Example 8.1-1 Equipment Encyclopedia condenser www.wiley.com/college/felder Energy Balance on a Condenser Acetone (denoted as Ac) is partially condensed out of a gas stream containing 66.9 mole% acetone vapor and the balance nitrogen. Process specifications and material balance calculations lead to the flowchart shown below. 100 mol/s 0.669 mol Ac(v)/mol 0.331 mol Ny/mol 65°C, 1 atm 8 CHAPTER 8 Balances on Nonreactive Processes (%) CONDENSER 63.55 mol Ac(1)/s 20°C, 5 atm The process operates at steady state. Calculate the required cooling rate. Use H, instead of Ú, for a closed constant-pressure system, since Q=AH for such systems. 36.45 mol/s 0.092 mol Ac(v)/mol 0.908 mol Nymol 20°C. 5 atm Solution We will follow the procedure given preceding this example. Perform required material balance calculations. None-are-required in this example. Write and simplify the energy balance. + W, = AH+AE+AEp. There are no moving parts in the system and no energy is transferred by electricity or radiation, so W, = 0. No significant vertical For this open steady-state system mille

2. Consider the P-x-y diagram at 300 K for A-B mixtures at right. (a) What are the vapor pressures of A and B at 300 K? (b) A 25 mol-% A vapor mixture is isother- mally compressed from 1.5 to 2.0 bar. Does a 2-phase mixture form, and if so, what is the mole fraction of A in each resulting phase? (c) Using data at the azeotrope, compute the van Laar parameters a and 3 for A-B mix- tures at this temperature. P (bar) 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 XA or YA

Calculate the fugacity of dry ice (CO₂ ice) at the triple point (T=216.55 °K, P-5.12673 bar). Assume that the thermal properties of the vapor phase of carbon dioxide are described by the Peng-Robinson equation of state. Express your result in bar and and round your numerical answer to one decimal digit.