Comparison of Different Chemical Pulps from Wheat Straw and Bleaching with Xylanase Pre-Treated ECF Method

Authors : Saim ATEŞ, Celil ATİK, Yonghao NI, Esat GÜMÜŞKAYA

Pages : 561-570

View : 19 | Download : 9

Publication Date : 2008-12-01

Article Type : Research Paper

Abstract :Different pulping processes, kraft-anthraquinone insert ignore into journalissuearticles values(AQ);, bio-kraft, soda-AQ, ALCELL, and FORMACELL were studied for wheat straw. Fungal pre-treatment with Ceriporiopsis subvermispora, white rot fungi, was applied to wheat straw before kraft-AQ pulping, the so-called bio-kraft process. Fiber properties, carbohydrate contents, FT-IR analyses, strength properties of resultant paper, and bleachability characteristics were included to determine the properties of these pulp samples. In addition, the effects of the xylanase pre-treatment on the subsequent Elemental Chlorine Free insert ignore into journalissuearticles values(ECF); bleaching process were investigated. The results indicated that kraft-AQ pulps from wheat straw exhibited better characteristics than the other pulp samples with lower kappa number, higher carbohydrate content, higher paper strength properties, and better bleachability. The highest kappa number, viscosity, and fiber coarseness were found for organosolv pulp samples; however, these pulps had the lowest carbohydrate contents and strength values and poor bleaching properties. It was concluded that the fungal pre-treatment of wheat straw with C. subvermispora had a positive effect on the bleachability and gave stronger pulp. There was no clear alteration in the crystallinity index of pulp samples based on the FT-IR results.
Keywords : Wheat straw, biopulping, enzyme prebleaching, organosolv pulping, FT IR