Capacity parameter

Vapor Capacity Parameters. The diameter of a distiUation column is determined by the capacity of the column to handle the required flows of vapor and Hquid. The vapor capacity parameter is... 

The term in equation 42 is called a Souders-Brown capacity parameter and is based on the tendency of the upflowing vapor to entrain Hquid with it to the plate above. The term E in equation 43 is called an E-factor. and E to be meaningful the cross-sectional area to which they apply must be specified. The capacity parameter is usually based on the total column cross section minus the area blocked for vapor flow by the downcomer(s). Eor the E-factor, typical operating ranges for sieve plate columns are... 

The absolute pressure may have a significant effect on the vapor—Hquid equiHbrium. Generally, the lower the absolute pressure the more favorable the equiHbrium. This effect has been discussed for the styrene—ethylbenzene system (30). In a given column, increasing the pressure can increase the column capacity by increasing the capacity parameter (see eqs. 42 and 43). Selection of the economic pressure can be faciHtated by guidelines (89) that take into consideration the pressure effects on capacity and relative volatiHty. Low pressures are required for distillation involving heat-sensitive material. 

Entrainment Flooding The early work of Souders and Brown [Ind. Eng. Chem., 26, 98 (1934)] based on a force balance on an average suspended droplet of hquid led to the definition of a capacity parameter C,i, ... 

Maximum allowable values of the capacity parameter are for a flooding condition and are designated C,i,f. Experimental values have been correlated against a dimensionless flow parameter Flg as shown in Fig. 14-25. The flow parameter represents a ratio of liquid to vapor kinetic energies ... 

Figure 14-25 or Eq. (14-92) may be used for sieve plates, valve plates, or bubble-cap plates. The value of the flooding vapor velocity must be considered as approximate, and prudent designs call for approaches to flooding of 75 to 85 percent. The value of the capacity parameter (ordinate term in Fig. 14-25) may be used to calculate the maximum allowable vapor velocity through the net area of the plate ... 

Referring to Fig. 14-48, the intersection of the capacity parameter and the flow parameter lines gives a pressure drop of 0.38 inches H20/ft packing. (The same result is obtained from the Kister/Gill chart. Fig. 14-49.)... 

P decreases as the heat-treatment temperature increases above 2200°C. The parameters which describe the size of the crj stallite, and L, also increase with the heat-treatment temperature. The capacity parameter in Table 1 will be described and carefully discussed later in this chapter. 

Figure 9-63B. Capacity correlation of structured Intalox 2T. The capacity parameter is at the maximum efficient capacity (MEC) point defined by Rukovena and Koshy [151]. The MEC point is iowerthan thefiood point and iocated where the packing wili maintain its desired efficiency. Used by permission of Rukovena, E. and Koshy, T. D., private communication, and Ind. and Eng. Cham. Res. V. 32, No. 10 (1993) p. 2400 all rights reserved.

Flow parameter (Norton Co.) = F = FP Concentration of solute in liquid, lb mol solute/lb mol solute free solvent (or stream) Concentration of solute in liquid, in equiUbri-um -with the gas, lb mol solute/lb mol solvent Concentration of solute in liquid, mole fraction, or mol fraction of more volatile component in liquid phase Curve fit coefficients for C2, Table 9-32 Curve fit coefficients for Cg, Table 9-32 Concentration of solute in liquid in equilibrium -with gas, mol fracdon Concentradon of solute in gas, lb mol solute/lb mol solute free (solvent) (stream) Capacity parameter (Norton)... 

CP Capacity parameter in distillation (m-s-1) or heat capacity flowrate (kW-R, MW-R-1)... 

The calculation is performed in terms of degrees Celsius, including values both above and below zero. It is not convenient, therefore, to use the relative increment of temperature as a test for step size in subroutine CHECKSTEP. I use absolute increments instead. At the end of subroutine SPECS, I set incind equal to 3 for all equations, limiting the absolute increment in temperature to 3° per time step. Zonally averaged heat capacity as a function of latitude is calculated in subroutine CLIMINP in terms of land fraction and the heat capacity parameters specified in SPECS. It is returned in the array heap. 

Combining the flux given by equation (63) with a Michaelis-Menten-like expression for Ju, one recovers the modified Best equation (17), where the bioconversion capacity parameter b is now related to the total concentration of free and labile species of M ... 

Fig. 1. Temperature dependence of the experimental values of the Langmuir capacity parameter So[cf, Eq. (10)] for38) (a) PET-C02 (b) PET-C6H6 (c) PS-C3H8 (d) PC-C02 (e) PMMA, PEMA-C02...

Fig. 2. Correlation of experimental values of the Langmuir capacity parameter (Sq) for C02 at 35 °C with the glass transition temperature of the polymer25) [cf. Eq. (10)]. Pure polymers (PSF = a poly-sulphone 231 COP = a copolyester 26) remaining abbreviations as in the text). Miscible polymer blends O PPO-PS 65> O PC-COP 26>...

CP Capacity parameter (packed F dc Froth height in downcomer mm in... 

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