Gas chromatography of chlorobenzenes in mixtures

The investigation was carried out in an attempt to select the most suitable column packings for complete and rapid separation of chlorobenzenes in mixtures by gas chromatography. Chromatograms were measured with use of six kinds of column packings; (1) Bentone-34, (2) P. E. G.-6000, (3) P. E. G.-6000+Bentone-34 (series column method), (4) D. I. D. P.+Bentone-34 (blended liquid phase method), (5) 7, 8-benzoquinoline and (6) T. T. P. Results indicate that both (3) and (4) are more useful for gas chromatographic analysis of the chlorobenzenes in mixtures than the other four. The following measurement conditions give high peak resolutions (1.60 or more) and short retention times (within about 20 minutes) for all components; column (3) : P. E. G.-6000 25 w/w% 75 cm+Bentone-34 10w/w% 225 cm in series, 140°C, N2 40 ml/min, 0.1 μl, column (4): D. I. D. P. 5w/w%+Bentone-34 5w/w%, blended liquid phase, 225 cm, 120°C, N2 30 ml/min, 0.1 μl. It is also recognized that ο-dichlorobenzene is eluted later than 1, 2, 4-trichlorobenzene from the Bentone-34 column, quite contrary as to have been referred to.