US4370219A
Expired / Lapsed
US
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Hydrocarbon conversion process employing essentially alumina-free zeolites
Assignee: Chevron USA Inc
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Filing: 1981-03-16
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Granted: 1983-01-25
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Expires: 2001-03-16
Abstract
Abstract A process for converting a hydrocarbonaceous feedstock in which a catalytically hydroprocessed or a catalytically reformed feedstock is contacted under cracking conditions with an essentially alumina-free intermediate pore size zeolitic catalyst and immediately thereafter with a second essentially alumina-free intermediate pore size zeolitic catalyst under cracking conditions less severe than the first contacting conditions. The less severe conditions in the second contacting stage are preferably obtained by employing a lower temperature, although use of a less active catalyst to attain this end is a possibility. A crystalline chromia silicate having a mole ratio of oxides SiO 2 :Cr 2 O 3 of greater than about 20 to 1 and an intermediate pore size crystalline silicate of the ZSM-5 type having a mole ratio of oxides SiO 2 :Al 2 O 3 of greater than about 200 are the preferred catalysts.
Inventors
- 👤 Stephen J. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:58
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/046; B01J29/06; B01J29/40; C; C10; C10G; C10G11/00; C10G11/02; C10G11/04; C10G11/05; C10G69/00; C10G69/02; C10G69/04; C10G69/08
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
193 words
A process for converting a hydrocarbonaceous feedstock by subjecting the feedstock to catalytic reactions in three zones, the process comprising the steps of catalytically hydroprocessing the feedstock in a first reaction zone, contacting the product of the first zone in a second reaction zone under cracking conditions including a temperature of from about 650°-1100° F., a pressure of from about 0-2000 psig and an LHSV of from about 0.1-10 with a first catalyst comprising an essentially alumina-free intermediate pore size zeolite and, immediately thereafter, contacting the product of the second reaction zone in a third reaction zone with a second catalyst comprising an essentially alumina-free intermediate pore size zeolite under cracking conditions less severe than the cracking conditions in the second reaction zone including a temperature of from about 400°-700° F., a pressure of from about 0-2000 psig and an LHSV of from about 0.1-10 wherein the less severe cracking conditions are obtained by maintaining a lower temperature in the third reaction zone than in the second reaction zone so as to favor polymerization in the third zone of olefins formed in the second zone whereby selectivity to C 5 + is increased.
Claim 2
Dependent Claim
193 words
A process for converting a hydrocarbonaceous feedstock by subjecting the feedstock to catalytic reactions in three zones, the process comprising the steps of catalytically hydroprocessing the feedstock in a first reaction zone, contacting the product of the first zone in a second reaction zone under cracking conditions including a temperature of from about 650°-1100° F., a pressure of from about 0-2000 psig and an LHSV of from about 0.1-10 with a first catalyst comprising an essentially alumina-free intermediate pore size zeolite and, immediately thereafter, contacting the product of the second reaction zone in a third reaction zone with a second catalyst comprising an essentially alumina-free intermediate pore size zeolite under cracking conditions less severe than the cracking conditions in the second reaction zone including a temperature of from about 400°-700° F., a pressure of from about 0-2000 psig and an LHSV of from about 0.1-10 wherein the less severe cracking conditions are obtained by maintaining a lower temperature in the third reaction zone than in the second reaction zone so as to favor polymerization in the third zone of olefins formed in the second zone whereby selectivity to C 5 + is increased.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the second and third reaction zones are contained within different reactors.
Claim 4
Dependent Claim
29 words
The process of claim 1, wherein the first reaction zone is contained in a first reactor and the second and third reaction zones are contained in a second reactor.
Claim 5
Dependent Claim
34 words
The process of claim 1 wherein the first and second catalysts comprise a ZSM-5 type crystalline silicate having a mole ratio of oxides SiO 2 :Al 2 O 3 of greater than about 200.
Claim 6
Dependent Claim
33 words
The process of claim 1 wherein the first and second catalysts comprise a ZSM-5 type crystalline silicate having a mole ratio of oxides SiO 2 :Al 2 O 3 greater than about 500.
Claim 7
Dependent Claim
33 words
The process of claim 1 wherein the first and second catalysts comprise a ZSM-5 type crystalline silicate having a mole ratio of oxides SiO 2 :Al 2 O 3 greater than about 1000.
Claim 8
Dependent Claim
43 words
The process of claim 1 wherein the first and second catalysts comprise a crystalline chromia silicate having a mole ratio of oxides SiO 2 :Cr 2 O 3 greater than about 20 and having the random powder X-ray diffraction lines of Table 2.
Claim 9
Dependent Claim
18 words
The process of claim 1, wherein the first and second catalysts have the same composition and pore structure.
Claim 10
Dependent Claim
43 words
The process of claim 8 wherein the first and second catalysts comprise a crystalline chromia silicate having a mole ratio of oxides SiO 2 :Cr 2 O 3 greater than about 20 and having the random powder X-ray diffraction lines of Table 2.
Claim 11
Dependent Claim
22 words
The process of claim 8 wherein the intermediate pore size zeolite has the characteristic random powder X-ray diffraction lines of Table A.
Claim 12
Dependent Claim
22 words
The process of claim 8 wherein the intermediate pore size zeolite has the characteristic random powder X-ray diffraction lines of Table C.
Claim 13
Dependent Claim
33 words
The process of claim 8 wherein the first and second catalysts comprise a ZSM-5 type crystalline silicate having a mole ratio of oxides SiO 2 :Al 2 O 3 greater than about 200.
Claim 14
Dependent Claim
193 words
A process for converting a hydrocarbonaceous feedstock by subjecting the feedstock to catalytic reactions in three zones, the process comprising the steps of catalytically reforming the feedstock in a first reaction zone, contacting the product of the first zone in a second reaction zone under cracking conditions including a temperature of from about 650°-1100° F., a pressure of from about 0-2000 psig and an LHSV of from about 0.1-10 with a first catalyst comprising an essentially alumina-free intermediate pore size zeolite and, immediately thereafter, contacting the product of the second reaction zone in a third reaction zone with a second catalyst comprising an essentially alumina-free intermediate pore size zeolite under cracking conditions less severe than the cracking conditions in the second reaction zone including a temperature of from about 400°-700° F., a pressure of from about 0-2000 psig and an LHSV of from about 0.1-10 wherein the less severe cracking conditions are obtained by maintaining a lower temperature in the third reaction zone than in the second reaction zone so as to favor polymerization in the third zone of olefins formed in the second zone whereby selectivity to C 5 + is increased.
Claim 15
Dependent Claim
193 words
A process for converting a hydrocarbonaceous feedstock by subjecting the feedstock to catalytic reactions in three zones, the process comprising the steps of catalytically reforming the feedstock in a first reaction zone, contacting the product of the first zone in a second reaction zone under cracking conditions including a temperature of from about 650°-1100° F., a pressure of from about 0-2000 psig and an LHSV of from about 0.1-10 with a first catalyst comprising an essentially alumina-free intermediate pore size zeolite and, immediately thereafter, contacting the product of the second reaction zone in a third reaction zone with a second catalyst comprising an essentially alumina-free intermediate pore size zeolite under cracking conditions less severe than the cracking conditions in the second reaction zone including a temperature of from about 400°-700° F., a pressure of from about 0-2000 psig and an LHSV of from about 0.1-10 wherein the less severe cracking conditions are obtained by maintaining a lower temperature in the third reaction zone than in the second reaction zone so as to favor polymerization in the third zone of olefins formed in the second zone whereby selectivity to C 5 + is increased.
Claim 16
Dependent Claim
17 words
The process of claim 13 wherein the second and third reaction zones are contained within different reactors.
Claim 17
Dependent Claim
29 words
The process of claim 13 wherein the first reaction zone is contained in a first reactor and the second and third reaction zones are contained in a second reactor.
Claim 18
Dependent Claim
34 words
The process of claim 13 wherein the first and second catalysts comprise a ZSM-5 type crystalline silicate having a mole ratio of oxides SiO 2 :Al 2 O 3 of greater than about 200.
Claim 19
Dependent Claim
33 words
The process of claim 13 wherein the first and second catalysts comprise a ZSM-5 type crystalline silicate having a mole ratio of oxides SiO 2 :Al 2 O 3 greater than about 500.
Claim 20
Dependent Claim
33 words
The process of claim 13 wherein the first and second catalysts comprise a ZSM-5 type crystalline silicate having a mole ratio of oxides SiO 2 :Al 2 O 3 greater than about 1000.
Claim 21
Dependent Claim
43 words
The process of claim 13 wherein the first and second catalysts comprise a crystalline chromia silicate having a mole ratio of oxides SiO 2 :Cr 2 O 3 greater than about 20 and having the random powder X-ray diffraction lines of Table 2.
Claim 22
Dependent Claim
18 words
The process of claim 13, wherein the first and second catalyst have the same composition and pore structure.
Claim 23
Dependent Claim
43 words
The process of claim 20 wherein the first and second catalysts comprise a crystalline chromia silicate having a mole ratio of oxides SiO 2 :Cr 2 O 3 greater than about 20 and having the random powder X-ray diffraction lines of Table 2.
Claim 24
Dependent Claim
22 words
The process of claim 20 wherein the intermediate pore size zeolite has the characteristic random powder X-ray diffraction lines of Table A.
Claim 25
Dependent Claim
22 words
The process of claim 20 wherein the intermediate pore size zeolite has the characteristic random powder X-ray diffraction lines of Table C.
Claim 26
Dependent Claim
33 words
The process of claim 20 wherein the first and second catalysts comprise a ZSM-5 type crystalline silicate having a mole ratio of oxides SiO 2 :Al 2 O 3 greater than about 200.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-24 | 1986-07-26 | 1987-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-24 | 1990-07-26 | 1991-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-24 | 1994-07-26 | 1995-01-25 | $7700.00 | Window Closed / Lapsed |