Effect of pulping conditions and black liquor composition on Newtonian viscosity of high solids kraft black liquors

Journal Article · Thu Feb 01 04:00:00 EST 1996 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/ie950202h· OSTI ID:212213

Zaman, A A; Fricke, A L ^[1]

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1. Univ. of Florida, Gainesville, FL (United States). Dept. of Chemical Engineering

The influence of black liquor composition and solids concentrations on the Newtonian viscosity of slash pine black liquors over wide ranges of temperature (up to 140 C) and solids concentrations (between 50% and 83% solids) has been studied. It was found that the zero shear rate viscosity of high solids black liquors depends strongly on the cooking conditions and/or black liquor composition. Not only is high solids viscosity affected by lignin molecular weight and lignin concentration in the liquor but other organic and inorganic constituents of black liquor also make a significant contribution to viscosity. The dependency of zero shear rate viscosity on solids concentrations, and temperature is defined. The Newtonian viscosities vary over a wide range depending on temperature, solids concentrations and solids composition. The results indicate that, at fixed levels of effective alkali and sulfidity, the zero shear rate viscosities can be described as a function of both lignin concentration and lignin molecular weight. The viscosity of black liquor is an increasing function of the organics-to-inorganics ratio and is a decreasing function of the concentration of sodium and chloride ions and pH of the liquor.

• OSTI ID: 212213
• Journal Information: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 2 Vol. 35; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
CHEMICAL COMPOSITION
DELIGNIFICATION
PAPER INDUSTRY
PINES
RHEOLOGY
SPENT LIQUORS
VISCOSITY