Conversion of crude oil fractions to olefins
AssigneeThe Dow Chemical Company
InventorsMilton Silas Wing, Billy Duane Head
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Abstract
A catalytic process for hydrocracking crude oil fractions into a C.sub.2 -C.sub.5 alkane mixture having a normal paraffin to isoparaffin molar ratio greater than about 3:1 and thermally cracking this mixture to recover ethylene and propylene. The hydrocracking catalysts used are made from a Group VIII metal, a Group VI B metal or mixtures thereof, with a halogen supported on a silica-alumina support or a natural or synthetic faujasite. The catalysts must be sulfided prior to or during use.
Claims9
A process for the production of an ethylene-propylene product which comprises:
- A. hydrocracking a crude oil fraction boiling in the range from 200.degree. to 1000.degree.F. by contacting a mixture of said fraction and hydrogen with a highly active sulfided hydrocracking catalyst under a pressure greater than about 400 psig wherein
- 1. the molar ratio of hydrogen to said fraction is in the range from about 4:1 to about 50:1;
- 2. the temperature range is from about 300.degree. to about 565.degree.C.;
- and
- 3. the residence time is from about one to about 180 seconds;
- 4. the catalyst comprises of Group VIII metal, a Group VI B metal, or mixtures thereof and a halogen supported on a catalyst support of silica-alumina mixtures, or a natural or synthetic faujasite;
- 5. conditions (1) - (3) are selected so as to produce a C.sub.2 - C.sub.5 product in a yield of 91- 95% and to achieve a normal paraffin to isoparaffin molar ratio greater than about 3:1 in the C.sub.2 - C.sub.5 portion of the hydrocracked product;
- B. separating the hydrocracked product of step (A) to recover a C.sub.2 - C.sub.5 alkane product;
- C. thermally cracking the C.sub.2 - C.sub.5 product and
- D. recovering ethylene and propylene as co-products.
In a process for the production of an ethylene-propylene product wherein a crude oil fraction boiling in the range from 200.degree. to 1000.degree.F. is hydrocracked with a highly active sulfided hydrocracking catalyst under a pressure greater than about 400 psig and the hydrocracked product is thermally cracked to yield an ethylene-propylene product, the improvement which comprises contacting the crude oil fraction with hydrogen in a molar ratio of hydrogen to said fraction in the range from about 4:1 to 50:1 at a temperature range from about 300.degree. to about 565.degree.C. with a residence time ranging from about 1 to about 180 seconds so as to produce a C.sub.2 - C.sub.5 product in a yield of 91- 95% and to achieve a normal paraffin to isoparaffin molar ratio greater than about 3:1 in the C.sub.2 - C.sub.5 portion of the hydrocracked product.
A process for the production of an ethylene-propylene product which comprises:
- A. hydrocracking a crude oil fraction boiling in the range from 200.degree. to 1000.degree.F by contacting a mixture of said fraction and hydrogen with a highly active sulfided hydrocracking catalyst under a pressure greater than about 400 psig wherein
- 1. the molar ratio of hydrogen to said fraction is in the range from about 4:1 to about 50:1;
- 2. the temperature range is from about 300.degree. to about 565.degree.C.;
- and
- 3. the residence time is from about one to about 180 seconds;
- 4. the catalyst comprises a Group VIII metal, a Group VI B metal, or mixtures thereof supported on a catalyst support of silica-alumina mixtures, or a natural or synthetic faujasite;
- 5. conditions (1) - (3) are selected so as to produce a C.sub.2 - C.sub.5 product in a yield of 91-95% and to achieve a normal paraffin to isoparaffin molar ratio greater than about 3:1 in the C.sub.2 - C.sub.5 portion of the hydrocracked product;
- B. separating the hydrocracked product of step (A) to recover a C.sub.2 - C.sub.5 alkane product;
- C. thermally cracking the C.sub.2 - C.sub.5 product and
- D. recovering ethylene and propylene as co-products.
Dependencies are inferred from the claim text.