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Lignin carbohydrate complex studies during kraft pulping for producing paper grade pulp from birch, TAPPI Journal September 2020
ABSTRACT: Paper grade pulp production across the globe is dominated by the kraft process using different lignocellulosic raw materials. Delignification is achieved around 90% using different chemical treatments. A bottleneck for complete delignification is the presence of residual covalent bonds that prevail between lignin and carbohydrate even after severe chemical pulping and oxygen delignification steps. Different covalent bonds are present in native wood that sustain drastic pulping conditions. In this study, 100% birch wood was used for producing paper grade pulp, and the lignin carbohydrate bonds were analyzed at different stages of the kraft cook. The lignin carbohydrate bonds that were responsible for residual lignin retention in unbleached pulp were compared and analyzed with the original lignin-carbohydrate complex (LCC) bonds in native birch wood. It was shown that lignin remaining after pulping and oxygen delignification was mainly bound to xylan, whereas the lignin bound to glucomannan was for the most part degraded.
Journal articles
Magazine articles
TAPPI Journal Summaries, Paper360º September/October 2020
TAPPI Journal Summaries, Paper360º September/October 2020
Journal articles
Magazine articles
Co-pulping of Trewia nudiflora and Trema orientalis, TAPPI Journal June 2023
ABSTRACT: Trewia nudiflora, a fast-growing species, was evaluated as a pulpwood. The a-cellulose content of this species was 40.4% with a Klason lignin of 21.5%. It was characterized by shorter fibers with a thin cell wall. The pulp yield was 40% with a kappa number of 16 at the conditions of 18% active alkali charge and 30% sulfidity for 2 h cooking at 170°C. T. nudiflora was similar to Trema orientalis in anatomical, morphological, and chemical composition; therefore, mixed chips at a 50:50 mixture ratio were cooked under optimum conditions. The pulp yield of mixed chip cooking was 45.4% with a kappa number of 19.4. The tensile and tear index of T. nudiflora pulps were 64.8 Nœm/g and 11.5 kPaœm2/g at 35 °SR, respectively. The mixed chips, T. nudiflora, and T. orientalis pulps showed above 81% brightness when bleached by D0(EP)D1 sequence using 20 kg chlorine dioxide (ClO2)/ton of pulp.
Journal articles
Improve Your Energy Efficiency, Paper360° January/February 2010
Improve Your Energy Efficiency, Paper360º January/February 2010
Journal articles
Evaluation of a molybdenum sulfide reference electrode in hot alkaline solutions, TAPPI JOURNAL July 2010
Evaluation of a molybdenum sulfide reference electrode in hot alkaline solutions, TAPPI JOURNAL July 2010
Journal articles
Improving anaerobic conversion of pulp mill secondary sludge to biogas by pretreatment, TAPPI JOURNAL June 2010
Improving anaerobic conversion of pulp mill secondary sludge to biogas by pretreatment, TAPPI JOURNAL June 2010
Journal articles
The effect of flocculants on the filtration of bagasse pulp pads, TAPPI JOURNAL May 2010
The effect of flocculants on the filtration of bagasse pulp pads, TAPPI JOURNAL May 2010
Journal articles
Setpoint: The Rush Is On, Paper360° September/October 2011
SetPoint: The Rush Is On, Paper360º September/October 2011
Journal articles
Increasing lime production while decreasing kiln pluggage through installation of the first LimeFlash lime kiln feed system in North America, TAPPI JOURNAL August 2012
Increasing lime production while decreasing kiln pluggage through installation of the first LimeFlash lime kiln feed system in North America, TAPPI JOURNAL August 2012
Journal articles
Optical analysis of ink and other contaminants in process waters, TAPPI JOURNAL August 2012
Optical analysis of ink and other contaminants in process waters, TAPPI JOURNAL August 2012