JP3291619B2 - Sodium hypochlorite solution generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for obtaining a sodium hypochlorite solution by electrolyzing a sodium chloride solution.

[0002]

2. Description of the Related Art An apparatus for producing sodium hypochlorite is disclosed in JP-B-63-28997 (Japanese Patent No. 148330).
No. 4). In this known example, sodium hypochlorite is transferred by hydrogen gas generated in proportion to the electrolytic current. The salt of the raw material is stored in another tank 3 and dissolved in saturated saline, and the saturated saline is dissolved. Water is added to the storage tank 1 to make a 3-5% diluted saline solution, and the diluted saline solution is sent into the electrolytic cell 7 to produce a sodium hypochlorite solution (effective chlorine 8,000 mg / l). Was.

[0003]

This conventional apparatus must have a salt storage tank 3 and a saturated salt water storage tank 1, which has the disadvantage of increasing the size of the apparatus. The concentration of sodium hypochlorite solution produced from the electrolysis of diluted chlorine is low, and a high-concentration generator has been required.

Accordingly, the present invention provides an apparatus for producing a high-concentration sodium hypochlorite solution while reducing the size of the apparatus.

[0005]

In the sodium hypochlorite solution producing apparatus according to the present invention, a salt storage tank for storing salt and a water tank having a water supply port for storing dissolved water of salt are provided through a partition wall. A salt-dissolved water supply port for supplying salt-dissolved water from the water tank to the salt storage tank is formed on the partition wall, and takes in saturated salt water from an opening that opens into the salt tide tank. An electrolytic cell provided with an electrode for electrolyzing the saturated brine taken in is provided, and a transfer pipe for sending the sodium hypochlorite solution into the water tank by utilizing the buoyancy of the generated hydrogen gas is provided in the electrolytic cell. together it is, is provided with a flow exit for feeding to the outside by the overflow of diluted diluted sodium hypochlorite solution produced in said water tank (claim 1).

Therefore, saturated salt water is supplied from the salt storage tank into the electrolytic cell, and a sodium hypochlorite solution is generated in the electrolytic cell. Then, the hydrogen gas generated together is sent into the water tank through the transfer pipe. In the water tank, it is diluted and sent out from the outlet to external equipment. Then, the salt-dissolved water is automatically replenished from the salt-dissolved water supply port by the amount of the sent liquid, and the dissolved water dissolves the salt while passing through the salt crystals and is replenished into the electrolytic cell with saturated salt water. Electrolysis is performed as described above, and a high-concentration sodium hypochlorite solution (effective chlorine 30,000 mg / l) is produced.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention. The tank 1 is divided into a salt storage tank 2 and a water tank 3 by a partition wall 4. In the salt storage tank 2, while crystals of salt (NaC1) are dissolved in diluting water composed of water described below, the crystals and a saturated solution are stored together. Further, in the salt storage tank 2, an electrolytic tank 7 for electrolyzing a salt described below is arranged. Reference numeral 5 denotes an inlet for charging the salt.

The electrolytic cell 7 has, for example, a cylindrical shape and is disposed horizontally below the liquid level of the sodium chloride solution in the salt storage tank. The electrolytic cell 7 has an opening 8 at the front side, and saturated salt water flows into the inside through a filter 9 provided therein. A pair of electrodes 10a and 10b composed of an anode and a cathode are inserted into the electrolytic cell 7,
The base ends of Oa and 10b are insulated and fixed to the flange 12 via an insulator 13. These electrodes 10a, 10b
An electrode wire of one or more elongated wires of the platinum group;
It consists of a substrate made of titanium which binds the electrode wires.

The transfer pipe 15 is connected to an outlet 16 formed at the upper part of the electrolytic cell 7 and is connected to the transfer pipe 15.
Has an opening 17 in the water tank 3, specifically, in the partition wall 4. Therefore, the sodium hypochlorite (N
aCLO) and hydrogen (H ₂ ) are transferred through the transfer pipe 15 to the water tank 3
Sent out within.

The water tank 3 has a water supply port 19 to which water is supplied,
An outlet 20 for sending out the diluted sodium hypochlorite solution is provided, and a liquid level is regulated at a tip 20a of the outlet 20. A salt water supply port 21 through which dissolved water flows into the salt storage tank 2 is formed in a partition wall 4 that separates the water tank 3 from the salt storage tank 2. A hole 22 is provided above the water tank 3 and discharges hydrogen to the outside.

In the above configuration, salt crystals are charged into the storage tank 1 and the dissolved water is supplied to the salt-dissolved water supply port 21.
And the storage tank 1 has both salt crystals and saturated brine dissolved therein. Here, when electricity is supplied to the electrodes (10a, 10b), the sodium chloride solution in the electrolytic cell 7 is electrolyzed, and sodium hypochlorite is generated in accordance with the amount of electricity supplied, and hydrogen is generated around the electrode 10b on the cathode side. Gas is generated.

The reaction formula at the anode is as follows:

At the anode, 2Cl ⁻ → Cl ₂ + 2e 2H ₂ O + 2e → H ₂ + 2OH ⁻

Embedded image 2Na ⁺ + 2OH ⁻ → 2NaOH + H ₂は In the liquid in the electrolytic cell, the chemical reaction is as shown in Chemical formula 3.

Embedded image Cl ₂ + 2NaOH → NaClO + NaCl + H ₂ O

In the early stage of the generation of hydrogen gas, the sodium hypochlorite solution cannot be sent out of the electrolytic cell 7 due to its small bubbles, and collects at the upper part of the electrolytic cell 7 and gradually removes the bubbles. When the size is increased and the bubbles become large enough to block the transfer tube 15, the sodium hypochlorite solution stored in the transfer tube 15 is discharged into the water tank 3 while being pushed out. A new sodium chloride solution equal to the discharged amount is sent from the storage tank 2 to the electrolytic tank 7, and the above-described steps are repeatedly performed.

In this case, the amount of the sodium hypochlorite solution also increases as the amount of electricity supplied to the electrodes 10a and 10b increases. In the embodiment, since the saturated salt water is electrolyzed, a high concentration sodium hypochlorite solution having an available chlorine of 30,000 mg / l is produced. Since the saturated salt water is used as the electrolytic solution, there is no change in the liquid resistance and there is no change in the electrolytic current at a low voltage.

The sodium hypochlorite sent into the water tank 3 is diluted with water, and the diluted solution is sent to a desired device through the outlet 20 and is mainly used as a disinfectant.

FIG. 2 shows a second embodiment of the present invention. This embodiment is different from the first embodiment in that the electrolytic cell 7 is disposed in the water tank 3 and the opening 8 at the tip thereof is disposed in the salt storage tank 2. It is open. Therefore, the saturated salt water can be introduced into the electrolytic cell 7 through the opening 8. Other components are the same as those of the above-described embodiment, and therefore, the same reference numerals are given and the description is omitted.

[0018]

As described above, according to the present invention, a high-concentration sodium hypochlorite solution can be obtained for electrolyzing saturated saline. In addition, since a dilute salt water tank is not required separately from the salt storage tank, there is an advantage that the apparatus can be downsized as compared with the conventional example.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 tank 2 salt storage tank 3 water tank 4 partition wall 7 electrolytic tank 10a, 10b electrode 15 transfer pipe 19 water supply port 20 outlet 21 salt water supply port for dissolved salt water

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C25B 1/00-15/08

Claims (1)

(57) [Claims] 1. A salt storage tank in which salt is stored and a water tank having a water supply port and in which salt water is stored through a partition wall, wherein the salt water is supplied from the water tank to the partition wall. A salt solution supply port for supplying to the salt storage tank is formed, and an electrolytic tank provided with an electrode for taking in saturated salt water from an opening opening in the salt storage tank and electrolyzing the taken saturated salt water is provided. A transfer pipe for feeding the sodium hypochlorite solution into the water tank by utilizing the buoyancy of the generated hydrogen gas in the electrolytic tank, and a diluted diluted hypochlorous acid generated in the water tank. Over sodium solution
Sodium hypochlorite solution generating apparatus characterized in that a flow exit for feeding to the outside at Furo.