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Displacement washing of softwood pulp cooked to various levels of residual lignin content, TAPPI Journal September 2021

ABSTRACT: This study investigates the influence of the degree of delignification of kraft spruce pulp cooked at seven different kappa numbers, ranging from 18.1 to 50.1, on the efficiency of displacement washing under laboratory conditions. Although the pulp bed is a polydispersive and heterogeneous system, the correlation dependence of the wash yield and bed efficiency on the Péclet number and the kappa number of the pulp showed that washing efficiency increased not only with an increasing Péclet number, but also with an increasing kappa number. The linear dependence between the mean residence time of the solute lignin in the bed and the space time, which reflects the residence time of the wash liquid in the pulp bed, was found for all levels of the kappa number. Washing also reduced the kappa number and the residual lignin content in the pulp fibers.

TAPPI Journal Summaries, Paper360º September/October 2019

TAPPI Journal Summaries, Paper360º September/October 2019

TAPPI Journal Summaries, November/December 2023 Paper360º

Editorial: 2018 TAPPI Journal features diverse content, TAPPI Journal November 2018

Editorial: 2018 TAPPI Journal features diverse content, TAPPI Journal November 2018

Facing the Market, Paper360 May/June 2019

Facing the Market, Paper360 May/June 2019

Wheat straw as an alternative pulp fiber, TAPPI Journal January 2020

ABSTRACT: The desire to market sustainable packaging materials has led to an interest in the use of various fiber types as a raw material. It has been suggested that the use of annual crops for partial replacement of wood fiber would result in more sustainable products. Several life cycle analyses (LCA) have been performed to evaluate these claims. These LCAs provided conflicting and contradictory results because of the local conditions and the specific pulping processes investigated. Selected LCAs are reviewed and the underlying reasons for these conflicting results are analyzed.

Wood Pulp: The New Cotton for the Garment Industry?, Paper360 May/June 2019

Wood Pulp: The New Cotton for the Garment Industry?, Paper360 May/June 2019

He’s Got the Pulp: Schalka Sets Record as LA CEO of the Year, Paper360º September/October 2019

He’s Got the Pulp: Schalka Sets Record as LA CEO of the Year, Paper360º September/October 2019

Air and Water Management: Meeting the Ongoing Challenges, Paper360º September/October

Air and Water Management: Meeting the Ongoing Challenges, Paper360º September/October

Alternative “green” lime kiln fuels: Part II—Woody biomass, bio-oils, gasification, and hydrogen, TAPPI Journal May 2020

ABSTRACT: This paper is the second of a two-part series on “green” lime kiln fuels. The first part of this work reviews the use of pulp mill and recovery byproducts as either full or partial replacement of oil or natural gas in the kiln. The second part reviews the use of various forms of woody biomass, bio-oils, gasification and hydrogen as potential carbon neutral or carbon-free lime kiln fuels. Several of these options require specialized burners to supply the fuel to the kiln and high-quality metallurgy to withstand the acidic conditions of the fuel.