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Journal articles
Open Access
Prediction of metals distribution in mill processes, Part 2: Fiber line metals profiles, Solutions! & TAPPI JOURNAL, February 2004, Vol. 3(2) (234KB)

Prediction of metals distribution in mill processes, Part 2: Fiber line metals profiles, Solutions! & TAPPI JOURNAL, February 2004, Vol. 3(2) (234KB)

Journal articles
Open Access
Biopulping of whole jute plant in soda-anthraquinone (AQ) and kraft processes, TAPPI JOURNAL & Solutions! March 2005, Vol. 4(3)

Biopulping of whole jute plant in soda-anthraquinone (AQ) and kraft processes, TAPPI JOURNAL & Solutions! March 2005, Vol. 4(3)

Journal articles
Open Access
An investigation of factors affecting steambox heating effectiveness, TAPPI JOURNAL, September 2002 (165KB)

An investigation of factors affecting steambox heating effectiveness, Solutions! & TAPPI JOURNAL, September 2002 (165KB)

Journal articles
Open Access
Visualizations of offset and flexographic inks at bubble surfaces, TAPPI JOURNAL, March 2002 (251KB)

Visualizations of offset and flexographic inks at bubble surfaces, SOLUTIONS & TAPPI JOURNAL, March 2002 (251KB)

Journal articles
Open Access
Catalysis and activation of oxygen and peroxide delignification of chemical pulps: A review, TAPPI JOURNAL, April 2002 (38KB)

Catalysis and activation of oxygen and peroxide delignification of chemical pulps: A review, SOLUTIONS! & TAPPI JOURNAL, April 2002 (38KB)

Journal articles
Open Access
Dynamic modeling of potassium and chloride in the recovery area, TAPPI JOURNAL, June 2002 (85KB)

Dynamic modeling of potassium and chloride in the recovery area, Solutions! & TAPPI JOURNAL, June 2002 (85KB)

Journal articles
Open Access
Energy consequences in minimum effluent market kraft pulp mills, TAPPI JOURNAL, November 2002, Vol. 1(9) (426KB)

Energy consequences in minimum effluent market kraft pulp mills, Solutions! & TAPPI JOURNAL, November 2002, Vol. 1(9) (426KB)

Journal articles
Open Access
Dust and flue gas chemistry during rapid changes in the operation of black liquor recovery boilers: Part 1â??Dust formation, TAPPI JOURNAL, July 2002 (118KB)

Dust and flue gas chemistry during rapid changes in the operation of black liquor recovery boilers: Part 1—Dust formation, Solutions! & TAPPI JOURNAL, July 2002 (118KB)

Journal articles
Open Access
Apparent and actual delignification response in industrial oxygenâ??alkali delignification of birch kraft pulp, TAPPI JOURNAL, October 2003, Vol. 2(10) (128KB)

Apparent and actual delignification response in industrial oxygen–alkali delignification of birch kraft pulp, Solutions! & TAPPI JOURNAL, October 2003, Vol. 2(10) (128KB)

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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