The Investigations on Pulp and Paper Production with Modified Kraft Pulping Method from Canola (Brassica napus L.) Stalks
Öz
Aim of study: This study was carried out to evaluate
canola (Brassica napus L.) stalks as
an alternative raw material for pulp and paper production.
Area of study: This work was carried out in Kahramanmaraş
Sütçü Imam University, Faculty of Forestry, Pulp and Paper Production
Laboratory.
Material and Methods: Before pulping procedure, the chemical
components of the canola stalks were investigated. The holocellulose, alpha
cellulose, lignin, and ash contents and NaOH (1%) and cold-hot water
solubilities were determined. Modified kraft cooking method was used for
pulping from canola stalk by using sodium borohydride (NaBH4).
Sulfidity charge; 26, 28, 30%, and NaBH4 charge; 0, 0.1, 0.3, 0.5%
were changed while keeping constant temperature (150 oC), time (120
min) and alkali charge (20%). For determination of the optimum pulping condition,
12 cooking experiments were performed to canola stalks. In addition, the
physical and optical properties of the papers produced from the obtained pulps
were also determined.
Main results: The holocellulose (72.10%) and lignin
(13.15%) contents of the canola stalks were found to be similar with hardwoods.
The optimum cooking condition was determined as 20% active alkali, 28%
sulfidity and 0.5% NaBH4 charges (as NaOH) and the total pulp yield
were obtained about 44.7% in this condition. Besides, the addition of NaBH4
increased pulp yield by 24.1% and decreased kappa number by 9.7%.
Research highlights: It was concluded that obtained results
demonstrate the suitability of canola stalk for pulp and paper production and
NaBH4 is an effective cooking additive for the pulp yield.
Anahtar Kelimeler
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