Application: Topsøe’s Diesel Upgrading process can be applied for improvement of a variety of diesel properties, including reduction of diesel specific gravity, reduction of T90 and T95 distillation (Back-end-shift), reduction of aromatics, and improvements of cetane, cold-flow properties, (pour point, clouds point, viscosity and CFPP) and diesel color reduction (poly shift). Feeds can range from blends of straight-run and cracked gas oils up to heavy distillates, including light vacuum gasoil.
Description: Topsøe’s Diesel Upgrading process is a combination of treating and upgrading. The technology combines state-of-the-art reactor internals, engineering expertise in quality design, high-activity treating catalyst and proprietary diesel upgrading catalyst. Every unit is individually designed to improve the diesel property that requires upgrading. This is done by selecting the optimum processing parameters, including unit pressure and LHSV and determining the appropriate Topsøe high-activity catalysts and plant lay-out. The process is suitable for new units or revamps of existing hydrotreating units.
In the reactor system, the treating section uses Topsøe’s high-activity CoMo or NiMo catalyst, such as TK-575 BRIM or TK-576 BRIM, to remove feed impurities such as sulfur and nitrogen. These compounds limit the downstream upgrading catalyst performance, and the purified stream is treated in the downstream upgrading reactor. Reactor catalyst used in the application is dependent on the specific diesel property that requires upgrading. Reactor section is followed by separation and stripping/fractionation where final products are produced.
Like the conventional Topsøe hydrotreating process, the diesel upgrading process uses Topsøe’s graded-bed loading and high-efficiency patented reactor internals to provide optimal reactor performance and catalyst utilization. Topsøe’s high-efficiency internals are effective for a wide range of liquid loading. Topsøe’s graded-bed technology and the use of shape-optimized inert topping material and catalyst minimize the pressure drop build-up, thereby reducing catalyst skimming requirements and ensuring long catalyst cycle lengths.
Licensor: Haldor Topsøe A/S.