Abstract
Microfluidic slug-flow is applied to supercritical extraction of ethyl acetate/water (EA/W) emulsions for production of polyvinyl alcohol (PVA) nanoparticle suspensions. The slug-flow in the microfluidic system was formed by supercritical carbon dioxide phase and EA/W emulsion. The ethyl acetate in the emulsion was extracted into the supercritical carbon dioxide under the microfluidic slug-flow. The extraction efficiency of ethyl acetate was studied at various space times, contact area between supercritical carbon dioxide phase and the emulsion and the hydrophobicity of PVA. The hydrophobicity of PVA strongly affected the extraction efficiency of ethyl acetate to supercritical carbon dioxide. Swelling of the ethyl acetate droplet in the emulsion by the dissolved carbon dioxide assisted the mass transfer from the droplet to the water phase in the emulsion. PVA nanoparticles with 10⿿20nm in diameter were formed in suspensions after the extraction.
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