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By V.G. Berezkin

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2-2A). Using molecular sieve 13X it is possible to separate paraffinic and naphthenic hydrocarbons according to carbon number [22]. However, the retention of high boiling hydrocarbons was very high. 5 h (see Fig. 2-3a [21]). 3 ym porous layer, C I I hydrocarbons elute at 400 "C (see Fig. 2-3b [21]). ALOT column permits to decrease the maximal separation temperature (400 "C instead of 500 "C). 3 Some Peculiarities of Capillary Adsorption Columns Fast analysis of volatile compounds is very important for chromatographic practice because permanent gases and low molecular weight organic compounds are frequently found in process steam and air-environmental samples.

I 100 , I , min Fig. 2-3a Separation of naphthenic and paraffinic fractions in naphtha [21]. Column: 5 m x 3 mm, adsorbent: Molsieve 13X, temperature: 150 "C, then 4"/min to 500 "C, carrier gas: hydrogen, direct injection, detector: FID. Capillary Gas-Solid Chromatography 31 ~ D 0 10 5 15 20 25 min Fig. 5 mm, adsorbent: Molsieve 13X, temperature: 150 "C,carrier gas: hydrogen, split injection, detector: FID. "C, of 35 ml/min. The separation of all components is very good and the analysis time is comparatively short (Fig.

B) The same but having uncoated capillary tubing between outlet and detector. (c) The same but having uncoated capillary tubing between injection and column inlet [60]. 30 mm, coated with SE-30 methylsilicone. d. Column temperature: programmed from 40°C at 5"/min. Split injection, 1:25, injector temperature 280 "C. Carrier gas: hydrogen30 cm/s. Peaks: 1 - 2,3-butanediol, 2 - n-decane, 3 - 1-octanol, 4 - 2,6-dimethylphenol, 5 - nonanol, 6 - n-undecane, 7 - 2,6-dimethylaniline, 8 - decanoic acid methyl ester, 9 - dicyclohexylamine, 10 - undecanoic acid methyl ester, 11 - dodecanoic acid methyl ester.

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