Alkaline steeping of dissolving pulp. Part I: cellulose degradation kinetics

The production of cellulosic man made fibres by the viscose process has been known for more than 120 years but still some aspects are not sufficiently understood in detail

Danuta Joanna Mozdyniewicz; Kaarlo Nieminen; Herbert Sixta

2013

Scholarcy highlights

  • The production of cellulosic man made fibres by the viscose process has been known for more than 120 years but still some aspects are not sufficiently understood in detail
  • The carbohydrates in the pulp are exposed to varying conditions during the manufacturing process
  • In the first production step of steeping, the strong alkaline treatment leads to undesirable loss reactions of the cellulose
  • A comprehensive kinetic model was developed for process simulation of cellulose degradation for the fist time comprising primary and secondary peeling, stopping and alkaline hydrolysis
  • The peeling-off reaction was of great significance for the cellulose yield loss, due to a contribution of the secondary peeling after random chain scission
  • Already short alkaline treatment times favored the dissolution of fibril fragments from the fibre surface leading to a smooth fibre surface

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