Novel concepts of dissolving pulp production

Herbert Sixta (Corresponding Author), Mikhail Iakovlev, Lidia Testova, Annariikka Roselli, Michael Hummel, Marc Borrega, Adriaan van Heiningen, Carmen Froschauer, Herwig Schottenberger

Research output: Contribution to journalReview Articlepeer-review

144 Citations (Scopus)


Herein, we report about existing and novel dissolving pulp processes providing the basis for an advanced biorefinery. The SO2–ethanol–water (SEW) process has the potential to replace the acid sulphite process for the production of rayon-grade pulps owing to a higher flexibility in the selection of the raw material source, substantially lower cooking times, and the near absence of sugar degradation products. Special attention is paid to developments that target toward the selective and quantitative fractionation of paper-grade pulps into hemicelluloses and cellulose of highest purity. This target has been accomplished by the IONCELL process where the entire hemicellulose fraction is selectively dissolved in an ionic liquid in which the H-bond basicity and acidity are adequately adjusted by the addition of a co-solvent. At the same time, pure hemicellulose can be recovered by further addition of the co-solvent, which then acts as a non-solvent. The residual pure cellulose fraction may then enter a Lyocell process for the production of regenerated cellulose products.
Original languageEnglish
Pages (from-to)1547-1561
Number of pages15
Issue number4
Publication statusPublished - 17 May 2013
MoE publication typeA2 Review article in a scientific journal


  • Acid sulfite pulp
  • Cold caustic extraction
  • Dissolving pulp
  • Ioncell process
  • Ionic liquids
  • Prehydrolysis-Kraft pulp


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