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In viscose rayon manufacturing process,

  1. carbon disulphide used as reactant for xanthate formation is regenerated in a later step
  2. caustic soda used as reactant for steeping of cellulose is regenerated in a later step
  3. sulphuric acid is used in steeping process of cellulose
  4. the spun viscose rayon is hardened in an alkali bath
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