Figure E17.3(a) shows the schematic of a jacketed flash vessel in which a mixture of CO and methanol is being separated. The inlet temperature of the heating medium stream is 90°C and its specific heat is similar to that of water. There is no phase change of the heating medium in the jacket. Compare the transient response of the flash vessel outlet temperature and its level for the “constant duty” and “LMTD” options when the inlet feed flowrate is reduced to 10 kmol/h. Assume no change in the inlet temperature and flowrate of the heating medium. The vessel is well insulated; that is, heat loss to the environment may be assumed to be negligible.

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Feed 30°C 5 bar 1 100 kmol/h Умеон = 0.9 Yco₂ = 0.1 FC FC-1101 CV-1101 AP = 1 bar 2 Heating Fluid In 3 V-1101 70°C P = 3.0 bar (LC) 5 (PC Heating Fluid Out CV-1102 AP = 1 bar CV-1103 AP = 1 bar 4 6 Vapor Product Liquid Product