Development survey and outlook of new solvent process regenerated cellulose fibers

From a long-term development point of view,the solvent process regenerated cellulose fibers will radically resolve the collision problem of land occupation between grain and cotton,and become a staple variety of future fiber materials. The production scale of Lyocell fiber will reach about 300 thousand tons per year worldwide in recent years and be in a high speed developing period after quantity production of specialized cellulose pulp and solvent in the future. For alkali/urea aqueous solvents,the key issue is to resolve the problem that the hydrogen bond forms in the coagulating process,which restricts the drawing orientation of the macromolecules. For cellulose carbamate/NaOH aqueous solution system,the technological parameters need to be optimized to reach the level of viscose fibers in performance and technologic and economic indexes. For ionic liquid solvent system,the functional fibers can be developed for the early stage. For phosphoric acid solvent system,stress should be placed on resolving the problems on degradation control and solvent recovery,in order to realize low cost and environmental friendly production.