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  • Brännvall, ElisabetRISE,Bioraffinaderi och energi (author)

Increasing pulp yield in kraft cooking of softwoods by high initial effective alkali concentration (HIEAC) during impregnation leading to decreasing secondary peeling of cellulose

  • Article/chapterEnglish2018

Publisher, publication year, extent ...

  • Walter de Gruyter GmbH,2018
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:ri-33965
  • https://urn.kb.se/resolve?urn=urn:nbn:se:ri:diva-33965URI
  • https://doi.org/10.1515/hf-2018-0011DOI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • Pulp yield can be improved by a more homogeneous delignification of the chips, achieved by improved impregnation prior to the cooking stage. Complete and efficient impregnation is obtained by increasing the diffusion rate by means of an impregnation liquor with a high initial effective alkali concentration (HIEAC). In the present study, the effect of HIEAC in the impregnation was evaluated and compared to a reference impregnation procedure and a prolonged impregnation. After the various impregnation scenarios, the alkali concentration was always adjusted to the same level in the beginning of the cooking stage. Impregnation with a HIEAC resulted in yield improvements by 1-1.5% units, due to a higher cellulose yield and possibly also to higher yield of glucomannan. The HIEAC with an even alkali distribution within the chips prior to the cooking stage resulted in a more uniform delignification carbohydrate degradation. Yield increase obtained by uniform delignification is due to both decreased shives content as well as less secondary peeling.

Subject headings and genre

  • chemical composition
  • diffusion
  • high initial effective alkali concentration (HIEAC)
  • homogeneous delignification
  • impregnation
  • kraft pulping
  • molecular mass distribution (MMD)
  • peeling
  • pulp yield
  • softwood
  • Cellulose
  • Delignification
  • Kraft process
  • Kraft pulp
  • Molecular mass
  • Softwoods
  • Alkali concentrations
  • Chemical compositions
  • Diffusion rate
  • Kraft cooking
  • Molecular mass distributions
  • Pulp yields
  • Yield Improvement
  • Yield increase
  • Pulp cooking

Added entries (persons, corporate bodies, meetings, titles ...)

  • RISEBioraffinaderi och energi (creator_code:org_t)

Related titles

  • In:Holzforschung: Walter de Gruyter GmbH72:10, s. 819-8270018-38301437-434X

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