KR100417813B1 - Apparatus for decolortion of blue jean - Google Patents

Abstract

An jeans discoloration apparatus that is environmentally friendly and has high efficiency even at low temperatures is disclosed. The apparatus of the present invention is divided into a positive electrode space with a positive electrode and a negative electrode space with a negative electrode by a semi-permeable diaphragm, and electrolyzes sodium chloride solution to generate chlorine and hydrogen, and sodium hydroxide solution and hypochlorous acid solution into the positive electrode space and the negative electrode space. Process liquid for the electrolytic liquid tank to be concentrated, the duct and duct pipe to collect and transport the hydrogen and chlorine gas in the anode space and cathode space of the electrolysis liquid tank, the process tank in which the jeans discoloration process is performed, and the hypochlorous acid solution concentrated in the anode space. Process pipes are provided to be sent to the tank, and a scrubber having a processing chamber and a recovery liquid tank, sodium hydroxide pipes for supplying the sodium hydroxide solution concentrated in the cathode space to the scrubber may be further provided. In addition, the processing chamber is connected to the duct through the duct pipe, the recovery liquid tank is installed to recover the sodium chloride solution obtained in the processing chamber, the process piping is connected to the electrolysis liquid tank and the input piping and output piping, the chloride of the recovery liquid tank It is suitable for the recycling of the processing raw material that the recovery pipe is further provided so as to transfer the sodium solution to the electrolysis liquid tank.

Description

Jeans Bleacher {APPARATUS FOR DECOLORTION OF BLUE JEAN}

The present invention relates to a jeans bleaching apparatus, and more particularly to an environmentally friendly jeans bleaching apparatus.

Jeans are commonly referred to as pants, made of a fabric obtained by applying a blue dye, such as indigo blue, to a very tightly woven twill. Therefore, jeans are favored by practicality that they are very tough and durable. On the other hand, like other fashion clothes, jeans are produced in various forms while changing the shape and color according to the taste and taste of the consumer.

In particular, jeans are very tough and strong, but they have too stretchy textures in the early stages of wear, so that consumers or manufacturers or traders deliberately wear jeans that were first made by sandblasting or stone washing. I often wear it and sell it. In addition, in the case of the first dyed jeans, the color is often very strong, and in some cases, a color bleaching agent such as sodium hypochlorite solution is acted together in the drum treatment process to cause some color bleaching.

However, conventionally, the method of decolorizing jeans through the decolorizing process has many problems. Conventional conventional treatments for discoloration include chemicals such as sodium hypochlorite or calcium hypochlorite in a large amount of water at 60 to 80 ° C., further adding grinding means as necessary, and then putting the drum together with the jeans. The process was put and rotated for 30 minutes or more. Thus, for example, if a certain type of tape is attached to jeans to achieve the desired shape, the tape will not only be affected by water or other chemicals, but also by the vortices in the water during rotation, depending on the drum treatment. There may be a departure. In addition, the tape may be more frequently pushed away from its original position as the adhesive component of the tape softens due to the high decolorization treatment temperature. Therefore, it is difficult to obtain the desired shape, and if the tape falls off from the jeans in the middle of the treatment, the position where the tape is stuck afterwards becomes discolored, so that it is difficult to obtain a vivid color and shape.

In the conventional decolorizing method, there is a problem in that a cost for raising the temperature of the treatment solution, a cost for continuously supplying sodium hypochlorite, which is a jeans treatment raw material, and a large amount of water, are consumed. In addition, the wastewater used for decolorization is discarded, but if the wastewater is discharged to the sewage in large quantities, there may be a problem of environmental pollution, and if it is treated and discharged, there is a problem of a separate treatment cost.

The present invention is to solve the problems of the conventional jeans discoloration method described above, to provide an environmentally friendly jeans discoloration apparatus that can prevent the generation of waste during the jeans discoloration process, cost or pollution of the treatment. It aims to do it.

In addition, an object of the present invention is to provide a jeans bleaching apparatus that can reduce the cost of the bleaching process by recovering the chemicals to be used as a raw material from the waste generated during the jeans bleaching process.

In addition, according to the present invention, since a high decolorization treatment temperature and a drum treatment are not required, it is an object to provide a jeans decolorizing apparatus suitable for obtaining a desired design in vivid colors when using means such as taping.

1 is a schematic diagram conceptually showing the overall configuration of an embodiment of a jeans bleaching apparatus of the present invention;

Figure 2 is a partial detail view of the duct piping and scrubber portion in detail in one embodiment of the device of the present invention.

The present invention device for achieving the above object is provided with an electrolysis liquid tank, a scrubber, a process liquid tank. In the electrolysis bath, sodium chloride solution is supplied to perform electrolysis. The total space of the electrolysis liquid tank includes an anode space where anodes are installed and hypochlorous acid is collected, and a cathode space where sodium hydroxide is concentrated by the cathode. These two spaces are usually divided through semipermeable diaphragms. Above these two spaces, a duct for collecting hydrogen and chlorine gas generated from the electrode is installed and a duct pipe for connecting the collected gas with a scrubber is provided. The scrubber has a processing chamber to which gas to be treated is supplied, and the processing chamber is also supplied with a sodium hydroxide solution, which is a processing liquid, for gas treatment. In order to increase the contact area between the processing liquid and the gas to be treated, a shower facility for spraying the processing liquid into the processing chamber and a dummyster for condensing and collecting fine liquid particles may be further provided. The recovery liquid tank to be collected after the treatment liquid supplied to the treatment chamber reacts with the gas to become the recovery liquid centered on the sodium chloride solution is usually installed integrally or separately under the treatment chamber.

A sodium hydroxide pipe may be installed to transfer the sodium hydroxide solution, which is the treatment liquid of the scrubber, from the cathode space of the electrolysis tank to the processing chamber, and a recovery pipe may be installed to supply the recovery liquid collected in the recovery tank back to the electrolysis tank. . The process liquid bath forms a process space in which the jeans decolor. The anode space of the electrolysis bath and the process bath may be connected via process piping. The process piping may be formed as a single piping pipe, but the input piping pipe in which the solution of hypochlorous acid is concentrated flows from the anode space to the process tank and the output piping in which the hypochlorous acid is consumed in the opposite direction and the hydrochloric acid is increased after the process flows. It is preferably made of pipes. DC electrodes are connected to both electrodes of the electrolytic bath, and valves, pumps, and duct pipes are generally provided with a fan to easily transfer materials to be transferred to each pipe.

On the other hand, plumbing for supplying water, sodium chloride, or hydrochloric acid in an initial or in-process supplement may also be provided as ancillary.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, and at the same time, chemical reactions and actions performed in the respective parts of the present invention will be described.

1 is a view conceptually showing the overall configuration of an example of the jeans decoloring apparatus of the present invention.

Referring to Fig. 1, a liquid tank having a semi-permeable membrane 7 in the center is an electrolysis liquid tank 10. The electrolysis bath 10 is initially supplied with a small amount of hydrochloric acid (HCl) and sodium chloride (NaCl) solution. The sodium chloride solution preferably has a component content of the solute of 0.1 to 7% by weight. The electrolytic bath 10 has a negative electrode 5 and a positive electrode 3, and usually the positive electrode 3 uses a platinum or platinum-plated conductor, and is highly electroconductive and does not corrode sodium hydroxide. Use substance. The cathode 5 may use stainless steel resistant to corrosion. When power is connected to both electrodes and a voltage is applied, sodium ions dissociated from sodium chloride are induced in the cathode 5 to obtain electrons and form sodium metal. Sodium metal immediately reacts with water to form sodium hydroxide, which is dissolved directly in water to form a sodium hydroxide solution. At this time, hydrogen gas is generated and released. Chlorine ions are induced in the anode 3 to lose electrons and become chlorine molecules. Some of the chlorine molecules are released into the air as gases, and some react with water to form hydrogen chloride and hypochlorous acid, which are then dissolved in water to form a solution of hydrochloric acid and hypochlorous acid. Hypochlorous acid (HOCl) is an oxidizing agent with a strong oxidizing power of 40 to 80 times that of sodium chlorate (NaOCl), which is a component of Lax, which is often used as a commercial germicidal bleach. Although the cathode space 8 and the anode space 9 are separated by the diaphragm 7, sodium ions, chlorine ions or hydrogen ions can move well. Thus, the electrolysis liquid tank 10 has a reduced sodium chloride content over time, and has a hypochlorous acid solution and a sodium hydroxide solution concentrated in the anode space 9 and the cathode space 8. At this time, hydrochloric acid is attracted to each electrode to generate a portion of chlorine and hydrogen, so it is not concentrated. The chemical formula constituting the generating material of each electrode is as follows.

Cl ₂ + H ₂ O = HCl + HOCl

2Na + 2H ₂ O = 2NaOH + H ₂

On the other hand, the electrolysis liquid tank 10 is connected to the process liquid tank 30 in which the jeans discoloration process is performed through the process piping. The process piping includes an output pipe formed so that the material flows from the process liquid tank 30 to the electrolysis liquid tank 10 and an input pipe 18 formed so that the material flows from the electrolysis liquid tank 10 to the process liquid tank 30. In the input pipe 18 and the output pipe, pumps and valves for moving the solution are installed. In this case, the input pipe 18 may be installed as a single pipe so as to serve as an output pipe, and the pump is installed to allow flow in both directions. When the concentration of hypochlorous acid reaches a certain level in the anode space 9 of the electrolysis liquid tank 10, the solution in the anode space 9 in which the hypochlorous acid solution is the center is the process liquid tank 30. Is transported through.

1 and 2, the electrolysis liquid tank 10 further includes a chlorine collecting duct 12 for collecting chlorine gas and hydrogen gas generated in the upper portion of the anode space 9 and the upper portion of the cathode space 8, respectively. ) And a hydrogen collection duct 14 are installed. These ducts 12 and 14 are connected to the scrubber 20 for the treatment of gas through the gas transfer duct pipe 16. The duct pipe 16 may be provided with a blower shown to facilitate gas transfer and to facilitate gas collection. As shown in the middle of the duct pipe 16, the confluence point is formed may be made so that the collected gases are mixed together. In addition, the confluence point may be formed to form one reaction chamber 161 at the stage just before the scrubber 20. At the confluence, hydrogen and chlorine react to form hydrogen chloride gas. Hydrogen chloride gas is supplied to the processing chamber which occupies most of the space of the scrubber 20.

The shower 22 is installed on the entire surface of the processing chamber. The shower facility 22 is connected to a shower pipe 34 connected to the recovery liquid tank 24 under the processing chamber. The shower pipe 34 is provided with a recycling pump and a valve. The recovery liquid tank 24 is connected with a sodium hydroxide pipe 26 for supplying a sodium hydroxide solution generated in the cathode space 8 of the electrolysis liquid tank.

Therefore, the sodium hydroxide pipe 26 can transfer the chemical solution mainly composed of the sodium hydroxide solution filling the cathode space 8 to the recovery liquid tank 24 of the scrubber 20. Once, the sodium hydroxide solution transferred to the recovery bath 24 is sprayed into the processing chamber through the shower piping 34 and the shower facility 22. The sprayed sodium hydroxide solution reacts with most of the hydrogen chloride gas supplied to the processing chamber to form a sodium chloride solution. Most sodium chloride solution falls into the recovery bath. The recovery bath is sprayed by the shower 22 through the shower pipe 34 again with the unreacted sodium hydroxide solution mixed with the sodium chloride solution produced by the reaction. Repeating this recycling process, if most of the sodium hydroxide solution is changed to sodium chloride solution, a sensor installed in the recovery bath 24 detects it and can determine when to send the solution of the recovery bath 24 to the electrolysis bath 10. have.

Partially scattered droplets of fine solution in the processing chamber of the stubber 20 are condensed and collected in a dummyster 36 of the scrubber 20 and flow down into the recovery tank. Therefore, only harmless gases are discharged through the upper exhaust port of the scrubber 20 to prevent air pollution. The chemical reactions formed at the confluence point of the exhaust duct 16 and the scrubber 20 are summarized as follows.

H ₂ + Cl ₂ = 2HCl

HCl + NaOH = NaCl + H ₂ O

The return pipe 32 is also provided with a valve and a pump. Therefore, the sodium chloride solution obtained in the recovery liquid tank 24 of the scrubber 20 through the recovery piping 32 is transferred to the electrolysis liquid tank 10. Since the components constituting the sodium chloride solution are all derived from the electrolysis liquid tank 10, it can be said that the process raw materials are recovered.

Referring back to FIG. 1, the jeans 31, which need to be decolored, are immersed in the process liquid tank 30 filled with the solution of hypochlorous acid (including some hydrochloric acid and other substances) transferred from the anode space. On the other hand, when a part of the surface of the jeans 31 is described with a case of protecting by a tape, the chemical reaction is suppressed in the portion to which the tape is attached, the dye expressing the color of the jeans 31 in the portion not protected by the tape The components are reacted with hypochlorous acid, which has strong oxidizing power, to a large extent oxidized and some chlorination reactions can be made. Since the oxidation power of hypochlorous acid is very strong, it is also possible to make the temperature at which the reaction takes place at a room temperature of 20 to 30 degrees Celsius around 25 degrees Celsius. In addition, the time for dipping the jeans 31 in hypochlorous acid may also vary depending on the process conditions, but usually 2 minutes to 10 minutes is sufficient. Therefore, in the process liquid tank 30 of the present apparatus, the process may be quickly performed at room temperature without a separate drum or heater, and the probability of the attachment tape falling may be greatly reduced.

The jeans 31 gradually discolor as the dye components change. The degree of discoloration can be adjusted according to the time for dipping the jeans 31 in hypochlorous acid, the concentration and temperature of hypochlorous acid, and the like. Since the hypochlorous acid which decolorizes the jeans 31 is changed to hydrogen chloride, when the decolorization process for many jeans 31 is performed in the process liquid tank 30, the hypochlorous acid solution of the process liquid tank 30 becomes a solution mainly containing dilute hydrochloric acid. Change. The dilute hydrochloric acid solution thus obtained is supplied to the electrolysis liquid tank 10 through the output piping of the process piping. At this time, the diluted hydrochloric acid solution is also made of materials supplied from the electrolysis liquid tank 10, so the supply of the diluted hydrochloric acid solution may be referred to as a kind of recovery process. Illustrating the chemical reaction carried out in the process liquid tank 30 is as follows. At this time, the R group (R-) is an atomic group having an arbitrary structure, and the dye component usually consists of an organic group.

R-H + HOCl = R-OH + HCl

RH + HOCl = R-Cl + H ₂ O

Although it may vary depending on the type of the dye, the oxidized or chlorinated dye components usually remain attached to the jeans 31 so that the dilute hydrochloric acid solution may be recovered without being diffused into the process tank 30. If the changed dye components are separated from the chunba 31 to contaminate the process tank 30, the changed dye components through a separate treatment process to be supplied to the electrolysis tank 30, or disposed of .

In the above embodiment, it is described that the steps are separated and have a time difference according to the steps, but the apparatus of the present invention may also perform a continuous process in which circulation of materials is continuously performed. That is, by controlling the initial input of the processing raw material and the specific component content of the solution in each part, and by controlling the speed of the material transfer through the pump speed and the valve opening degree of the installed pipes, By controlling the rate of electrolysis through the amount and optimizing environmental conditions such as temperature, pressure, which are variables of the process reaction, the apparatus of the present invention may perform a continuous process. In this continuous process, there is an advantage in that the automation of the device of the present invention is facilitated because the need to input manpower for the operation of the valve or the pump of each pipe in each process step is reduced.

On the other hand, for the automation of the apparatus of the present invention, a sensor for measuring the content of a specific component in the space of each liquid tank and a controller for changing the speed of the automatic pump or the opening of the automatic valve through the signal of the sensor, etc. It may be provided.

According to the apparatus of the present invention described through the above embodiment, all materials can be cyclically operated except for oxygen or chlorine, which is partially reduced together with the dye. This reduces the cost of raw materials and waste disposal. In addition, a continuous jeans decolorization process is possible only by supplying electricity while replenishing water or chlorine gas to replenish some hydrogen released as oxygen and gas, and automatic process is easy.

Claims (5)

The semi-permeable diaphragm is divided into an anode space with an anode and a cathode space with an anode, and electrolyzes the sodium chloride solution to generate chlorine and hydrogen, and collects sodium hydroxide solution and hypochlorous acid solution in the anode space and the cathode space. Decomposition liquid bath, Duct and duct pipe to collect and transport the hydrogen and chlorine gas in the anode space and the cathode space of the electrolysis liquid tank, Process liquid bath in which the jeans bleaching process is performed, Jeans decoloring apparatus characterized by comprising a process piping provided to send the hypochlorous acid solution concentrated in the anode space to the process liquid tank. The method of claim 1, A scrubber having a processing chamber and a recovery liquid tank, Sodium hydroxide piping for supplying the sodium hydroxide solution concentrated in the cathode space to the scrubber is further provided, The processing chamber is connected to the duct through the duct pipe, And the recovery liquid tank is installed to recover the sodium chloride solution obtained in the processing chamber. The method of claim 2, The sodium hydroxide pipe is connected to the recovery liquid tank of the scrubber, The upper part of the processing chamber is provided with a shower facility for spraying the sodium hydroxide solution to the gas supplied through the duct pipe and a dummyster for condensing the steam generated in the processing chamber, Jeans decolorizing apparatus further comprises a shower pipe for supplying the sodium hydroxide solution in the recovery liquid tank to the shower. The method of claim 2, The process pipe is provided with an input pipe capable of sending the hypochlorous acid solution concentrated in the anode space to the process liquid tank and an output pipe capable of transferring hydrochloric acid of the process liquid tank to the electrolysis liquid tank. Jeans decolorizing apparatus further comprises a recovery pipe installed to transfer the sodium chloride solution of the recovery tank to the electrolysis tank. The method of claim 4, wherein The power connected to the positive electrode and the negative electrode is a power that can be adjusted so that the flowing current is constant The pump and valves installed in each of the pipes is a jeans bleaching apparatus, characterized in that the continuous processing is made of a pump and valves adjustable so that the flow rate of the material flowing through the pipes during the process.