Alkaline sulphite pulping of Caucasian spruce (Picea orientalis L.) chips with additions of NaBH4 and Ethanol

• Autorzy: Erişir E. , Gümüşkaya E. , Kirci H. , Misir N.

Identyfikatory

DOI

10.12841/wood.1644-3985.067.07

• Języki publikacji: EN

Abstrakty

EN

The study determined and compared the yield, viscosity, and chemical and physical properties of the pulps obtained as a result of Alkaline Sulfite–Anthraquinone (AS-AQ) pulping of Caucasian spruce wood with and without the addition of sodium borohydride (ASAB process) and ethanol (ASAE). It was found that the addition of ethanol to the AS-AQ pulping had a favourable influence on the screened yield and kappa number of the pulps. The addition of NaBH4 to the AS-AQ pulping in general also had a favourable influence on these pulps’ indices, provided that the amount added was not higher than 1–2% and the time of pulping was 180 mins. The higher yield of the ASAE pulps resulted from the higher retention of both cellulose and hemicelluloses, while the higher yield of ASAB pulps resulted from the higher retention of hemicelluloses and lignin. Regarding the AS-AQ pulping conditions, a distinct negative effect of modification on the viscosity of the pulps was observed in the case of the NaBH4 a additions to this pulping process. The viscosity reduction was, however, lower with extended pulping time. The static strength properties (tensile index and burst index) of the ASAB and ASAE pulps were in general lower than the AS-AQ pulps. In the case of the tear index, the tendency was similar. The addition of ethanol and especially NaBH4 to the AS-AQ pulping had a distinctly unfavourable influence on the whiteness and brightness of the pulps.

Słowa kluczowe

EN

spruce wood; alkaline-sulfite-anthraquinone pulping; additives; sodium borohydride; ethanol; pulp evaluation

• Wydawca: Sieć Badawcza Łukasiewicz - Poznański Instytut Technologiczny
• Czasopismo: Drewno : prace naukowe, doniesienia, komunikaty
• Rocznik: 2015
• Tom: vol. 58, nr 194
• Strony: 89--102
• Opis fizyczny: Bibliogr. 52 poz., rys., tab.

Twórcy

autor

Erişir E.

• Department of Pulp and Paper Technology, Karadeniz Technical University, Trabzon, Turkey

autor

Gümüşkaya E.

• Department of Pulp and Paper Technology, Karadeniz Technical University, Trabzon, Turkey

autor

Kirci H.

• Department of Pulp and Paper Technology, Karadeniz Technical University, Trabzon, Turkey

autor

Misir N.

• Department of Forest Engineering, Karadeniz Technical University, Trabzon, Turkey

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• List of standards
• ISO 2470-1:2009 Paper, board and pulps - Measurement of diffuse blue reflectance factor – Part 1: Indoor daylight conditions (ISO brightness)
• ISO/CD 5631:2009 Paper and board - Determination of colour by diffuse reflectance – Part 1: Indoor daylight conditions (C/2 degrees).
• ISO/DIS 11476 Paper and board – Determination of CIE whiteness, C/2° (indoor illumination conditions)
• SCAN cm 15:88:1988 Viscosity of Cellulose in Cupperethylenediamine Solution (CED)
• SCAN-C 19:65:1964 Drainability of pulp by the Schopper Riegler Method
• TAPPI T200 sp-10:2010 Laboratory Beating of Pulp (Valley Beater Method)
• TAPPI T203 cm-09:2009 Alpha, Beta and Gamma-Cellulose in Pulp
• TAPPI T204 cm-07:2007 Solvent Extractives of Wood and Pulp
• TAPPI T207 cm-08:2008 Water Solubility of Wood and Pulp
• TAPPI T210 cm-03:2003 Sampling and Testing Wood Pulp Shipments for Moisture
• TAPPI T212 om-12:2012 One Percent Sodium Hydroxide Solubility of Wood and Pulp
• TAPPI T222 om-11:2011Acid-Insoluble Lignin in Wood and Pulp
• TAPPI T236 om-06:2006 The kappa number of Pulp
• TAPPI T257 cm-12:2012 Sampling and Preparing Wood for Analysis
• TAPPI T403 om-10:2010 Bursting Strength of Paper
• TAPPI T414 om-12:2012 Internal Tearing Resistance of Paper (Elmandorf Type Method)
• TAPPI T429 cm-10:2010 Alpha-Cellulose in Pulp
• TAPPI T494 om-01:2006 Tensile Properties of Paper and Paperboard (Using Constant Rate of Elongation Apparatus)