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Coulson & Richardson’s Chemical Engineering Vol 2, 3-Solution Manual [EXP-2846]

222 SOLVED PROBLEMS

(a) Calculate the terminal falling velocities in water of glass particles of diameter 12 mm and density 2500 kg/m3

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For spheres, a take balance gives: R'(\pi /...

(a) Consider a gas-liquid-solid hydrogenation such as that described in (b) in which the reaction takes place within a porous catalyst particle in a trickle bed reactor. Assume that the liquid containing the compound to be hydrogenated reaches a steady state with respect to dissolved hydrogen

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(a) Hydrogenation takes place in a sequence of ste...

(c) A liquid fluidised bed consists of equal volumes of spherical particles 0.5 mm and 1.0 mm in diameter.

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A force balance gives: 3\pi \mu du_{c}=(\pi...

0.126 kg/s of a solid product containing 4 per cent water is produced in a dryer from a wet feed containing 42 per cent water on a wet basis. Ambient air at 294 K and of 40 per cent relative humidity is heated to 366 K in a preheater before entering the dryer from which it leaves at 60 per cent

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From the humidity chart, Figure 13.4 , air at 294 ...

0.4 kg/s of dry sea-shore sand, containing 1 per cent by mass of salt, is to be washed with 0.4 kg/s of fresh water running countercurrently to the sand through two classifiers in series. It may be assumed that perfect mixing of the sand and water occurs in each classifier and that the sand

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The problem involves a mass balance around the two...

1 Mg of dry mass of a non-porous solid is dried under constant drying conditions in an air stream flowing at 0.75 m/s. The area of surface drying is 55 m^2. If the initial rate of drying is 0.3 g/m^2s, how long will it take to dry the material from 0.15 to 0.025 kg water/kg dry solid? The critical

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During the constant rate period, that is whilst th...

1.25 kg/s of a solution is concentrated from 10 to 50 per cent solids in a triple-effect evaporator using steam at 393 K, and a vacuum such that the boiling point in the last effect is 325 K. If the feed is initially at 297 K and backward feed is used, what is the steam consumption, the temperature

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Making a mass balance: Solid (kg/s) Liquor (kg...

1.9 kg/s of a liquid containing 10 per cent by mass of dissolved solids is fed at 338 K to a forward-feed double-effect evaporator. The product consists of 25 per cent by mass of solids and a mother liquor containing 25 per cent by mass of dissolved solids. The steam fed to the first effect is dry

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The percentage by mass of dissolved and undissolve...

10 Mg of a solution containing 0.3 kg Na2CO3/kg solution is cooled slowly to 293 K to form crystals of Na2CO3.10H2O. What is the yield of crystals if the solubility of Na2CO3 at 293 K is 21.5 kg/100 kg water and during cooling 3 per cent of the original solution is lost by evaporation?

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The initial concentration of the solution = 0.3 kg...

160 cm^3/s of a solvent S is used to treat 400 cm^3/s of a 10 per cent by mass solution of A in B, in a three-stage countercurrent multiple contact liquid–liquid extraction plant. What is the composition of the final raffinate?Using the same total amount of solvent, evenly distributed between the

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(a) Countercurrent operation Considering the solve...
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