JPS592821Y2 - Chlorine dioxide gas processing equipment - Google Patents

Description

[Detailed description of the invention] This invention is a method for continuously scouring textile products such as fabrics and threads.
This invention relates to a treatment device for harmful gas containing chlorine dioxide discharged from a purple oven used for bleaching.

Sodium chlorite has been used as a conventional means of scouring and bleaching the above textile products, but in the scouring and bleaching treatment using sodium chlorite, textile products padded with sodium chlorite are placed in a reaction tank. and steam it,
Bleaching is carried out by decomposing it through acid activity, but during this process, some of the sodium chlorite reacts with the reactants and is neutralized, thus losing its toxicity, but other A large amount of sodium chlorite decomposes in the steam and becomes harmful chlorine dioxide gas.

This exhaust gas containing chlorine dioxide cannot be released into the atmosphere unless it is dechlorinated outside the reaction tank in order to prevent pollution. This process requires a large amount of water and chemicals, and furthermore, There were disadvantages such as the need for a large-scale processing device.

The present invention was devised in order to eliminate such inconveniences, and allows the exhaust gas containing chlorine dioxide in the reaction tank to react with iron to form iron oxide and iron chloride, thereby making it possible to treat the exhaust gas containing chlorine dioxide in a harmless manner. It is something that

Therefore, according to the present invention, the equipment for treating harmful gases can be simplified, and it is also economical because less water is used, and it is also possible to achieve harmless treatment.

The present invention will be described in detail below based on embodiments shown in the drawings.

1, textile products are placed in a purple range for scouring and bleaching, and this purple range is provided with a textile product inlet 2 and a textile product outlet 3, and in this purple range, sodium chlorite is impregnated. The fiber products are subjected to heat treatment.

When textile products impregnated with sodium zincate are subjected to thermal treatment, exhaust gas containing chlorine dioxide is generated in this purple range, but this generated gas is collected near the inlet 2 and outlet 3 of the purple range. The gas treatment tube 5 is guided into the gas treatment tube 5 through the piping 4. A screen 7 is laid on the inner bottom of a case 6 made of a rust-resistant material.
The top is filled with iron scraps 8.

It is advantageous for this iron scrap 8 to be, for example, cutting scrap from a lathe.
Other scrap iron can also be used.

Further, the portion filled with iron scraps 8 is densely filled to allow gas to pass therethrough.

An exhaust port 9 and a saucer 10 are provided at the bottom of the gas treatment cylinder 5, and the exhaust port 9 is connected to an air supply port 12 leading to the lower part of a liquid tank 11 in which a caustic soda solution and a hydrogen peroxide solution are mixed.
is familiar with

Further, the saucer 10 communicates with the inside of the liquid tank 11 via a liquid pipe 13.

Reference numeral 14 denotes an ejector nozzle located concentrically with the air supply port 12, and this nozzle 14 is connected to the bottom of the liquid tank 11 via a pump 15.

16 is an overflow port, and 17 is a washing water supply pipe.

Next, to describe its effect, the exhaust gas containing chlorine dioxide generated in the purple range 1 is supplied into the interior from the upper part of the gas treatment cylinder 5, comes into contact with the iron scraps 8, and as shown in the formula below, iron chloride and iron oxide are formed. arise.

2 Cl 02+3 Fe=FeCl 3+2 Fe2
On the other hand, as the pump 15 rotates, the mixture 11' of caustic soda solution and hydrogen peroxide solution is injected from the ejector nozzle 14, so the exhaust port 9 becomes a negative pressure, and the process containing some unreacted chlorine dioxide. The gas is injected from the air supply port 12 by the ejector action while contacting the mixed liquid 11', and is further struck against the baffle plate 18 in the liquid tank 11, and the exhaust gas containing chlorine dioxide efficiently contacts and reacts with the mixed liquid, resulting in 2C102+ H2O2+2NaOH→2N act○
It will be decomposed into sodium chlorite, water, and oxygen according to 2+2H20+0□.

Therefore, by recovering the sodium chlorite, the exhaust gas containing chlorine dioxide is rendered harmless.

It is known that chlorine dioxide gas is treated with a mixture of caustic soda solution and hydrogen peroxide solution, but in the present invention, most of the chlorine dioxide gas generated from the purple range reacts with iron to produce iron chloride and oxide. Since it becomes iron, the amount of treatment with the mixed liquid is small, so the amount of mixed liquid can be small, and furthermore, a small and simple processing apparatus using the iron liquid can be used in sufficient time.

Further, since the present invention is a processing device that uses scrap iron, it is very inexpensive, and moreover, scrap iron such as lathe cutting waste, which is a waste product, can be effectively used.

In addition, the gas treatment tube containing scrap iron can be placed inside a purple microwave oven, etc., and can also be easily installed in other places.

In addition, the iron chloride and iron oxide adhering to the scrap iron can be effectively removed by injecting water from the supply pipe, increasing the reaction efficiency of the newly supplied chlorine dioxide gas. The iron chloride and iron oxide produced can be easily recovered by any desired means.

An example of chlorine dioxide-containing gas treatment using the apparatus of the present invention is as follows.

340 ppm ClO generated from Purple Range 1
When textile product processing exhaust gas containing C12 (2 and 32 ppmcr) is passed through the gas pipe 5 at a rate of 1200 m3/H and reacted with scrap iron, the C in the processing gas at the exhaust port 9 is
1O2 concentration is 160 ppm, Cl2 concentration is 14
It decreased to ppm.

Furthermore, this treated gas is passed through the water tank 11, and during this time from the ejector 14 16000 ml/H (7) 25%
35% H2 in NaOH and 11000 ml/H
When O2 is injected, Cl in the gas is released at the exhaust gas outlet of the aquarium.
O2 concentration is 3.3 ppm, CI2 concentration is 0.4 ppm
m, and there was no risk of pollution even if it was released into the atmosphere.

[Brief explanation of drawings]

The drawing is an explanatory diagram showing an embodiment of the chlorine dioxide gas processing apparatus according to the present invention. 1... Purple range, 2... Inlet, 3... Outlet, 4... Piping, 5...
...Gas treatment tube, 6...Case, 7...
...Surface, 8...Iron scraps, 9...Exhaust port, 10...Saucer, 11...Liquid tank, 1
2...Air supply port, 13...Liquid pipe, 14.
... Ejector nozzle, 15 ... Pump,
16... Overflow port, 17...
Washing water supply pipe, 18... baffle plate.

Claims (1)

[Scope of utility model registration request] A cylinder made of a rust-resistant material is provided with a supply port for gas containing chlorine dioxide at one end and an exhaust port for the gas at the other end. A gas treatment cylinder is filled with scrap iron so as to have air permeability, and is equipped with a water supply port for showering water onto the scrap metal. Ejector for spraying an aqueous solution containing caustic soda
A chlorine dioxide gas processing device comprising a water tank equipped with a nozzle.