Acetic acid pulping of wheat straw under atmospheric pressure

Atmospheric acetic acid pulping of wheat straw was carried out. Pulping conditions and their effects on pulp properties were investigated in detail, and a comparison between acetic acid (AcOH) pulp and soda-anthraquinone (AQ) pulps of wheat straw was made of the chemical composition, strength, and f...

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Bibliographic Details
Published in:Journal of wood science 1999-08, Vol.45 (4), p.319-325
Main Authors: Pan, X.J. (Tianjin Univ. of Light Industry (China)), Sano, Y
Format: Article
Language:English
Subjects:
ACETIC ACID
ACIDE ACETIQUE
ACIDO ACETICO
Acids
Anthraquinones
Ashes
ATMOSPHERIC PRESSURE
Bonding strength
Catalysis
Catalysts
Cellulose
Cellulose fibers
Chemical composition
Chemical damage
Depolymerization
ELABORACION DE PULPA
Monosaccharides
Morphology
Organic chemistry
PAILLE DE BLE
PAJA DE TRIGO
PASTA
PATE CELLULOSIQUE
PRESION ATMOSFERICA
PRESSION ATMOSPHERIQUE
PULP
PULPING
REDUCTION EN PATE
RESISTANCE MECANIQUE
RESISTENCIA MECANICA
Silicon dioxide
Straw
STRENGTH
Sugar
Sulfuric acid
Wheat
WHEAT STRAW
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Summary:Atmospheric acetic acid pulping of wheat straw was carried out. Pulping conditions and their effects on pulp properties were investigated in detail, and a comparison between acetic acid (AcOH) pulp and soda-anthraquinone (AQ) pulps of wheat straw was made of the chemical composition, strength, and fiber morphology of the pulps. Wheat straw was successfully pulped and fractionated into pulp (cellulose), acetic acid lignin, and sugars (monosaccharides from hemicellulose), making it easy to utilize them. It was found that among the pulping conditions the dosage of H2SO4 as catalyst was the most notable, and the extent and rate of delignification could be controlled by varying the amount of the catalyst. The results also showed that acetic acid pulp was quite different from soda-AQ pulp. About 70% of the ash or 90% of the silica in wheat straw were kept in AcOH pulp. The ash might function as filler and be beneficial to the printability of paper. It was known that many epidermal cells existed in AcOH pulp in bundles or in single cells. These ash-rich nonfiber cells seemed to hinder the bonding between fibers. AcOH pulp had lower strength than soda-AQ pulp, which might result mainly from the chemical damage of fibers caused by acid, not from the depolymerization of cellulose.
ISSN:1435-0211
1611-4663
DOI:10.1007/bf00833497