Abstract
Methylation of carboxylic acids in supercritical carbon dioxide modified with methanol was studied using a flow-through system with and without catalyst. Results without catalyst revealed the reactivity of the fluid itself, although the complete conversion was difficult. Using strong cation-exchanger with H form as catalyst allowed the complete conversion under milder conditions. Parameters, such as temperature, pressure and methanol concentration, were optimized taking account of the rapidity. Applicability of this method combined with solid-phase extraction was demonstrated for the analysis of phenoxyacetic acids in water.
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