Abstract
Fatty acids are an interesting class of educts for chemical processes as they are available from renewable resources. For obtaining high-purity fatty acids, efficient separation techniques are needed. An interesting option is adsorption. In the present work, therefore, the adsorption of oleic acid on hydrotalcite, a readily available adsorbent, is studied. The focus is on studying the influence of the composition of the solvent on the adsorption. Adsorption isotherms are reported for oleic acid in pure isopropanol and mixtures of isopropanol and water at temperatures between 278 and 308 K. Even though the solubility of oleic acid in isopropanol is higher than in mixtures of isopropanol and water, the highest capacity of the adsorber is found for pure isopropanol. The reasons are discussed. No significant influence of the temperature was observed.
Highlights
Fatty acids are interesting educts for the chemical industry as they are available from renewable resources and offer opportunities for new synthesis routes, e.g. for producing polymers (Baumann et al, 1988; Biermann et al, 2000)
Froscher and Hasse solvent for Oleic acid (OA) than water (OA is practically insoluble in water, whereas iPOH is a good solvent for OA), we find that the adsorption of OA on the hydrotalcite is highest for pure iPOH
We have studied the adsorption of OA on hydrotalcite
Summary
Fatty acids are interesting educts for the chemical industry as they are available from renewable resources and offer opportunities for new synthesis routes, e.g. for producing polymers (Baumann et al, 1988; Biermann et al, 2000). Keywords Adsorption, oleic acid, hydrotalcite, layered-double hydroxide, isopropanol Adsorption of OA has been studied by Cren and Meirelles (2005, 2012), who have shown that strong anion-exchange resins can be used for removing OA from ethanolic solutions containing water.
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