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Tatsiana Savitskaya, Ivan Reznikov, Dmitry Grinshpan
Rheological Behavior of Lignin Based Dispersions Intended for Composite Fuel Production
Appl. Rheol. 26:6 (2016) 63476 (7 pages)
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Dispersions of acid hydrophobized hydrolysis lignin in light crude oil, industrial oil, and diesel fuel were found to demonstrate
the transition from Newtonian to non-Newtonian behavior with shear-thinning and thixotropy within the increase in lignin
concentration. Lignin-in-diesel fuel dispersions were shown to have the smallest apparent viscosity while lignin-in-industrial
oil dispersions have the highest one and the sharpest drop of viscosity with shear rate increasing. At the same time, relative
viscosity demonstrates the inverse dependence: It is highest for lignin-in-diesel fuel suspensions. Calculation of parameters
based on microrheological model of elastic flocs with generalized Casson equation allowed determining of the parameters k
and A that describe hydrodynamic interaction between separated particles and their aggregates under flow, parameter FA,
characterizing the force impeding the break of aggregates and numbers of particles in the floc for different systems as the
dependence of shear stress. The explanation based on a higher affinity of diesel fuel to lignin unlike industrial oil and light
crude oil as dispersing medium has been given.
► Cite this publication as follows:
Savitskaya T, Reznikov I, Grinshpan D: Rheological Behavior of Lignin Based Dispersions Intended for Composite Fuel Production, Appl. Rheol. 26 (2016) 63476.
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