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Synergistic solubility behaviour of a polyoxyalkylene block co-polymer and its precipitation from liquid CO2-expanded ethanol as solid microparticles by Maria Muntó; Nora Ventosa; Jaume Veciana is a Engineering article available to read on EtoBox.

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The solubility behaviour of a polyoxyalkylene block co-polymer surfactant, known as poloxamer F-127, in liquid ethanol/CO 2 solvent mixtures at P = 10 MPa and T = 298 K, has been determined. Such a polymer presents a solubility in ethanol/CO 2 mixtures that is one or two orders of magnitude larger than in both pure liquids. This synergistic behaviour of ethanol and liquid CO 2 to solubilize the poloxamer F-127 has permitted the obtaining of solid particles of the poloxamer suspended in ethanol by depressurising its solutions in liquid ethanol/CO 2 mixtures, since the polymer is almost insoluble in the resulting ethanol. This precipitation procedure yields microparticulate solids of the poloxamer with mean particle sizes between 1 and 20 m. The effects of various operational parameters, like the initial polymer concentration and the CO 2 content in the solution, on the resulting mean particle sizes and particle size distribution has been also studied.

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Author

Maria Muntó; Nora Ventosa; Jaume Veciana

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0896-8446)

Published

2008

Language

EN

Field

Engineering (Physical Sciences)