Search

Kraft Lignin Production at West Fraser’s Hinton Mill, 2022PEERS/IBBC Conference (22PEE/22IBB)

Reinforcement Learning Techniques To Support Industrial Process Control, TAPPICon25

Conical vs Double Disk Refining Technology Evaluations and the Effects on Energy Consumption and Physical Paper Properties of High Yield Southern Softwood, TAPPICon25

ENHANCING TISSUE WET PRESSING PERFORMANCE AND DRY END MATERIAL EFFICIENCY FOR COST SAVINGS, TAPPICon25

Digester Scale Control: Fundamentals and Best Practices for Responding to Process Variations, 2018 PEERS

Digester Scale Control: Fundamentals and Best Practices for Responding to Process Variations, 2018 PEERS

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.

PRE-EVAPORATION CHOICES For INCREMENTAL EVAPORATIVE CAPACITY

PRE-EVAPORATION CHOICES For INCREMENTAL EVAPORATIVE CAPACITY In EXISTING MILLS, 2017PEERS

Update on Optimizing Black Liquor Recovery Throughput and In

Update on Optimizing Black Liquor Recovery Throughput and Increase Campaign Life with Chemical Additives, 2017PEERS

RECOVERY BOILER SCR • A CHALLENGE AND ANOPPORTUNITY IN RETRO

RECOVERY BOILER SCR • A CHALLENGE AND ANOPPORTUNITY IN RETROFIT CASES, 2017PEERS

Use of fines-enriched chemical pulp to increase CTMP strength, TAPPI Journal April 2021

ABSTRACT: In this study, fines-enriched pulp (FE-pulp)—the fine fraction of highly-refined kraft pulp—was benchmarked against highly-refined kraft pulp (HRK-pulp) as a strength agent in eucalyptus chemithermomechanical pulp (CTMP). Both the FE-pulp and the HRK-pulp were produced from unbleached softwood kraft pulp, and equal amounts of those strength agents were added to the original CTMP, as well as to washed CTMP, where most of the fines had been removed. The effects of the added strength agents were evaluated with laboratory handsheets.The FE-pulp proved to be twice as effective as HRK-pulp. Both HRK-pulp and FE-pulp increased the strength of the CTMP handsheets. The bulk of the handsheets decreased, however, as well as the drainability. The addition of 5% FE-pulp resulted in the same strength increase as an addition of 10% HRK-pulp, as well as the same decrease in bulk and CSF. For the handsheets of washed CTMP, the strengths were not measurable; the CTMP lost the sheet strength when the CTMP-fines content was reduced through washing. The reduced strength properties were compensated for by the addition of chemical pulp fines that proved to be an efficient strength agent. The addition of 5% FE-pulp restored the strength values, and at a higher bulk and higher drainability.