Application: Hydrotreating of light and middle distillates and various gas oils, including cracked feedstocks (coker naphtha, coker LGO and HGO, visbreaker gas oil, and LCO) using the ISOTREATING Process for deep desulfurization, denitrification and aromatics saturation and to produce low-sulfur naphtha, jet fuel, ultra-low sulfur diesel (ULSD), or improvedquality FCC feed.
Description: Feedstock is mixed with hydrogen-rich treat gas, heated and reacted over high-activity hydrogenation catalyst (1). Several CoMo and NiMo catalysts are available for use in the ISOTREATING Process. One or multiple beds of catalyst(s), together with Chevron Lummus Global’s advanced high-efficiency reactor internals for reactant distribution and interbed quenching, are used.
Reactor effluent is cooled and flashed (2) producing hydrogen-rich recycle gas, which, after H2S removal by amine (3), is partially used as quench gas while the rest is combined with makeup hydrogen gas to form the required treat gas. An intermediate pressure level flash (4) can be used to recover some additional hydrogen-rich gas from the liquid effluent prior to the flashed liquids being stripped or fractionated (5) to remove light ends, H2S and naphtha-boiling range material, and/or to fractionate the higher boiling range materials into separate products.
Operating conditions: Typical reactor operating conditions can range from 600 –2,300 psig and 500 –780°F, 350 –2,000 psia hydrogen partial pressure, and 0.6-3 hr –1 LHSV, all depending on feedstock(s) and product quality objective(s).
Yields: Depends on feedstock(s) characteristics and product requirements. Desired product recovery is maximized based on required flash point and/or specific fractionation specification. Reactor liquid product (350°F plus TBP material) is maximized through efficient hydrogenation with minimum lighter liquid product and gas production. Reactor liquid product (350°F plus) yield can vary between 98 vol% from straightrun gas oil feed to >104 vol% from predominantly cracked feedstock to produce ULSD (