Project ForgeChemical Technology
Organic Chemical Industries
GATE 2018
Medium
Choose the CORRECT statement about the viscose rayon manufacturing process.
- carbon disulphide used as reactant for xanthate formation is regenerated in a later step
- Bcaustic soda used as reactant for steeping of cellulose is regenerated in a later step
- Csulphuric acid is used in steeping process of cellulose
- Dthe spun viscose rayon is hardened in an alkali bath
Explanation
CS2 used to form cellulose xanthate is released and recovered when the xanthate decomposes back to cellulose in the acid spinning bath. Sulfuric acid is used in the SPINNING bath (not steeping, which uses NaOH), and the rayon is hardened/coagulated in an ACID bath, not alkali.
Source: GATE CH 2018 (2018)
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