Mixed hardwood chips were treated with lignin-degrading fungi to study the effect of fungal pretreatment on bleaching characteristics of kraft pulp. Pretreated wood chips were subjected to reduced active alkali doses in comparison to untreated chips. Comparable results were obtained for pretreated chips with reduced alkali dose as was obtained with higher dose of alkali in case of untreated chi...

In this thesis, size-exclusion chromatography (SEC) of wood polymers dissolved in lithium chloride/N,N-dimethylacetamide (LiCl/DMAc) has been used to characterize the molar mass distributions (MMD) of wood polymers in pulp fibers after chemical degradation. Characterization of birch kraft pulps subjected to ozone degradation and acid hydrolysis, respectively, rendered different changes in the M...

Recent work by Biegler (8) has investigated optimization techniques for sequential, modular flow sheet simulators. This work extends that effort. Successive linear programming coupled with a reduced gradient method gave fast, reliable optimization. A kraft pulping process involving 22 modules and 50 streams was optimized. Compared to the base case, significantly improved operating points were l...

The use of chemithermomechanical (CTMP) pulp from rapeseed residues as raw material for the manufacturing of linerboard and fluting medium grades was investigated. For this purpose, different alternatives for improving mechanical and optical properties of rapeseed CTMP were studied, and the addition of nanofibrillated cellulose (NFC) was proposed to decrease the intensity of the beating process...

2 aCknowledgements This framework has been developed by the Confederation of European Paper Industries (CEPI, see www.cepi.org). Through its 17 member countries* CEPI represents 800 pulp, paper and board producing companies across Europe, ranging from small and medium sized companies to multi-nationals, and 1,200 paper mills. The European paper industry is one of the most competitive and sustai...

Corn stalk, an agricultural waste, was valorized by the production of cellulose nanofibers (CNF), which were tested for improving recycled paper properties. CNF from eucalyptus kraft pulp (E-CNF) was used as a reference. Addition of 0.5% wt. CNF produced from corn organosolv pulp (C-CNF) to recycled paper increased the tensile index by 20%, whereas the same improvement with E-CNF was achieved a...

Water-soluble sulfonated cellulose (SC) samples were synthesized by oxidizing hardwood kraft pulp with sodium periodate followed by the sulfonation reaction with sodium bisulfite. Six levels of oxidation/sulfonation were obtained by using different mmols (0.93-4.67) of periodate per gram of pulp. The aldehyde and sulfonic acid contents, surface morphology, and water solubility property of these...

Pulp merupakan bahan dasar dalam pembuatan kertas, dimana sebagian besar produksinya mengunakan kayu. Penelitian ini bertujuan untuk mengidentifikasi ampas tebu sebagai baku pulp yang ditinjau dari pengaruh jenis bleacher dan lama waktu pemasakan. Jenis digunakan ialah H2O2 NaClO pemasakan yaitu 30 menit, 60 menit 90 dengan proses soda. Hasil penelitian menunjukan adanya penggunaan menghasilkan...

Cellulose nanofibers can be produced using a combination of TEMPO, sodium bromide (NaBr) and sodium hypochlorite, and mechanical dispersion. Recently, this process has been the subject of intensive investigation. However, studies on the aspects of mechanical treatment of this process remain marginal. The main objective of this study is to evaluate the high shear dispersion parameters (e.g., con...