US3894932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conversion of hydrocarbons with {37 y{38 {0 faujasite-type catalysts
Assignee: Mobil Oil AS
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Filing: 1973-11-19
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Granted: 1975-07-15
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Expires: 1993-11-19
Abstract
Abstract A single riser fluid catalytic cracking operation for converting a gas oil feed material and a gaseous fraction rich in C3-C4 hydrocarbons to form aromatics and isobutane is described. Conversion of the C3-C4 rich fraction is accomplished at a high temperature in an initial annular portion of the riser reactor before charging a gas oil feed to the suspension formed in the annular section. C3-C4 rich hydrocarbon streams may be converted at a lower temperature in a downstream portion of the riser.
Inventors
- 👤 Hartley Owen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:07
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/14; C10G11/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
145 words
A METHOD FOR CONVERTING HYDROCARBONS WITH FAUJASITE CONVERSION CATALYST WHICH COMPRISES, PASSING AN UPFLOWING SUSPENSION OF HOT REGENERATED FAUJASITE CONVERSION CATALYST IN A C3-C4 GASEOUS HYDROCARBON FRACTION AT A TEMPERATURE OF ABOUT 1250*F. THROUGH A LOWER ANNULAR PORTION OF A RISER CONVERSION ZONE FOR A RESIDENCE TIME IN THE RANGE OF 0.1 TO 2 SECONDS, INTRODUCING A HIGHER BOILING HYDROCARBON FRACTION OF AT LEAST GAS OIL BOILING RANGE INTO SAID UPFLOWING SUSPENSION DOWNSTREAM OF SAID ANNULAR ZONE AT ONE OR MORE SPACED APART DOWNSTREAM INTERVALS AND CONVERTING THE INTRODUCED HIGHER BOILING FRACTION AT A TEMPERATURE IN THE RANGE OF 900*F. TO 1000*F. AT A HYDROCARBON RESIDENCE TIME UP TO ABOUT 10 SECONDS TO A PRODUCT RICH IN AROMATICS, SEPARATING THE SUSPENSION FOLLOWING TRAVERSE OF SAID RISER CONVERSION ZONE INTO A HYDROCARBON PHASE AND A CATALYST PHASE, AND SEQUENTIALLY STRIPPING AND REGENERATING SAID SEPARATED CATALYST PHASE.
Claim 2
Independent Claim
145 words
A METHOD FOR CONVERTING HYDROCARBONS WITH FAUJASITE CONVERSION CATALYST WHICH COMPRISES, PASSING AN UPFLOWING SUSPENSION OF HOT REGENERATED FAUJASITE CONVERSION CATALYST IN A C3-C4 GASEOUS HYDROCARBON FRACTION AT A TEMPERATURE OF ABOUT 1250*F. THROUGH A LOWER ANNULAR PORTION OF A RISER CONVERSION ZONE FOR A RESIDENCE TIME IN THE RANGE OF 0.1 TO 2 SECONDS, INTRODUCING A HIGHER BOILING HYDROCARBON FRACTION OF AT LEAST GAS OIL BOILING RANGE INTO SAID UPFLOWING SUSPENSION DOWNSTREAM OF SAID ANNULAR ZONE AT ONE OR MORE SPACED APART DOWNSTREAM INTERVALS AND CONVERTING THE INTRODUCED HIGHER BOILING FRACTION AT A TEMPERATURE IN THE RANGE OF 900*F. TO 1000*F. AT A HYDROCARBON RESIDENCE TIME UP TO ABOUT 10 SECONDS TO A PRODUCT RICH IN AROMATICS, SEPARATING THE SUSPENSION FOLLOWING TRAVERSE OF SAID RISER CONVERSION ZONE INTO A HYDROCARBON PHASE AND A CATALYST PHASE, AND SEQUENTIALLY STRIPPING AND REGENERATING SAID SEPARATED CATALYST PHASE.
Claim 3
Dependent Claim
50 words
The method of claim 1 wherein the suspension after traversing the riser conversion zone is cyclonically separated into a hydrocarbon phase and a catalyst phase, the catalyst phase is stripped with stripping gas and a portion of the stripped catalyst is recycled to the inlet of the riser conversion zone.
Claim 4
Independent Claim
107 words
A method for converting gas oils and low boiling C3-C4 hydrocarbons with a faujasite conversion catalyst which comprises, passing a suspension of faujasite cracking catalyst suspended in a hydrocarbon feed material of at least gas oil boiling range at an initial temperature of at least 1000*F. upwardly through a riser conversion zone under conditions to provide a hydrocarbon residence time up to about 10 seconds, introducing hydrocarbons rich in C3 and C4 hydrocarbons into said suspension to obtain conversion thereof to aromatics and isobutane, separating the suspension into a hydrocarbon phase and a catalyst phase, recovering the hydrocarbon phase, and stripping the separated catalyst beFore regeneration thereof.
Claim 5
Independent Claim
107 words
A method for converting gas oils and low boiling C3-C4 hydrocarbons with a faujasite conversion catalyst which comprises, passing a suspension of faujasite cracking catalyst suspended in a hydrocarbon feed material of at least gas oil boiling range at an initial temperature of at least 1000*F. upwardly through a riser conversion zone under conditions to provide a hydrocarbon residence time up to about 10 seconds, introducing hydrocarbons rich in C3 and C4 hydrocarbons into said suspension to obtain conversion thereof to aromatics and isobutane, separating the suspension into a hydrocarbon phase and a catalyst phase, recovering the hydrocarbon phase, and stripping the separated catalyst beFore regeneration thereof.
Claim 6
Dependent Claim
106 words
In a riser hydrocarbon conversion operation the improvement which comprises, passing a suspension comprising a gas oil high boiling hydrocarbon fraction admixed with faujasite catalyst at a temperature of at least 950*F. upwardly through a conversion zone, adding the high boiling fraction incrementally to the upflowing suspension, introducing a hydrocarbon fraction rich in C3 and C4 hydrocarbons into a downstream portion of said suspension in said riser conversion zone maintained under conditions to produce a product rich in isobutane, separating the suspension upon discharge from the conversion zone into a hydrocarbon phase and a catalyst phase, recovering the hydrocarbon phase, recovering and stripping the catalyst phase.
Claim 7
Dependent Claim
106 words
In a riser hydrocarbon conversion operation the improvement which comprises, passing a suspension comprising a gas oil high boiling hydrocarbon fraction admixed with faujasite catalyst at a temperature of at least 950*F. upwardly through a conversion zone, adding the high boiling fraction incrementally to the upflowing suspension, introducing a hydrocarbon fraction rich in C3 and C4 hydrocarbons into a downstream portion of said suspension in said riser conversion zone maintained under conditions to produce a product rich in isobutane, separating the suspension upon discharge from the conversion zone into a hydrocarbon phase and a catalyst phase, recovering the hydrocarbon phase, recovering and stripping the catalyst phase.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |