US3886060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for catalytic cracking of residual oils
Assignee: Mobil Oil AS
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Filing: 1973-04-30
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Granted: 1975-05-27
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Expires: 1993-04-30
Abstract
Abstract A method and system for the fluid catalytic cracking of residual and lower boiling oil streams is described which relies upon the residual oil as a quench medium for limiting the conversion of a recycle oil product thereof in a riser conversion zone. The overall combination is enhanced by using a dual component cracking catalyst of large and small pore size. Other virgin feeds requiring limited conversion residence time may be used in the combination to obtain restricted conversion of the residual oil feed.
Inventors
- 👤 Hartley Owen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:06
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/26; C; C10; C10G; C10G11/00; C10G11/02; C10G11/04; C10G11/05; C10G11/14; C10G11/18
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
144 words
A METHOD FOR CONVERTING RESIDUAL OILS TO LOWER BOILING PRODUCTS WHICH COMPRISES, PASSING HOT CRYSTALLINE ZEOLITE CATALYST PARTICLES TO THE LOWER PORTION OF AN ELONGATED CONVERSION ZONE, PASSING A RECYCLE OIL PRODUCT OF RESIDUAL OIL CRACKING TO THE LOWER PORTION OF SAID CONVERSION ZONE UNDER CONDITIONS TO FORM A SUSPENSION WITH SAID CATALYST PARTICLES AT A TEMPERATURE OF AT LEAST 1,000*F., PASSING SAID SUSPENSION THROUGH SAID CONVERSION ZONE PROVIDING A RECYCLE OIL CHARGE RESIDENCE TIME IN THE RANGE OF 0.5 TO ABOUT 4 SECONDS, COMBINING A RESIDUAL OIL FEED WITH SAID SUSPENSION IN SAID CONVERSION ZONE IN AN AMOUNT SUFFICIENT TO QUENCH SAID RECYCLE OIL CONVERSION, PASSING THE SUSPENSION COMPRISING SAID RESIDUAL OIL FEED THROUGH SAID CONVERSION ZONE AT LOWER TEMPERATURE CRACKING CONDITIONS FOR AN ADDITIONAL HYDROCARBBON RESIDENCE TIME IN THE RANGE OF 0.5 TO 6 SECONDS, CYCLONICALLY SEPARATING SAID SUSPENSION INTO A HYDROCAR-
Claim 2
Independent Claim
144 words
A METHOD FOR CONVERTING RESIDUAL OILS TO LOWER BOILING PRODUCTS WHICH COMPRISES, PASSING HOT CRYSTALLINE ZEOLITE CATALYST PARTICLES TO THE LOWER PORTION OF AN ELONGATED CONVERSION ZONE, PASSING A RECYCLE OIL PRODUCT OF RESIDUAL OIL CRACKING TO THE LOWER PORTION OF SAID CONVERSION ZONE UNDER CONDITIONS TO FORM A SUSPENSION WITH SAID CATALYST PARTICLES AT A TEMPERATURE OF AT LEAST 1,000*F., PASSING SAID SUSPENSION THROUGH SAID CONVERSION ZONE PROVIDING A RECYCLE OIL CHARGE RESIDENCE TIME IN THE RANGE OF 0.5 TO ABOUT 4 SECONDS, COMBINING A RESIDUAL OIL FEED WITH SAID SUSPENSION IN SAID CONVERSION ZONE IN AN AMOUNT SUFFICIENT TO QUENCH SAID RECYCLE OIL CONVERSION, PASSING THE SUSPENSION COMPRISING SAID RESIDUAL OIL FEED THROUGH SAID CONVERSION ZONE AT LOWER TEMPERATURE CRACKING CONDITIONS FOR AN ADDITIONAL HYDROCARBBON RESIDENCE TIME IN THE RANGE OF 0.5 TO 6 SECONDS, CYCLONICALLY SEPARATING SAID SUSPENSION INTO A HYDROCAR-
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein the residual oil is introduced to said conversion zone at one or more spaced apart points.
Claim 4
Dependent Claim
41 words
The method of claim 1 wherein the catalyst comprises a dual cracking component comprising a large pore crystalline zeolite of the faujasite or mordenite type in combination with a smaller pore crystalline zeolite such as erionite, offertite and ZSM-5 type materials.
Claim 5
Dependent Claim
31 words
The method of claim 1 wherein the catalyst to oil ratio of the suspension in the region of residual oil injection is adjusted by adding additional hot catalyst to the suspension.
Claim 6
Dependent Claim
24 words
The method of claim 1 wherein the separated and recovered catalyst phase is combined with additional regenerated catalyst before stripping thereof of entrained hydrocarbons.
Claim 7
Dependent Claim
29 words
The method of claim 5 wherein the regenerated catalyst combined with the recovered catalyst phase is relied upon to convert a low severity reformate material to higher octane product.
Claim 8
Dependent Claim
26 words
The method of claim 1 wherein conversion of the residual oil is restricted not to exceed about 50 volume percent of 400*F. ASTM boiling point material.
Claim 9
Dependent Claim
59 words
The method of claim 1 wherein gaseous materials selected from the group comprising hydrogen, gaseous hydrocarbon products of more severe gas oil cracking operations, mixtures of paraffins and olefins and C1 to C3 hydrocarbons with or without hydrogen are combined with the residual hydrocarbon feed to suppress the effects of metal contaminants and coking characteristics of the heavy feed.
Claim 10
Dependent Claim
62 words
The method of claim 1 wherein a separate second conversion zone is provided for initially converting a heavy virgin naphtha or a light virgin gas oil with suspended catalyst to gasoline boiling product at a temperature of at least 1,000*F. before introducing residual oil to said second conversion zone as quench and conversion thereof by contact with the catalyst suspension provided therein.
Claim 11
Dependent Claim
86 words
The method of claim 9 wherein catalyst is separated from each conversion zone and stripped in a common stripping zone, the stripped catalyst is combined with freshly regenerated catalyst and passed upwards through a dispersed phase regeneration zone for discharge into the dIspersed catalyst phase above a dense fluid bed of catalyst being regenerated, said discharged catalyst is passed from said dispersed phase into said dense fluid bed of catalyst and dense bed regenerated catalyst is passed to the inlet of each of said conversion zones.
Claim 12
Dependent Claim
20 words
The method of claim 1 wherein conversion of the recycle oil feed is restricted not to exceed 50 volume percent.
Claim 13
Dependent Claim
20 words
The method of claim 1 wherein conversion of the residual oil feed is restricted to less than 45 volume percent.
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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) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |