Multidimensional Gas Chromatographic Analysis of Hexene Hydroformylation Products Using Support-Coated Open- Tubular Columns with Column Sequence Reversal ("Foreflushing")

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Abstract
A multidimensional gas chromatographic method using foreflushing or column sequence reversal for the analysis of hexene hydroformylation is described. Using support-coated open-tubular columns of Carbowax 20M and squalane, resolution is achieved for the isomeric heptanals; byproduct formates, alcohols, and high-boiling condensation products; and the hexene isomers derived from propylene dimerization with a single sample injection. All components are detected on a single flame ionization detector with quantification based on methylcyclopentane added as an internal standard. The heptanal isomer distribution was confirmed by analysis of the heptanol isomers resulting from the sodium borohydride reduction of the reaction products; the alcohols were analyzed as the trimethylsilyl derivatives.

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