It was learned from the Institute of Process Engineering, Chinese Academy of Sciences that the institute has made a breakthrough in the industrial application of its independently developed ionic liquid method for regenerating cellulose fibers. The Shougaisai demonstration project with an annual output of 1,000 tons of new-generation regenerated cellulose fibers has recently been officially put into operation in Henan Province.
This is the world's first large-scale production of cellulose fibers regenerated by the ionic liquid method. Compared with traditional processes, it truly breaks through the bottlenecks of spinning process transformation and environmental protection issues, achieving zero discharge of "three wastes" (wastewater, waste gas, and solid waste).
Regenerated cellulose fibers are made from natural plant cellulose and have the advantages of good moisture absorption, strong air permeability, excellent drape and silk-like luster. Currently, common products in the market include viscose, modal, Lyocell, etc. They have a promising application prospect in the textile field.
The ionic liquid team led by Academician Zhang Suojiang of the Chinese Academy of Sciences from the Institute of Process Engineering, Chinese Academy of Sciences, after more than ten years of continuous research and development, has overcome a series of scientific and technological problems such as the design and preparation of ionic liquids, the dissolution mechanism and spinning process of cellulose, and the recovery and system integration of ionic liquids. Eventually, they have developed new technologies for dissolving cellulose with ionic liquids and green spinning. After small-scale trials, ton-level and hundred-ton-level demonstrations, a new generation of thousand-ton production line for regenerated cellulose fibers was designed and built.
The project team introduced that the officially put into production Shusai demonstration project uses non-volatile and stable ionic liquids as solvents, getting rid of the traditional process's reliance on strong acids, strong alkalis and carbon disulfide. The production process is greener and safer. The fineness, strength, elongation, coefficient of variation of dry elongation at break and other properties of its filament products all meet international standards, and there is no phenomenon of original fiberization. Meanwhile, the ionic liquid solvent recovery technology is simple and can achieve a win-win situation of environmental and economic benefits.
Shousail Fiber
Academician Zhang Suojiang stated that the successful breakthrough of ionic liquid green spinning technology represents a significant technological revolution in the field of green fibers, marking that the cutting-edge technology of ionic liquid spinning has truly evolved from original concept to practical application.
The Shousail demonstration project, which has been officially put into production, is located in the Chemical Fiber Bailu Bio-based New Materials Industrial Park in Xinxiang, Henan Province. According to Xie Yueting, the chief engineer of Xinxiang Chemical Fiber and the director of Bailu New Materials Research Institute, the project has developed a brand-new concept of ionic liquid method for regenerating cellulose filament, achieving zero discharge of wastewater, waste gas and solid waste throughout the entire process. According to estimates, compared with traditional fossil fibers, the application of the new technology can reduce carbon dioxide emissions by 5,000 tons annually, and the solvent recovery rate will be as high as over 99%.
Duan Xiaoping, vice president of the China National Textile and Apparel Council, said that this demonstration project sets a benchmark for the industrialization of new green technologies, can provide new green fiber options for the green and sustainable transformation of the industrial chain, and is an important achievement of the real economy in implementing the "dual carbon" (carbon peak and carbon neutrality) goals. It can significantly enhance the global green competitiveness of China's textile industry. Contribute industrial strength to the construction of ecological civilization.
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