Page 133 - Analysis, Synthesis and Design of Chemical Processes, Third Edition
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3. What are the two main methods for sequencing multiproduct processes?
4. Give one advantage and one disadvantage of using single-product campaigns in a multiproduct plant.
5. What is the difference between a zero-wait and a uis-process?
Problems
Consider the processes given in Example 3.3. Determine the number of batches that can be produced
6. in a month (500 h) using a series of single-product campaigns when the required number of batches
for product A is twice that of either product B or product C.
Consider the processes given in Examples 3.3 and 3.4. Determine the number of batches that can be
produced in a month (500 h) using a multiproduct campaign strategy with the sequence
7.
ACBACBACB. Are there any other sequences for this problem other than the one used in Example
3.4 and the one used here?
Consider the multiproduct batch plant described in Table P3.8.
Table P3.8 Equipment Processing Times for Processes A, B, and C
8.
It is required to produce the same number of batches of each product. Determine the number of
batches that can be produced in a 500 h operating period using the following strategies:
a. Single-product campaigns for each product
b. A multiproduct campaign using the sequence ABCABCABC...
c. A multiproduct campaign using the sequence CBACBACBA...
Consider the process given in Problem 3.8. Assuming that a single-product campaign strategy is used
over a 500 h operating period and further assuming that the production rates (for a year = 6,000 h) for
9. products A, B, C are 18,000 kg/y, 24,000 kg/y, and 30,000 kg/y, respectively, determine the minimum
volume of product storage required. Assume that the product densities of A, B, and C are 1100, 1200,
3
and 1000 kg/m , respectively.
Using the data from Tables P3.10(a) and (b), and following the methodology given in Section 3.6,
determine the number of batches and limiting reactor size for each product.
Table P3.10(a) Production Rates for A, B, and C
