or is located at a distance from the bubble discharge portion so that bubbles from the bubble discharge portion are not taken into the chemical injection means.

4. A storage tank for an emulsion-like chemical solution according to any one of claims 1 to 3.

Images