Figure 11.64 presents the PFD of a process for the production of organic fibers (Smith, 2005). In the process, the organic solvent is removed from the fibers in dryer D-100 using circulated warmed air, which is then cooled before entering adsorbing column A-100 where the

solvent is removed by a stream of water. The mixture of water and solvent is then separated in distillation column T-100, and the water is recycled. The process is serviced by three types of utilities: steam at \(150^{\circ} \mathrm{C}\), cooling water at \(20^{\circ} \mathrm{C}\), and refrigerant at \(-5^{\circ} \mathrm{C}\); possible changes in sensible heat of both the cooling water and refrigerant can be neglected.

(a) Compute MER targets for this process at \(\Delta T_{\min }=10^{\circ} \mathrm{C}\).

(b) Design a HEN to meet the MER targets at \(\Delta T_{\min }=10^{\circ} \mathrm{C}\). The design should utilize no more than 12 heat exchangers (including utility coolers and heaters).

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C is in [kW/C] 170C 2.000 kW C=200 180C C=10 C=8 Feed 100C 300C 300C 180C 2,000 kW R-100 960 kW 100C 90 kW C=1.5 (W) C=200 100C 2,000 kW C-200 110C Product B C=10 120C W 160C T-101 1,000 kW 155C 800 kW T-100 200C 195C Product A C=220 1,100 kW Figure 11.63 PFD for a process for the manufacture of products A and B from R.