Permeability of citrus organic acid through DDS-acethylcellulose membrane

概要

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This work was undertaken to obtain some fundamental data for the concentration of citrus juice by reverse osmosis using acethylcellulose membrane. Some amounts of acid in citrus juice can be permeated through the membrane. This permeation of acid may be advantageous for Japaaese juice making, because citrus juices in Japan are often too acid.<BR>Organic acids in juice can be separated in membrane permeation to different extents under the operating condition used. The permeation is generally in the order monocarboxylic acid>dicarboxylic acid>hydroxycarboxylic acid. Organic acid retention depends upon the chemical nature of the molecule, and the order indicates that an increase in the polar functional groups in the molecule results in higher preferential sorption for water, and hence higher seperation in membrane permeation. Further, when the degree of dissociation of the acid molecule is increased, its separation also increased.
日本膜学会の論文