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Journal articles
Kinetic models for all chlorine dioxide and extraction stages in full ECF bleaching sequences of softwoods and hardwoods, TAPPI JOURNAL November 2009
Kinetic models for all chlorine dioxide and extraction stages in full ECF bleaching sequences of softwoods and hardwoods, TAPPI JOURNAL November 2009
Journal articles
Fiber Trapping in Low-Consistency Refining: New Parameters to Describe the Refining Process, TAPPI JOURNAL October 2009
Fiber Trapping in Low-Consistency Refining: New Parameters to Describe the Refining Process, TAPPI JOURNAL October 2009
Journal articles
Operating Costs Related to Instability in a Pulp and Paper Activated Sludge Treatment System, TAPPI JOURNAL October 2009
Operating Costs Related to Instability in a Pulp and Paper Activated Sludge Treatment System, TAPPI JOURNAL October 2009
Journal articles
Editor's Note: A Meeting of Minds, TAPPI JOURNAL April 2009
Editor's Note: A Meeting of Minds, TAPPI JOURNAL April 2009
Journal articles
Effects of Specific Gravity and Wood Chemical Content on the Pulp Yield of Loblolly Pine, TAPPI JOURNAL April 2009
Effects of Specific Gravity and Wood Chemical Content on the Pulp Yield of Loblolly Pine, TAPPI JOURNAL April 2009
Journal articles
Eucalyptus Wood Quality and Its Impact on Kraft Pulp Production and Use, TAPPI JOURNAL August 2009
Eucalyptus Wood Quality and Its Impact on Kraft Pulp Production and Use, TAPPI JOURNAL August 2009
Journal articles
Experimental pulping kinetics of Pinus radiata cultivated in Chile, TAPPI JOURNAL, October 2007
Experimental pulping kinetics of Pinus radiata cultivated in Chile, TAPPI JOURNAL, October 2007
Journal articles
Abaca as a reinforcement fiber for softwood pulp, TAPPI JOURNAL, October 2007
Abaca as a reinforcement fiber for softwood pulp, TAPPI JOURNAL, October 2007
Journal articles
Power consumption distribution in a TMP refiner: Comparison of the first and second stages, TAPPI JOURNAL, September 2007
Power consumption distribution in a TMP refiner: Comparison of the first and second stages, TAPPI JOURNAL, September 2007
Journal articles
Conversion of paper-grade pulp from rice straw into dissolving pulp, TAPPI Journal June 2025
ABSTRACT: About 1,165 million metric tons of rice straw is generated every year worldwide, which can be a good source for the circular bioeconomy. In this research paper, the paper-grade pulp from rice straw was converted to dissolving-grade pulp by fractionation in a biorefinery initiative. Rice straw was cooked at an optimum condition of 8% potassium hydroxide (KOH) charge for 120 min at 150°C and produced a pulp yield of 47.2% with a kappa number of 18.5. Subsequently, D0(EP)D1 bleaching was carried out for the produced pulp, and the brightness of the pulp reached to 82.4%. From the black liquor, 16.5% of the lignin and 11.9% of the hemicellulose were isolated for producing biobased products and chemicals, and then the spent liquor was used for soil amendment. The bleached pulp was fractionated in a Bauer McNett fiber classifier. The pulp fibers retained on 16-, 30-, and 50-mesh screens were used as a longer fiber fraction pulp, and pulp fibers retained on 100- and 200-mesh screens were used as a shorter fiber pulp. The longer and shorter fiber fraction pulps were analyzed for cellulose, R10, pentosan, and viscosity. The long fiber fraction pulps were characterized by higher cellulose (88.2% vs. 83.1%) and lower pentosan (11.3% vs. 13.0%) content than the shorter fiber fraction pulps. The longer fiber fraction was further treated with cold KOH to remove residual hemicellulose. The KOH extraction reduced pentosan content in pulp to 6.3% and increased á-cellulose content to 91.3%. The short fiber fraction was converted to monomeric sugars using cellulase enzymes with varying reaction time, temperature, and consistency. The efficiency of cellulase activity was assessed through glucose yield and residual dry weight. A temperature of 45°C, 5.0 pH, 5% consistency, and 6 filter paper units/gram (FPU/g) o.d. pulp resulted in maximum sugar conversion of 85.7%.