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Fundamental molecular characterization and comparison of the O, D0, and E stage effluents from hardwood pulp bleaching, TAPPI Journal 2019

ABSTRACT: The present study characterized effluents from the O, D0, and E stages using nuclear magnetic reso-nance (NMR) and gel permeation chromatography (GPC) techniques to better understand the chemical nature of the dissolved organics formed from the bleaching of a high-yield hardwood kraft pulp. Understanding the structures and molecular weight distribution of these organics is the first step in developing methods to mitigate these contam-inates in the discharged effluents. The results indicated that the molecular weight distribution (MWD) of the dis-solved organics from oxygen delignification effluent is broader than those from D0 and E stage effluents. In addition, the O stage filtrate contained considerable amounts of lignin and xylan fragments, which showed its efficiency in removing such materials. The effluent from the D0 stage contained a lower amount of high molecular weight frag-ments and a higher amount of low molecular weight fragments versus the O-stage filtrate. Aromatic structures were nearly absent in the D0 stage filtrate, but the degraded organic material, presumably from oxidized lignin, contained olefinic (C=C) and carbonyl (C=O) functional groups. Furthermore, higher molecular weight fragments were detected in the E-stage effluent, presumably due to the extensive solubilization and removal of the oxidized lignin generated from the D0 pulp.

Editorial: Professional Networking in the Nonwovens and Technical Textiles Sector

Editorial: Professional Networking in the Nonwovens and Technical Textiles Sector, TAPPI Journal, May 2017

Functional surfaces produced by foam coating, TAPPI JOURNAL

Functional surfaces produced by foam coating, TAPPI JOURNAL August 2016

Acoustic analysis of recovery boiler dissolving tank operati

Acoustic analysis of recovery boiler dissolving tank operation and smelt shattering efficiency, TAPPI JOURNAL September 2016

Editorial: PEERS 2016 honors technical achievements, TAPPI J

Editorial: PEERS 2016 honors technical achievements, TAPPI JOURNAL September 2016

Effects of localized environment on eucalyptus clone chemica

Effects of localized environment on eucalyptus clone chemical composition, TAPPI JOURNAL September 2016

Fast evaluation of spatial coating layer formation using ultraviolet scanner imaging

Fast evaluation of spatial coating layer formation using ultraviolet scanner imaging, TAPPI JOURNAL August 2015

Editorial: Carl Houtman: A government research perspective

Polarized Light Reflectometry for Studies of Paper Coating

Polarized Light Reflectometry for Studies of Paper Coating

Image analytical monitoring of paper quality - a feasibility

ABSTRACT: We evaluated 14 selected paper quality parameters using new image analytical techniques for characterization and monitoring of paper quality (multivariate AMT regression). We tested the technique on six major paper types. Of the parameters tested, 13 could be modeled with only minor optimization of the initial experimental image recording parameters. Although this analysis was performed in the laboratory with static sheets of paper, this new “remote sensing” image technique shows promising application potential for online product monitoring of the specified physical qualities.