含ヨウ素ジメチルホルムアミドを用いるn-オレフィンの選択的抽出分離

抄録

The selective extraction of n-olefins from n-olefin/n-paraffin mixture using an iodine-dimethylformamide (DMF) solution was studied. Iodine dissolved in DMF absorbed n-olefin at ambient temperature, forming a DMF-I₂-olefin complex (Fig.-1).
This complex was decomposed on heating at temperatures above 85°C, liberating the absorved olefin (Fig.-2). However, the I₂-DMF solution, after olefin liberation, was no longer able to absorb olefins repeatedly even at ambient temperature.
The addition of the excess amounts of other olefins, which can be separated by distillation from the recovered olefin, to the DMF-I₂-olefin complex liberated the absorbed olefin by replacement at ambient temperature (Fig.-3). A remarkable effect of light irradiation on this replacement rate was observed (Fig.-4).
To study the industrial applications of this selective extraction method, a C₁₀-C₁₃ n-olefin/n-paraffin mixture, a raw material for the production of linear detergent alkylate, was used. Normal-olefin having a purity of 94.6% was recovered from the mixture (Table-3).