The oxidizing and reducing bleaching agent in textile:
Bleaching can be divided into two types based on the use of bleaching agents. https://bdfabric.com/cotton-dyeing-by-reactive-dye-continuous-method/ there are two types of bleaching agents. E.g.
2. Reducing bleaching agent
Table of Contents
1. Oxidizing bleaching agent:
The process of bleaching with oxidizing agents is called oxidizing bleaching.
Chemicals that react with other substances to increase oxygen or increase the electronegativity, or release hydrogen from other substances, or decrease the electromagnetic positive part, increase the viscosity of the corresponding element is called an oxidizing agent. E.g.
- 2Fe + 302 = 2Fe2O3
Ferric oxide (Fe2O3) is produced by the reaction of heated iron and oxygen. Here iron is oxidized by oxygen to produce ferric oxide (Fe2O3).
- H2S + Cl2 = 2HCl + S
Hydrogen sulfide (H2S) and chlorine produce hydrochloric (HCl) gas and sulfur.
Here hydrogen sulfide is oxidized and converted to sulfur as a result of the removal of the hydrogen atom from hydrogen sulfide by a chlorine atom.
Examples of oxidizing agents:
Oxygen (O2), ozone (O3), hydrogen peroxide (H2O2), salts, halogen (x2), manganese dioxide(MnO2), Lead Dioxide (Pbo2), Concentrated Sulfuric Acid (H2SO4), Nitric Acid (HNO3), Hype ChlorousAcid (HCIO), Potassium Hype Chloride (KCIO), Potassium Nitrate (KNO3), Potassium Dichromate (K2Cr2O7), Sodium Peroxide (Na2O2), Potassium Sulphate (K2SO4), potassium phosphate (K2Po4), etc.
2. Reducing bleaching agent:
The bleaching process that is done with the help of a reducing agent is called reducing bleaching.
A chemical substance that removes or releases oxygen from another substance during a reaction, or reduces the electronegative part, or increases the addition of hydrogen to another substance, or increases the electromagnetic positive part, thereby reducing the viscosity of the corresponding element. E.g.
- CuO + H2 = Cu + H2O
Metallic copper is produced by heating cupric oxide (CuO) with hydrogen. Copper (Cu) is produced as a result of the removal of oxygen at high heat from the degradable CuO.
HgCl2 + Cl2 = Hg2Cl2
mercuric chloride and mercury (Hg) metals are well decomposed in peas to form mercuric chloride.
Examples of reducing agents:
Hydrogen (H2), carbon (C), carbon monoxide (Co), hydrogen sulfide (H2S), sulfur dioxide (SO2) ferrous sulfate (FeSO4), tetanus chloride (TiCl2), Zinc oxide (ZnO), sodium sulfate (Na2SO4), hydroiodic acid (HI) and metals.
Oxidizing and reducing bleaching agent in textile. Among the aforementioned oxidizing and reducing agents there is a great demand for work in wet processes such as dyeing and printing. There are some agents which are very expensive to use in bleaching. Some reagents can be used but they damage the fiber. Again some reagents cannot completely bleach the fiber.
Reducing agents are used only for protein fiber bleaching. Bleaching of any type of fiber can be done by oxidizing the bleaching agent for bleaching vegetable fibers in general.