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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
Magazine articles
Open Access
Online measurement of bulk, tensile, brightness, and ovendry content of bleached chemithermomechanical pulp using visible and near infrared spectroscopy, TAPPI JOURNAL April 2018

Online measurement of bulk, tensile, brightness, and ovendry content of bleached chemithermomechanical pulp using visible and near infrared spectroscopy, TAPPI JOURNAL April 2018

Journal articles
Magazine articles
Open Access
Enzymatic treated viscose fibers functionalized by chitosan, TAPPI JOURNAL August 2018

Enzymatic treated viscose fibers functionalized by chitosan, TAPPI JOURNAL August 2018

Journal articles
Open Access
Improvement in the Fock test for determining the reactivity of dissolving pulp, TAPPI JOURNAL November 2013

Improvement in the Fock test for determining the reactivity of dissolving pulp, TAPPI JOURNAL November 2013

Journal articles
Open Access
The effect of introducing ozone in elemental chlorine free bleaching of eucalyptus kraft pulp, TAPPI JOURNAL November 2013

The effect of introducing ozone in elemental chlorine free bleaching of eucalyptus kraft pulp, TAPPI JOURNAL November 2013

Journal articles
Open Access
Elemental chlorine-free bleaching of North American hardwood kraft pulps: Evaluation of oxidant-reinforced extraction variables on overall bleaching optimization, TAPPI JOURNAL October 2013

Elemental chlorine-free bleaching of North American hardwood kraft pulps: Evaluation of oxidant-reinforced extraction variables on overall bleaching optimization, TAPPI JOURNAL October 2013

Journal articles
Open Access
Detailed characterization of poor settling green liquor dregs, TAPPI JOURNAL September 2013

Detailed characterization of poor settling green liquor dregs, TAPPI JOURNAL September 2013

Journal articles
Open Access
A theoretical analysis of recirculation in pulp refiners, TAPPI JOURNAL April 2014

A theoretical analysis of recirculation in pulp refiners, TAPPI JOURNAL April 2014

Journal articles
Open Access
Editorial: Peer-Reviewed Engineering highlights from PEERS 2013, TAPPI JOURNAL August 2014

Editorial: Peer-Reviewed Engineering highlights from PEERS 2013, TAPPI JOURNAL August 2014

Journal articles
Open Access
Brownstock washing A review of the literature, TAPPI JOURNAL January 2014

Brownstock washing A review of the literature, TAPPI JOURNAL January 2014

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