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Magazine articles
Open Access
Optical properties of pulp and paperâ?? New standardization proposals, December 1995 Tappi Journal [95Dec45.pdf]

Optical properties of pulp and paper - new standardization proposals, TAPPI JOURNAL, December 1995, Vol. 78(12)

Magazine articles
Open Access
Mönsterås going 100% TCF as it increases production and minimizes emissions, December 1995 Tappi Journal [95Dec49.pdf]

Monsteras going 100% tcf as it increases production and minimizes emissions, TAPPI JOURNAL, December 1995, Vol. 78(12)

Magazine articles
Open Access
Beauty or the beast: life after iso 9000, TAPPI JOURNAL, October 1994, Vol. 77(10)

Beauty or the beast: life after iso 9000, TAPPI JOURNAL, October 1994, Vol. 77(10)

Magazine articles
Open Access
1995 TAPPI foundation/af&pa conference: paper industry research challenges, TAPPI JOURNAL, April 1996, Vol. 79(4)

1995 TAPPI foundation/af&pa conference: paper industry research challenges, TAPPI JOURNAL, April 1996, Vol. 79(4)

Magazine articles
Open Access
Catastrophic failure of cast iron dryer roll caused by severe erosion resulting from spoiler bar failures, TAPPI JOURNAL, April 1996, Vol. 79(4)

Catastrophic failure of cast iron dryer roll caused by severe erosion resulting from spoiler bar failures, TAPPI JOURNAL, April 1996, Vol. 79(4)

Magazine articles
Open Access
The global wood fiber equation - a new world order?, TAPPI JOURNAL, January 1996, Vol. 79(1)

The global wood fiber equation - a new world order?, TAPPI JOURNAL, January 1996, Vol. 79(1)

Magazine articles
Open Access
Vision of the future, TAPPI JOURNAL, November 1996, Vol. 79(11)

Vision of the future, TAPPI JOURNAL, November 1996, Vol. 79(11)

Magazine articles
Open Access
A visit to mount st. helens; meta lake illustrates natural recovery following volcanic eruption, TAPPI JOURNAL, April 1994, Vol. 77(4)

A visit to mount st. helens; meta lake illustrates natural recovery following volcanic eruption, TAPPI JOURNAL, April 1994, Vol. 77(4)

Magazine articles
Open Access
Hot-melt adhesive development and the proliferation of raw materials, TAPPI JOURNAL, September 1991, Vol. 74(9)

Hot-melt adhesive development and the proliferation of raw materials, TAPPI JOURNAL, September 1991, Vol. 74(9)

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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