The aggregated particle cluster was re-dispersed when the oil was blended with a different high solvency oil, resulting in a higher emulsion stability.Ī high performance chemical demulsifier aggregated the sub-micron asphaltene/resins particles and effectively separated the water phase from the oil sludge by lowering the emulsion stability due to diminishing the particle-particle in U tactions. When the oil phase has a low solvency for the asphaltene/resins, the emulsion stability was decreased by diminishing the long-range particle structure due to the particle aggregation. The size distribution of the asphaltene/resins colloidal particles was affected by the type of the crude oil phase (solute-solvent interactions). The particle long-range structure stopped the film thinning during film drainage and stabilized the emulsion film. NP-I (Aerosil R972) and NP-II (Cloisite 20A) are hydrophobic particles therefore, they form water-in-oil emulsions.14 Indication of emulsion stability was. It was found that, when the effective volume concentration of the particles is sufficiently high and their polydispersity is low, the sub-micron particles form a layering structure inside the film. There is a growing need for emulsifiers that are ‘clean-label’ and biodegradable. W/O emulsions stabilized by surfactants, biopolymers and/or particles are reviewed. The dispersed subrnicron solid particles that are composed of asphaltene/resin particle stabilized the emulsion film formed between approaching the emulsion drops. Designing water-in-oil (W/O) emulsions is a promising strategy to incorporate water. For easy separation of tight emulsions, the surfactant is typically added. The effects of the colloidal particles on the stability of the water-in-oil emulsion formed in oily waste sludge were studied. The emulsions can be simply classified as follows: (1) loose emulsions wherein water separates within a few minutes (2) medium emulsions wherein water separates in tens of minutes and (3) tight emulsions where water separates in hours sometimes a day. Research Center, Korea Research Institute of Chemical Technology, Taejon 305-600, Korea Eng., Ansung National University, Kyunggi-Do 456-749, Korea 2Chem. Environmental Engineering Research 1997 2(3): 159-171.Įffect of Colloidal Particles on the Emulsion Stability in Oily Waste SludgeġDept.
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