Dissolving-grade birch pulps produced under various prehydrolysis intensities: Quality, structure and applications

Lidia Testova; Marc Borrega; Lasse K. Tolonen; Paavo A. Penttilä; Ritva Serimaa; Per Tomas Larsson; Herbert Sixta

doi:10.1007/s10570-014-0182-x

Dissolving-grade birch pulps produced under various prehydrolysis intensities: Quality, structure and applications

Lidia Testova
, Marc Borrega
, Lasse K. Tolonen
, Paavo A. Penttilä
, Ritva Serimaa
, Per Tomas Larsson
, Herbert Sixta^*

^*Corresponding author for this work

Not published at VTT

Aalto University
University of Helsinki
RISE Research Institutes of Sweden

Research output: Contribution to journal › Article › Scientific › peer-review

46 Citations (Scopus)

Abstract

Aqueous-phase prehydrolysis followed by alkaline pulping is a viable process to produce wood-based dissolving pulps. However, detailed characterisation of the achievable pulp quality, performance and cellulose structure is yet lacking. In this study, the production of hemicellulose-lean birch soda-anthraquinone pulps after prehydrolysis under various intensities was investigated. Increasing prehydrolysis intensity resulted in pulps of higher purity but lower cellulose yield and degree of polymerisation. Higher cellulose yield by using sodium borohydride during pulping was achieved at the expense of reducing pulp purity. Cellulose crystallinity was similar in all pulps indicating simultaneous degradation of both crystalline and amorphous cellulose regions. Reinforced prehydrolysis seemingly increased the cellulose crystal size and the interfibrillar distances. Moderate intensity prehydrolysis (170 °C) resulted in a pulp well suited for viscose application, whereas reinforced prehydrolysis favoured the production of acceptable cellulose triacetate dope. The performance of the pulps in viscose and acetate applications was strongly related to the chemical and structural properties.

Original language	English
Pages (from-to)	2007-2021
Journal	Cellulose
Volume	21
Issue number	3
DOIs	https://doi.org/10.1007/s10570-014-0182-x
Publication status	Published - Jun 2014
MoE publication type	A1 Journal article-refereed

Funding

Acknowledgments The authors acknowledge Tekes—the Finnish Funding Agency for Technology and Innovation, FIBIC—Finnish Bioeconomy Cluster, BIOREGS—Doctoral Programme for Biomass Refining, Andritz Oy, Danisco Sweeteners Oy, Metsä Fibre Oy, Stora Enso Oyj and UPM for the financial support. Armin Stein and Solvay—Rhodia for the help in establishing the laboratory cellulose acetylation method.

Keywords

Cellulose acetate
Cellulose structure
Dissolving pulp
Macromolecular properties
Prehydrolysis
Viscose

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10.1007/s10570-014-0182-x

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title = "Dissolving-grade birch pulps produced under various prehydrolysis intensities: Quality, structure and applications",

abstract = "Aqueous-phase prehydrolysis followed by alkaline pulping is a viable process to produce wood-based dissolving pulps. However, detailed characterisation of the achievable pulp quality, performance and cellulose structure is yet lacking. In this study, the production of hemicellulose-lean birch soda-anthraquinone pulps after prehydrolysis under various intensities was investigated. Increasing prehydrolysis intensity resulted in pulps of higher purity but lower cellulose yield and degree of polymerisation. Higher cellulose yield by using sodium borohydride during pulping was achieved at the expense of reducing pulp purity. Cellulose crystallinity was similar in all pulps indicating simultaneous degradation of both crystalline and amorphous cellulose regions. Reinforced prehydrolysis seemingly increased the cellulose crystal size and the interfibrillar distances. Moderate intensity prehydrolysis (170 °C) resulted in a pulp well suited for viscose application, whereas reinforced prehydrolysis favoured the production of acceptable cellulose triacetate dope. The performance of the pulps in viscose and acetate applications was strongly related to the chemical and structural properties.",

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note = "Funding Information: Acknowledgments The authors acknowledge Tekes—the Finnish Funding Agency for Technology and Innovation, FIBIC—Finnish Bioeconomy Cluster, BIOREGS—Doctoral Programme for Biomass Refining, Andritz Oy, Danisco Sweeteners Oy, Mets{\"a} Fibre Oy, Stora Enso Oyj and UPM for the financial support. Armin Stein and Solvay—Rhodia for the help in establishing the laboratory cellulose acetylation method. Copyright: Copyright 2014 Elsevier B.V., All rights reserved.",

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doi = "10.1007/s10570-014-0182-x",

language = "English",

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AU - Testova, Lidia

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AU - Tolonen, Lasse K.

AU - Penttilä, Paavo A.

AU - Serimaa, Ritva

AU - Larsson, Per Tomas

AU - Sixta, Herbert

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PY - 2014/6

Y1 - 2014/6

N2 - Aqueous-phase prehydrolysis followed by alkaline pulping is a viable process to produce wood-based dissolving pulps. However, detailed characterisation of the achievable pulp quality, performance and cellulose structure is yet lacking. In this study, the production of hemicellulose-lean birch soda-anthraquinone pulps after prehydrolysis under various intensities was investigated. Increasing prehydrolysis intensity resulted in pulps of higher purity but lower cellulose yield and degree of polymerisation. Higher cellulose yield by using sodium borohydride during pulping was achieved at the expense of reducing pulp purity. Cellulose crystallinity was similar in all pulps indicating simultaneous degradation of both crystalline and amorphous cellulose regions. Reinforced prehydrolysis seemingly increased the cellulose crystal size and the interfibrillar distances. Moderate intensity prehydrolysis (170 °C) resulted in a pulp well suited for viscose application, whereas reinforced prehydrolysis favoured the production of acceptable cellulose triacetate dope. The performance of the pulps in viscose and acetate applications was strongly related to the chemical and structural properties.

AB - Aqueous-phase prehydrolysis followed by alkaline pulping is a viable process to produce wood-based dissolving pulps. However, detailed characterisation of the achievable pulp quality, performance and cellulose structure is yet lacking. In this study, the production of hemicellulose-lean birch soda-anthraquinone pulps after prehydrolysis under various intensities was investigated. Increasing prehydrolysis intensity resulted in pulps of higher purity but lower cellulose yield and degree of polymerisation. Higher cellulose yield by using sodium borohydride during pulping was achieved at the expense of reducing pulp purity. Cellulose crystallinity was similar in all pulps indicating simultaneous degradation of both crystalline and amorphous cellulose regions. Reinforced prehydrolysis seemingly increased the cellulose crystal size and the interfibrillar distances. Moderate intensity prehydrolysis (170 °C) resulted in a pulp well suited for viscose application, whereas reinforced prehydrolysis favoured the production of acceptable cellulose triacetate dope. The performance of the pulps in viscose and acetate applications was strongly related to the chemical and structural properties.

KW - Cellulose acetate

KW - Cellulose structure

KW - Dissolving pulp

KW - Macromolecular properties

KW - Prehydrolysis

KW - Viscose

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EP - 2021

JO - Cellulose

JF - Cellulose

IS - 3

ER -

Dissolving-grade birch pulps produced under various prehydrolysis intensities: Quality, structure and applications

Abstract

Funding

Keywords

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