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Journal articles
Open Access
Transfer of cationic retention aid from fibers to fine particles and cleavage of polymer chains under wet-end papermaking conditions, TAPPI JOURNAL, May 1993, Vol. 76(5)

Transfer of cationic retention aid from fibers to fine particles and cleavage of polymer chains under wet-end papermaking conditions, TAPPI JOURNAL, May 1993, Vol. 76(5)

Journal articles
Open Access
Bleaching and brightness stability of aspen biomechanical pulps, TAPPI JOURNAL, November 1993, Vol. 76(11)

Bleaching and brightness stability of aspen biomechanical pulps, TAPPI JOURNAL, November 1993, Vol. 76(11)

Journal articles
Open Access
Steam drying and fluidized-bed calcination of lime and mud, TAPPI JOURNAL, November 1993, Vol. 76(11)

Steam drying and fluidized-bed calcination of lime and mud, TAPPI JOURNAL, November 1993, Vol. 76(11)

Journal articles
Open Access
Bleaching deinked pulps, TAPPI JOURNAL, January 1991, Vol. 74(1)

Bleaching deinked pulps, TAPPI JOURNAL, January 1991, Vol. 74(1)

Journal articles
Open Access
Fine paper properties and the effects of wet-end starch when using deinked recycled fiber in an alkaline system, TAPPI JOURNAL, May 1991, Vol. 74(5)

Fine paper properties and the effects of wet-end starch when using deinked recycled fiber in an alkaline system, TAPPI JOURNAL, May 1991, Vol. 74(5)

Journal articles
Open Access
Thermomechanical pulping of douglas-fir: mill and lab experiences at smurfit newsprint corp., TAPPI JOURNAL, October 1991, Vol. 74(10)

Thermomechanical pulping of douglas-fir: mill and lab experiences at smurfit newsprint corp., TAPPI JOURNAL, October 1991, Vol. 74(10)

Journal articles
Open Access
Effect of fungal pretreatment on strength and optical properties of softwood and hardwood kraft pulps, TAPPI JOURNAL, October 1991, Vol. 74(10)

Effect of fungal pretreatment on strength and optical properties of softwood and hardwood kraft pulps, TAPPI JOURNAL, October 1991, Vol. 74(10)

Journal articles
Open Access
Survey of disc chippers in roundwood chipping yards of southeastern united states, TAPPI JOURNAL, December 1992, Vol. 75(12)

Survey of disc chippers in roundwood chipping yards of southeastern united states, TAPPI JOURNAL, December 1992, Vol. 75(12)

Journal articles
Open Access
Tools for successful wet-end chemistry control, TAPPI JOURNAL, December 1992, Vol. 75(12)

Tools for successful wet-end chemistry control, TAPPI JOURNAL, December 1992, Vol. 75(12)

Journal articles
Magazine articles
Open Access
Eucalyptus black liquor properties in a lignin extraction process: density, dry solids, viscosity, inorganic, and organic content, TAPPI Journal March 2023

ABSTRACT: Extracting lignin from black liquor is becoming more common, although only a few research papers discuss the impact of the process on the liquor’s primary properties. This work aims to determine the changes in black liquor properties as it undergoes a lignin extraction process using carbon dioxide (CO2). A diluted eucalyptus black liquor sample (DBL) was acidified with CO2 to a final pH of 8.5. After filtration, the kraft lignin was removed, and the filtrated lignin lean black liquor (LLBL) was collected. Five acidified black liquors (ABL) samples were collected during acidification at pH 10.5; 10.0; 9.5; 9.0; and 8.5. The samples were analyzed regarding lignin content in solution, sodium carbonate (Na2CO3), sodium sulfate (Na2SO4), density, dry solids content, and viscosity. While Na2SO4 remained almost constant, Na2CO3 presented an enormous increase in its concentration when comparing DBL with LLBL. As pH decreased, the lignin content in the solution was also reduced due to lignin precipitation. The results showed similar behavior for dry solids, density, and viscosity of the supernatant, but an increase in density was observed around pH 9.00. In light of this, the density of LLBL turns out to be closer to the one in the initial DBL. The significant increase in carbonate content could explain this behavior during acidification with CO2 once the inorganic content significantly influences the property. The viscosity was determined from 10 s-1 to 2000 s-1. We observed a Newtonian behavior for all samples. The increase in carbonate content in the sample is crucial information to the recovery cycle, especially for calculating the mass and energy balance when targeting the use of the LLBL.

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