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Miguel Samuel

Miguel S.

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Books Assigned

The Engineering of Chemical Reactions

The Engineering of Chemical…

Lanny D.… 1st Edition
Achievement 1,497 solutions

Viewed Questions

Derive an expression for the effectiveness factor of a porous catalyst slab of thickness $2 L$ that has an effective pore diameter $d_{\mathrm{e}}=4 \varepsilon / \rho_{\mathrm{c}} S$ with a first-order reaction $r^{\prime \prime}=k^{\prime \prime} C_A$. Can you justify $d_c=4 \varepsilon \rho_c S$ ?

The Engineering of Chemical Reactions

Find $X_A, S_B, Y_B$, and $F_B$ in a PFTR and in a CSTR for the reactions $$ \begin{array}{ll} A \rightarrow B, & r_1=k_1 C_{A^2} \\ A \rightarrow C, & r_2=k_2 C_A \end{array} $$ with $k_1=2$ liter $\mathrm{mole}^{-1} \mathrm{~min}^{-1}, k_2=1 \mathrm{~min}^{-1}, \mathrm{v}=20$ liters $/ \mathrm{min}, V=100$ liters, and $C_{A \mathrm{o}}=4$ moles/liter.

Find $X_A, S_B, Y_B$, and $F_B$ in a PFTR and in a CSTR for the reactions $$ \begin{array}{ll} A \rightarrow B, & r_1=k_1 C_{A^2} \\ A \rightarrow C, & r_2=k_2 C_A \end{array} $$ with $k_1=2$ liter $\mathrm{mole}^{-1} \mathrm{~min}^{-1}, k_2=1 \mathrm{~min}^{-1}, \mathrm{v}=20$ liters $/ \mathrm{min}, V=100$ liters, and $C_{A \mathrm{o}}=4$ moles/liter.

The Engineering of Chemical Reactions

An aqueous feed containing reactant A ( 1 mole/liter) enters a 2 liter plug-flow reactor and reacts with the reaction $2 A \rightarrow B, r$ (mole/liter min) $=0.2 C_A$. (a) What feed rate (liter/min) will give an outlet concentration of $C_A=0.1$ mole/liter? (b) Find the outlet concentration of $A$ (mole/liter) for a feed rate of 0.1 liter/min. (c) Repeat this problem for a stirred reactor.

The Engineering of Chemical Reactions

In a pond the frogs reproduce by natural methods and are eaten by bass, who die of natural causes. (a) Formulate expressions for $C_{\mathrm{F}}$ and $C_{\mathrm{B}}$. (b) How should these equations be modified to account for fishermen who do not practice catch-and-release?

The Engineering of Chemical Reactions

Questions asked

INSTANT ANSWER

The catalytic reaction W → Z is performed in a reactor that has cylindrical pellet catalyst particles of 10 m in diameter and 15 m in height in it. The density of the catalyst is 3.12 g/cm3 and surface area of the catalyst is 955 m2/g. The void fraction in the reactor is 0.450. The surface rate of reaction constant was found to be 2.081x10-12 L/(cm2 sec). The high porosity of the catalyst limits the rate of reaction to 78.9% of the ideal case. The feed into the 235 L reactor is 80.5 L/min of 0.962 M W.

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ANSWERED

Shu Naito verified

Numerade educator

The gaseous reaction O ↔ P + U occurs in a batch reactor at 722 MPa and 390˚C. At this temperature, the equilibrium constant is 6.15. What is the maximum conversion you can obtain if you start with equal molar ratio of O and inert in the reactor?

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INSTANT ANSWER

We need to calculate the concentration of a pollutant A following a spill into a river which flows by our chemical plant at 10^5 gal/h at 5 mph. There is a waterfall just upstream, so the water is saturated with air at CO2 = 1.5 × 10^-3 moles/liter. The river bottom is rocky so that the flow is well mixed radially. This chemical is oxidized by dissolved O2 with a rate r = kCACO2 with k= 2000 liters/mole h and r in moles/liter h. (a) Consider a steady leak of 10 gal/h at CA = 0.1 moles/liter. What is CAo in the river after mixing? (b) If trout are killed if CA > 10^-6 moles/liter, estimate the downstream distance at which the trout be killed. [You don’t need to solve a second-order equation.] (c) Suppose that the leak is 100 gal/h of 10 molar A. What is CAo in the river after mixing? (d) If carp are not harmed by A but they die if CO2 < 10^-4 moles/liter, estimate the downstream distance at which the carp be killed for the spill in part (c), assuming no replenishment of the O2. [Again, you do not need to solve a second-order equation.]

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