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Whoever is good at English, please help out. Thank you! Grading and Guard Catalysts: SENTRY™ OptiTrap is a large-volume inert top-bed support material. It features high mechanical strength and excellent resistance to wear. Its “medallion” shape improves flow distribution within reactors compared to conventional spherical materials. It also offers a higher void fraction than traditional spheres and rasching rings, which is useful for providing more space for particulates that are often present in feedstocks. SENTRY™ OptiTrap is an active hollow cylinder that functions as both a guard against particulates and a mechanism for capturing them. It has large macropores that allow particulates to enter the material, thereby preventing their accumulation within the main catalyst bed. This material boasts superior crush strength and wear resistance compared to other hollow cylindrical shapes. SENTRY™ OptiTrap is an active hollow cylinder with a high void fraction, offering excellent resistance to fouling. It is designed to capture medium and small-sized particulates that pass through it. Additionally, its catalytic properties help to slow down the process of coking and fouling, thus protecting the main catalyst bed. MaxTrapVGO is our most active NiMo catalyst, with good HDM activity and the ability to absorb metals. In addition to HDM activity, MaxTrapVGO also exhibits good HDS and HDN activity. 2.2. First Stage Catalyst: The catalyst used in the pretreatment stage, as proposed, is ASCENT DN-3551. ASCENT Catalyst Technology represents a new alumina-based technology that improves metal dispersion and enhances the accessibility of active metals, thanks to a balanced combination of Type I and Type II sites. The key advantages of ASCENT include high performance in ULSD and HDN processes, along with reduced hydrogen consumption. Its improved regeneration capabilities enable conventional regeneration methods and better economic efficiency over multiple cycles. ASCENT DN-3551 is our most widely used pretreatment catalyst. It was developed specifically for use with AGO, VGO, and a variety of heavier feedstocks, including DAOs and atmospheric residues. Its pore size distribution is optimized to handle feedstocks with higher levels of CCR and metals. It is intended for use in heavy oil hydrotreaters, such as those used in first-stage hydrocracking and VGO/CFH hydrotreating processes, where diffusion limitations can affect catalyst performance. Last edited by wawaxxh on 2009-2-2 18:32