Heavy naphtha conversion process
AssigneeTexaco Inc.
InventorsHsu-Hui Hsing, Roy E. Pratt
Life of this patent
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Abstract
A straight run naphtha is fractionated to yield on intermediate naphtha and the heaviest 10 vol % as heavy naphtha. The intermediate naphtha is catalytically reformed to yield reformed naphtha having a 90 vol % temperature (T90) of 310.degree. F. (155.degree. C.). The heavy naphtha is subjected to fluid catalytic cracking (FCC) to yield liquid fuel and lighter, including C.sub.4 olefins and a cracked naphtha having a research octane number suitable for gasoline blending.
Claims16
A process for catalytically cracking a heavy naphtha fraction derived from crude petroleum to yield a cracked naphtha and a C.sub.3 to C.sub.5 olefin fraction comprising:
- a. fractionating crude petroleum to produce at least two fractions comprising:
- i. a straight run naphtha fraction having a boiling range of about 90.degree. F. (32.2.degree. C.) to 430.degree. F. (221.degree. C.), and
- ii. a gas oil and vacuum gas oil fraction having a boiling range of about 650.degree. F. (343.degree. C.) to 1100.degree. F. (593.degree. C.);
- b. fractionating the straight run naphtha fraction to produce at least two fractions comprising:
- i. an intermediate naphtha fraction, and
- ii. a heavy naphtha fraction having an initial boiling point of about 250.degree. F. (121.degree. C.) or higher;
- c. vaporizing the heavy naphtha fraction to yield a lift gas;
- d. contacting fluid catalytic cracking catalyst with the lift gas in an initial portion of a vertically elongated riser reactor to produce a catalyst suspension;
- e. contacting the catalyst suspension with the gas oil and vacuum gas oil fraction at a riser reactor temperature of about 900.degree. F. (482.degree. C.) to 1200.degree. F. (649.degree. C.) to yield a liquid fuel and lighter fraction;
- f. fractionating the liquid fuel and lighter fraction to yield a C.sub.3 to C.sub.5 olefin fraction and cracked naphtha;
- g. catalytically reforming the intermediate naphtha fraction of step b.i. at catalytic reforming conditions to yield reformed naphtha characterized in having 90 vol % boiling at a temperature of 310.degree. F. (155.degree. C.) or lower.
A process for catalytically cracking a heavy naphtha fraction derived from crude petroleum to yield a cracked naphtha and a C.sub.3 to C.sub.5 olefin fraction comprising:
- a. fractionating crude petroleum to produce a straight run naphtha fraction having a boiling range of about 90.degree. F. (32.2.degree. C.) to 430.degree. F. (221.degree. C.);
- b. fractionating the straight run naphtha fraction to produce at least two fractions comprising:
- i. an intermediate naphtha fraction, and
- ii. a heavy naphtha fraction having an initial boiling point of about 250.degree. F. (121.degree. C.) or higher;
- c. contacting a fluidized cracking catalyst with the heavy naphtha fraction at a riser reactor temperature of about 900.degree. F. (482.degree. C.) to 1200.degree. F. (649.degree. C.) to yield a liquid fuel and lighter fraction;
- d. fractionating the liquid fuel and lighter fraction to yield a C.sub.3 to C.sub.5 olefin fraction and cracked naphtha;
- e. catalytically reforming the intermediate naphtha fraction of step b.i. at catalytic reforming conditions to yield reformed naphtha characterized in having 9 vol % boiling at a temperature of 310.degree. F. (155.degree. C.) or lower.
Dependencies are inferred from the claim text.