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Short contact time FCC process

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

AI Technical Summary

Problems solved by technology

Thermal cracking in an 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.
These short contact times can result in improved gasoline yields and lower coke and dry gas make from such heavier feeds.

Method used

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  • Short contact time FCC process
  • Short contact time FCC process

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example

[0040] This example relates to a short contact time FCC riser reactor. Vapor residence times in the riser are in the range of 3 to 4 seconds. Process performance data collected during a commercial monitoring test period were used to tune FCC model software program for representing base case operation. Selected feedstock inspections are listed in Table 1:

TABLE 1Feedstock PropertiesGravityAPI19Aniline PointDEG F.165SulfurWT %2.921NitrogenPPMW1897Basic NitrogenPPMW728Total P / N / AWT %Total Paraffins11.64Total Naphthenes26.46Total Aromatics61.90HPLC-2 AnalysisWT %Saturates38.43Aromatic Ring23.97Class 1Aromatic Ring13.92Class 2Aromatic Ring11.70class 3Aromatic Ring6.78Class 4Polars5.20GC DistillationDEG F.IBP5115% Off62210% Off66830% Off74950% Off81370% Off88290% Off97695% Off1019EP1093

[0041] Commercially available equilibrium catalyst properties are listed in Table 2. Using these feed and catalyst properties, the FCC model software was used to develop a base product yield slate for the ...

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Abstract

This invention relates to a short contact time (SCT) fluid catalytic cracking (FCC) process for improving the yield of distillates and gasoline. An SCT FCC process combines staging the FCC conversion process with interstage molecular separation of multi-ring aromatic species wherein separation of cat bottoms and recycling the separated stream containing saturates and 1- and 2-ring aromatics to the FCC unit results in improved yields of gasoline and other distillates while decreasing bottoms yields.

Description

CROSS REFERENCE TO RELATED APPLICATION [0001] This application claims benefit of U.S. Provisional Patent Application Ser. No. 60 / 665,899 Mar. 28, 2005 and U.S. Provisional Patent Application Ser. No. 60 / 668,532 filed Apr. 5, 2005.FIELD OF THE INVENTION [0002] This invention relates to a short contact time (SCT) fluid catalytic cracking (FCC) process for improving the yield of distillates and gasoline. More particularly, an SCT FCC process combines staging the FCC conversion process with interstage molecular separation of multi-ring aromatic species wherein separation of FCCU bottoms and recycling the separated stream containing saturates and 1- and 2-ring aromatics to the FCC unit results in improved yields of gasoline and other distillates while decreasing bottoms yields. 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 molecu...

Claims

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Application Information

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IPC IPC(8): C10G9/00
CPCC10G11/18C10G21/00C10G25/00C10G2400/02C10G2300/44C10G2300/80C10G31/11
Inventor SWAN, GEORGE A. IIIMON, EDUARDOLOWENTHAL, STEVEN S.COOK, BRUCE R.
Owner EXXON RES & ENG CO
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