Search
Use the search bar or filters below to find any TAPPI product or publication.
Filters
Content Type
Publications
Level of Knowledge
Committees
Collections
Journal articles
Magazine articles
Preparing prehydrolyzed kraft dissolving pulp via phosphotungstic acid prehydrolysis from grape branches, TAPPI Journal January 2022
ABSTRACT: Dissolving pulp was successful prepared via phosphotungstic acid (PTA) prehydrolysis kraft (PHK) cooking followed by an elementary chlorine-free (ECF) bleaching process from grape branches. The effects of prehydrolysis temperature, reaction time, and PTA concentration that potentially affect the quality of dissolving pulp product on chemical components of pulp were studied via an orthogonal experiment. The structure of lignin was activated during the PTA prehydrolysis phase, and lignin was easily removed during the following cooking process. Thus, relatively mild conditions (140°C, 100 min) can be used in the cooking process. During the prehydrolysis phase, temperature exhibited the most significant influence on the cellulose purity of the obtained pulp fiber, followed by reaction time and PTA concentration. The optimized prehydrolysis conditions were as follows: prehydrolysis temperature, 145°C; reaction time, 75 min; and PTA concentration, 1 wt%. Whether the excessively high prehydrolysis temperature or prolonging the reaction time did not favor the retention of long chain cellulose, the delignification selectivity for the cooking process could not be further improved by excessive PTA loading. Under these prehydrolysis conditions, 94.1% and 29.0% for a-cellulose content and total yield could be achieved after the given cooking and bleaching conditions, respectively. Moreover, the chemical structure and crystal form of cellulose were scarcely changed after PTA prehydrolysis, which could be confirmed by results from Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD). PTA prehydrolysis could be considered as an alternative method for preparing PHK dissolving pulp under relatively mild cooking conditions.
Journal articles
Magazine articles
Considerations in managing wastewater odor at pulp and paper operations, TAPPI Journal March 2022
ABSTRACT: Many pulp and paper mills are, at least periodically, faced with the release of odors that can migrate offsite and be considered a nuisance by nearby residents. At chemical pulp mills, perceptible odors associated with reduced sulfur compounds (RSCs) are common, many of which are highly perceptible owing to their low odor thresholds. As releases of RSCs and other odorous substances from production processes are progressively controlled, the proportional contribution from wastewater treatment systems to areal odors can increase. This review paper summarizes important fundamentals of odor generation, source identification, and control. Common odorous substances are identified, and mechanisms for their generation are summarized. Approaches for measuring odorous substances are detailed to enable more effective management, and various odor control strategies are discussed.
Journal articles
Alkaline peroxide mechanical pulping of wheat straw part 1: factors influencing the brightness response in impregnation, TAPPI JOURNAL, July 2000, Vol. 83(7)
Alkaline peroxide mechanical pulping of wheat straw part 1: factors influencing the brightness response in impregnation, TAPPI JOURNAL, July 2000, Vol. 83(7)
Journal articles
A new method for calculating equilibrium solubility of burkeite and sodium carbonate in black liquor, TAPPI JOURNAL, July 2000, Vol. 83(7)
A new method for calculating equilibrium solubility of burkeite and sodium carbonate in black liquor, TAPPI JOURNAL, July 2000, Vol. 83(7)
Journal articles
Analysis and characterization of contaminants in occ recycle furnishes, TAPPI JOURNAL, July 2000, Vol. 83(7)
Analysis and characterization of contaminants in occ recycle furnishes, TAPPI JOURNAL, July 2000, Vol. 83(7)
Journal articles
Analysis of pulping data using the self-organizing map, TAPPI JOURNAL, July 2000, Vol. 83(7)
Analysis of pulping data using the self-organizing map, TAPPI JOURNAL, July 2000, Vol. 83(7)
Journal articles
Investing in the future of your mill, TAPPI JOURNAL, July 2000, Vol. 83(7)
Investing in the future of your mill, TAPPI JOURNAL, July 2000, Vol. 83(7)
Journal articles
Preparation and characterization of cellulose nanofibers from bleached pulp using a mechanical treatment method, TAPPI JOURNAL May 2014
Preparation and characterization of cellulose nanofibers from bleached pulp using a mechanical treatment method, TAPPI JOURNAL May 2014
Journal articles
Biomechanical pulping with phlebiopsis gigantea reduced energy, TAPPI JOURNAL, September 2000, Vol. 83(9)
Biomechanical pulping with phlebiopsis gigantea reduced energy, TAPPI JOURNAL, September 2000, Vol. 83(9)
Journal articles
Design and operation of a woodwaste cogeneration plant, TAPPI JOURNAL, September 2000, Vol. 83(9)
Design and operation of a woodwaste cogeneration plant, TAPPI JOURNAL, September 2000, Vol. 83(9)