https://doi.org/10.1016/j.egypro.2014.12.438
“Figure 4 (left) shows the effect of solvent flow rate on the ammonia vacuum regeneration efficiency. The ammonia concentration before reneration is 0.3 M, the absolute pressure in the gas side is 40 kPa and the temperature is 333 K. The solvent flow rate is significant to the ammonia removal efficiency. The ammonia removal efficiency could reach a high value only at a very low solvent flow rate, for instance, the ammonia removal efficiency at a solvent flow rate of 5 ml/min is only 49%. Hence, we cycle the ammonia after regeneration back to the solvent tank as a continous regeneration process. Figure 4 (right) shows the NH3 concentration and the NH3 removal efficiency as a function of time in a continous membrane vacuum regeneration process. The experimental conditions are same to that in Figure 4 (left). The total volume of the solvent is 600 ml and the solvent flow rate is 50 ml/min which gives the time of one cycle as 12 minutes. In the continous process, the ammonia removal efficiency could reach 80% in about 7 cycles (approximately 80 minutes). Taking the solvent handling capacity into consideration, the continous process is much better than the one cycle process. The study for the ammonia membrane vacuum regeneration is primary and more detaided work is required for obtaining suitable operation
conditions and better understanding of the process.”