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Journal articles
Magazine articles
Open Access
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.

Journal articles
Open Access
Full Characterization of Stickies in a Newsprint Mill: The Need for a Complementary Approach TAPPI JOURNAL, January 2007

Full Characterization of Stickies in a Newsprint Mill: The Need for a Complementary Approach TAPPI JOURNAL, January 2007

Journal articles
Open Access
Hard-to-remove water in cellulose fibers characterized by thermal analysis: A model for the drying of wood-based fibers, TAPPI JOURNAL, July 2007

Hard-to-remove water in cellulose fibers characterized by thermal analysis: A model for the drying of wood-based fibers, TAPPI JOURNAL, July 2007

Journal articles
Open Access
Life-cycle thinking in the pulp and paper industry, Part I: Current practices and most promising avenues, TAPPI JOURNAL, July 2007

Life-cycle thinking in the pulp and paper industry, Part I: Current practices and most promising avenues, TAPPI JOURNAL, July 2007

Journal articles
Open Access
Treatment of Bleaching Effluent From the Pulp and Paper Industry by Photcatalytic Oxidation, TAPPI JOURNAL, June 2007

Treatment of Bleaching Effluent From the Pulp and Paper Industry by Photcatalytic Oxidation, TAPPI JOURNAL, June 2007

Journal articles
Open Access
Gasification of Mixtures of Black Liquor and Secondary Sludge, TAPPI JOURNAL, March 2007

Gasification of Mixtures of Black Liquor and Secondary Sludge, TAPPI JOURNAL, March 2007

Journal articles
Open Access
Experimental Investigation of Black Liquor Pyrolysis Using Single Droplet TGA, TAPPI JOURNAL, May 2007

Experimental Investigation of Black Liquor Pyrolysis Using Single Droplet TGA, TAPPI JOURNAL, May 2007

Journal articles
Open Access
A New Model for Maximizing the Bending Stiffness of a Symmetric Three-Ply Paper or Board, TAPPI JOURNAL October 2008

A New Model for Maximizing the Bending Stiffness of a Symmetric Three-Ply Paper or Board, TAPPI JOURNAL October 2008

Journal articles
Open Access
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
Open Access
Optimization of ECF Bleaching of Kraft Pulp: II. Effects of Acid Prehydrolysis on Hardwood Pulp Bleachability, TAPPI JOURNAL August 2009

Optimization of ECF Bleaching of Kraft Pulp: II. Effects of Acid Prehydrolysis on Hardwood Pulp Bleachability, TAPPI JOURNAL August 2009

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