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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.
Highly Absorbent Fluff Pulp from Refiner Mechanical Pulping of Banana Fiber, 2014 PEERS Conference
Highly Absorbent Fluff Pulp from Refiner Mechanical Pulping of Banana Fiber, 2014 PEERS Conference
Precision steam path dimensional measurement, the key to developing competitive steam path rerates, and advanced technology component upgrades, 2012 TAPPI PEERS Conference
Precision steam path dimensional measurement, the key to developing competitive steam path rerates, and advanced technology component upgrades, 2012 TAPPI PEERS Conference
Liquid plasma polymerization process for improved deinkability of pigmented inkjet digital printed paper, 2012 TAPPI PEERS Conference
Liquid plasma polymerization process for improved deinkability of pigmented inkjet digital printed paper, 2012 TAPPI PEERS Conference
Colloidal Fuel Dispersions using Coal, Petroleum Coke and Asphaltite, 2012 TAPPI PEERS Conference
Colloidal Fuel Dispersions using Coal, Petroleum Coke and Asphaltite, 2012 TAPPI PEERS Conference
Conference papers
Expansion Of Chemical Recovery Capacity At Södra Cell Värö M
Expansion Of Chemical Recovery Capacity At Södra Cell Värö Mill, Sweden, 2017PEERS
Conference papers
Current Steam Turbine Technology and its Applicability in th
Current Steam Turbine Technology and its Applicability in the Pulp and Paper Market, 2017PEERS
Conference papers
PRE-EVAPORATION CHOICES For INCREMENTAL EVAPORATIVE CAPACITY
PRE-EVAPORATION CHOICES For INCREMENTAL EVAPORATIVE CAPACITY In EXISTING MILLS, 2017PEERS
Conference papers
The Use of Parametric Analysis to Identify Opportunities for
The Use of Parametric Analysis to Identify Opportunities for Improved Operations of Lime Kilns, 2017PEERS
Conference papers
Update on Optimizing Black Liquor Recovery Throughput and In
Update on Optimizing Black Liquor Recovery Throughput and Increase Campaign Life with Chemical Additives, 2017PEERS