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  • Chemistry  (76)
  • 2015-2019
  • 2010-2014
  • 1955-1959  (76)
  • 1956  (76)
  • 1
    Electronic Resource
    Electronic Resource
    Quantitative Trennung von Cerit-Erden und pH-Wert des Elutionsmittels beim Ionenaustauscherverfahren (1956)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 68 (1956), S. 411-412 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19560681206
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  • 2
    Electronic Resource
    Electronic Resource
    Stellung des Yttriums bei der Austauschertrennung von Ytter-Erden mit Nitrilotriessigsäure als Elutionsmittel (1956)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 68 (1956), S. 412-412 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19560681208
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  • 3
    Electronic Resource
    Electronic Resource
    Zur quantitativen Trennung geringer Mengen Seltener Erden aus Uran-Spaltprodukten (1956)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 68 (1956), S. 412-412 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19560681207
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  • 4
    Electronic Resource
    Electronic Resource
    The incorporation of aroyloxy radicals in polymer molecules (1956)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 19 (1956), S. 87-92 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Initiation of the bulk polymerization of samples of 2-vinylpyridine with N-nitroso-N-phenyl-m-bromobenzamide and N-nitroso-p-bromoacetanilide gave polymers containing 0.06% and 0.52% bromine, respectively. Therefore, the aroyloxy radical is only about one-eight as reactive as the aryl radical for incorporation in a polymer molecule. This is a rough comparison, for there is no data upon which to base an estimate of the influence of the halogen substituent upon the reactivity of the parent free radicals. The purification of the polymers included an ether extraction of an acid solution of the substances to insure removal of all initiator fragments not attached to the polymer molecules. The presence of aroyloxy radicals in the polymers does not give assurance, however, that they were introduced in the step of chain initiation or even in the original polymerization process. For example, treatment of polystyrene with p-chlorobenzoyl peroxide was found to introduce 0.60% chlorine which through saponification proved to be a minimum of 96% chlorobenzoyloxy groups. Therefore, it seems highly probable that, when nitrosoamides are used as catalysts, aryl radicals may serve exclusively as chain initiators while a much smaller quantity of aroyloxy groups are incorporated by other mechanisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1956.120199109
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  • 5
    Electronic Resource
    Electronic Resource
    Stoffwechselprodukte von Actinomyceten. 4. Mitteilung. Die Foromacidine A, B, C und D (1956)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 39 (1956), S. 304-317 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus dem Kulturfiltrat von zwei Streptomyceten, welche Streptomyces ambofaciens Pinnert-Sindico nahestehen, wurden 4 lipophile, basische Antibiotica - die Foromacidine A, B, C und D - isoliert. Die Foromaeidine A, B und C liefern durch milde saure Hydrolyse Nycarose, einen Dimethylamino-zucker und Forocidin A, B bzw. C. Durch alkalische Hydrolyse wird aus Foromacidin B und Forocidin B 1 Mol Essigsäure, und aus Foromacidin C und Forocidin C 1 Mol Propionsäure abgespalten. Die Zusammensetzung und die analytisch nachgewiesenen funktionellen Gruppen deuten auf eine Verwandtschaft der Foromacidine mit den Antibiotica der Carbomycin-Erythromycin-Gruppe hin. Die Foromacidine zeichnen sich durch bemerkenswerte antibiotische Wirksamkeit in vitro und in vivo aus und besitzen eine geringe Toxizität.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19560390133
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  • 6
    Electronic Resource
    Electronic Resource
    Liquid-metal extraction for processing of spent fuel (1956)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 2 (1956), S. 169-173 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Plutonium and the fission products can be removed from irradiated uranium by liquidmetal extraction by use of another metal immiscible with uranium. Metals studied have been silver, cerium, and lanthanum. Plutonium removal by silver is high, by the rare-earth metals moderate. In all cases volatile elements, including cesium, strontium, and barium, are removed. Rare earths are efficiently removed. Ruthenium and molybdenum are largely unaffected. Experiments with synthetic fuels corresponding to long burn-up periods show improved removal of most elements. Repeated batch extractions indicate that a continuous process separating the fuel into uranium, plutonium, and fission-product fractions could be developed.
    Additional Material: 9 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690020208
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  • 7
    Electronic Resource
    Electronic Resource
    Fractionation during condensation of vapor mixtures (1956)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 2 (1956), S. 363-371 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Partial condensers of the reflux type are capable of producing substantial fractionation of vapor mixtures. For vapor products having low dew points they may be preferred to conventional equipment for adiabatic distillation plus total condensation.Experimental studies of a condenser used to fractionate mixtures of ethylene dichloride and toluene show that observed mass transfer effects are in agreement with the Colburn-Drew film theory, which accounts for the influence of the net mass exchange on the relative mass transfer rates of the components. In an adaptation of the transfer-unit concept to partial condensation, new equations are derived relating the number of transfer units to liquid- and gas-phase resistances, surface area, and amount of condensation. Observed resistances to mass transfer agree qualitatively with values independently measured; the diffusional resistance of the liquid phase has a pronounced effect on the fractionation, which does not conform to the Rayleigh theory of equilibrium differential condensation.Partial condensers appear, to require more interracial area than adiabatic distillation equipment in order to produce the same fractionation at the same heat load; for the same interfacial area condensers require more heat removal.Although only the system ethylene dichloride-toluene was investigated here, the results of this work are believed pertinent binary liquid mixtures also. Knowledge of the vapor-liquid equilibrium relationship of the new system and of the liquid and vapor-phase transfer coefficients is required in order to employ the calculation methods introduced here.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690020314
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  • 8
    Electronic Resource
    Electronic Resource
    Interpretation and correlation of ion exchange column performance under nonlinear equilibria (1956)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 2 (1956), S. 404-411 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Various methods are known for interpreting experimental data for linear-equilibrium cases or constant-pattern break-through curves where either external or internal diffusion alone controls the rate in the ion exchange column. The present paper provides interpretive techniques for nonlinear equilibrium cases where the rate is controlled by a combined diffusion mechanism. The techniques can be applied whether or not the value of the equilibrium constant is known.A completely general correlational method is derived for adding the mass transfer resistances under conditions of nonlinear equilibrium. Published break-through results from numerous sources and from new measurements, evaluated by the techniques described, are used to determine the numerical constants for the general correlation.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690020321
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  • 9
    Electronic Resource
    Electronic Resource
    Pressure drop through porous mediaParts I through IV of this article appeared in the Transactions of the American Institute of Chemical Engineers and Chemical Engineering Progress (1 to 4). (1956)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 2 (1956), S. 79-81 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Fluid flow data are presnted for beds of uniformly sized spheres consolidated with resin over a porosity range from 36.4 to 12.3%. The data are analyzed in terms of an effective pore volume and equations are given for predicting pressure drop by use of a friction-factor-Reynolds-number plot.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690020117
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  • 10
    Electronic Resource
    Electronic Resource
    Continuous dissolution of uranium-aluminum reactor fuels (1956)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 2 (1956), S. 190-194 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Extensive pilot plant studies of the continuous, mercury-catalyzed nitric acid dissolution of uranium-aluminum alloy materials similar to possible reactor fuel elements were carried out. Marked differences were observed in the dissolution rates of cast and wrought alloys. Optimum feed-acid concentrations varied with the type of alloy. At constant acid feed conditions dissolving rates varied approximately with the cube root of catalyst concentration up to a limiting concentration. The metal dissolving rate was proportional to the 0.8 power of the nitric acid feed rate. A general empirical correlation was developed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690020212
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