ALKALINE PULPING OF PREHYDROLYSED WHEAT-STRAW IN AQUEOUS-ORGANIC SOLVENT SYSTEMS AT LOW-TEMPERATURES

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Title

ALKALINE PULPING OF PREHYDROLYSED WHEAT-STRAW IN AQUEOUS-ORGANIC SOLVENT SYSTEMS AT LOW-TEMPERATURES (EN)

Creator

KOULLAS, DP (EN)

PAPATHEOPHANUS, MG (EN)

KOUKIOS, EG (EN)

Type

journalArticle (EN)

Partial document
Publication in journal (EN)

Article
Scientific article (EN)

Issued

2014-03-01T01:43:49Z

1995 (EN)

Year

1995 (EN)

Description

The effects of partial hemicelluloses fractionation by prehydrolysis on low-temperature organosolv pulping of wheat straw were examined. Prehydrolysis took place at 100 degrees in 1.43 N H2SO4 for 10-40 min. The pretreated material ras delignified in NaOH-containing (5-25% w/w dry solid basis) ethanol-water mixtures (35-100% v/v ethanol concentration). Optimal prehydrolysis, i.e. 30% hemicellulose removal, combined with pulping in 65% (v/v) EtOH were found to significantly, i.e. 8-25%, increase pulp mechanical properties. In addition, very high (95%) cellulose retention in the pulp and high delignification values (86%) were achieved at 55% overall yield. The selectivity of lignin vs. carbohydrate removal during delignification was doubled by the application of a prehydrolytic stage prior to pulping. (EN)

Scientific field

Materials Science, Paper & Wood (EN)

Engineering and Technology ▶ Materials Engineering
Paper and wood (EN)

Subject

ORGANOSOLV (EN)

Journal

CELLULOSE CHEMISTRY AND TECHNOLOGY (EN)

Language

English

Publisher

EDITURA ACADEMIEI ROMANE (EN)

Provider