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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
PSA properties and screenability in paper recycling, TAPPI JOURNAL, August 2005, Vol. 4(8) (264 KB)
PSA properties and screenability in paper recycling, TAPPI JOURNAL, August 2005, Vol. 4(8) (264 KB)
Journal articles
Reducing shives level in nonwood chemithermomechanical pulp, TAPPI JOURNAL, August 2005, Vol. 4(8) (200 KB)
Reducing shives level in nonwood chemithermomechanical pulp, TAPPI JOURNAL, August 2005, Vol. 4(8) (200 KB)
Journal articles
Recent Advances in the Application of Acoustic Leak Detectio
Recent Advances in the Application of Acoustic Leak Detection to Process Recovery Boilers, 1995 Engineering Conference Proceedings
Journal articles
Effects of pulverized coal fly-ash addition as a wet-end filler in papermaking, TAPPI JOURNAL September 2008
Effects of pulverized coal fly-ash addition as a wet-end filler in papermaking, TAPPI JOURNAL September 2008
Journal articles
The effects of dissolved solids on the vapor-liquid equilibrium of DMS in black liquor, TAPPI JOURNAL September 2008
The effects of dissolved solids on the vapor-liquid equilibrium of DMS in black liquor, TAPPI JOURNAL September 2008
Journal articles
A gravity model analysis of China's pulp and paper products trade, TAPPI JOURNAL September 2008
A gravity model analysis of China's pulp and paper products trade, TAPPI JOURNAL September 2008
Journal articles
Economic potential of black liquor electrolysis as a treatment option for small agro-based mills, TAPPI JOURNAL November 2009
Economic potential of black liquor electrolysis as a treatment option for small agro-based mills, TAPPI JOURNAL November 2009
Journal articles
Monitoring kraft recovery boiler fouling using principal component analysis, TAPPI JOURNAL November 2009
Monitoring kraft recovery boiler fouling using principal component analysis, TAPPI JOURNAL November 2009
Journal articles
Co-refining interactions among white birch, hybrid larch and black spruce species, TAPPI JOURNAL November 2009
Co-refining interactions among white birch, hybrid larch and black spruce species, TAPPI JOURNAL November 2009