사슬길이가 다른 알킬벤젠 술폰산 수용액에서 이소부틸렌의 반응성 흡수와 용해도

Abstract

In the aqueous solutions of p-toluenesulfonic acid, ethylbenzenesulfonic acid, dodecylbenzenesulfonic acid, and sulfuric acid, the solubilities of isobutylene were determined by the volumetric method at 33℃. Followirg the pseudobinary complexation model, the activities of isobutylene were determined for all acids, based on the Wilson model incorporated with the chemical theory. In solubilizing isobutylene, the significant increase of the equilibrium constant K, and the chemical conversion to tert-butyl alcohol suggested that the chemical complexation of isobutylene with acids might play a key role in the mechanism of the solubilization. By increasing the chain length of alkylbenzenesulfonic acids, it is also found that the efficiencies of acids in solubilizing isobutylene were enhanced al lower concentrations, but significantly reduced at higher concentrations. After a transition concentration where there appeared minima, the efficiencies of acids were greatly enhanced. indicating that the chemical conversion to t-butyl alcohol is triggered by acids. Further, the solubilizing efficiencies of mixed acids consisting of p-toluenesulfonic acid and dodecylbenzenesulfonic acid, linearly decreased depending on the effective chain length at a fixed molar concentration of acids, and it may be attributed to the formation of complexby acid rather than to the incorporation of isubutylene into the micelles.