JPS588772Y2 - electrolytic reactor - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a salt solution electrolytic reactor.

In particular, the present invention relates to an electrolytic reactor useful for producing standard gas by controlling the concentration of chlorine gas generated by electrolyzing an alkali chloride solution.

Conventionally, chlorine gas manufacturing plants or chlorine gas usage plants always have detectors in place to check for chlorine gas leaks, and if a leak is detected, an automatic alarm is issued and appropriate measures are promptly taken.

In order to check whether this detector is operating normally, it is necessary to perform verification correction using chlorine gas at a standard concentration at appropriate intervals.

In order to generate such a standard gas, it is advantageous to obtain a dilute chlorine gas of a predetermined concentration by electrolyzing the electrolytic solution while blowing a predetermined flow rate of diluent gas into it and varying the amount of current applied.

The present applicant previously filed a patent application for the method for producing the above-mentioned standard gas (Japanese Patent Laid-Open No. 70730/1983).

In this method, by using a metal chloride solution adjusted to pH 5 or less as an electrolyte, the OH- ions generated at the cathode are immediately annihilated, and the chlorine gas generated at the anode is consumed by reaction with the OH- ions. This prevents it from being redissolved in the electrolyte.

The inventors of the present invention have arrived at the present invention as a result of various studies aimed at miniaturizing and simplifying the electrolytic reactor used in this method.

That is, in the present invention, a core tube that opens in the upper lid of the container and has a flow path for blowing diluent gas is suspended from the upper lid of the container, and positive and negative electrodes are wound around the outer circumference of the core tube in a spiral shape. This is an electrolytic reactor for a salt solution, characterized in that the reactor is equipped with a tube and an electrolytic gas outlet is provided in the upper part of the container.

The drawings show an embodiment of the present invention, and in FIG. 1, a core tube 3 is suspended and attached to the upper lid 2 of an electrolytic reactor 1, and a flow for blowing dilution gas is installed inside the core tube 3. A channel 4 is provided, the upper end of which passes through the upper cover 2 and opens to the outside of the electrolytic reactor 1, and the lower end of which opens downward into the interior of the electrolytic reactor 1.

Further, around the outer periphery of the core cylinder 3, electrode strips 5 forming a positive electrode and electrode strips 6 forming a negative electrode are wound in a spiral shape alternately at a predetermined distance.

FIG. 2 shows the state of the core tube 3 in which the electrode strips 5 and 6 are wound in this manner.

Further, 7 is an outlet for electrolytic gas.

Now, when the inside of the electrolytic reactor 1 is filled with saturated saline solution 8 having a pH of 5 or less to a predetermined depth, the core cylinder 3 is immersed, and electricity is applied, chlorine gas is generated.

At this time, when diluting gas such as air is blown from the upper end of the flow path 4 at a constant flow rate (both not shown) through a flow meter using a blower installed outside the system, the supplied gas is electrolyzed from the lower end. The chlorine gas bubbles up into the liquid, dilutes it, and is discharged from the discharge port T. The chlorine gas is led to a chlorine gas leak detection meter (none of which is shown) through a conduit connected to its tip.

That is, by keeping the amount of current supplied constant, dilute chlorine gas with a constant concentration can be obtained.

Conventionally, electrolytic reactors for this purpose have a structure in which plate-shaped or mesh-shaped positive and negative electrodes are mounted separately and facing each other, but in such a structure, lowering the current density requires a large electrode area. Therefore, the capacity of the reactor becomes large, and the amount of electrolyte becomes large, so the amount of dissolved chlorine gas generated increases, and it takes a long time for the chlorine gas concentration to reach a constant value.

Conversely, if the current density is increased and the electrode area is decreased, the voltage will increase.

The chlorine gas leak detection meter needs to be able to be quickly transported to the leak location, and therefore it is desirable that the electrolytic reactor used to test it be as small as possible. There was a limit.

The electrolytic reactor of the present invention can attach positive and negative electrodes using one core tube, and the core tube itself can also be used as a diluent gas blowing nozzle, so the structure is extremely simple and lightweight.

Furthermore, the current density can be adjusted by adjusting the number of turns of the electrode bundle around the core cylinder, so even if the amount of current is increased, there is little effect on the voltage surface.

The core tube 3 is preferably made of synthetic resin, and the reactor 1 and the upper lid 2 are also preferably made of synthetic resin.

The electrode bundles 5 and 6 are conveniently made of platinum wire, but are not limited to this.

The shape of the core cylinder 3 may be a rectangular cylinder, and the shape of the electrode bundles 5, 6
A groove may be provided for fitting.

The lower end of the core cylinder 3 may be provided with a dispersion plate or may have a tapered nozzle shape to improve the dispersion of the diluent gas.

Since the electrolytic reactor of the present invention is constructed as described above, it is compact and lightweight, making it convenient to transport, and has a simple structure that allows for easy assembly and disassembly.

In addition, since the diluent gas is blown into the lower end of the core cylinder of the electrode bundle, the chlorine gas that is about to dissolve in the salt water can be efficiently escaped, and dilute chlorine gas with a constant concentration can be easily obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of the electrolytic reactor of the present invention, and FIG. 2 is a perspective view of a core cylinder used in the electrolytic reactor. 1... Electrolytic reactor, 2... Upper lid, 3.
... Core cylinder, 4 ... Dilution gas blowing channel,
5, 6... Electrode bundle, 7... Electrolytic gas outlet.

Claims (1)

[Scope of utility model registration request] A core cylinder having an opening in the upper lid of the container and having a flow path for blowing diluent gas is suspended from the upper lid of the container, a positive and negative electrode strip wound spirally around the outer periphery of the core cylinder is attached, and An electrolytic reactor for a salt solution, characterized in that an electrolytic gas outlet is provided in the upper part of the container.