Hydrocracking process with integral intermediate hydrogen separation and purification

摘要

An intermediate hydrogen separation and absorption-based purification system is integrated with a hydrocracking process for the production of relatively lower molecular weight products from a relatively heavy feedstock including sulfur-containing and nitrogen-containing hydrocarbon compounds. The integrated process allows the processing of heavy hydrocarbon feedstock having high nitrogen and high sulfur contents in a single-stage configuration and the using of noble metal catalyst in the hydrocracking reaction zone. The integrated process increases the overall catalytic activity and hydrogenation capability to produce superior distillate products.

主权项

1. An integrated hydrotreating and single-stage hydrocracking process comprising:
a. hydrotreating a feedstock with a hydrotreating catalyst in the presence of hydrogen to produce a hydrotreated effluent containing a reduced amount of sulfur-containing and/or nitrogen-containing hydrocarbon compounds as compared to the feedstock; b. separating the hydrotreated effluent in a high-pressure separation zone to produce a vapor stream and a hydrocarbon liquid stream; c. purifying at least a portion of the vapor stream in an absorption zone in the presence of at least a portion of relatively heavy components of the vapor stream from step (b) to produce a high purity hydrogen gas stream and a fuel gas stream; d. hydrocracking at least a portion of the hydrocarbon liquid stream from step (b) with a hydrocracking catalyst in the presence of hydrogen gas in a single-stage reactor configuration to produce a hydrocracked effluent, wherein the hydrogen gas includes at least a portion of the high purity hydrogen gas stream from step (c); and e. separating and fractionating the hydrocracked effluent.