Spontaneous surface convection in extraction of lanthanoids by di-2-ethylhexylphosphoric acid

Journal Article · Thu Sep 01 00:00:00 EDT 1988 · Colloid J. USSR (Engl. Transl.); (United States)

OSTI ID:6047088

Dupal, A Ya; Tarasov, V V; Yagodin, G A; Arutyunyan, V A

It has been established that when lanthanoids are extracted from aqueous nitric acid solutions (pH > 1.5) by di-2-ethylhexylphosphoric acid in decane or toluene a spontaneous surface convection occurs in the system over the initial period, which leads to an up to tenfold increase in the mass transfer coefficient. The intensity of the spontaneous surface convection (SSC) depends on the concentrations of the components and the conditions under which the extraction is conducted. With the passage of time an interphase film is formed at the interface which suppresses the SSC and retards the mass transfer. Small additions of ionic surfactants increase the surface viscosity, reducing any motion in the interphase region, which leads to an effective suppression of the SSC.

• Research Organization: D.I. Mendeleev Moscow Chemical Engineering Institute (USSR)
• OSTI ID: 6047088
• Journal Information: Colloid J. USSR (Engl. Transl.); (United States), Vol. 50:2; Other Information: Translated from Kolloidn. Zh.; 50: No. 2, 355-358(Mar-Apr 1988)
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CONVECTION
INHIBITION
RARE EARTHS
SOLVENT EXTRACTION
AQUEOUS SOLUTIONS
CHEMICAL REACTIONS
DECANE
EUROPIUM
EUROPIUM NITRATES
GADOLINIUM
GADOLINIUM NITRATES
LANTHANUM
LANTHANUM NITRATES
MASS TRANSFER
NITRIC ACID
PHOSPHORIC ACID ESTERS
QUANTITY RATIO
SOLVENT PROPERTIES
SURFACE PROPERTIES
SURFACTANTS
TOLUENE
VISCOSITY
YTTERBIUM
YTTERBIUM NITRATES
ALKANES
ALKYLATED AROMATICS
AROMATICS
DISPERSIONS
ELEMENTS
ENERGY TRANSFER
ESTERS
EUROPIUM COMPOUNDS
EXTRACTION
GADOLINIUM COMPOUNDS
HEAT TRANSFER
HYDROCARBONS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
LANTHANUM COMPOUNDS
METALS
MIXTURES
NITRATES
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
SEPARATION PROCESSES
SOLUTIONS
YTTERBIUM COMPOUNDS
400201* - Chemical & Physicochemical Properties