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Refining: Recycled Fiber for Tissue Production, 19PEERS

Refining: Recycled Fiber for Tissue Production, 19PEERS

Critical parameters for tall oil separation I: The importance of ration of fatty acids to rosin acids, TAPPI Journal September 2019

ABSTRACT: Tall oil is a valuable byproduct in chemical pulping of wood, and its fractions have a large spectrum of applications as chemical precursors, detergents, and fuel. High recovery of tall oil is important for the economic and environmental profile of chemical pulp mills. The purpose of this study was to investigate critical parameters of tall oil separation from black liquor. To investigate this in a controlled way, we developed a model test system using a “synthetic” black liquor (active cooking chemicals OH- and HS- ions), a complete process for soap skimming, and determination of recovered tall oil based on solvent extraction and colorimetric analysis, with good reproducibility. We used the developed system to study the effect of the ratio of fatty acids to rosin acids on tall oil separation. When high amounts of rosin acids were present, tall oil recovery was low, while high content of fatty acids above 60% significantly promoted tall oil separation. Therefore, manipulating the content of fatty acids in black liquor before the soap skimming step can significantly affect the tall oil solubility, and hence its separation. The findings open up chemical ways to improve the tall oil yield.

Chemical Process Safety: Fundamentals with Applications (3rd Edition)

Chemical Process Safety: Fundamentals with Applications (3rd Edition)

´We Must Grow—In All Areas’, Paper360º May/June 2020

´We Must Grow—In All Areas’, Paper360º May/June 2020

Process Simulation: Bridging the Knowledge Gap, 20PEERS Conference

Process Simulation: Bridging the Knowledge Gap, 20PEERS Conference

EXTENSION OF A STEADY-STATE CHLORINE DIOXIDE BRIGHTENING MODEL FOR Z-ECF BLEACHING OF SOFTWOOD KRAFT PULPS, 20PEERS Conference

EXTENSION OF A STEADY-STATE CHLORINE DIOXIDE BRIGHTENING MODEL FOR Z-ECF BLEACHING OF SOFTWOOD KRAFT PULPS, 20PEERS Conference

ADVANTAGES OF LEAN DUPLEX STAINLESS STEELS IN THE PULP AND PAPER INDUSTRY, 2022PEERS/IBBC Conference (22PEE/22IBB)

Green Liquor Clarification Improvements by Utilizing Existing Tanks and Vessels in Mills, 2022PEERS/IBBC Conference (22PEE/22IBB)

Dissolution of wood components during hot water extraction of spruce, TAPPI Journal May 2023

ABSTRACT: The purpose of this study was to investigate the autohydrolysis of softwood, which is the main chemical operation in both hot water extraction and steam explosion. Control of the process and monitoring its course were ensured by the careful choice of experimental setup and conditions: a milled spruce material was extracted in a small flow-through reactor to minimize degradation of the dissolved material and to enable analysis of the resulting liquors extracted at selected time points. The obtained liquid and solid fractions were analyzed for sugar composition and acetic acid concentration. The results showed that partially degraded hemicelluloses were extracted; hemicelluloses side chains were cleaved off and detected as monomers, while deacetylation was limited. Chain scissions of cellulose were observed as a result of autohydrolysis.

The effect of optimizing the operating parameters of the washers on the washers’ efficiency and the overall economy of a mill, 2023 PEERS Conference