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Journal articles
Magazine articles
Open Access
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
Open Access
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
Open Access
Evaluation of the us epa recommended approach to predicting air emissions from pulp and paper industry landfills, TAPPI JOURNAL, December 1999, Vol. 82(12)

Evaluation of the us epa recommended approach to predicting air emissions from pulp and paper industry landfills, TAPPI JOURNAL, December 1999, Vol. 82(12)

Journal articles
Open Access
Recovery modernization at stora enso's skutskar kraft mill, TAPPI JOURNAL, December 1999, Vol. 82(12)

Recovery modernization at stora enso's skutskar kraft mill, TAPPI JOURNAL, December 1999, Vol. 82(12)

Journal articles
Open Access
Modeling studies of a composite tube floor in black liquor recovery boilers, TAPPI JOURNAL, December 1999, Vol. 82(12)

Modeling studies of a composite tube floor in black liquor recovery boilers, TAPPI JOURNAL, December 1999, Vol. 82(12)

Journal articles
Open Access
Amine boranes as new reductive bleaching chemicals on softwood pulp single stage and multistage processes, TAPPI JOURNAL, February 1999, Vol. 82(2)

Amine boranes as new reductive bleaching chemicals on softwood pulp single stage and multistage processes, TAPPI JOURNAL, February 1999, Vol. 82(2)

Journal articles
Open Access
A cradle-to-gate life cycle assessment of straw pulp incorporation into telephone directory-grade paper, TAPPI JOURNAL, February 1999, Vol. 82(2)

A cradle-to-gate life cycle assessment of straw pulp incorporation into telephone directory-grade paper, TAPPI JOURNAL, February 1999, Vol. 82(2)

Journal articles
Open Access
Factors affecting the partitioning of methanol vapor-liquid phases in black liquors, TAPPI JOURNAL, February 1999, Vol. 82(2)

Factors affecting the partitioning of methanol vapor-liquid phases in black liquors, TAPPI JOURNAL, February 1999, Vol. 82(2)

Journal articles
Open Access
Investigation of chemical recovery unit floor tube overheat failures, TAPPI JOURNAL, February 1999, Vol. 82(2)

Investigation of chemical recovery unit floor tube overheat failures, TAPPI JOURNAL, February 1999, Vol. 82(2)

Journal articles
Open Access
Closure of a nine-acre industrial landfill using pulp and paper mill residuals, TAPPI JOURNAL, February 1999, Vol. 82(2)

Closure of a nine-acre industrial landfill using pulp and paper mill residuals, TAPPI JOURNAL, February 1999, Vol. 82(2)

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