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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Chemistry and technology of fuels and oils 10 (1974), S. 515-518 
    ISSN: 1573-8310
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary 1. Feasibility has been established for complexing n-pentane with urea and the use of this method to extract n-pentane from its mixtures with isopentane. The resulting complex is characterized by weak bonds between components. 2. Optimal conditions have been determined, giving the greatest degree of extraction of n-pentane into the urea complex. 3. The feedstock composition has been shown to influence the degree of extraction of n-pentane into the complex with urea: when the feedstock is richer in isopentane, the degree of n-pentane extraction increases. 4. The method of enriching pentane mixtures in isopentane by successive removal of n-pentane through complexing with urea may be used as the basis for a commercial process to recover isopentane and n-pentane from mixed pentane cuts of naphthas and gas condensates.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1920
    Keywords: Epidermoid cyst ; Conus medullaris ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report a 50-year-old man with an epidermoid cyst of the conus medullaris which showed a nodular gadolinium enhancement on MRI and a blush on angiography. These radiological features are compared with pathological examination.
    Type of Medium: Electronic Resource
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