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Simple stage

Select the boundaries to sub-divide the process into simple stages and make a balance over each stage separately. [Pg.37]

In addition, this first simple stage can act as a starting point for more advanced models which consider transfer and transformation processes in a more comprehensive manner. It provides a focal point for sorting out key information regarding a chemicals fate in the environment, and acts as good first approximation of behavior upon which to base further research. [Pg.121]

Production of phenol and acetone is based on liquid-phase oxidation of isopropylbenzene. Synthetic fatty acids and fatty alcohols for producing surfactants, terephthalic, adipic, and acetic acids used in producing synthetic and artificial fibers, a variety of solvents for the petroleum and coatings industries—these and other important products are obtained by liquid-phase oxidation of organic compounds. Oxidation processes comprise many parallel and sequential macroscopic and unit (or very simple) stages. The active centers in oxidative chain reactions are various free radicals, differing in structure and in reactivity, so that the nomenclature of these labile particles is constantly changing as oxidation processes are clarified by the appearance in the reaction zone of products which are also involved in the complex mechanism of these chemical conversions. [Pg.14]

If the change took place in the one simple stage 2 C120 = 2 Cl2 + 02 the increase in pressure at any time would be a direct measure of the extent to which the reaction had progressed. When the pressure increase is plotted against time the curve shows that the reaction apparently accelerates as it proceeds, as though the chlorine or the oxygen... [Pg.64]

The overall equation of scheme (34) is obtained from the overall equation of scheme (33) when it is multiplied by 1/2. The possibility of multiplying overall equations by arbitrary numbers is shown by the use of the equality sign. Such an operation is not permissible for the equations of simple stages e.g., the equation... [Pg.190]

Let us denote the rate of the sth stage as r s if this is a simple stage, then... [Pg.194]

The techniques employed in qualitative analysis vary in their complexity, depending on the nature of the sample under investigation. In some cases it is only necessary to confirm the presence of certain elements or groups for which specific chemical tests, or spot tests, applicable directly to the sample, may be available. More often, the sample is a complex mixture, and a systematic analysis must be made in order that all the component parts may be identified. Often, the first simple stages of qualitative analysis require no apparatus at all. Things like colour and smell can be observed without any need for apparatus. [Pg.272]

Simple stage An equilibrium stage that contains no feeds, side products, or heat exchangers (top condenser/receiver, bottom reboiler, interreboiler, or intercondenser). [Pg.137]

The simple stage model. The ideal or equilibrium stage was defined and discussed earlier (Sec. 2,1). The material and energy flows in and out of a simple stage, with no feeds or side products, is depicted in Fig. [Pg.137]

Figure 4.1 Stage and column models, (a) Overall column model (6) simple stage model... Figure 4.1 Stage and column models, (a) Overall column model (6) simple stage model...
The component balance for the simple stage (no feed or side product), /. of Fig. 4.16, is... [Pg.141]

The enthalpy terms, H and h, are per mole of mixture. Note that the enthalpies of the top and side products are written so that a vapor or liquid enthalpy can be substituted, depending on the phase of the product. The energy balance for the simple stage of Fig. 4.16 is... [Pg.142]

The final subblock of the Heat Capacity Data Bank involves programs for needed calculations in the thermal analysis field. The simple stages involve data treatment for input and output, calculation of derived functions as given, for example, in egs. 1 to 3-Further stages include the data analysis in form of Debye and Tarasov 0-temperatures and group vibration frequencies, a stage already completed (VI). Self-... [Pg.362]

This review does not cover multiple eliminations at the same (cf.156)) or at different centres proceeding without rearrangement and which, [for e.g., the Ramberg-Backlund- 2) or the benzotriazinone-arylazide-reaction 3) (Scheme 2)], can be classified in simple stages ([l,3]-e. and [l,2]-e., or [l,4]-e., valence tautomerism, [l,l]-e., intramolecular nitrene cycloaddition, respectively). [Pg.62]

The solid-state NMR method described in this article is still useful in the determination of the local structure in oriented synthetic polymers as well as protein fibers. In this section, bond orientation will be treated first, as a more simple stage in the structural determination on the basis of chemical shielding. Namely, the NH bond orientation relative to the oriented axis can be calculated from the N chemical shielding when the oriented axis is set parallel... [Pg.320]

In this form it can be seen that a is greater than a, and becomes much greater as B approaches unity. Thus, differential stage separation may be used to enhance the difference in composition attainable in simple stage separation. [Pg.651]

The seal drums provide protection against flashback into the blowdown lines. They also make it possible to set up a simple staging system for the burners. [Pg.176]

A first very simple stage is the extension of the frequency formula to an atom in which the nucleus has a charge of Ze units (as may be assumed for an element of atomic number Z) but which contains a single electron only—that is to say, an atom which has lost all its electrons save this one. The frequencies are obviously given by... [Pg.171]

Several authors have considered different absorption machine configurations. Some systems are composed with simple stage machine [10-15] and others are formed by a succession of stages with various component associations and sometimes inserting other new components [16-20], In the following section, we present three different configurations... [Pg.120]

In each of the following reactions, more than a simple addition takes place. Keep your wits about you, think in simple stages, and work out mechanisms. [Pg.407]


See other pages where Simple stage is mentioned: [Pg.382]    [Pg.71]    [Pg.189]    [Pg.193]    [Pg.195]    [Pg.204]    [Pg.233]    [Pg.251]    [Pg.394]    [Pg.394]    [Pg.200]    [Pg.53]    [Pg.117]    [Pg.34]    [Pg.410]    [Pg.78]    [Pg.142]    [Pg.64]    [Pg.430]    [Pg.261]   
See also in sourсe #XX -- [ Pg.137 , Pg.138 , Pg.141 ]

See also in sourсe #XX -- [ Pg.137 , Pg.138 , Pg.141 ]




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