JPS6129469Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a simple preparation device for drug solutions.
As is well known, chemical solutions such as powerful chemicals for chemical reactions, such as hydrochloric acid and ammonia, have strong irritating odors, and when transporting these reagent bottles into a room or preparing a chemical solution with a desired concentration, it is necessary to spread the odor into the surrounding area. It is extremely difficult to handle and has a great negative impact on the human body. For example, when manufacturing microscopic electronic components such as semiconductor products, these chemical solutions may be diluted for cleaning purposes. When mixed inside, it emits a significant odor to the surrounding area. The emission of such odors is the contamination of indoor air.
This not only harms the human body, but also damages the product.

This invention aims to solve these problems and suppress the emission of harmful gases as much as possible.
Its feature is that it proposes a compounding device that creates a chemical solution with a desired concentration based on the amount of increase in volume by bubbling chemically reactive gas in a transparent container whose internal volume is displayed.

Hereinafter, a detailed explanation will be given with reference to an example. For example, an ammonia solution is prepared by leading ammonia gas piping from outdoors to an indoor chemical processing hood, making it bubble in water in the hood, and then returning the bubbled gas to the piping for waste gas treatment. Send to the tower. In this way, the emission of ammonia gas inside the room is almost eliminated. For this purpose, a diagram showing the relationship between the volume of the solution and the ammonia concentration at 20°C, which was confirmed through experiments, is shown in Figure 1. In this way, since the specified (N) concentration and volume are proportional, put a scale on the transparent container,
This is used as a standard for the concentration, and FIG. 2 shows an embodiment of the blending device.

The figure shows a transparent quartz container 1 with an internal volume of about 3. Ammonia (NH ₃ ) gas is fed into the quartz container 1 through a gas supply pipe equipped with a solenoid valve 2, a gas filter 3, a flow meter 4, and a needle adjustment valve 5. bubbles in water (e.g. pure water). The gas that is not absorbed by the water is discharged from the gas discharge pipe 7 to the outdoor waste gas treatment tower, and the entire quartz container 1 has a double-pipe structure 8 to cool the ammonia absorption reaction heat, so that the container is constantly cooled. ing. The ammonia gas to be bubbled is piped from an outdoor cylinder or tank and connected to a solenoid valve, and when an ammonia solution of a desired concentration is taken out from the quartz container 1, the solenoid valve 9 is opened and taken out. Reference numeral 10 denotes a solenoid valve for water injection, which allows a certain amount of ammonia gas to flow into the container 1 before it is bubbled. For example, to create a 3N ammonia solution, bubble ammonia gas into the inflowing water, stop the bubbling when the volume increases to about 110%, and pour the 3N ammonia solution into a quartz container. to be held within. When all the ammonia solution in the container is used up, water is poured in again and the ammonia solution of the desired concentration can be prepared in the same way.

In this way, neither the inflowing ammonia gas nor the emitted gas will escape into the room, and if the ammonia solution used is as dilute as 3N, the amount of ammonia gas volatilized will be small even if taken out in the hood. . This is a significant improvement over the conventional method of dispensing a 15N ammonia reagent bottle by opening its lid and emitting a strong odor.

Although the preparation of an ammonia solution has been described above, a hydrochloric acid solution can also be prepared using a similar mixing device. Hydrogen chloride emitted from a hydrochloric acid solution has a pungent odor and is also harmful, but it is often diluted and used for pickling. Figure 3 is a diagram of the relationship between the volume of the solution and the concentration of hydrochloric acid at 20°C, which was confirmed through experiments.As shown in the figure, the specified (N) concentration and volume are proportional, so the diagram is shown in Figure 2 in the same way as for the ammonia solution. By setting a scale on the compounding device, a diluted 2-3N hydrochloric acid solution can be prepared without emitting a large amount of hydrogen chloride into the room. Furthermore, the blending device shown in FIG. 2 is equipped with a liquid level sensor, and the inflow and stop of water and gas can be automatically performed using a solenoid valve, which makes the device more convenient and labor-saving.

As described above, the present invention is an extremely effective compounding device that can keep the air in the chemical processing chamber clean, and its effects are remarkable.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the relationship between the volume of the solution and the concentration of ammonia, FIG. 2 is a diagram showing the relationship between the volume of the solution and the concentration of hydrochloric acid. In the figure, 1 is a transparent quartz container, 2 is a solenoid valve,
3 is a gas filter, 4 is a flow meter, 5 is a needle adjustment valve, 6 is a gas supply pipe, 7 is a gas discharge pipe, 8 is a double pipe for water cooling, 9 is a solenoid valve, and 10 is a water injection solenoid valve.

Claims (1)

[Scope of utility model registration request] A chemically reactive gas is bubbled inside a transparent container whose internal volume is displayed, water is injected into the transparent container, and a chemically reactive gas is injected from a gas supply pipe, and the volume increase inside the container is measured as a standard. A chemical solution mixing device characterized in that it creates a chemical solution with a desired concentration.