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  • 1
    Electronic Resource
    Electronic Resource
    Physical properties of hydrogen sulfide-water mixtures (1969)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 15 (1969), S. 272-275 
    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: Calculations concerning the production of heavy water by the hydrogen sulfide dual-temperature exchange process require precise data on the physical properties of dry hydrogen sulfide and hydrogen sulfide-water mixtures for temperatures between 25 and 170°C., and for pressures between 200 and 340 lb./sq.in.abs. However, data on enthalpy of hydrogen sulfide-water mixtures were not found in the literature, and data published on hydrogen sulfide-water compositions at equilibrium were given at such large intervals of temperature and pressure that they could not be interpolated accurately enough by ordinary means. 1Specific volume and enthalpy of dry, superheated hydrogen sulfide vapor,2Composition of hydrogen sulfide-water vapor and liquid in equilibrium,3Enthalpy of hydrogen sulfide vapor saturated with water vapor,4Enthalpy of water liquid saturated with hydrogen sulfide vapor,5Deuterium distribution constants for vapor-liquid equilibrium.A study was undertaken to express the properties, listed below, with equations suitable for solution on a digital computer and useful in mathematical models of the process.New correlating constants were derived where needed. The equations and typical results are presented in this paper.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690150227
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  • 2
    Electronic Resource
    Electronic Resource
    Predator-prey relationships in a model for the activated process (1969)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 11 (1969), S. 887-907 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The primary objective of this paper was to develop a mathematical description for the food chain, Because of the interdependence of the elements in this food chain, continuous oscillations among the variables are possible. A set of three differential equations was obtained to describe the above system in a continuously fed stirred tank reactor. The differential equations obtained were examined to characterize the possible types of solutions. A limit, cycle solution was obtained for some values of the system parameters.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260110514
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis of aromatic polycarbonates by an anhydrous catalytic solution process. I. The phosgene-phenol interaction (1965)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 9 (1965), S. 3295-3307 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A two-step, catalytic, anhydrous solution process was developed for the preparation of the polycarbonate of 2,2-bis(p-hydroxyphenyl)propane (bisphenol-A). It involves the preparation of the dichloroformate of bisphenol-A followed by its condensation with bisphenol-A in the presence of magnesium metal. Attempts were also made to develop a one-step, catalytic solution process. The reaction of bisphenol-A with phosgene, in the presence of aluminum chloride, a very powerful catalyst, led to polymers with reduced viscosities as high as 0.35. Higher viscosities were not obtained due to the lack of a suitable, nonreactive solvent.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1965.070091009
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis of aromatic polycarbonates by an anhydrous catalytic solution process. II. The chloroformate-chloroformate interaction (1965)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 9 (1965), S. 3309-3319 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Several classes of compounds promote the anhydrous condensation of phenyl chloroformate with itself to give diphenyl carbonate and phosgene (or its elements). The compounds in question act either as true catalysts (recoverable unchanged) or as reagents. Salts of magnesium and zinc, particularly the chlorides, belong to the catalytic class. Useful reagents included metal oxides (magnesium, zinc, and calcium) and alkali and alkaline earth metal carbonates, sulfites, bicarbonates, and bisulfites. High molecular weight aromatic polycarbonates were obtained by analogous reactions starting with difunctional chloroformates. Self-condensation of bisphenol-A dichloroformate in the presence of magnesium chloride afforded the polycarbonate with a reduced viscosity 0.2. The use of magnesium oxide allowed the preparation of polycarbonates having reduced viscosities in the useful plastic range (0.45 and higher).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1965.070091010
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