無水硫酸による脂肪酸のα-スルホン化に関する研究-2-

概要

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Palmitic acid was dissolved in carbon tetrachloride or tetrachloroethylene, and air-sulfur trioxide mixture was introduced into this solution under the various conditions. The absorption coefficient was measured at about 420mμ, to observe the coloring of the reaction mixture. "Teflon" tube showed most resistance to corrosion as gas inlet tubing. The coloring of the reaction mixture in which carbon tetrachloride was used as solvent was almost the same as in the case of terachloroethylene, at the same condition. While, the coloring of the reaction mixture was obviously different according to the method of introducing the gas mixture, namely, either the gas was introduced into the solution or over the surface of the solution, and the latter gave less coloring. The absorption coefficient of the reaction mixture increased linearly when the introduction of sulfur trioxide increased. In the case of such small-scale experiment, we cannot neglect the amount of sulfur trioxide which condensed on the inside wall of pipe and flask during the reaction. The amount of sulfur trioxide in the exhaust gas was only several percent of original sulfur trioxide introduced. The coloring of the solution began before true sulfonation reaction took place.
日本油化学会の論文