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Worksheet: DoF Analysis Dr. Lamm Supplemental Instruction Iowa State University Leader: Course: Instructor: Date: Shawn V. CH E 210 Dr. Lamm 1-31-2016 Practice Problems A liquid mixture containing 30 mol% benzene (B), 25 mol% toluene (T), and the balance xylene is fed into a distillation column. The bottoms product contains 98 mol% X and no B, and 96% of the X in the feed is recovered in this stream. The overhead product is fed into a second column. The overhead product of the second column contains 97% of the B in the feed to this column. The composition of this steam is 94 mol% B and the balance T. Calculate the percentage of benzene in the process feed that emerges in the overhead product from the second column. Calculate the percentage of toluene in the process feed that emerges in the bottom product from the second column. Seawater containing 3.5 wt% salts passes through a series of ten evaporators. Roughly equal quantities of water are vaporized in each of the ten units and then condensed and combined to obtain a product stream of fresh water. The brine leaving each evaporator is fed to the next one (except the tenth). The brine leaving the tenth evaporator contains 5.00 wt% salt. Draw a flow chart of the process that shows the first, fourth, and tenth evaporators. Determine the amount of fresh water that can be obtained from the process (kg fresh water/ kg feed). Determine the weight percentage of the salt in the solution leaving the fourth evaporator. 1060 Hixson-Lied Student Success Center 515-294-6624 [email protected] http://www.si.iastate.edu Methanol is synthesized from carbon monoxide and hydrogen in a catalytic reactor. The fresh feed to the process contains 32 mol% CO, 64 mol% H2, and the balance nitrogen. This stream is mixed with a recycle steam in a ratio 5 mol recycle / 1 mol fresh feed to produce the feed to the reactor, which contains 13 mol% nitrogen. A low single-pass conversion is obtained in the reactor. The reactor effluent goes to a condenser from which two streams emerge: a liquid product stream containing essentially all the methanol formed in the reactor, and a gas stream that contains all the CO, H2, and N2 leaving the reactor. The gas stream is split into two fractions: one is removed from the process as a purge stream, and the other is the recycle steam that combines with the fresh feed to the reactor. For a methanol production rate of 100 kmol/h, calculate the fresh feed rate (kmol/h), the molar flow rate and composition of the purge gas, and the overall and single-pass conversions.