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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.

Magazine articles
Open Access
Continuous dust measurement as an indication of sootblowing performance in a recovery boiler, TAPPI JOURNAL, May 2001, Vol. 84(5)

Continuous dust measurement as an indication of sootblowing performance in a recovery boiler, TAPPI JOURNAL, May 2001, Vol. 84(5)

Magazine articles
Open Access
Evaluating treatment processes to reduce metals concentrations in pulp and paper mill wastewaters to extremely low values, TAPPI JOURNAL, April 2001, Vol. 84(4)

Evaluating treatment processes to reduce metals concentrations in pulp and paper mill wastewaters to extremely low values, TAPPI JOURNAL, April 2001, Vol. 84(4)

Magazine articles
Open Access
Calcium based sulfur recovery process for kraft black liquor gasification - proof of concept', TAPPI JOURNAL, July 2000, Vol. 83(7)

Calcium based sulfur recovery process for kraft black liquor gasification - proof of concept', TAPPI JOURNAL, July 2000, Vol. 83(7)

Magazine articles
Open Access
The use of oxidized white liquor as a caustic replacement in o, eo, eop, and e2 bleaching stages of kraft hardwood and softwood pulp, TAPPI JOURNAL, June 2000, Vol. 83(6)

The use of oxidized white liquor as a caustic replacement in o, eo, eop, and e2 bleaching stages of kraft hardwood and softwood pulp, TAPPI JOURNAL, June 2000, Vol. 83(6)

Magazine articles
Open Access
Deinking difficulties related to ink formulation, printing process, and type of paper, TAPPI JOURNAL, June 2000, Vol. 83(6)

Deinking difficulties related to ink formulation, printing process, and type of paper, TAPPI JOURNAL, June 2000, Vol. 83(6)

Magazine articles
Open Access
Industry leaders: jukka harmala leads stora enso into new global age, TAPPI JOURNAL, May 2000, Vol. 83(5)

Industry leaders: jukka harmala leads stora enso into new global age, TAPPI JOURNAL, May 2000, Vol. 83(5)

Magazine articles
Open Access
A personal mount st. helens experience, TAPPI JOURNAL, May 2000, Vol. 83(5)

A personal mount st. helens experience, TAPPI JOURNAL, May 2000, Vol. 83(5)

Magazine articles
Open Access
Energy: recovering capital and cutting costs, TAPPI JOURNAL, November 2000, Vol. 83(11)

Energy: recovering capital and cutting costs, TAPPI JOURNAL, November 2000, Vol. 83(11)

Magazine articles
Open Access
Reliability of stainless alloy equipment in chlorine dioxide bleaching, TAPPI JOURNAL, November 2000, Vol. 83(11)

Reliability of stainless alloy equipment in chlorine dioxide bleaching, TAPPI JOURNAL, November 2000, Vol. 83(11)

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