شبیه سازی و بررسی اثرات جذب سطحی H2S توسط غربال مولکولی 4 برای جداسازی از گاز طبیعی.

One of the widely used methods to remove acid gas is surface adsorption using solid molecular sieves. The advantages of H₂S adsorption with molecular sieves can be seen in the reversibility of the process, chemical and thermal stability, no secondary product, and the high selectivity of H₂S in these adsorbents. Therefore, in this study, Aspen-Adsim software was used to investigate the effect of various parameters on adsorption of H₂S on 4A molecular sieve adsorbent. The desired bed is considered vertical and one-dimensional. The results related to the breakthrough curves and saturation time showed that the maximum amount of adsorption occurred in the early times. As the adsorption time increases, the rate of H₂S adsorption decreases. The results of investigating the effect of operating parameters showed that increasing the tower pressure from 90 to 104 bar reduces the output H2S content by 21 ppm. Also, reducing the feed temperature showed significant results on the amount of H₂S absorption and the reduction of the output H₂S content, so that for every one degree of temperature reduction in the feed gas temperature, the dew point temperature of the output was reduced by 1.6°C. Due to the high amount of absorbent and its heat capacity compared to the amount of H₂S in the gas phase, a slight temperature increase occurs along the tower so that the difference between the inlet and outlet temperatures does not exceed 1˚C. According to the breakthrough curve, it was also determined that after 7920 seconds, the entire bed of the tower is saturated with H₂S molecules. [ABSTRACT FROM AUTHOR]