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Magazine articles
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.
Magazine articles
The industry: beyond 2000, TAPPI JOURNAL, October 1998, Vol.81(10)
The industry: beyond 2000, TAPPI JOURNAL, October 1998, Vol.81(10)
Magazine articles
Using climate change policies for u.s. pulp and paper industry efficiency, TAPPI JOURNAL, July 2000, Vol. 83(7)
Using climate change policies for u.s. pulp and paper industry efficiency, TAPPI JOURNAL, July 2000, Vol. 83(7)
Magazine articles
What's new with tappi test methods?, TAPPI JOURNAL, September 2000, Vol. 83(9)
What's new with tappi test methods?, TAPPI JOURNAL, September 2000, Vol. 83(9)
Magazine articles
Conversion from acid to alkaline with a film transfer size press, TAPPI JOURNAL, June 1991, Vol. 74(6)
Conversion from acid to alkaline with a film transfer size press, TAPPI JOURNAL, June 1991, Vol. 74(6)
Magazine articles
Operations teams run a woodyard, TAPPI JOURNAL, December 1996, Vol. 79(12)
Operations teams run a woodyard, TAPPI JOURNAL, December 1996, Vol. 79(12)
Magazine articles
1995 pulping conference succees with opportunities to participate, TAPPI JOURNAL, May 1996, Vol. 79(5)
1995 pulping conference succees with opportunities to participate, TAPPI JOURNAL, May 1996, Vol. 79(5)
Magazine articles
A financial analysis of north american pulp and paper companies, TAPPI JOURNAL, July 2000, Vol. 83(7)
A financial analysis of north american pulp and paper companies, TAPPI JOURNAL, July 2000, Vol. 83(7)
Magazine articles
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
Environmental issues continue to be a major industry concern, TAPPI JOURNAL, September 2000, Vol. 83(9)
Environmental issues continue to be a major industry concern, TAPPI JOURNAL, September 2000, Vol. 83(9)