INDUSTRIALAND ENGINEERING CHEMISTRY 857 lation to remove the 2,2,4-trimethylpentane first, then the charging stock for demethylation. The reaction product was fractionated, and the unconverted material was recycled to the reaction zone.The following are the over-all yields starting with 100% of hot-acid isooctane:These data indicate that approximately 36 volumes of triptane, having a purity in excess of 83%, can be obtained from 100 volumes of hot acid isooctane, along with about 19 volumes of 2,2,4-trimethylpentane and smaller volumes of 2,3-dimethylpentane and 2,3-dimethylbutane.

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