A serious hindrance to the use of multiple extraction or countercurrent distribution for separating mixtures of closely related compounds Is the amount of labor involved in making the extractions.The apparatus described here permits several thousand almost quantitative extractions in a few hours of operation. Two other types of supplementary extractors are

Butene-2 produces higher concentrations of Cs isomers than does isobutylene.The branched Ci, olefins produce higher concentrations of C9 isomers than do the C4 olefins, but much lower concentrations than are produced by pentene-2.The branched C4 and Ce olefins produce higher concentrations of C10and-heavier components than do the linear C4 and C5 olefins.The position of unsaturation appears to be irrelevant, at least in the case of branched C5 olefins, since the alkylates produced are very similar.The HF alkylates contain higher concentrations of Cs isomers than do the H2S04 alkylates.The diastereomers of 2,3,4-trimethylhexane (21) are produced in an approximately 2:1 ratio regardless of feed composition or acid catalyst employed.

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