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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 45 (1973), S. 1557-1559 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1612-1112
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Modifiziertes Silicagel ist ein vielversprechendes Adsorbens für die präparative Gas-Chromatographie. Die Abweichungen der tatsächlich erhaltenen Peaks von den theoretischen Gauß-Peaks wurden untersucht. Die Symmetrie der Peaks als Funktion der Trägergas-Strömungsgeschwindigkeit wird diskutiert. Die Isolierung einer Anzahl von Kohlenwasserstoffen durch die präparative Adsorptions-Fest-Gas-Chromatographie wird beschrieben.
    Abstract: Résumé Le gel de silice modifié est un adsorbant prometteur pour la chromatographie préparative. Les différences entre la forme des pics et la courbe théorique de Gauss ont été étudiées. La symétrie des pics est étudiée en fonction de la vitesse du gaz vecteur. On décrit l'isolement d'un certain nombre d'hydrocarbures par chromatographie d'adsorption gaz-solide préparative.
    Notes: Summary Modified silica gel is a promising adsorbent for preparative chromatography. The deviation of actual peaks from the theoretical Gaussian peaks have been investigated. The symmetry of the peaks is discussed as a function of the carrier gas velocity. The isolation of a number of hydrocarbons by preparative gas solid adsorption chromatography is described.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1612-1112
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Arbeit befaßt sich mit der Wirkung von Strömungsgeschwindigkeit und Art des Trägergases, sowie mit dem Wert des Temperatur-Koeffizienten nach Henry auf die Kapazität und Wirksamkeit von Adsorptionssäulen für die präparative Fest-Gas-Chromatographie. Die theoretische Beziehung zwischen Bodenzahl (HETP) und Versuchsbedingungen bei Überladung wurde vonDe Wet undPretorius [1] emittelt und von uns etwas abgewandelt [2]. Obwohl sie unter der Voraussetzung einer linearen Adsorptionsisotherme abgeleitet wurde, zeigte die Gleichung gute Übereinstimmungmit den experimentell erhaltenen Ergebnissen bei der Trennung in einer Verteilungssäule. Daraufhin untersuchten wir die Anwendbarkeit dieser Gleichung für Trennungen auf Adsorptionssäulen für die Gas-Fest-Chromatographie, die mit modifiziertem Silicagel gefüllt waren; weiterhin versuchten wir die optimalen Eigenschaften der Adsorbentien und die optimalen Trennbedingungen zu ermitteln. Die Abhängigkeit der Belastbarkeit von den Trennbedingungen, die in einer früheren Arbeit [3] von uns schon theoretisch abgeleitet worden war, wurde ebenfalls untersucht.
    Abstract: Résumé Dans ce travail on étudie les effets de la vitesse, de la nature du gaz vecteur, ainsi que de la valeur du coefficient de température selon Henry, sur la capacité et l'efficacité de colonnes adsorbantes en chromatographie préparative gaz-solide. La relation théorique entre la hauteur équivalente d'un plateau théorique (HETP) et les paramètres expérimentaux, dans des conditions de surcharge, a été établie parDe Wet etPretorius [1] et légèrement modifiée par nous [2]. Bien que cette relation füt obtenue en supposant que l'isotherme d'adsorption est linéaire, on trouve une bonne concordance qualitative avec les résultats expérimentaux de la chromatographie de partage. Par conséquent nous avons étudié la validité de cette équation pour des séparations sur colonnes adsorbantes en chromatographie gaz-solide (silice modifié); en outre nous avons essayé d'établir les caractéristiques optimales des adsorbants et les conditions de séparation optimales. On a étudié la relation existant entre la capacité et les conditions de séparation, en tenant compte des équations théoriques établies par nous dans un travail antérieur [3].
    Notes: Summary The paper discusses the effects of the flow rate and the nature of the carrier gas, and the value of the Henry temperature coefficient on the capacity and effciency of preparative gas-solid adsorption columns. The theoretical relationship between the height equivalent of a theoretical plate (HETP) and the experimental parameters under overloaded conditions was obtained byDe Wet andPretorius [1] and somewhat modified by us [2]. Although it was derived under the assumption that the sorption isotherm is linear, the equation was shown to be in qualitative agreement with the experimental results when the separation took place in a partition column. Consequently we investigated the applicability of this equation for separation on gas-solid adsorption columns containing modified silica, further the optimum characteristics of the adsorbents and the optimal separation conditions. The dependence of the capacity on the separation conditions, theoretically derived by us in an earlier paper [3] has also been studied.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Conclusions 1. m-Bromo-α,β-difluoro-β-chlorostyrene was synthesized and the conditions for the analytical and preparative separation of the cis and trans isomers were determined. They were isolated with a purity of 99.8% as were the isomers of the previously synthesizedα, β- difluoro-β-chlorostyrene. 2. The structure of the isomers was confirmed by NMR, NQR, and IR spectroscopies.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Chromatographia 17 (1983), S. 33-36 
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Preparative scale chromatography ; Capacity ; Dual-step separation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The capacity of dual-step preparative chromatographic separation systems is considered. It is shown that dualstep separation makes it possible to enhance the capacity of preparative installations as compared with single- and dual-stage purification of the compounds.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Chromatographia 15 (1982), S. 765-768 
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Preparative scale chromatography ; Capacity ; Dual-stage separation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The capacity of different versions of single- and dual-stage separation of mixtures on a preparative scale is considered. It has been shown that dual-stage separation with intermediate condensation considerably enhances the capacity of the installation as compared with a single-stage process.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Chromatographia 20 (1985), S. 538-542 
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Fluidized beds ; Industrial chromatography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Chromatography is carried out under the conditions of fluidization, in long, straight tubes under organized and non-organized conditions. Under non-organized conditions the column is filled only with a sorbent. In organized conditions, either metal coils are added into the column or a segmented column is utilized with metal grids. The results obtained are compared to those obtained under fixed-bed conditions when the column is completely filled with the sorbent. Organized fluidized beds provide a significant decrease in longitudinal bandspreading.
    Type of Medium: Electronic Resource
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