Abstract: As an important sector of the textile industry, dyeing processing is an important step in the textile production chain for deep processing of products to improve their quality, function and value, and also important technical support for industries such as high value-added clothing, home textiles and technical textiles. Though the problem of wastewater discharge which has been perplexing the dyeing industry has been alleviated, it has not been fundamentally solved yet. The negative image of environmental pollution is still growing. As China’s new original dyeing technology, non-aqueous dyeing is expected to be the answer for large sewage discharge and serious dye waste from the dyeing of hydrophilic fiber textiles such as cotton fiber. This paper introduces the key technologies of dyeing in the non-aqueous dyeing system with reactive dyes, including the definition and applicability of non-aqueous dyeing, basic requirements of dyeing medium, basic principles of non-aqueous medium dyeing, as well as basic performance, industrialization demonstration and promotion of non-aqueous medium dyeing technology of cotton fiber. In doing so, the paper provides a new direction for the sustainable development of China’s textile industry and towards a comprehensive ecologicalization.

Key words: non-aqueous medium dyeing; zero discharge of wastewater; reactive dyes; cotton fiber