Hydrocracking Moderate Pressure Process by ExxonMobil

Application: Convert a wide variety of feedstocks including vacuum deep-cut gas oil, coker gas oils, de-asphalted oil (DAO), and FCC cycle oils into high-quality, low-sulfur fuels using ExxonMobil Research and Engineering Company’s (EMRE) moderate pressure hydrocracking (MPHC) process.

Products: Products include a wide range of high-quality, low-sulfur distillates and blending stocks including LPG, high-octane gasoline, highquality reformer naphtha. Unconverted bottoms product from the MPHC unit is very low in sulfur and is an excellent feedstock for fluid catalytic cracking (FCC), lube-oil basestock production, steam cracking and lowsulfur fuel oil.

Description: The process uses a multiple catalyst system in multi-bed reactor(s) that incorporates proprietary advanced quench and redistribution internals (Spider Vortex). Heavy hydrocarbons and recycle gas are preheated and contact the catalyst in the trickle-phase fixed-bed reactor(s). Reactor effluent is flashed in high- and low-temperature separators. An amine scrubber removes H2S from the recycle gas before it gets compressed and re-circulated back to the unit. An optimized, low cost stripper/fractionator arrangement is used for product recovery.

When higher-quality distillates are required, the addition of a lowcost, highly integrated distillate post-treating unit (PTU) can be incorporated in the design to meet or exceed high-pressure hydrocracking product quality at lower capital cost and hydrogen consumption.

Licensor: ExxonMobil Research and Engineering Co.