Enzymatic and alkaline treatment of hardwood dissolving pulp

Leena Rahkamo, Liisa Viikari, Johanna Buchert, T. Paakkari, Tapani Suortti

Research output: Contribution to journalArticleScientificpeer-review

34 Citations (Scopus)

Abstract

Dissolving pulp was solubilized in 9% NaOH, resulting in 32% solubilization of the pulp. Most of the pulp hemicelluloses were solubilized during this treatment. During the alkaline treatment the cellulose crystalline form was converted from cellulose I to cellulose II.
The alkaline insoluble residue was further treated with cellulases in order to render it more alkaline soluble (two-step process). The cellulose II was readily hydrolysed by Trichoderma reesei endoglucanases. Considerably higher hydrolysis yields and lower viscosities were obtained in the hydrolysis of the alkaline insoluble residue as compared with the original pulp.
Compared with direct enzymatic treatment with subsequent solubilization in alkali, the overall alkaline solubility of the two-step process was slightly higher at the same enzyme dosage.
However, when compared at the same hydrolysis levels, slightly lower overall alkaline solubilities were obtained in the two-step method.
Original languageEnglish
Pages (from-to)79-88
JournalCellulose
Volume5
Issue number2
DOIs
Publication statusPublished - 1998
MoE publication typeA1 Journal article-refereed

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Hardwoods
Cellulose
Pulp
Hydrolysis
Solubility
Cellulases
Cellulase
Alkalies
Enzymes
Viscosity
Crystalline materials

Cite this

Rahkamo, L., Viikari, L., Buchert, J., Paakkari, T., & Suortti, T. (1998). Enzymatic and alkaline treatment of hardwood dissolving pulp. Cellulose, 5(2), 79-88. https://doi.org/10.1023/A:1009268713757
Rahkamo, Leena ; Viikari, Liisa ; Buchert, Johanna ; Paakkari, T. ; Suortti, Tapani. / Enzymatic and alkaline treatment of hardwood dissolving pulp. In: Cellulose. 1998 ; Vol. 5, No. 2. pp. 79-88.
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Rahkamo, L, Viikari, L, Buchert, J, Paakkari, T & Suortti, T 1998, 'Enzymatic and alkaline treatment of hardwood dissolving pulp', Cellulose, vol. 5, no. 2, pp. 79-88. https://doi.org/10.1023/A:1009268713757

Enzymatic and alkaline treatment of hardwood dissolving pulp. / Rahkamo, Leena; Viikari, Liisa; Buchert, Johanna; Paakkari, T.; Suortti, Tapani.

In: Cellulose, Vol. 5, No. 2, 1998, p. 79-88.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Enzymatic and alkaline treatment of hardwood dissolving pulp

AU - Rahkamo, Leena

AU - Viikari, Liisa

AU - Buchert, Johanna

AU - Paakkari, T.

AU - Suortti, Tapani

PY - 1998

Y1 - 1998

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AB - Dissolving pulp was solubilized in 9% NaOH, resulting in 32% solubilization of the pulp. Most of the pulp hemicelluloses were solubilized during this treatment. During the alkaline treatment the cellulose crystalline form was converted from cellulose I to cellulose II. The alkaline insoluble residue was further treated with cellulases in order to render it more alkaline soluble (two-step process). The cellulose II was readily hydrolysed by Trichoderma reesei endoglucanases. Considerably higher hydrolysis yields and lower viscosities were obtained in the hydrolysis of the alkaline insoluble residue as compared with the original pulp. Compared with direct enzymatic treatment with subsequent solubilization in alkali, the overall alkaline solubility of the two-step process was slightly higher at the same enzyme dosage. However, when compared at the same hydrolysis levels, slightly lower overall alkaline solubilities were obtained in the two-step method.

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JF - Cellulose

SN - 0969-0239

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Rahkamo L, Viikari L, Buchert J, Paakkari T, Suortti T. Enzymatic and alkaline treatment of hardwood dissolving pulp. Cellulose. 1998;5(2):79-88. https://doi.org/10.1023/A:1009268713757