Molar feeding rate

Basic Principles of Operation Gas-separation literature often uses nomenclature derived from distillation, a practice that will generally be followed here. L is the molar feed rate, V is the molar permeate rate, R is the molar residue (L — V). Mole fractions of components i, j, in the feed-residue phase will be Xj, Xj. .. and in the permeate phase yi,yj.... Stage cut, 0, is permeate volume/feed volume, or V/L. 

Set the molar feed rate of inerts to a high value, and note that G does not change much with position. 

Because of the small change in moles on reaction, and the dilution with N2(inert), together with an anticipated (but not calculated) relatively small (-AZ ), the assumption of constant density is a reasonable one. It can be calculated that for every mole of A entering, the total moles entering is 10.57 and the total leaving is 10.92, an increase of only 3.3%. The actual molar feed rates of A (FAo) and total gas (Fto) are ... 

Using Simpson s rule, the value of /o /dxA is 23.5s. At HOOK, the given molar feed rate of 0.25molAs together with the inert diluent, corresponds to a total volumetric feed rate of 0.564 m s . Thus... 

As shown in Fig. 5.3, if AO UqCao is the molar feed rate of component A to the reactor, then considering the reactor as a whole we have... 

Molar feed rates and industrial reactor data... 

By convention in this chapter, the reactant A will be initially charged into the reactor, whereas B will be added with a constant molar feed rate FE during the... 

Figure 9 shows the steady state convergent results for reducing the exit gas pressure from 2.84 MPa (28 atm) to 2.53 MPa (25 atm). The pressure decrease lowers the gas density but increases the gas velocity since the molar feed rate of the inlet gas remains constant. This puts less heat into the reactor which lowers the exit gas temperature and causes the burning zone to shift down the reactor a short distance. This is reflected in the Figure 9 solids temperature response which starts out with a short false temperature rise but then exhibits a rapid temperature drop to a final steady state condition (non-minimum phase response). 

The irreversible reaction 2A—>B takes place in the gas phase in a constant temperature plug flow reactor. Reactant A and diluent gas are fed in equimolar ratio, and the conversion of A is 85 percent. If the molar feed rate of A is doubled, what is the conversion of A assuming the feed rate of diluent is... 

Experiments and calculations have shown that the CO exchange process over Ni at 220°C is immeasurably rapid so that the fraction of labeled CO in the surface phase is the same as that in the gas phase (i 7). The response curves can be calculated by using Eq. (4) with j representing one of the isotopes, aU the r/s equal to zero, and t o N/R, where N is the total moles of both kinds of CO in both phases and R is the molar feed rate of the appropriate isotope. Since we know R, tqo, aitd the gas volume, we can calculate the surface coverage of CO from this experiment. The response time Tco is measured for this first-order mixing process, but no... 

The net outflow Wi2 — Wi can be written as where F is the total molar feed rate and is a corresponding extent of production of species i in moles per mole of feed. Then Eq. (3.1-19) becomes... 

Next calculate the molar feed rate of ethane. To produce 0.34 lb mol/.s of ethylene when 80% conversion is achieved. 

Reforming reactors are used to increase the octane number of petroleum, In a reforming process 20,000 barrels of petroleum are to be processed per day. The corresponding mass and molar feed rates are 44 kg/s and 440 mol/s, respectively. In the reformer, dehydrogenation reactions such as... 

In Example 4-11, plot the time at which maximum rate of reaction occurs (e.g., in the example the maximum rate is 0.00017 mol/dm -s at r = 25 s) as a function of the entering molar feed rate of B. What if you were asked to obtain the maximum concentration of C and D in Example 4-11 What would you do ... 

How might you increase the conversion and decrease the time of operation For example, what conversion would be achieved if a second 1000-ga CSTR were placed either in series or in parallel with the CSTR For the same temperature and feed conditions as part (a), what CSTR volume would be necessary to achieve a conversion of 85% for a molar feed rate of A of 1 lb mol/min ... 

P4-18b Ethyl acettde is an extensively used solvent and can be formed by the vapor-phase esterification of acetic acid and ethanol. The reaction was studied using a microporous resin as a catalyst in packed-bed reactor [Ind. Eng. Chetn. Res., 26(2), 19S(I987)]. The reaction is first-order in ethanol and pseudo-zero-order in acetic acid. Fw tm equal molar feed rate of acetic acid and ethanol the sped fic reaction rate is 1.2 dm /g cat 10111. The total molar feed rate is 10 mol/min, the initial pressure is 10 atm, the temperature is U8°C, and the pressure drop parameter, a, equals O.Ol g K... 

The molar feed rate of A to (he system minus the rate of reactioii of A within the system equals the molar flow rate of A leaving the system F. The preceding sentence can be written in the form of the following mathematical statement ... 

Total Molar Feed Rate to Reactor (g mol/h) Partial Pressure (atm) in Feed Mole Fraction CH4 in Exit Stream... 

What conversion could Im achieved in Example 8-8 if two interstage coolers were available that had the capacity to cool the exit stream to 350°K. Also determine the heat duty of each exchanger for a molar feed rate of A of 40 mol/s. Assume that 95% of equilibrium conversion is achieved in each reactor. The feed temperature to the first reactor is 300 K ... 

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