Effect of non-ionic surfactants on interfacial rheological properties of crude oil/water systems

  • J. Lakatos-Szabó
  • I. Lakatos
Conference paper
First Online:
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 105)

Abstract

Interfacial rheological properties of different Hungarian crude oil/water systems were determined in wide temperature and shear rate range and in the presence of ethoxylated nonyl-phenols with ethoxy group number between 10 and 40. The fundamental conclusion of the experimental results is that the interfacial viscosity, the non-Newtonian flow behavior and the activation energy of the viscous flow drastically decrease in the presence of non-ionic surfactants. Modification of these interfacial rheological properties increase with decreasing ethoxy group number and increasing tenside concentration and temperature. The most radical change was observed in the presence of NPEO10. As a summary it was evidenced that the interfacial rheology is an efficient and powerful detection technique, which may enhance our knowledge on formation, structure, properties and behavior of interfacial layers formed in oil/water systems. Thus, similar studies will probably accelerate the progress significantly not only in oil recovery but also in all areas of colloid science and technology.

Key words

Surfactants non-ionic tensides interfacial rheology oil-water interface rigid films 

Symbols

cs

tenside concentration, g/l

k

preexponent constant (Ostwald's constant), dimensionless

n

shear thinning index (Ostwald's constant), dimensionless

nEO

ethoxy group number, dimensionless

t

ageing time, h

ΔG*

activation energy of the viscous flow, kJ/mol

T

temperature, K

γ

shear rate, 1/s

ηs

interfacial viscosity, mN s/m

τr

rotation relaxation time (Carreau's constant), s

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Copyright information

© Steinkopff Verlag 1997

Authors and Affiliations

  • J. Lakatos-Szabó
    • 1
  • I. Lakatos
    • 1
  1. 1.Research Laboratory for Mining ChemistryHungarian Academy of SciencesMiskolc-EgyetemvárosHungary

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