Chemical Engineering Design Volume 6 4th. Edition by R. K. Sinnott | 9788131204511 | 8131204510 | Holooly

Coulson & Richardson’s Chemical Engineering Design Volume 6 [EXP-700]

113 SOLVED PROBLEMS

Question: 2.1

2000 kg of a 5 per cent slurry of calcium hydroxide in water is to be prepared by diluting a 20 per cent slurry. Calculate the quantities required. The percentages are by weight.

Verified Answer:

Let the unknown quantities of the 20% slurry and w...

Question: 11.4

A column is to be designed to separate a mixture of ethylbenzene and styrene. The feed will contain 0.5 mol fraction styrene, and a styrene purity of 99.5 per cent is required, with a recovery of 85 per cent. Estimate the number of equilibrium stages required at a reflux ratio of 8. Maximum column

Verified Answer:

Ethylbenzene is the more volatile component. ...

Question: 11.1

A feed to a column has the composition given in the table below, and is at a pressure of 14 bar and a temperature of 60ºC. Calculate the flow and composition of the liquid and vapour phases. Take the equilibrium data from the Depriester charts given in Chapter 8.

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For two phases to exist the flash temperature must...

Question: 12.9

A fluid whose properties are essentially those of o-dichlorobenzene is vaporised in the tubes of a forced convection reboiler. Estimate the local heat-transfer coefficient at a point where 5 per cent of the liquid has been vaporised. The liquid velocity at the tube inlet is 2 m/s and the operating

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Physical properties:

\text { boiling...

Question: 3.14

A furnace burns a liquid coal tar fuel derived from coke-ovens. Calculate the heat transferred in the furnace if the combustion gases leave at 1500 K. The burners operate with 20 per cent excess air. Take the fuel supply temperature as 50ºC (323 K) and the air temperature as 15ºC (288 K).

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Material balance Basis: 100 kg (as analysis is by ...

Question: 2.15

A hold tank is installed in an aqueous effluent-treatment process to smooth out fluctuations in concentration in the effluent stream. The effluent feed to the tank normally contains no more than 100 ppm of acetone. The maximum allowable concentration of acetone in the effluent discharge is set at

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Basis: increment of time Δt To illustrate the gene...

Question: 12.14

A jacketed, agitated reactor consists of a vertical cylinder 1.5 m diameter, with a hemispherical base and a flat, flanged, top. The jacket is fitted to the cylindrical section only and extends to a height of 1 m. The spacing between the jacket and vessel walls is 75 mm. The jacket is fitted with a

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\text { The baffle forms a continuous spira...

Question: 5.1

A pipeline connecting two tanks contains four standard elbows, a plug valve that is fully open and a gate valve that is half open. The line is commercial steel pipe, 25 mm internal diameter, length 120 m. The properties of the fluid are: viscosity 0.99 mNM^-2 s, density 998 kg/m^3. Calculate the

Verified Answer:

Cross-sectional area of pipe

=\frac{\pi}{4}...

Question: 6.5

A plant is producing 10,000 t/y of a product. The overall yield is 70 per cent, on a mass basis (kg of product per kg raw material). The raw material costs £10/t, and the product sells for £35/t. A process modification has been devised that will increase the yield to 75 per cent. The additional

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There are two ways of looking at the earnings to b...

Question: 10.1

A precipitate is to be continuously separated from a slurry. The solids concentration is 5 per cent and the slurry feed rate 5.5 m^3/h. The relevant physical properties at the system operating temperature are: liquid density 1050 kg/m^3, viscosity 4 cp (mNm^-2s), solid density 2300 kg/m^3, “cut-off

Verified Answer:

\text { Overflow rate, } Q=0.95 \times 5.5=...

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