(a)
Interpretation: The suitable operating conditions have to be recommended.
Concept Introduction:
Second order reaction: When the rate of a reaction is proportional to the concentration of two reacting molecules, then such a reaction is known as second order reaction
General representation of a second order reaction is as follows:
Rate law for second order reaction is given below:
(b)
Interpretation: The wrong happenings on choosing the given condition has to be found.
Concept Introduction:
Activity: It is the measure of effective concentration of a chemical species under non-ideal conditions.
(c)
Interpretation: The gas velocity for the given data has to be recommended.
Concept Introduction:
Gas velocity:
The velocity of a gaseous molecule is known as its gas velocity. The average velocity of all gas will be zero in a given sample. This is because gaseous molecules move in all random directions. So the velocity in one particular direction will be cancelled by the velocity of another gas molecule which is acting in the exactly opposite direction.
(d)
Interpretation: The corresponding conversion for the given data with respect to the chosen temperature has to be found.
Concept Introduction:
STTR: Spinning Tube-in-Tube Reactor: It is an area-based reactor system that has applications in petrochemical, biodiesel and pharmaceutical fields.
(e)
Interpretation: The appearance of temperature-time trajectory for the given CSTR has to be found.
Concept Introduction:
CSTR means Continuous stirred-tank reactor. It serves as a common model for a chemical reactor in chemical engineering. It is a mathematical model that works for all types of fluids, liquids, gases and slurries. Prefect mixing of substances can be achieved from this reactor by its action of continuous stirring.
Temperature-time trajectory: In the word temperature-time trajectory, the word trajectory literally means the path. So temperature-time trajectory means the curve that is described by the temperature and time co-ordinates.
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Chapter 10 Solutions
ELEMENTS OF CHEM. REACTION ENGR
- Sensible energy change Calculate the enthalpy change associated with the following processes:(a) m-Cresol is heated from 25°C to 100°C(b) Ethylene glycol is cooled from 20°C to 10°C(c) Succinic acid is heated from 15°C to 120°C(d) Air is cooled from 150°C to 65°Carrow_forward▼ Enzyme conversion An immobilised enzyme process is used in an ice-cream factory to hydrolyse lactose (C12H22O11) to glucose (C6H12O6) and galactose (C6H1206): C12H22O11 + H2O →→ C6H12O + C6H12O6 Gel beads containing ß-galactosidase are packed into a column reactor; 2500 kg of lactose enters the reactor per day as a 10% solution in water at 25°C. The reactor operates at steady state and 32°C; all of the lactose is converted. Because the heat of reaction for enzyme conversions is not as great as for cell culture, sensible heat changes and heats of mixing cannot be ignored. Lactose Water Ah (kJ gmol¹) C, (cal g¹ ºC-¹) Ahm (kcal gmol¹) 3.7 -5652.5 0.30 1.0 Glucose -2805.0 0.30 5.6 Galactose -2805.7 0.30 5.6 (a) What is the standard heat of reaction for this enzyme conversion? (b) Estimate the heating or cooling requirements for this process. State explicitly whether heating or cooling is needed.arrow_forwardBacterial production of alginate Azotobacter vinelandii is investigated for production of alginate from sucrose. In a continuous fermenter at 28°C with ammonia as nitrogen source, the yield of alginate was found to be 4 g g^−1 oxygen consumed. It is planned to produce alginate at a rate of 5 kg h^−1. Since the viscosity of alginate in aqueous solution is considerable, energy input due to mixing the broth cannot be neglected. The fermenter is equipped with a flat-blade disc turbine; at a satisfactory mixing speed and air flow rate, the power requirements are estimated at 1.5 kW. Calculate the cooling requirements.arrow_forward
- Preheating nutrient medium Steam is used to heat nutrient medium in a continuous-flow process. Saturated steam at 150°C enters a coil on the outside of the heating vessel and is completely condensed. Liquid medium enters the vessel at 15°C and leaves at 44°C. Heat losses from the jacket to the surroundings are estimated as 0.22 kW. If the flow rate of medium is 3250 kg h^−1 and its heat capacity is 0.9 cal g^−1 °C^−1, how much steam is required?arrow_forwardQ3] Determine the optimal operating conditions (XA, t, and CR) in a mixed flow reactor to maximize the concentration of R (CR) in the effluent, where an aqueous feed A with an initial concentration of CA0-40 mol/m³ enters the reactor, undergoes decomposition, and exits as a mixture containing A, R, and S. K₁ AR, FR = k₁C, k₁ = 0.4 m³/(mol min) SA AS, rs = k₂CA, k₂ = 2(min), CA0 = 40 mol/m³arrow_forwardConsider the parallel decomposition of A of different orders with FR = 1, rs = 2CA and IT = C. Determine the maximum concentration of desired product obtainable in mixed flow reactor and plug flow reactor. (1) R is desired product and CA0 = 2. (2) S is desired product and CA0 = 4. R S Tarrow_forward
- 1. Copper is known to be toxic to fish, and in particular, the free ion Cu²+ species typically shows greatest toxicity. a. Calculate the speciation of Cu(II) for freshwater at a pH value of 8.3 as the hardness increases from 20 (soft) to 100 (moderately hard) to 200 (very hard) mg/L as CaCO3. Assume that the total divalent Cu(II) concentration is 10 µg/L. b. Based on your findings in part (a), do you think it is appropriate to set a single regulatory limit or should it depend on variables such as pH and hardness? Explain your answer.arrow_forwardMaterial Sciencearrow_forwardElectronic devices found in integrated circuits are composed of very high purity silicon to which has been added small and very controlled concentrations of elements found in Groups IIIA and VA of the periodic table. For Si that has had added 9.1 × 1021 atoms per cubic meter of antimony compute (a) the weight percent and (b) the atom percent of Sb present. (Hint: use Equation 100 C₁ = 1 + NAP2 N1A₁ P2 P1 (a) 0.00636 %wt (b) i 0.0182 %atarrow_forward
- Use the binary diagram, 45 line above and material balance to solve the One thousand kg/h of a (50-50 wt%) acetone-in-water solution is to be extracted at 25C in a continuous, countercurrent system with pure 1,1,2-trichloroethane to obtain a raffinate containing 10 wt% acetone. Using the following equilibrium data, determine with an equilateral-triangle diagram: a the minimum flow rate of solvent; b. the number of stages required for a solvent rate equal to 1.5 times minimum, and composition of each streamleaving each stage. Repeat the calculation of (a) and (b) if the solvent used has purity 93wt% (4wr% acetone, 3wt% water impurities) acetone 0.6 water 0.13 1,1,2-trichloroethane 0.27 Raffinate. Weight Fraction Acetone Extract. Weight Fraction Acetone 0.5 0.04 0.46 0.44 0.56 0.4 0.03 0.57 0.29 0.40 0.3 0.02 0.681 0.12 0.18 0.2 0.015 0.785 0.0 0.0 0.1 0.01 0.89 0.55 0.35 0.1 0.5 0.43 0.07 0.4 0.57 0.03 0.3 0.68 0.02 0.2 0.79 0.01 0.1 0.895 0.005arrow_forwardMaterial Sciencearrow_forwardMaterial Sciencearrow_forward
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