There are headstream pollution problems for the traditional viscose fiber production process

so it is necessary to develop the new solvent process for regenerated cellulose fiber

to be as a staple variety of future fiber materials. In the multitudinous developed solvent systems for cellulose

the solvent system of NMMO (N-methylmorpholine-N-oxide) has been applied into large scale industrial production; the developments of cellulose carbamate

sodium hydroxide or lithium hydroxide/thiourea or sodium zincate or (and) urea/water solution

ionic liquid systems have also made remarkable progresses. In the industrialization technologies of organic solvent process of regenerated cellulose fibers represented by NMMO process

the continuous dissolving technology of film evaporation pushed forward in vacuum has comparison advantages; for spinning methord it is all the dry-jet wet-spinning; the development direction for solvent recovery technology is high efficiency evaporation combined with other energy saving technologies in concentration process; the on-line crosslinking technologies before drying are adopted in large scale productions for the control of fibrillation.