Hydrocracking Process by Chevron

Application: Convert naphthas, AGO, VGO, DAO, cracked oils from FCC units, delayed cokers and visbreakers, and intermediate products from residue hydroprocessing units using the Chevron Lummus Global ISOCRACKING Process.

Products: Lighter, high-quality, more valuable products: LPG, gasoline, catalytic reformer feed, jet fuel, kerosene, diesel and feeds for FCC, ethylene cracker or lube oil units.

Description: A broad range of both amorphous/zeolite and zeolitic catalysts, including noble-metal zeolitic catalysts, are used to tailor the ISOCRACKING Process exactly to the refiner’s objectives. In general, the process involves a staged reactor system with an initial stage of hydrotreating and partially hydrocracking the feed, and a subsequent stage continuing the conversion or product upgrade process in a more favorable environment.

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Feeds can be introduced in between stages using Chevron Lummus Global patented split-feed injection technology, or effluent flow paths can be arranged to best utilize hydrogen and minimize quench-gas requirements using proprietary SSRS (single-stage reaction sequenced) technology.

Most modern large-capacity flow schemes involving heavy sour gas oils require two reactors (1, 4) and one high-pressure separation system (2) with an optional recycle gas scrubber (5) and one recycle-gas compressor (8). The low-pressure separators (3), product stripper (6) and fractionator (7) provide the flexibility to fractionate products either in between reaction stages or at the tail-end, depending on desired product slate and selectivity requirements.

Single-stage options are used in once-through mode typically for mild hydrocracking or when a significant quantity of unconverted oil is required for FCC, lubes, or ethylene units. The single-stage recycle option is used for lower capacity units when economical. The reactors use patented internals technology called ISOMIX for near-flawless mixing and redistribution.

Licensor: Chevron Lummus Global LLC.


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