FCC process combining molecular separation with staged conversion

a technology of molecular separation and stage conversion, which is applied in the direction of hydrocarbon oil cracking process, hydrocarbon oil treatment products, etc., can solve the problems of high conversion fcc unit, general undesirable thermal cracking in fcc unit, and inability to adjust catalyst formulation and/or conditions. , to achieve the effect of low energy molecular separation

Inactive Publication Date: 2006-10-19
EXXON RES & ENG CO
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  • Abstract
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  • Application Information

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Problems solved by technology

Thermal cracking in a FCC unit is generally undesirable as this type of cracking can result in the generation of light gases, such as methane, in addition to coke.
Single stage, high conversion FCC units are not well suited to adjusting catalyst formulation and / or conditions to achieve enhanced distillate quality suitable for diesel blend stocks.
Depletion of hydrogen content of the distillate is the root cause of its relatively poor cetane number.

Method used

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  • FCC process combining molecular separation with staged conversion
  • FCC process combining molecular separation with staged conversion
  • FCC process combining molecular separation with staged conversion

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[0073] With reference to FIG. 2, using a computer model, the invention was compared to current operation for a dual riser FCC unit operated at the following conditions: fresh feed (FF) rate of 73 kB / D (453.6 mT / hr), 6.1 (wt / wt) catalyst / oil ratio, vapor residence time of 2.4 seconds, and riser top temperature of 536° C. Conditions were adjusted in the independent risers as follows:

Riser 102 (Zone 1)Riser 104 (Zone 2)Feed rate, mT / hr453.6166.4Catalyst / oil ratio (wt / wt)3.58.2Vapor residence time, sec0.72.6Riser Top Temperature (° C.)516545

[0074] Riser 102 functions as the lower severity zone, while riser 104 functions as the higher severity zone. Combined 343° C.+ product from the fractionator was passed through a selective membrane model to achieve a lower aromatics content stream for recycle to riser 104. The combined product yield slate from the process of this invention is compared with the current operation at constant coke yield:

Wt % FFInventionComparative BaseC4− gas produc...

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Abstract

This invention relates to fluid catalytic cracking (FCC) process for improving the quality of distillates suitable as blend stocks for diesel fuels. The FCC process combines staging the FCC conversion process with interstage molecular separation of multi-ring aromatic species. Lower and higher severity reaction zones in the riser of the FCC reactor are combined with selective molecular separations to improve the production of diesel quality distillates.

Description

CROSS REFERENCE TO RELATED APPLICATION [0001] This application claims benefit of U.S. Provisional Patent Application Ser. No. 60 / 665,900 filed Mar. 28, 2005 and U.S. Provisional Patent Application Ser. No. 60 / 668,518 filed Apr. 5, 2005. FIELD OF THE INVENTION [0002] This invention relates to fluid catalytic cracking (FCC) process for improving the quality of distillates suitable as blend stocks for diesel fuels. More particularly, a FCC process combines staging the FCC conversion process with interstage molecular separation of multi-ring aromatic species. BACKGROUND OF THE INVENTION [0003] Conversion of petroleum feeds to more valuable products is important to petroleum processes such as fluidized catalytic cracking (FCC) and coking. In the FCC process, high molecular weight feeds are contacted with fluidized catalyst particles in the riser reactor of the FCC unit. The contacting between feed and catalyst is controlled according to the type of product desired. In catalytic cracking ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10G9/00C10G15/00
CPCB01D61/246B01D61/362B01D71/54B01D71/64C10G1/00C10L1/08C10G11/18C10G3/49C10G3/57C10G2300/1055C10G2400/04C10G1/002Y02P30/20B01D71/642B01D61/3621B01D61/2461
Inventor SWAN, GEORGE A. IIICOOK, BRUCE R.HENRY, B. ERIKLOWENTHAL, STEVEN S.
Owner EXXON RES & ENG CO
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