|Project Title||Development of a Laboratory-Scale Electrochemical Mercerization and Bleaching System for Technological Evaluation|
|Project Ref. No.||RD/PR/008/06|
|ITC Ref. No.||ITP/006/07TP|
|Project Coordinator||Dr. Lee Kin YEUNG|
|Deputy Project Coordinator||Mr Raymond Mun Keung CHAN|
|Research Institution||Hong Kong Productivity Council|
|Focus Area||Advanced Textiles and Clothing Production Technology|
|Project Period||03/2007 - 08/2008|
|Total Funding (HK$)||978,000|
The development objective is aimed to provide a laboratory-scale system for ecological bleaching and mercerization process for replacement of the conventional polluting process, which are often employed harmful oxidants such as hypochlorite, hydrogen peroxide or perborates, perphosphates to remove colour from the mercerized cotton fabric. This bleaching process generates large quantities of waste water and require high pollution treatment cost. In addition, the consumption of large amount of bleaches causes high production cost.
The proposed electrochemical process could offer a cleaner production process as it does not need any harmful chemicals. The process offers the advantages of low cost, low power consumption and pollution free. In this electrochemical system which uses a proton exchange membrane to separate the cathode and anode respectively, fabric moves through both the cathode compartment and the anode compartment. In the cathode compartment, oxygen gas is reduced to form the hydroxide and hydrogen peroxide for preliminary bleaching and mercerization of the fabric where the anode will generate the hypochlorite for second stage bleaching. As estimation, the proposed technology would lead to 40% integrated cost reduction due to substantial saving in energy, effluent, and chemicals.
A laboratory-scale electrochemical mercerization and bleaching system will be established for technological evaluation on cotton fabric.
1. A laboratory-scale electrochemical mercerization and bleaching system for technological evaluation on cotton fabric