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Enhancement of eucalypt pulp yield through extended impregnation cooking
Univ Fed Vicosa, UFV, Dept Forestry Engn, BR-36570900 Vicosa, MG, Brazil..
Univ Fed Vicosa, UFV, Dept Forestry Engn, BR-36570900 Vicosa, MG, Brazil..
Univ Fed Vicosa, UFV, Dept Forestry Engn, BR-36570900 Vicosa, MG, Brazil..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
2018 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 33, no 2, p. 175-185Article in journal (Refereed) Published
Abstract [en]

The improvement caused by eucalypt chip impregnation on kraft pulping performance was assessed for terminating the cook at kappa in the range of 15-27 and at controlled residual effective alkali (REA) of 6-8 g/L NaOH. Extended impregnation cooking of eucalypt chips (EIC) increased about 10/0 lignin- and HexA-free screen yield gains in relation to conventional cooking (CC), regardless of kappa number in the range of 15-27. The EIC technology allows for cooking eucalypt wood to kappa number up to 27, without rejects production, but without significant improvement in lignin- and HexA-free screen yield and with larger chlorine dioxide (ClO2) consume during bleaching. The optimum kappa number for both CC and EIC cooking was about 19 with similar refinability and strength properties for both technologies, CC and EIC. It was concluded that extended impregnation cooking is an attractive technique for enhancing bleached eucalypt Kraft pulp yield.

Place, publisher, year, edition, pages
AB SVENSK PAPPERSTIDNING , 2018. Vol. 33, no 2, p. 175-185
Keywords [en]
controlled residual effective alkali (REA), conventional cooking (CC), extended impregnation cooking (EIC), lignin- and HexA-free screen yield
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-240028DOI: 10.1515/npprj-2018-3032ISI: 000450922400002Scopus ID: 2-s2.0-85050166587OAI: oai:DiVA.org:kth-240028DiVA, id: diva2:1269256
Note

QC 20181210

Available from: 2018-12-10 Created: 2018-12-10 Last updated: 2018-12-10Bibliographically approved

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de Carvalho, Danila Morais

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