Question
Write the preparation of viscose rayon.
✓
Answer
Viscose rayon is a semisynthetic fibre. It is a regenerated cellulose. The molecular formula of cellulose is $\left( C _6 H _{10} O _5\right)_{\text {n }}$. A modified representation of the molecular formula of cellulose $Cell - OH$ is used in the reactions involved in viscose formation.
Cellulose (wood pulp) is treated with the concentrated $NaOH$ to form alkali cellulose. It is then converted to xanthate by treating with $CS _2$. Further xanthate is mixed with dilute $NaOH$ to form viscose solution which is extruted through spinnerates of spinning machine into acid bath, whe regenerated cellulose fibres precipitate, i.e. viscose rayon.
Cellulose (wood pulp) is treated with the concentrated $NaOH$ to form alkali cellulose. It is then converted to xanthate by treating with $CS _2$. Further xanthate is mixed with dilute $NaOH$ to form viscose solution which is extruted through spinnerates of spinning machine into acid bath, whe regenerated cellulose fibres precipitate, i.e. viscose rayon.
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