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Journal articles
Open Access
Data for better maintenance plans and investments policy, Solutions! & TAPPI JOURNAL, August 2003, Vol. 2(8) (354KB)

Data for better maintenance plans and investments policy, Solutions! & TAPPI JOURNAL, August 2003, Vol. 2(8) (354KB)

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.

Journal articles
Open Access
On management: Does the pulp and paper industry have to lose the race?, TAPPI JOURNAL, January 1998, Vol. 81(1)

On management: does the pulp and paper industry have to lose the race?, TAPPI JOURNAL, January 1998, Vol. 81(1)

Journal articles
Open Access
Infrared analysis for process control in the pulp and paper industry, TAPPI JOURNAL, October 2000, Vol. 83(10)

Infrared analysis for process control in the pulp and paper industry, TAPPI JOURNAL, October 2000, Vol. 83(10)

Journal articles
Open Access
Application of polyallylamine as a dry strength agent for paper, TAPPI JOURNAL, December 2000, Vol. 83(12)

Application of polyallylamine as a dry strength agent for paper, TAPPI JOURNAL, December 2000, Vol. 83(12)

Journal articles
Open Access
Print mottle effect of binder migration and latex film formation during coating consolidation, TAPPI JOURNAL, May 1993, Vol. 76(5)

Print mottle effect of binder migration and latex film formation during coating consolidation, TAPPI JOURNAL, May 1993, Vol. 76(5)

Journal articles
Open Access
Wood recovery with In-woods flailing and chipping, TAPPI JOURNAL, September 1991, Vol. 74(9)

Wood recovery with In-woods flailing and chipping, TAPPI JOURNAL, September 1991, Vol. 74(9)

Journal articles
Open Access
Pulping of southern pine under low water, alkaline conditions using supercritical carbon dioxide-sulfur dioxide mixtures, TAPPI JOURNAL, July 1990, Vol. 73(7)

Pulping of southern pine under low water, alkaline conditions using supercritical carbon dioxide-sulfur dioxide mixtures, TAPPI JOURNAL, July 1990, Vol. 73(7)

Journal articles
Open Access
Bleaching at SAPPI's Ngodwana mill, TAPPI JOURNAL February 1989

Bleaching at SAPPI's Ngodwana mill, TAPPI JOURNAL February 1989

Journal articles
Open Access
Computer simulation of a material-handling and storage system, TAPPI JOURNAL July 1988

Computer simulation of a material-handling and storage system, TAPPI JOURNAL July 1988

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