Project Database

Materials and Systems for Decolorization of PET from Post-consumer Textile

Over the past 10 years, textiles have been the fastest growing waste stream in many countries. The amount and its potential negative impacts on the environment are matters of concern to governments, textile industry and the community. By recycling used clothes and textiles, such problems of pollution and the energy intensive production of new clothing could be avoided. Over 75 % of total fabrics are made of PET or PET/cotton blend. The recent hydrothermal separation system developed from HKRITA has achieved complete separation of PET from the PET/cotton blend. The recycled PET fibers are mostly dyed with disperse dyestuff. Mixtures of recycled PET fibers of different colors cannot be easily mixed or woven together to form new textiles and, therefore, are required to be decolored before processing and re-dyeing. The main idea of this project is to develop suitable materials and systems for decolorization of PET fibers from garment recycling. Specifically, the main objectives of the work are to: 1. Prepare several kinds of materials as dye adsorbents. 2. Develop lab-scale decolorization systems, which are applicable to PET fibers and PET textile pieces. 3. Evaluate the decoloring performance of those adsorbents and decolorization systems as well as the collection efficiency of those adsorbents. 4. Select 1 type of decolorization system and establish the decolorization system in pre-industrial scale (for demonstration trials).


Silver Medal in the 47th International Exhibition of Inventions of Geneva (2019)
Project No. (ITC) ITP/048/18TP
Project Type Platform
Project Co-ordinator Mr. KEH Yee Man, Edwin
Research Institute The Hong Kong Research Institute of Textiles & Apparel Limited
ITF Amount HK$ 14,514,000
Start Date DD/MM/YY 2018-11-01
Completion Date DD/MM/YY 2020-10-31
H&M Hennes & Mauritz (Far East) Ltd
IP Number