Comparative study of the chemical components of Pinus taeda wood in kraft pulping
DOI:
https://doi.org/10.5902/1980509893109Keywords:
Chemical components, Cellulose yield, Pulp qualityAbstract
This study aimed to produce kraft pulps from Pinus taeda wood and evaluated the efficiency of the pulping process based on pulp quality, considering the chemical composition of its components. Industrial wood chips of P. taeda, approximately 16 years old, from commercial plantations of a pulp and paper company in Santa Catarina, Brazil, were used. The chips were classified manually to eliminate oversized ones with the aid of a sieve, and subsequently eliminate knots and fines. For the chemical analyses of the wood, part of the chips was converted into sawdust using a Willey-type mill. The kraft pulping was carried out in a 20-liter capacity electrically heated rotary laboratory digester (Regmed). The physicochemical analyses of the wood and brown kraft pulp included: moisture, ash, total extractives, lignin, holocellulose, and alpha-cellulose. The contents of chemical components (extractives, Klason lignin, holocellulose, alpha-cellulose, and ash) retained in the pulp and removed from the wood during cooking were determined. P. taeda wood presented chemical characteristics favorable for kraft pulp production, notably due to its low contents of total extractives (3.76%) and lignin (27.76%) and its high carbohydrate content (holocellulose de 59.61% e alpha-cellulose de 50.66%). Furthermore, its potential use as raw material for brown kraft pulp production is evident.
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