Question

Asked Feb 23, 2019

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A drier can process 800 lbs per day of a material that is 90%-by-weight H2O and 10%-by-weight solids. This drier produces an intermediate that is 20%-by-weight water. This intermediate is then dried in an oven. This oven produces a final product that contains 2%-by-weight water.

a. Draw a schematic of this process (hint: there are 2 units, a drier and an oven)

b. What is the mass of water in all streams leaving the drier and the oven?

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Step 1

Part (a)

Let the basis of the calculations be 800 lbs feed/day. Solids are represented by ‘S’ and water by ‘W’. There are two units in the given process: Dryer and Oven.

*n _{I}* is the mass flowrate of the intermediate,

The schematic diagram of the given process is drawn as:

Step 2

Part (b)

Apply mass balance on solids around the dryer as:

Step 3

Apply mass balance on water around the dryer and use the above result to cal...

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