Design a steam ejector system for the acrylic acid distillation tower shown in Figure 23.14 and discussed in Example 23.9. Steam is available at 180°C and 1000 kPa, and the air leaking into the system must be delivered to the battery limit at a pressure of 120 kPa. For this system, determine the flow of steam needed to educt the air flow determined from Example 23.9.

1. Using a single-stage ejector 

2. Using a two-stage, noncondensing ejector

Example 23.9

Estimate the leak of air into a system comprising the acrylic acid tower and associated equipment and piping for the process flow diagram shown in Figure 23.14.

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Overhead CW Condenser Acrylic Acid Tower Acrylic/Acetic Acid Feed Reboiler Ips T = 89°C P = 15.7 kPa 30°C 40°C (FIC T = 48°C P = 7.0 kPa (LIC) Q Reflux Pump Vent Gas Overhead Reflux Drum LIC Acetic Acid Product Acrylic Acid Product