New Technology Achieves Zero Emission Polyester Material Supercritical CO2 Anhydrous Dyeing and Industrialization

2021-07-21


At present, the annual discharge of textile wastewater in China is 2.5 billion tons (approximately 230 West Lake volumes), of which 2 billion tons are discharged from printing and dyeing wastewater. Due to the dependence of traditional printing and dyeing on water resources and environmental issues caused by wastewater discharge, the sustainable development of the industry is constrained. Therefore, there is an urgent need to develop a low water or anhydrous dyeing technology to solve the bottleneck problem of the development of the printing and dyeing industry from the source.
As early as 2014, Jifa Group began the industrialization research and application of supercritical CO2 anhydrous dyeing technology through industry university research cooperation, continuously improving and improving the anhydrous dyeing technology, solving multiple key technical problems affecting industrial production such as equipment, process, and testing, overcoming the bottleneck of professional components, and achieving the full chain industrialization mode of "science technology engineering industry market" and continuous normal operation of equipment. In 2017, the construction of the world's first 1200L anhydrous dyeing industrial demonstration production line with independent intellectual property rights began, achieving continuous and normal operation of the equipment. Multiple dyes suitable for supercritical CO2 anhydrous dyeing of polyester tube yarns were tested, and more than 30 patents have been applied, laying a solid foundation for industrial application.
The technical principle of the supercritical CO2 anhydrous dyeing project for polyester materials used in textiles is to place the dye and the dye into the dye kettle and the dyeing kettle respectively. During dyeing, the liquid CO2 is transformed into a supercritical state through a heating and pressure system, and then enters the dye kettle to fully contact the dye; The supercritical CO2 fluid passes through a dyeing kettle containing the dye to achieve the adsorption, diffusion, and fixation process of the dye; Complete staining after multiple cycles. After dyeing, CO2 is depressurized and separated from the untreated dye in the separation kettle. The excess dye remains in the separation kettle, and CO2 is liquefied through the condenser and recycled into a storage tank for reuse. Wan Gang, Deputy General Manager of Jifa Group, introduced that the implementation of the industrialization project of supercritical CO2 anhydrous dyeing technology for textile polyester materials conforms to the national "13th Five Year Plan" and belongs to the high-tech field supported by the state. It plays a positive role in comprehensively promoting the construction of a resource-saving society, creating resource-saving and environmentally friendly enterprises, and vigorously developing efficient, energy-saving, environmentally friendly, and recyclable new manufacturing processes and equipment.
The implementation of the industrialization project of supercritical CO2 anhydrous dyeing technology for polyester materials used in textiles belongs to the high-tech field supported by the state. It plays a positive role in promoting the construction of a conservation-oriented society, creating resource-saving and environmentally friendly enterprises, and vigorously developing efficient, energy-saving, environmentally friendly, and recyclable new manufacturing processes and equipment

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