TE-316: Textile Chemical Processes-I Bleaching of Cotton with Hydrogen Peroxide Muhammad Zubair Lecturer TE-316: Textile Chemical Processes-I General Bleaching agent: H 2 O 2 35 or 50 % (Redox potential: 810-840 mV) Molecular mass: 34 g/mol Powerful oxidizing agent and can cause combustion. Storage Heavy metals pH value Conc. of H 2 O 2 Temperature Influence of light Activation by temperature, alkali, impurities Muhammad Zubair Lecturer 2 TE-316: Textile Chemical Processes-I Hydrogen Peroxide Bleaching Available commercially as a stabilized liquid of pH 4.5-5.5. Requires activation to produce a bleaching effect. Temperature controls the bleaching action. Bleaching best carried out at pH 10.5-11. Muhammad Zubair Lecturer 3 TE-316: Textile Chemical Processes-I Hydrogen Peroxide Bleaching Stability and consistency of supply Permanent white Environmental friendly Versatility of application Fibre damage Quality of whiteness Cost-effectiveness Muhammad Zubair Lecturer Advantages Disadvantages 4