JPS6344103Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a liquid removal device for an ion exchange column.

When regenerating the ion exchange resin (hereinafter referred to as resin) in the ion exchange column (hereinafter referred to as the column), the liquid in the column is used to mix, stir, or replace the liquid in the column. It becomes necessary to pull it out to a specified position above.

Conventionally, in such a case, as shown in FIGS.
By attaching a valve 4 to the column and opening the valve 4, the liquid in the column can be drawn out through the liquid drain pipe 3 to the position of the liquid drain pipe 3, or the liquid level can be measured in the column 1 as shown in Fig. 2. A measuring device 5 is provided, and a liquid drain pipe 3 and a valve 4 are provided at the bottom of the tower 1, and by opening the valve 4, the liquid in the tower is drawn out via the liquid drain pipe 3, and the liquid level is set. When the position is reached, the measuring device 5
The valve 4 can be closed in response to the signal, or a liquid drain pipe 3 and a valve 4 can be provided at the bottom of the tower 1 as shown in FIG. A riser pipe 6 on a horizontal plane is connected and is further located slightly above the upper surface of the resin layer 2.
There was a method in which a blow pipe 7 was branched and connected to the tower, and by opening the valve 4, the liquid in the tower was drawn out through the liquid drain pipe 3 to the height of the installation position of the blow pipe 7.

However, each of these methods has the following drawbacks. In other words, in the method shown in FIG. 1a, the mounting position of the liquid drain pipe 3 is close to the upper surface of the resin layer 2, so when the liquid is extracted, the resin may flow out together with the resin. If a strainer 13 is installed in the tower to prevent liquid from flowing out, the strainer 13 will be clogged with resin and the liquid extraction function will deteriorate. Furthermore, in the method shown in FIG. 2, the measuring instrument 5 is expensive and is prone to failure. Further, the method shown in FIG. 3 requires a long time to drain the liquid by gravity, and if the draining destination is higher than the liquid draining surface, draining becomes impossible.

The object of the present invention is to solve the above-mentioned drawbacks and to draw out the liquid in the column reliably and in a short time. In other words, the present invention forms a loop by connecting the upper and lower parts of the ion exchange tower through a riser pipe with an upper connecting pipe and a lower connecting pipe, and connects the upper and lower parts of the ion exchange tower to a horizontal plane located above the ion exchange resin surface in the ion exchange tower. By branching and connecting a blow pipe to the riser pipe section of the ion exchange column or attaching a compressed gas inflow pipe to the upper part of the ion exchange column or the upper connecting pipe, and allowing the compressed gas to flow in from the compressed gas inflow pipe. This invention relates to a liquid removal device for an ion exchange tower, characterized in that the liquid in the ion exchange tower is discharged from the blow pipe.

The present invention will be explained in detail below using the drawings.

FIG. 4 is a flow explanatory diagram of a liquid removal device for an ion exchange tower, which is an example of an embodiment of the present invention. 10, a lower connecting pipe 12 with a valve 4 is connected to the lower part, and an upper connecting pipe 1 is connected through the riser pipe 6.
1 and the lower connecting pipe 12 are connected to form a loop. Further, a blow pipe 7 is branched and connected to a riser pipe 6 portion on a horizontal plane located slightly above the upper surface of the resin layer 2.

Next, the operation of the present invention will be described. First, the valves 4, 8, and 10 are opened to supply compressed gas to the upper part of the column 1 from the compressed gas inlet pipe 9. When the inside of the tower 1 is pressurized in this way, the liquid inside the tower 1 flows into the lower connecting pipe 1.
2, valve 4, and riser pipe 6, and the riser pipe 6 and tower 1 are in communication via lower connecting pipe 12 and upper connecting pipe 11, so that the air in the rising pipe 6 is discharged. The liquid level and the liquid level in the column 1 can be made almost the same. In this state, the liquid in the tower 1 is quickly discharged to the outside of the tower 1, but when the liquid level reaches slightly above the upper surface of the resin layer 2, the liquid level in the riser pipe 6 also drops to the position of the blow pipe 7. The compressed gas supplied into the tower 1 is released to the atmosphere through the upper connection pipe 11, the riser pipe 6, and the blow pipe 7, and the inside of the tower 1 becomes atmospheric pressure, and the liquid discharge stops and the liquid removal is completed. . Note that the connection position of the compressed gas inflow pipe 9 is not limited to the upper part of the column 1, but the same effect can be obtained even if it is branched and connected to the upper connection pipe 11. Furthermore, when supplying compressed gas to the upper part of the column 1 in the liquid removal device of the present invention, if high-pressure compressed gas is used, only the liquid in the riser pipe 6 will be pushed down, and the compressed gas will flow out of the system via the blow pipe 7. Since sufficient liquid removal from the escape column 1 may not be possible, it is desirable that the pressure of the compressed gas is normally 2 kg/cm ² or less. However, if it is only the initial stage of pressurization, the liquid level in the riser tube 6 is sufficiently higher than the blow tube 7, so there is no problem even if the pressure is increased to 2 kg/cm ² or more.

In an ion exchange apparatus employing the liquid removal device of the present invention, when the upper part of the column 1 is pressurized to 2 kg/cm ² and when liquid is removed only by atmospheric pressure without pressurization,
There was a large difference in the discharge time, with the former being 10 minutes and the latter 30 minutes.

According to the above-described liquid removal device for an ion exchange column according to the present invention, there is no need to worry about the resin in the column flowing out, and the liquid in the column can be drained reliably and in a short time without the need for special measuring equipment. Furthermore, since the liquid is removed under pressure, it is possible to discharge the discharged liquid to a position higher than the liquid level in the column or to send it under pressure to a distance.

[Brief explanation of the drawing]

1 to 3 are flow explanatory diagrams showing a conventional liquid removal device for an ion exchange column, and FIG. 4 is a flow explanatory diagram showing a liquid removal device for an ion exchange column according to the present invention. 1... Tower, 2... Resin layer, 3... Liquid draining pipe, 4
...Valve, 5...Measuring instrument, 6...Rise pipe, 7...
... Blow pipe, 8 ... Valve, 9 ... Compressed gas inflow pipe,
10... Valve, 11... Upper connecting pipe, 12... Lower connecting pipe, 13... Strainer.

Claims (1)

[Scope of utility model registration request] A loop is formed by connecting the upper and lower parts of the ion exchange tower with an upper connecting pipe and a lower connecting pipe via a riser, and the riser is located on a horizontal plane above the ion exchange resin surface in the ion exchange tower. A blow pipe is branched and connected to the upper part of the ion exchange tower, and a compressed gas inflow pipe is attached to the upper part of the ion exchange tower or the upper connecting pipe, and the compressed gas is introduced from the compressed gas inflow pipe. A liquid removal device for an ion exchange tower, characterized in that the liquid is discharged from the blow tube.