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Destabilization-Enhanced Centrifugation of Metalworking Oil-in-Water Emulsions: Effect of Demulsifying Agents

✍ Scribed by D. Allende; Á. Cambiella; J. M. Benito; C. Pazos; J. Coca

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
541 KB
Volume
31
Category
Article
ISSN
0930-7516

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✦ Synopsis

Abstract

The effect of a commercial flocculant (Alpacon® WS009) and two coagulant salts (CaCl~2~ and AlCl~3~) on the stability of metalworking oil‐in‐water (O/W) emulsions was examined. Two O/W emulsions were tested: a fresh emulsion, prepared in the laboratory from a commercial concentrate, and a waste metalworking emulsion, provided by a local waste management company, with initial oil concentrations of 32900 and 16900 mg/L, respectively. The emulsion stability was studied at different demulsifier concentrations, temperatures and pH through centrifugation tests, zeta potential and multiple light scattering measurements. Emulsion breakdown is explained by electrostatic repulsion of oil droplets and steric interactions. The former was observed for the laboratory emulsion, while the latter was observed for the waste emulsion. Aluminum chloride was the only effective agent for demulsifying both emulsions.

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The interfacial rheological properties of the crude oil-water interface have been measured. It is found that the rheological properties are time dependent and the film takes at least 8 h to attain equilibrium. During this period the surface elasticity and viscosity increase markedly with time, with