Analytical Reaction Gas Chromatography by Viktor G. Berezkin

By Viktor G. Berezkin

The main common and powerful technique for the research of advanced multicomponent combinations of risky ingredients is gasoline chromatography. in spite of the fact that, there are various obstacles asso­ ciated with the classical edition of this method which retard its improvement and the extra growth of its software: 1) the id of the elements of a fancy combine­ ture of unknown composition is in itself a fancy and tough challenge, except the homologous sequence of the part of be pointed out is understood; 2) the overlapping of chromatographic peaks for numerous compounds makes it tough, and in a couple of circumstances very unlikely, to hold out qualitative and quantitative research of those elements, and results in the need of utilizing numerous columns of alternative polarities or to using columns with very excessive potency; three) the direct research of risky and nonvolatile compounds is most unlikely; four) the trouble of quantitative chromatographic research utilizing thermal conductivity detectors raises with the need of opting for person reaction (calibration) components; the insensitivity of the flame ionization detector to a couple of ingredients (inorganic gases) results in the need of introducing extra operations (prelimi­ nary focus of hint elements) in reference to thermal conductivity detectors. vii viii FOREWORD The directed use of chemical conversion of the compounds analyzed frequently makes it attainable to take away the constraints stated above.

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3. 4. 5. 6. 7. 8. 9. A. Keulemans, Gas Chromatography, Reinhold, New York, 1957 [Russian translation: IL, Moscow, 1959]. V. G. Berezkin, O. L. Gorshunov, and M. A. Geiderich, Plast. Massy, No. 11:53 (1965). J. E. Hoff and E. D. Feit, Anal. , 36:1002 (1964). N. H. Ray, Analyst, 80:853 (1955). M. W. Anders and G. J. Mannering, Anal. , 34:730 (1962). R. L. Martin, Anal. , 32:336 (1960). W. B. Innes, W. E. Bambrick, and A. J. Andreatch, Anal. , 35:1198 (1963). V. G. Berezkin, A. E. Mysak, and L. S.

I. Henderson and J. H. Knox, J. Chern. , 2299 (1956). Chapter IV The Analysis of Complex Mixtures Reaction gas chromatography can be most successfully used in analyzing complex mixtures composed of compounds of different classes, each characterized by a different reactivity. In such cases the group reactivities rapidly identify the group composition for the sampie and type of compound which corresponds to each chromatographie peak.. This simplifies the subsequent identification of the individual peaks significantly.

5 g; temperature, 299°C; flow rate of helium (hydrogen), 60-70 ml/min. Dehydrogenation is a more complex process, which is often accompanied by side reactions. Cyclopentane homologs are converted into aromatic hydrocarbons to a much lesser degree than the cyclohexane homologs . As general methods for the analysis of complex hydrocarbon mixtures, Rowan suggested carrying out dehydrogenation of a mixture of isoparaffins and naphthenes for the selective determination of the concentration of cyclohexanes with the help of the peaks cor- HYDROGENATION AND DEHYDROGENATION 55 responding to the aromatic hydrocarbons formed, and also the utilization of hydrogenation at room temperature for the selective conversion of the olefins to the corresponding paraffins.

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