A multiple recycle-loop problem formulated by cavett1 and shown in Figure 10.36 has been used extensively to test tearing, sequencing, and convergence procedures. The flowsheet is the equivalent of a four-theoretical-stage, near-isothermal distillation (rather than the conventional near-isobaric type), for which a patent by Gunther2? exists. The flowsheet does not include necessary mixers, compressors, pumps, valves, and heat exchangers to make it a practical system. For the specifications shown on the drawing, determine the component flow rates for all streams in the process.

Partial condenser stage 100F, 814.7 psia F1 Flash V2 L1 Feed stage 120F, 284.7 psia F2 Flash Feed 120F, 284.7 psia Ibmol/h Component 358.2 4965.6 339.4 N2 co2 H2 V3 2995.5 Lower stage F3 Flash C2 2395.5 96F, 63.7 psia 2291.0 604.1 1539.9 iCs 790.4 1129.9 1764,7 2606.7 1844.5 L3 Partial reboiler stage 85F, 27.7 psia nCg nC12 F4 1669.0 Flash 831.7 1214.5 La