A problem is posed as follows: It is desired to mix three LPG (liquefied petroleum gas) streams denoted by A, B, and C in certain proportions so that the final mixture will meet certain vapor-pressure specifications. These specifications will be met by a stream of composition D as indicated in the following table. Calculate the proportions in which streams A, B, and C must be mixed to give a product with a composition of D. The values are liquid volume percent, but the volumes are additive for these compounds.
Component | Stream A | Stream B | Stream C | Stream D |
C2 | 5.0 |
|
| 1.4 |
C3 | 90.0 | 10.0 |
| 31.2 |
iso-C4 | 5.0 | 85.0 | 8.0 | 53.4 |
n-C4 |
| 5.0 | 80.0 | 12.6 |
iso-C5+ |
|
| 12.0 | 1.4 |
Total | 100.0 | 100.0 | 100.0 | 100.0 |
The subscripts on the Cs represent the number of carbons, and the + sign on C5+ indicates all compounds of higher molecular weight as well as iso-C5. Does this problem have a unique solution?
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