Nonequilibrium modeling and simulation of reactive absorption of CO2 using ammonia and sodium hydroxide solution

In this research, carbon dioxide reactive absorption process in ammonia and sodium hydroxide solution was modeled and simulated. Rate based model with unsteady state film model was used in the process modeling considering two mass transfer directions. The model equations including a set of ordinary and partial differential equations were solved simultaneously using finite difference and method of lines. Simulation of the process was carried out using different stage numbers. Experimental data form absorption pilot plant was used for evaluation of the process simulation. The simulation with 60 stages has 4.36 percent minimum devotion. On the other hand, result from rate base model was compared with enhancement factor method. The results showed that simulation results were more accurate when rate based model has been used.