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  • Chemistry  (2)
  • 1975-1979  (1)
  • 1970-1974  (1)
  • 1945-1949
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  • 1
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 18 (1972), S. 1133-1139 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A method for performing time-optimal control with only limited prior knowledge of specific process dynamics is described. The time constants of the process are identified during the transient period accompanying the desired set point change, and the valve switching times of the control algorithm are calculated based on these time constants. The adaptive features of this method make its use independent of process or operating variation. The effectiveness of the proposed control method was evaluated using digital simulation and experimental techniques. The experimental phase which involved random changes to the temperature set point of a batch reactor was carried out with the aid of an on-line digital computer.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Perfluoromethyl-Element-Ligands. XVIII. Preparation and Spectroscopic Investigation of M(CO)5L and M(CO)4L2 Complexes [L = MenP(CF3)3-n; n = 0-3; M = Cr, Mo, W]M(CO)5L and cis-M(CO)4L2 complexes, respectively [M = Cr, Mo, W; L = MenP(CF3)3-n; n = 0-3] are prepared reacting M(CO)5 · THF or M(CO)4norbor with L at room temperature. The cis-compounds isomerize above 50°C yielding the trans-complexes; the rate of isomerization increases with increasing number of CF3 groups. Thermal reaction of M(CO)6 (M = Cr, Mo, W) with P(CF3)3 yields M(CO)5P(CF3)3 and trans-M(CO)4[P(CF3)3]2. Introduction of three P(CF3)3 ligands by reaction with M(CO)3(cycloheptatriene) (M = Cr, Mo) proves unsuccessful; besides little M(CO)5P(CF3)3 trans-M(CO)4[P(CF3)3]2 is formed. The new compounds are characterized by analytical and spectroscopic (n.m.r., i.r., MS) methods.
    Notes: Die Komplexe M(CO)5L bzw. cis-M(CO)4L2 [M = Cr, Mo, W; L = Men(CF3)3-n; n = 0-3] werden durch Reaktion von M(CO)5 · THF bzw. M(CO)4 norbor mit L bei Raumtemperatur dargestellt. Die cis-Verbindungen wandeln sich oberhalb 50°C in die trans-Komplexe um; die Umwandlungsgeschwindigkeit nimmt mit der Zahl der CF3-Gruppen am Phosphor zu. Die thermische Umsetzung von M(CO)6 (M = Cr, Mo, W) mit P(CF3)3 liefert M(CO)5P(CF3)3 und trans-M(CO)4[P(CF3)3]2. Die Einführung von drei P(CF3)3-Liganden durch Reaktion mit M(CO)5P(CF3)(cycloheptatrien) (M = Cr, Mo) gelingt nicht; es bildet sich trans-M(CO)4[P(CF3)3]2 neben wenig M(CO)5P(CF3)3. Die neuen Verbindungen werden analytisch und spektroskopisch (NMR, IR, MS) charakterisiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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