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INTENSIFIED CONTINUOUS BIOMASS TREATMENT BY TWIN SCREW EXTRUSION, 2022PEERS/IBBC Conference (22PEE/22IBB)

Swift Kraft lignin depolymerisation under hydrothermal conditions, 2022PEERS/IBBC Conference (22PEE/22IBB)

Investigation on the Effects of Particle Size and Pyrolysis Temperature on Fast Pyrolysis of Southern Pine Forest Residue TissueFractions Using Pyro-GC/MS, 2022PEERS/IBBC Conference (22PEE/22IBB)

The current state of predicting the performance of biomass pyrolysis process using machine learning tools, 2022PEERS/IBBC Conference (22PEE/22IBB)

The Effects of Hot Water Extraction of Lignocellulosic Biomass on Fuel Pellet Properties, 2022PEERS/IBBC Conference (22PEE/22IBB)

Sandwich Belt High Conveyors Elevate Biomass, 2022PEERS/IBBC Conference (22PEE/22IBB)

Syngas Upgrading Flexibility Using Hot Oxygen Technology, 2022PEERS/IBBC Conference (22PEE/22IBB)

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.

World’s Largest MVR Evaporation Plant for Sulphite Spent Liquor at Sappi Saiccor Pulp Mill, Paper360º July/August 2022

TAPPI Journal Summaries, Paper360º July/August 2022

TAPPI Journal Summaries, Paper360º July/August 2022