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  • Functional monomers  (1)
  • Keywords. Sea water; Brine; Crystallization sequence; Simulation.  (1)
  • 2000-2004  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Crystallization Sequence of Brines–Geometrical Principles for a Computer Assisted Calculation (2000)
    Springer
    Monatshefte für Chemie 131 (2000), S. 25-37 
    Details
    ISSN: 1434-4475
    Keywords: Keywords. Sea water; Brine; Crystallization sequence; Simulation.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Die Kristallisationsabfolge beim Abdampfen von Salzsolen wurde bei 25°C aufder Basis der entsprechenden Phasendiagramme computerunterstützt berechnet. Dabei wurden sowohl die auskristallisierenden festen Phasen bestimmt als auch deren Massenbilanzen ermittelt. Um quantitative Information über das Abdampfverhalten von Salzsolen zu erhalten, wurden diesen Berechnungen zwei Grenzannahmen zugrunde gelegt: i) das Fest-flüssig-Gleichgewicht stellt sich laufend ein, sodaß sich feste Phasen während des Verdampfungsprozesses teilweise oder vollständig wieder auflösen können, bzw. ii) die festen Phasen sedimentieren und trennen sich von der flüssigen Phase, sodaß keine Wiederauflösung möglich ist. Tages- bzw. jahreszeitliche Temperaturschwankungen sowie metastabile Gleichgewichte wurden nicht berücksichtigt.
    Notes: Summary.  A computer assisted calculation of the crystallization sequence of a brine is performed on the basis of the respective phase diagrams at 25°C. The nature of the solids and the mass balance are determined. The calculation gives immediate quantitative information of the brine behavior during evaporation. The calculation is performed assuming that i) the solids are always in equilibrium with the liquid, i.e. that some solid phases can be partially or completely redissolved during evaporation, or ii) the solids are separated from liquid by sedimentation and no redissolution is possible. The seasonal or day-night fluctuations of temperature and metastable equilibria have not been taken into account.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00010297
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  • 2
    Electronic Resource
    Electronic Resource
    Radical polymerization and copolymerization behavior of 1-cyanoethanoyl-4-acryloylthiosemicarbzide (2000)
    Springer
    Journal of polymer research 7 (2000), S. 229-235 
    Details
    ISSN: 1572-8935
    Keywords: Functional monomers ; Polymerization ; Copolymerization ; Kinetic studies ; Reactivity ratios
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract 1-Cyanoethanoyl-4-acryloylthiosemicarbazide (CEATS) was synthesized for the first time as a new chelating monomer. Its structure was confirmed by both elemental and spectral analyses. Radical polymerization and copolymerization of CEATS was been carried out in dimethylformamide (DMF) in the presence of azobisisobutyronitrile (AIBN) as an initiator. Kinetic studies for the polymerization behavior of CEATS were performed. The complex formation of the CEATS monomer and polymer (PCEATS) with Cu II cation was investigated and its stability constant determined. The rate of copolymerization of CEATS with some conventional monomers, namely vinyl acetate, methyl methacrylate and acrylonitrile, was measured as a function of the mole fraction of the monomers. The reactivity ratios (r1, r2) for the various copolymer systems investigated together with the Q and e values of the CEATS monomer were determined. Moreover, the thermal gravimetric analysis of the prepared polymers and their copolymers with acrylonitrile were also studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10965-006-0124-x
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