Chapter 9, Problem 9.8E

How will you select a suitable condensate technique

A biofilm consists of living cells immobilized in a gelatinous matrix. A toxic organic solute (species A) diffuses into the biofilm and is degraded to harmless products by the cells within the biofilm. We want to treat 0.2 m3 per hour of wastewater containing 0.14 mole/m of the toxic substance phenol using a system consisting of biofilms on rotating disk as shown below.  thickness of the biofilm is 1 mm and we are interested to reduce the phenol concentration in the outlet stream to 0.025 mole/m3. The rate of disappearance of phenol (species A) within the biofilm is described by the following equation rA = - KICA Where k1 = 0.0024 s-1 The diffusivity of phenol in the biofilm at the process temperature of 25°C is 2.0x10 10 m2/s. Phenol is equally soluble in both water and the biofilm. 1. The concentration of A in the biofilm is give by Ca = Bisinh(mz) + Bzcosh(mz), the numerical value of m is. 2. Use m = 3 mm^-1, determine the numerical values with units for B1 and B2 with the unit of…

use the integral method if you can, thank you!

2. A single-effect evaporator is concentrating a feed solution of organic colloids from 5 to 50 wt %. The solution has a negligible boiling point elevation. The heat capacity of the feed is cp . 4.06 kJ/kg K and the feed enters at 15.6 °C. Saturated steam at 101.32 kPa is available for heating, and the pressure in the vapor space of the evaporator is 15.3 kPa. A total of 4536 kg/h of water is to be evaporated. The overall heat-transfer coefficient is 1988 W/m². K. What is the required surface area in m² and the steam consumption?

A mixture with 4% n-pentane, 40% n-hexane, 50% n-heptane, and 6% n-octane is to be distilled at 14.7 lb/in² (1 atm.) with 98% of the hexane and 1% of the heptane recovered in the distillate. If the liquid feed is a saturated liquid (i.e., q = 1). Calculate i.) The product compositions, ii.) The top and bottom temperature iii.) Minimum reflux ratio (Rm), iv.) Minimum theoretical plates and v.) Actual plates when the reflux ratio is 2Rm. Table 1: Component boiling point and molar mass Component Boiling point n-C5 97°F n-C6 156.2°F n-C7 209.1°F n-C8 258.1°F Molar mass 72.2 86.2 100.2 114.2 Hint: Since 1% of heptane is specified to be recovered in the distillate, 99% of heptane is to be recovered in the bottom.

H.W 1. A plant wishes to dry a certain type of fiberboard. To determine drying characteristics, a sample of 0.3 × 0.3 m with edges sealed was suspended from a balance and exposed to a current of hot dry air. The initial moisture content was 75%. The sheet lost weight at the rate of 1 104 Kg/s unit the moisture content fell to 60%. It was established that the equilibrium moisture content was 10 %. The dry mass of the sample was 0.90 Kg. All moisture contents were on a wet basis. Determine the time for drying the sheets from 75% to 20% moisture under the same drying conditions?

2.) A mixture with 4% n-pentane, 40% n-hexane, 50% n-heptane, and 6% n-octane is to be distilled at 14.7 lb/in² with 98% of the hexane and 1% of the heptane recovered in the distillate. If the feed is a saturated liquid (q = 1), the top and bottom temperature are 149°F and 212°F respectively, calculate i.) The product compositions, ii.) Minimum reflux ratio (Rm), iii.) Minimum theoretical plates and iv.) Actual plate when the reflux ratio is 2Rm.

answer choices 3. A. 0.18, B. 0.44, C. 0.01, D. 2 4. A. 0.2, B. 01, C. 0.4, D. 0.065 5.A. 1.43, B. 5.72, C. 0.93, D. 2.86  6. A. 1.0, B. 4.0, . 2.0, D. 0.65  7.A. 15.5, B. 8.0, C. 11.0, D. 58.5

Describe with the aid of a labelled diagram how to seperate  i) Acetone-water Azeotrope using solvent extractive distillation ii)Acetone-Methano azeotrope using salt effective extractive distillation