JP3602301B2 - Decoloring method for dye-containing liquid - Google Patents

Description

【００２８】
表１の結果から明らかなように、消色処理後の染料含有液体は、無色、或いはほとんど無色で透過率も大きく、染料含有液体から主に染料を分解、除去することができる。特に、染料含有液体を加熱する方法は消色効果に優れており、また吸着剤を用いることにより染料、或いは染料の分解物や他の物質も除去される。
【００２９】
【発明の効果】
本発明によれば、染色液、筆記用インク、インクジェットインク、印刷インク、塗料などの製造工程、或いは使用後の容器の洗浄などにより生じる廃液などの着色した染料含有液体を無色に消色し、染料含有液体から主に染料を除去することができ、染料含有液体を消色したのちにその液体を廃棄することにより、河川の汚濁などの環境破壊を防止することができる。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a colorless dye-containing liquid such as a waste liquid generated by a manufacturing process of a dyeing liquid, a writing ink, an ink-jet ink, a printing ink, a paint, or a container after use, or the like. The present invention relates to a method for decoloring a dye-containing liquid, which mainly removes dye from the liquid.
[0002]
[Prior art]
A waste liquid containing a dye is generated in a manufacturing process of a dyeing liquid, a writing ink, an inkjet ink, a printing ink, a paint, or the like, or washing of a container after use.
Dye-containing liquids such as waste liquids are left as they are in the natural environment, or are discarded, or packed in containers, requested to be treated by a waste liquid supplier, and disposed of at a disposal site designated by the supplier. When the dye-containing liquid discarded and discharged into a river or the like while being colored, there is a problem that the river is mainly polluted by the dye and the environment is destroyed.
[0003]
[Problems to be solved by the invention]
Therefore, an object of the present invention is to solve such problems, and to dye dyes, writing inks, ink-jet inks, printing inks, colored dyes such as waste liquids generated by washing the containers after use, or washing the containers after use. It is an object of the present invention to provide a method for decolorizing a dye-containing liquid, which decolorizes a liquid containing the colorless color and mainly removes the dye from the liquid containing the dye.
[0005]
[Means for Solving the Problems]
The above object of the present invention is achieved by a method for decolorizing a dye-containing liquid, wherein an oxidizing agent and a reducing agent act on the dye-containing liquid. Further, the above object of the present invention is achieved by a method for decolorizing a dye-containing liquid, which comprises causing an oxidizing agent and an adsorbent to act on the dye-containing liquid.
[0006]
The above object of the present invention is achieved by a method for decolorizing a dye-containing liquid, wherein an oxidizing agent, a reducing agent and an adsorbent act on the dye-containing liquid .
[0007]
According to the method for decolorizing a dye-containing liquid of the present invention, it is possible to mainly remove the dye from the dye-containing liquid, and by discoloring the dye-containing liquid and then discarding the liquid, the pollution of rivers and the like can be reduced. Environmental destruction can be prevented.
[0008]
In order for the oxidizing agent or the oxidizing agent and the reducing agent to act on the dye-containing liquid, for example, the oxidizing agent or the oxidizing agent and the reducing agent are added to the dye-containing liquid and stirred. In some cases, the gas may be blown into the dye-containing liquid.
In order to make the adsorbent act on the dye-containing liquid, for example, the adsorbent is added to the dye-containing liquid, or the dye-containing liquid to which the oxidizing agent or the oxidizing agent and the reducing agent are added, and the mixture is stirred. The liquid containing the dye or the dye-containing liquid to which the oxidizing agent or the oxidizing agent and the reducing agent are added may be passed through the adsorbent-filled container.
[0009]
In the method for decolorizing a dye-containing liquid according to the present invention, the oxidizing agent or the dye-containing liquid to which the oxidizing agent and the reducing agent are added is heated, or the oxidizing agent or the dye-containing liquid to which the oxidizing agent and the reducing agent are added. By irradiating the liquid with light, a dye decomposition reaction by an oxidizing agent or a reducing agent can be promoted.
[0010]
In addition, by using an adsorbent together with an oxidizing agent or an oxidizing agent and a reducing agent, not only the dye but also a decomposition product of the dye can be adsorbed and removed.
Further, by causing the adsorbent to act on the dye-containing liquid under heating or light irradiation of the dye-containing liquid, the dye and the decomposition products of the dye can be more appropriately adsorbed and removed.
The temperature of the heated dye-containing liquid is preferably from 30 ° C to 80 ° C, and the light used for light irradiation is preferably visible light, ultraviolet light, laser light, or the like.
[0011]
Examples of the oxidizing agent include ketone peroxide, hydroperoxide, peroxyester, benzoyl peroxide, ozone, organic peroxides such as hydrogen peroxide, sodium hypochlorite, potassium hypochlorite, bleached powder, and the like.
Examples of the adsorbent include activated carbon, carbon black, clay, clay, calcium carbonate, barium carbonate, titanium oxide, inorganic materials such as zinc oxide, ion exchange resins, polymer adsorbents, and millipores (filters) obtained by processing them. .
[0012]
Those usually used as reducing agents include hydrogen, hydrogen iodide, hydrogen sulfide, aluminum hydride, relatively unstable hydrogen compounds such as sodium borohydride, and lower grades such as carbon monoxide and sulfur dioxide. Oxides or salts of lower chloric acid, sulfur compounds such as sodium sulfide, sodium polysulfide, and ammonium sulfide; alkali-metals, highly electropositive metals such as magnesium, calcium, aluminum, and zinc; aldehydes, sugars, formic acid, and oxalate Organic compounds having a low oxidation stage such as acids.
[0013]
The dye of the dye-containing liquid is a dye usually contained in a dyeing liquid, writing ink, inkjet ink, printing ink, paint, and the like. I. Direct Yellow 24, 26, 33, C.I. I. Direct Red 2, 20, 24, 28, 39, 75, C.I. I. Direct dyes such as Direct Blue 86, 90 and 120; I. Add Yellow 3, 7, 17, 36, C.I. I. Acid dyes such as Acid Red 8, 6, 14; I. Basic dyes such as Basic Violet 3,1, as well as mordants, azoic vat dyes, disperse dyes, and reactive dyes.
[0014]
【Example】
Hereinafter, the present invention will be described in detail with reference to examples.
First, a water-based paint and a water-based ink were manufactured as follows.
1) Production of water-based paint 100 parts by weight of C.I. I. To Direct Yellow 24, 50 parts by weight of polyvinyl alcohol, 50 parts by weight of ethylene glycol, and 200 parts by weight of water were added and dispersed by a ball mill for 24 hours to produce an aqueous paint.
[0015]
2) Production of aqueous ink (inkjet ink) 50 parts by weight of C.I. I. Direct Red 28, 30 parts by weight of glycerin, 5 parts by weight of nonionic surfactant and 85 parts by weight of ion-exchanged water were thoroughly stirred in a flask, and then filtered to produce an aqueous ink.
[0016]
Example 1
5 g of the aqueous coating material of the above Production Example 1) was placed in a beaker, and 95 g of water was added to dissolve the solution. Then, 0.01 g of sodium hypochlorite was added as an oxidizing agent, followed by stirring to perform a decolorizing treatment.
[0017]
Example 2
5 g of the aqueous coating composition of the above Production Example 1) was placed in a beaker, dissolved in 95 g of water, and 3.0 g of carbon black was added as an adsorbent, stirred, filtered, and subjected to a decolorizing treatment.
[0018]
Example 3
5 g of the aqueous paint of the above Production Example 1) was placed in a beaker, and 95 g of water was added to dissolve it. Then, 0.01 g of sodium hypochlorite and 0.001 g of zinc powder as an adsorbent were added, followed by stirring, followed by filtration and decolorization. Processing was performed.
[0019]
Example 4
5 g of the aqueous paint of the above-mentioned Production Example 1) was placed in a beaker, dissolved in 95 g of water, and then 0.01 g of sodium hypochlorite and 1.0 g of carbon black were added. Was.
[0020]
Example 5
5 g of the aqueous paint of the above Production Example 1) was placed in a beaker, and 95 g of water was added to dissolve the solution. 0.01 g of sodium hypochlorite, 0.0001 g of zinc powder and 0.5 g of carbon black were added, and the mixture was stirred for 2 hours and filtered. A decoloring process was performed.
[0021]
Example 6
In Example 1, a decolorizing treatment was carried out in the same manner as in Example 1 except that 5 g of the aqueous coating material was placed in a beaker, and a solution prepared by adding 95 g of water and heating was heated to 60 ° C.
[0022]
Example 7
Example 2 Example 2 was repeated except that 5 g of the water-based paint was placed in a beaker, 3.0 g of carbon black was added as an adsorbent while irradiating sunlight for 60 minutes with a solution of 95 g of water dissolved therein, and then filtered. A decoloring process was performed in the same manner as described above.
[0023]
Example 8
In Example 3, a decolorizing treatment was performed in the same manner as in Example 2 except that 5 g of the aqueous coating material was placed in a beaker, and a solution prepared by adding 95 g of water and heating was heated to 60 ° C.
[0024]
Examples 9 to 15
In Examples 1 to 7, the decolorizing treatment was performed in the same manner as in Examples 1 to 7, except that the aqueous ink of Production Example 2) was used instead of the aqueous paint of Production Example 1).
[0025]
Example 16
5 g of the aqueous coating composition of the above Production Example 2) was placed in a beaker, and 95 g of water was added to dissolve the same. 0.01 g of acid soda and 0.001 g of zinc powder as an adsorbent were added, and the mixture was stirred, filtered and subjected to a decoloring treatment.
[0026]
In Examples 1 to 16, the colors before and after the decolorizing treatment were visually observed, and the solid content (% by weight) and the transmittance (%) were measured. The solid content was dried at 50 ° C. for 6 hours and determined by a weight loss method. The transmittance was measured using a SEP-T transmittance meter (manufactured by Nippon Seimitsu Co., Ltd.) with the transmittance of water being 100%. The results are shown in Table 1 below.
[0027]
[Table 1]

[0028]
As is clear from the results in Table 1, the dye-containing liquid after the decolorizing treatment is colorless or almost colorless and has a high transmittance, and can mainly decompose and remove the dye from the dye-containing liquid. In particular, the method of heating the dye-containing liquid is excellent in the decoloring effect, and the use of the adsorbent also removes the dye, the decomposition product of the dye, and other substances.
[0029]
【The invention's effect】
According to the present invention, a dyeing liquid, a writing ink, an inkjet ink, a printing ink, a production process of a paint or the like, or a colored dye-containing liquid such as a waste liquid generated by washing a container after use is colorlessly erased, The dye can be mainly removed from the dye-containing liquid, and the destruction of the dye-containing liquid followed by disposal of the liquid can prevent environmental destruction such as pollution of rivers.

Claims (3)

A method for decolorizing a dye-containing liquid, wherein an oxidizing agent and a reducing agent act on the dye-containing liquid. A method for decolorizing a dye-containing liquid, wherein an oxidizing agent and an adsorbent act on the dye-containing liquid. A method for decolorizing a dye-containing liquid, comprising allowing an oxidizing agent, a reducing agent, and an adsorbent to act on the dye-containing liquid.