CATALYTIC CRACKING METHOD

• US 3,658,693 A
• Filed: 12/11/1969
• Issued: 04/25/1972
• Est. Priority Date: 12/11/1969
• Status: Expired due to Term

• Current Assignee: George R. Hettick, Shelby D. Lawson
• Original Assignee: George R. Hettick, Shelby D. Lawson
• Inventors: Hettick, George R., Lawson, Shelby D.
• Primary Examiner(s): Levine, Herbert
• Application Number:
  US04/884,174
• Time in Patent Office: 866 Days
• Field of Search: 208/92,93
• US Class Current: 208/93
• CPC Class Codes: C09C 1/48 Carbon black
• CPC Class Codes: C10G 11/00 Catalytic cracking, in the absence of hydrogen, of hydrocarbon oils cracking in direct contact with molten metals or salts C10G9/34
• CPC Class Codes: C10G 57/005 with alkylation
• CPC Class Codes: C10G 7/00 Distillation of hydrocarbon oils

Abstract

A process for increased production of naphtha from crude stocks. The crude is fractionated to recover straight run naphtha, and bottom product is cracked to produce largely naphtha and lighter, with only minor by-products production of carbon black oil and coke.

Claims

2. A process according to claim 1 wherein said step (g) comprises:

contacting said third overhead stream from said step (d) in an absorber under absorption conditions, thereby substantially moving hydrogen and C1 through C2 hydrocarbons from said third overhead stream and leaving a deethanized light fraction, separating said deethanized light fraction into an overhead comprising a mixed C3 and C4 stream, and a thus purified bottoms stream comprising said second naphtha stream.

3. A process according to claim 2 further including recycling a portion of said purified naphtha stream as absorbent in said absorber.

4. A process according to claim 3 wherein said cracking step (c) is conducted at a temperature of from about 850* to about 1,000* F., and said combined naphtha product constitutes at least about 65 volume percent of said crude oil.

5. A process according to claim 4 wherein further said mixed C3 and C4 stream from said step (g) is treated by steps which comprise:

fractionating said mixed C3 and C4 stream into an overhead consisting essentially of a mixed C3 stream, and a bottoms consisting essentially of a mixed C4 stream, and further fractionating said mixed C3 stream into an essentially unsaturated C3 stream as overhead and an essentially saturated C3 stream as bottoms.

6. A process according to claim 5 wherein further said mixed C4 stream is treated by steps which comprise:

combining under HF alkylation conditions at least a portion of the components of said mixed C4 stream and thereby forming an alkylate, separating said alkylate from unreacted components and recovering said alkylate as a product.

7. A process according to claim 4 wherein further said mixed C3 and C4 stream from said step (g) is treated by steps which comprise:

feeding said mixed C3 and C4 stream to an HF alkylation zone as at least a portion of the feed thereto, feeding make-up n-C4 to said HF alkylation zone as a further portion of said feed thereto, combining under HF alkylation conditions at least a portion of the components of said feed to form alkylate, separating said alkylate from unreacted components and recovering said alkylate as a product.