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Ancillary cracking of paraffinic naphtha in conjuction with FCC unit operations

a technology of paraffinic naphtha and unit operations, which is applied in the direction of catalytic cracking, hydrocarbon oil treatment, catalyst regeneration/reactivation, etc., can solve the problems of adversely affecting the yield of the desired lighter hydrocarbon reaction products, and achieve the effect of efficient cracking

Inactive Publication Date: 2008-01-17
SAUDI ARABIAN OIL CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0019]The downflow reactor provides several advantages including the relative ease of separating the desired end products from other components.

Problems solved by technology

The introduction of other hydrocarbons into the feedstream of the secondary downflow reactor will adversely affect the yields of the desired lighter hydrocarbon reaction products.

Method used

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  • Ancillary cracking of paraffinic naphtha in conjuction with FCC unit operations
  • Ancillary cracking of paraffinic naphtha in conjuction with FCC unit operations
  • Ancillary cracking of paraffinic naphtha in conjuction with FCC unit operations

Examples

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examples

[0054]A bench scale pilot plant was used to determine the operating conditions for obtaining desired product yields from cracking a typical paraffinic naphtha feedstock. A pilot plant unit was used to represent the cracking conditions in the downflow reactor.

[0055]In the following examples, two catalyst systems are utilized to demonstrate the potential for cracking paraffinic naphtha to produce light olefin yields. One catalyst was a typical low rare earth, low hydrogen transfer USY zeolite catalyst that is commercially available. The second catalyst system was the same commercially available USY zeolite cracking catalyst blended with a shape selective ZSM-5 zeolite type cracking catalyst additive.

[0056]The following Table summarizes the effects of varying the cracking severity by changing the reactor temperatures in the pilot unit for both catalyst systems.

CatalystUSYUSY + ZSM-5Temperature° C.510550625510550625° F.9501022115795010221157Conversion wt. %293944314352Product Yields wt....

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Abstract

The production of light hydrocarbons consisting of ethylene, propylene, butylenes, and of gasoline is enhanced by introducing a virgin paraffinic naphtha feedstream derived from an external source into an ancillary downflow reactor that utilizes the same catalyst composition as an adjacent FCC unit for cracking the naphtha and withdrawing the desired lighter hydrocarbon reaction product stream from the downflow reactor and regenerating the catalyst in the same regeneration vessel that is used to regenerate the spent catalyst from the FCC unit. The efficiency of the recovery of the desired lighter olefinic hydrocarbons is maximized by limiting the feedstream to the downflow reactor to paraffinic naphtha that can be processed under relatively harsher conditions, while minimizing production of undesired by-products and reducing the formation of coke on the catalyst.

Description

FIELD OF THE INVENTION[0001]This invention relates to increasing the production of lighter hydrocarbons, such as ethylene, propylene and the butylenes, and gasoline in conjunction with the operation of a fluidized catalytic cracking process.BACKGROUND OF THE INVENTION[0002]Propylene is second in importance only to ethylene as a petrochemical raw material building block. Propylene has traditionally been obtained as a by-product from steam cracking to produce ethylene and from refinery fluidized catalytic cracking processes to produce gasoline. The projected growth in demand for propylene has started to exceed that of ethylene so that existing processes cannot satisfy the future propylene demand. To meet the expected market demand for propylene, a catalytic paraffinic naphtha cracking process can be utilized.[0003]The catalytic cracking of olefinic naphthas is well known and currently practiced in all types of FCC units processing a variety of feedstocks. Recycled cracked naphtha, ole...

Claims

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Application Information

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IPC IPC(8): C10G11/00
CPCC10G2400/02C10G11/182C10G2400/20C10G2300/1044C10G2300/4093C10G51/06C10G11/18B01J38/00C10G55/02
Inventor DEAN, CHRISTOPHER F.
Owner SAUDI ARABIAN OIL CO
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