Integrated staged catalytic cracking and staged hydroprocessing process

A hydrotreating and catalytic cracking technology, applied in hydrotreating process, hydrocarbon oil treatment, petroleum industry, etc., can solve problems such as bad production of a large amount of light saturated vapor products

Inactive Publication Date: 2002-01-23
EXXON RES & ENG CO
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  • Abstract
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  • Claims
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Problems solved by technology

In addition, the process undesirably produces large amounts of light saturated vapor products due to deleterious hydrogen transfer from heavier cracked products back to lighter olefinic products

Method used

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  • Integrated staged catalytic cracking and staged hydroprocessing process
  • Integrated staged catalytic cracking and staged hydroprocessing process

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Embodiment Construction

[0023] Catalytic cracking is a well-known process in the field of petroleum refining and generally refers to the conversion of large hydrocarbon molecules into smaller hydrocarbon molecules by splitting at least one carbon-carbon bond. For example, a large paraffin molecule can be cracked into smaller paraffins and olefins, and a large olefin molecule can be cracked into two or more smaller olefin molecules. It can also crack molecules with long side chains containing aromatic or naphthenic rings.

[0024] It has been found that the quality of the light olefin products produced by the catalytic cracking process and the quality of the distillate can be improved by initially incorporating short contact time reaction steps into the overall catalytic cracking process. After said short contact time reaction step, the gas oil containing bottoms fraction is separated from the product fraction and said gas oil containing bottoms fraction is reprocessed at a higher intensity than used ...

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Abstract

A catalytic cracking process includes more than one catalytic cracking step and integrates catalytic cracking steps with hydroprocessing in order to maximize olefins production, distillate quality and octane level of the cracked product. In the process, a hydrocarbon feed is hydroprocessed in a hydroprocessor (23) with thishydroprocessed hydrocarbon being passed to a first catalytic cracking zone (10) to form a first cracked product. This first cracked product is passed to a separator (17) in which hydrocarbon fractions including a gas oil-containing bottoms fraction are separated. This bottoms fraction is then passed to a second hydroprocessor (19) to form a second hydroprocessed hydrocarbon. This second hydroprocessed hydrocarbon is then passed to a second separator (20) to separate a hydroprocessed bottoms fraction and an unspent hydrogen fraction. The unspent hydrogen fraction is combined with the feed and the hydroprocessed bottoms fraction is passed to a second catalytic cracker (11) to form a second cracked product.

Description

[0001] public background field of invention [0002] The present invention relates to a staged catalytic cracking process comprising more than one catalytic cracking reaction step. In particular, the present invention relates to a staged catalytic cracking process combining at least one hydrotreating step before said catalytic cracking reaction step and at least one hydrotreating step between said catalytic cracking reaction step. Background of the invention [0003] In order to improve the total output of gasoline and the octane number of gasoline, a staged catalytic cracking reaction system has been introduced. However, recent environmental constraints have hit refiners hard. As a result, known staged catalytic cracking processes are not effective enough in meeting environmental constraints while maintaining high octane ratings in gasoline products. [0004] US5152883 discloses a fluidized catalytic cracking unit, which includes two serial catalytic cracking reaction ste...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G69/04
CPCC10G69/04
Inventor R·古普塔E·S·艾里斯
Owner EXXON RES & ENG CO
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