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Bioprocess Engineering

Bioprocess Engineering

Michael L… 2nd Edition
Achievement 1,623 solutions

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The growth of baker's yeast $(S$. cerevisiae) on glucose may be simply described by the following equation: $$ \mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}+3 \mathrm{O}_{2}+0.48 \mathrm{NH}_{3} \underset{\text { yeast }}{\longrightarrow} \underset{10}{\longrightarrow} \mathrm{NO}_{3}+4.32 \mathrm{H}_{2} \mathrm{O}+3.12 \mathrm{CO}_{2} $$ In a batch reactor of volume $10^{5} 1$, the final desired yeast concentration is $50 \mathrm{gdw} / 1 .$ Using the above reaction stoichiometry: a. Determine the concentration and total amount of glucose and $\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4}$ in the nutrient medium. b. Determine the yield coefficients $Y_{X / S}$ (biomass/glucose) and $Y_{X / O_{2}}$ (biomass/oxygen). c. Determine the total amount of oxygen required. d. If the rate of growth at exponential phase is $r_{x}=0.7 \mathrm{gdw} / 1-\mathrm{h}$, determine the rate of oxygen consumption (g $\left.\mathrm{O}_{2} / \mathrm{l}-\mathrm{h}\right)$. e. Calculate the heat-removal requirements for the reactor (recall eq. $6.26$ ).

Bioprocess Engineering

One thousand workers insured under a workers compensation policy were observed for one year. The number of work days missed is given below: $$ \begin{array}{lc} \hline \text { Number of days missed } & \text { Number of workers } \\ \hline 0 & 818 \\ 1 & 153 \\ 2 & 25 \\ \geq 3 & 4 \\ \hline \end{array} $$ The total number of days missed is 230 and a Poisson distribution is fitted, with the parameter estimated by the average number of days missed. Determine the results of the chi-square goodness-of-fit test for the model.

Nonlife Actuarial Models: Theory, Methods and Evaluation (International Series on Actuarial Science)

EBIT and Leverage Money, Inc., has no debt outstanding and a total market value of $\$ 275,000$. Earnings before interest and taxes, EBIT, are projected to be $\$ 21,000$ if economic conditions are normal. If there is strong expansion in the economy, then EBIT will be 25 percent higher. If there is a recession, then EBIT will be 40 percent lower. Money is considering a $\$ 99,000$ debt issue with an interest rate of 8 percent. The proceeds will be used to repurchase shares of stock. There are currently 5,000 shares outstanding. Ignore taxes for this problem. a. Calculate earnings per share, EPS, under each of the three economic scenarios before any debt is issued. Also calculate the percentage changes in EPS when the economy expands or enters a recession. b. Repeat part (a) assuming that Money goes through with recapitalization. What do you observe?

Corporate Finance

Let $S_{4}:=\left\{1-(-1)^{n} / n: n \in \mathbb{N}\right\} .$ Find inf $S_{4}$ and sup $S_{4}$.

Introduction to Real Analysis

The Real Numbers

The Completeness Property of…

Questions asked

INSTANT ANSWER

2.4-9. Throughput of a Single-Effect Evaporator. An evaporator is concentrating \( F \mathrm{~kg} / \mathrm{h} \) at \( 311 \mathrm{~K} \) of a \( 20 \mathrm{wt} \% \) solution of \( \mathrm{NaOH} \) to \( 50 \% \). The saturated steam used for heating is at \( 399.3 \mathrm{~K} \). The pressure in the vapor space of the evaporator is \( 13.3 \mathrm{kPa} \) abs. The overall coefficient is \( 1420 \mathrm{~W} / \mathrm{m}^{2} \cdot \mathrm{K} \) and the area is \( 86.4 \mathrm{~m}^{2} \). Calculate the feed rate \( F \) of the evaporator. Ans. \( F=9072 \mathrm{~kg} / \mathrm{h} \) :2.4-10. Surface Area and Steam Consumption of an Evaporator. A single-effect evaporator is concentrating a feed solution of organic colloids from 5 to \( 50 \mathrm{wt} \% \). The solution has a negligible boilingpoint elevation. The heat capacity of the feed is \( c_{p}=4.06 \mathrm{~kJ} / \mathrm{kg} \cdot \mathrm{K} \) \( \left(0.97 \mathrm{btu} / \mathrm{lb}_{\mathrm{m}} \cdot{ }^{\circ} \mathrm{F}\right) \) and the feed enters at \( 15.6^{\circ} \mathrm{C}\left(60^{\circ} \mathrm{F}\right) \). Saturated steam at \( 101.32 \mathrm{kPa} \) is available for heating, and the pressure in the vapor space of the evaporator is \( 15.3 \mathrm{kPa} \). A total of \( 4536 \mathrm{~kg} / \mathrm{h}(10 \) \( 000 \mathrm{lb} \mathrm{m} / \mathrm{h} \) ) of water is to be evaporated. The overall heat-transfer coefficient is \( 1988 \mathrm{~W} / \mathrm{m}^{2} \cdot \mathrm{K}\left(350 \mathrm{btu} / \mathrm{h} \cdot{ }^{\circ} \mathrm{F}\right) \). What is the required surface area in \( \mathrm{m}^{2} \) and the steam consumption?

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