I want to know except ionic liquids and other solvents combination, which solvent dissolve pure cellulose. Pure cellulose means only cellulose and not its derivatives.
Depends on what you describe as pure cellulose. Do you mean the dissolution of an already extracted crystalline phase that you have obtained yourself, or something else that is stated 'pure'. For the really pure system of cellulose fibrils it is tricky. Maybe this reference will lead you somewhere to alternatives:
"The traditional commercialized viscose process(10) for producing regenerated cellulose products is a derivation approach, which is still the dominating method at present. However, the use of toxic CS2 and the byproducts in the viscose process lead to serious environmental pollution. Therefore, efforts on finding environmental friendly solvents for dissolving cellulose have attracted increasing attention. N,N-dimethylacetamide/lithium chloride (DMAc/LiCl) is a classical and direct solvent system for cellulose and plays a significant role in the history of cellulose science and technology.(15) It has been widely used in the fields of cellulose analysis,(16, 17) shaping,(18, 19) and chemical modification.(20-22)"
Article Dissolution Mechanism of Cellulose in N,N-Dimethylacetamide/...
This book chapter by Tim Liebert also gives very good relevant info:
Cellulose Solvents – Remarkable History, Bright Future
Liebert et al.; Cellulose Solvents: For Analysis, Shaping and Chemical Modification ACS Symposium Series; American Chemical Society: Washington, DC, 2010.
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