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** Chemical reaction rate coefficients **

Room temperature rate coefficient for the reaction between CH3O2 and NO3, in G. Restelli, G. Angeletti (eds). Fifth European Symp. on Physico-Chemical Behaviour of Atmospheric Pollutants, Kluwer Academic PubL, Dordrecht 1990, pp. 371-376. [Pg.263]

Let us consider state dependent rate coefficients for chemical reactions appearing in Eqs. (59)-(61). In the zero-order Chapman-Enskog approximation rate coefficients for [Pg.126]

Lee, S., Leone, S.R. (2000) Rate Coefficients for the Reaction of C2H with O2 at 90 K and 120 K Using a Pulsed Laval Nozzle Apparatus. Chem. Phys. Lett. 329 443-449. de Nalda, R., Banares, L. (eds) (2013) Ultrafast Phenomena in Molecular Sciences Femtosecond Physics and Chemistry (Springer Series in Chemical Physics). Springer, Berlin. [Pg.128]

Fontyn et measured the spectral distribution of the reaction over the wavelength region 3875-14,000 A. The absolute rate coefficient for the reaction was determined by chemical actinometry the value obtained was 3.84 x 10 l.moIe .sec , within an accuracy of 30 %. The reaction was studied in a flow microwave discharge system and O atoms were produced from molecular oxygen. [Pg.185]

The Treanor effect (3-165) can be applied for isotope separation in plasma (Belenov et al., 1973). The ratio of rate coefficients of chemical reactions for two different vibrationally excited isotopes (v = V ), called the coefficient of selectivity, can be expressed as [Pg.125]

Equation 37 expresses the combined chemical and mass transfer rate equations [35] in terms of the gas phase concentration, C, the combustion rate, m, expressed as kgC/m s of external surface area of particle. R is the chemical rate coefficient for the reaction of order n, and X is the fractional approach to mass transfer control. X lies between 0 and 1. External mass transfer control is inferred when X has a value approaching 1. [Pg.185]

With a reactive solvent, the mass transfer coefficient may be enhanced by a factor E so that, for instance Kg is replaced by EKg. Like specific rates of ordinary chemical reactions, such enhancements must be found experimentally, although some theoretical relations for idealized situations have been found. Tables 8.1 and 8.2 show a few spot data. A particular [Pg.812]

With a reactive solvent, the mass-transfer coefficient may be enhanced by a factor E so that, for instance. Kg is replaced by EKg. Like specific rates of ordinary chemical reactions, such enhancements must be found experimentally. There are no generalized correlations. Some calculations have been made for idealized situations, such as complete reaction in the liquid film. Tables 23-6 and 23-7 show a few spot data. On that basis, a tower for absorption of SO9 with NaOH is smaller than that with pure water by a factor of roughly 0.317/7.0 = 0.045. Table 23-8 lists the main factors that are needed for mathematical representation of KgO in a typical case of the absorption of CO9 by aqueous mouethauolamiue. Figure 23-27 shows some of the complex behaviors of equilibria and mass-transfer coefficients for the absorption of CO9 in solutions of potassium carbonate. Other than Henry s law, p = HC, which holds for some fairly dilute solutions, there is no general form of equilibrium relation. A typically complex equation is that for CO9 in contact with sodium carbonate solutions (Harte, Baker, and Purcell, Ind. Eng. Chem., 25, 528 [1933]), which is [Pg.2106]

The E/N parameter has been used by many workers (16, 17, 34, 35, 41, 50, 57) to compare measurements of the rate coefficients for the ionization of atoms and molecules by electron impact. However, only a few attempts have been made to obtain the data necessary to correlate experimental rate coefficients for chemical reactions such as molecular dissociation (29, 36, 37). Correlations of this kind are essential to the understanding of and prediction of the rates of chemical reactions in electrical discharges under various experimental conditions. [Pg.26]

The variation of efficiencies is due to interaction phenomena caused by the simultaneous diffusional transport of several components. From a fundamental point of view one should therefore take these interaction phenomena explicitly into account in the description of the elementary processes (i.e. mass and heat transfer with chemical reaction). In literature this approach has been used within the non-equilibrium stage model (Sivasubramanian and Boston, 1990). Sawistowski (1983) and Sawistowski and Pilavakis (1979) have developed a model describing reactive distillation in a packed column. Their model incorporates a simple representation of the prevailing mass and heat transfer processes supplemented with a rate equation for chemical reaction, allowing chemical enhancement of mass transfer. They assumed elementary reaction kinetics, equal binary diffusion coefficients and equal molar latent heat of evaporation for each component. [Pg.2]

** Chemical reaction rate coefficients **

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