关键词: 活性炭, 吸附, 脱氯剂, 床层空隙率, 传质系数, 床层穿透起点, 穿透持续时间

Abstract: Oil dechlorination is a key step in petroleum refining and processing, and the selection of appropriate dechlorinator is the core issue of this step. The dynamic adsorption process of HCl from oil was simulated using Aspen Adsorption on the basis of the static adsorption data of AC/Ca-Cu activated carbon-based dechlorinator. The results show that the time from the start of dynamic adsorption to complete breakthough for the dechlorinator is basically equal to the saturation duration of static adsorption,with a relative error of 2.5%. It is favorable for increasing the dynamic saturation adsorption capacity of the adsorption bed by increasing the HCl concentration in the feed or decreasing the feed flow-rate, but it will cause the breakthrough point to occur earlier. When the mass transfer coefficient is greater than or equal to 0.1 s^-1, it has almost no effect on the adsorption process. With the increase of bed voidage, the starting point of bed breakthrough is significantly advanced, requiring frequent regeneration of the dechlorinator during production. Using the AC/Ca-Cu activated carbon-based dechlorinator with a feed flow rate of 4 m³/h, a feed concentration of 0.001 mol/L, a mass transfer coefficient of 0.1 s^-1 ,and a bed voidage of 0.4, the elapsed time from the start of adsorption until the bed layer reaches complete breakthrough is approximately 3.9 h.

Key words: activated carbon, adsorption, dechlorinator, bed voidage, mass transfer coefficient, point of bed breakthrough, breakthrough duration