Demulsifiers


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Demulsifiers

 

in petroleum production, substances aiding the destruction of emulsions formed from petroleum and water. Upon introducing demulsifiers into an emulsion, they are adsorbed on the surface layer of particles of the dispersed phase (so-called drops), forming around the drops a new layer saturated with demulsifier and of lower mechanical strength. Owing to this, on collision of the drops their coalescence and also the destruction of the emulsion are facilitated. In the USSR the theory of emulsion destruction has been worked out by the school of Academician P. A. Rebinder and in the USA, by I. Langmuir.

The main user of demulsifiers (consuming tens of thousands of tons a year) is the petroleum industry, in petroleum refineries, where demulsifiers are used to dewater and desalt petroleum. In destroying emulsions of the “water in petroleum” type, the demulsifier consumption varies from a few tens to a few hundreds of grams per ton of emulsion. Demulsifiers for destroying “water in petroleum” type emulsions are nonionic surface-active agents whose synthesis is based on ethylene oxide and propylene oxide.

A. I. ARUTIUNOV

References in periodicals archive ?
KNPC has coordinated and worked with the authority specialized in radiations in the country on measuring radiation rates in the demulsifiers of heavy crude reactors, where the fire broke out, Al-Asousi, who is also KNPC's Deputy CEO for Support Services, noted.
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They discuss tribological, nanotribological, molecular packing, and mechanical properties of silane, thio, phthalocyanine, and phospholipid films, membranes, grafts, and self-assembled monolayers on gold, silica, and graphite substrates, and water-in-oil emulsions used as oil well drilling fluids, wetting and tribological properties of organized surfactant assemblies and aqueous solutions of alkyl polyglucosides, surfactants as demulsifiers in enhanced crude oil production from old wells, and oil-in-water emulsions with biobased surfactants.
of Stavanger, Norway) covers the chemical foundations for water and gas control, scale control, asphaltene control, acid stimulation, sand control, corrosion control during production, gas hydrate control, wax control, demulsifiers, foam control, flocculants, biocides, scavengers and drag-reducing agents.
Lu, "The Resolution of Water-in-Crude Oil Emulsions by the Addition of Low Molar Mass Demulsifiers," Journal of Colloid and Interface Science 139, 128-138 (1990).
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