Water transport in water-in-oil-in-water liquid emulsion membrane system for the separation of lactic acid

Journal Article · Tue Mar 01 00:00:00 EST 1994 · Separation Science and Technology; (United States)

DOI:https://doi.org/10.1080/01496399408005606· OSTI ID:7235945

Mok, Y S; Lee, W K ^[1]

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1. Korea Advanced Inst. of Science and Technology, Taejon (Korea, Republic of)

Liquid emulsion membranes (LEMs) were applied to the separation of lactic acid from an aqueous feed phase, and water transport (swelling) was investigated during the separation. Considering that as lactic acid was extracted into the internal stripping phase, osmotic pressure difference across the membrane was varied, the water transfer coefficient was evaluated. The water transfer coefficient was larger at higher carrier concentration and initial lactic acid concentration, which means that emulsion swelling can also be mediated by solute/carrier complexes although it is, in general, osmotically induced. The appropriate LEM formulation was given for separation and concentration of lactic acid. If both separation and concentration are desired, evidently emulsion swelling should be considered in conjunction with the transport rate of lactic acid. It was observed that the separated solute concentration in the internal phase was lowered due to swelling during the operation. Nevertheless, lactic acid could be concentrated in the internal phase more than 6 times in specific conditions, indicating that as the volume ratio of external phase to internal phase is increased, a still higher concentration in the internal phase can be obtained. 22 refs., 10 figs., 4 tabs.

• OSTI ID: 7235945
• Journal Information: Separation Science and Technology; (United States), Vol. 29:6; ISSN 0149-6395
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
EMULSIONS
SWELLING
LACTIC ACID
EXTRACTION
SUPPORTED LIQUID MEMBRANES
PERMEABILITY
AQUEOUS SOLUTIONS
COMPILED DATA
COMPLEXES
DROPLETS
INTERFACES
MASS TRANSFER
MATHEMATICAL MODELS
OSMOSIS
SEPARATION PROCESSES
CARBOXYLIC ACIDS
COLLOIDS
DATA
DIFFUSION
DISPERSIONS
HYDROXY ACIDS
INFORMATION
MEMBRANES
MIXTURES
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
PARTICLES
SOLUTIONS
400105* - Separation Procedures
400201 - Chemical & Physicochemical Properties
661300 - Other Aspects of Physical Science- (1992-)