Targeted hydrogenation hydrocracking

Inactive Publication Date: 2009-06-25
CHEVROU USA INC
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Problems solved by technology

The patents disclosed above do not address the following issues:1. Production of on-specification Jet and Diesel products during low conversion HCR operation.2. Avoidance of undesirable over-saturation of the unconverted oil (UCO) from the HCR unit feeding FCC unit and reduce hydrogen consumption.

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  • Targeted hydrogenation hydrocracking
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[0043]The following table highlights the advantages of the process scheme of this invention over a conventional process scheme for a 65,000 BPOD (barrel per operating day) hydrocracking unit: The table indicates that there is no need in the current invention for post treatment in order to reach desired product specifications. Furthermore, less hydrogen is consumed in the scheme of the current invention than in the conventional case.

Conventional Process SchemeNew Process SchemeProcess SchemeSingle Stage Once-ThroughTargeted-Hydrogenation HydrocrackingFresh Feed Rate, BPSD65,00065,000Overall LHSV, 1 hr0.7-0.90.7-0.9Product YieldBaseSimilar to Base caseJet & Diesel QualityNeeds post treatment for aromaticOn specification product at all desiredsaturation at low conversionconversions:Jet: S 24 mmDiesel: S 50Chemical H2 ConsumptionBaseBase - 160 SCFB at 60% conv.Base - 100 SCFB at 40% conv.Base - 50 SCFB at 30% conv.

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Abstract

This invention is directed to a process scheme in which a partial conversion hydrocracking (HCR) unit, preferably preceded by a hydrotreating unit, feeds unconverted oil to a FCC (fluid catalytic cracking ) unit. Most refineries run the FCC unit at the full capacity for optimal asset utilization. During shutdowns of Residue Desulfurization unit(s) which feed an FCC unit, it is desirable to reduce the conversion in the FCC feed hydrocracker. In this way, the feed to FCC unit is maximized. Jet and Diesel products that conform to specifications may be produced during low conversion HCR operation. Furthermore, undesirable over-saturation of the unconverted oil (UCO) from the HCR unit feeding the FCC unit can be avoided. Excess hydrogen consumption can also be avoided. Normally, further aromatic saturation of the middle distillate products from a low conversion HCR is achieved in a separate, post treatment, unit.

Description

FIELD OF THE INVENTION[0001]This invention is directed to a partial conversion hydrocracking (HCR) unit, in which unconverted oil is fed to a Fluid Catalytic Cracking (FCC) unit.BACKGROUND OF THE INVENTION[0002]In the refining of crude oil, vacuum gas oil hydrotreaters and hydrocrackers are employed to remove impurities such as sulfur, nitrogen and metals from the feed. Typically, the middle distillate boiling material (boiling in the range from 250° F.-735° F.) from VGO hydrotreating or moderate severity hydrocrackers does not meet the smoke point, the cetane number or the aromatic specification required.[0003]Removal of these impurities in subsequent hydroprocessing stages (often known as upgrading), creates more valuable middle distillate products. Hydroprocessing technology (which encompasses hydrotreating, hydrocracking and hydrodewaxing processes) aims to increase the value of the crude oil by fundamentally rearranging molecules. The end products are also made more environment...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10G69/02
CPCC10G45/02C10G65/12C10G47/02C10G65/04C10G69/00C10G69/04C10G69/14C10G2300/202C10G2300/307C10G2400/02C10G2400/08B01D3/143C10G70/043C10G2400/20C10G47/00
Inventor BHATTACHARYA, SUBHASIS
Owner CHEVROU USA INC
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