The PFD in Figure 11.63 shows a process in which two liquid products, A and B, are produced from a feed stream of raw material R. In the process, the reactor feed is preheated to \(300^{\circ} \mathrm{C}\) and fed to an isothermal PFR, R-100, where the two products are produced. The reactor effluent at \(300^{\circ} \mathrm{C}\) is cooled to \(180^{\circ} \mathrm{C}\) and fed to column T-100, where Product A is withdrawn as distillate. The bottoms stream of T-100 is cooled to \(120^{\circ} \mathrm{C}\) and fed to column T-101 in which Product B is withdrawn as distillate and the unreacted raw materials withdrawn as bottoms, cooled to \(100^{\circ} \mathrm{C}\) and recycled. Figure 11.63 shows the stream temperatures and \(C\) values as well as the heat duties of all proposed heat exchangers.

(a) Compute MER targets and pinch temperatures for \(\Delta T_{\min }=10^{\circ} \mathrm{C}\).

(b) Design a HEN with the minimum number of heat exchangers that meets the MER targets.

Figure 11.63:-

Transcribed Image Text:

C is in [kW/C] C=10 Feed 100C W 300C 2,000 kW R-100 90 kW C=15 100C 300C 2,000 kW C=200 C=8 180C W 960 kW 180C 100C T-100 2,000 kW C=200 110C 160C 120C T-101 C=200 1,000 kW 155C Product B C=10 800 kW 170C 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.