A continuous rotary vacuum filter operating with a pressure drop of 0.7 atm is to handle the

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A continuous rotary vacuum filter operating with a pressure drop of 0.7 atm is to handle the feed slurry of Prob. 29.3. The drum submergence is to be 15 percent. What total filter area must be provided to match the overall productive capacity of the filter press described in Prob. 29.4? Drum speed is 2 r/min.

Prob. 29.3

The data in Table 29.6 were taken in a constant-pressure filtration of a slurry of CaCO3 in H2O. The filter was a 6-in. filter press with an area of 1.0 ft2. The mass fraction of solids in the feed to the press was 0.139. Calculate the values of α, Rm, and cake thickness for each of the experiments. The temperature is 70°F.

Table 29.6

TABLE 29.6 Data from constant-pressure filtration 5-lb,/in. pressure drop (1) Filtrate, Time, lb S 0 2 4 6 8

Prob. 29.4

The slurry of Prob. 29.3 is to be filtered in a press having a total area of 8 m2 and operated at a constant pressure drop of 2 atm. The frames are 36 mm thick. Assume that the filter medium resistance in the large press is the same as that in the laboratory filter. Calculate the filtration time required and the volume of filtrate obtained in one cycle.

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Unit Operations Of Chemical Engineering

ISBN: 9780072848236

7th Edition

Authors: Warren McCabe, Julian Smith, Peter Harriott

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