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Toward Deinking of LEP Inks Printed on Different Substrates, PaperCon 2013

Toward Deinking of LEP Inks Printed on Different Substrates, PaperCon 2013

A New Sensor Based Approach to Brown Stock Washer Optimizati

A New Sensor Based Approach to Brown Stock Washer Optimization, 2015 PEERS Conference

Södra Cell Värö Mill Expansion, Making Of A State-Of-The-Art

Södra Cell Värö Mill Expansion, Making Of A State-Of-The-Art Pulp Mill, 2015 PEERS Conference

Is there Sulfuric Acid in Flue Gases in Biomass Combustion?

Is there Sulfuric Acid in Flue Gases in Biomass Combustion? Measurement Techniques and Results, 2016 PEERS

Generalized Steady-State Model for Chlorine Dioxide Brighten

Generalized Steady-State Model for Chlorine Dioxide Brightening of Hardwood Kraft Pulps, 2016 PEERS

Control System Improves Reliability and Safety of Recovery Boilers, 19PEERS

Control System Improves Reliability and Safety of Recovery Boilers, 19PEERS

Combustion System Upgrade on CKPI’s Biomass-Fired Boiler, 19PEERS

Combustion System Upgrade on CKPI’s Biomass-Fired Boiler, 19PEERS

TURBOSCRUBBER® - BLEACH PLANT SCRUBBER APPLICATION, 19PEERS

TURBOSCRUBBER® - BLEACH PLANT SCRUBBER APPLICATION, 19PEERS

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.

Some Preliminary Results on Oxygen Addition to D-Stage Bleaching (D/O), 2022PEERS/IBBC Conference (22PEE/22IBB)