US3928174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination process for producing LPG and aromatic rich material from naphtha
Assignee: Mobil Oil AS
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Filing: 1975-01-02
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Granted: 1975-12-23
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Expires: 1995-01-02
Abstract
Abstract Processing of reformate product of catalytic reforming to produce significant yields of LPG and BTX as well as aromatic enriched reformate with a ZSM-5 type crystalline zeolite is described.
Inventors
- 👤 John C Bonacci
- 👤 Henry P Ireland
- 👤 Thomas R Stein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:45
CPC Classifications
C; C10; C10G; C10G59/00; C10G59/02
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
246 words
A METHOD FOR REDISTRIBUTING THE PARAFFIN-AROMATIC COMPONENTS OF A REFORMATE PRODUCT OF CATALYTIC REFORMING COMPRISING C5 AND HIGHER BOILING HYDROCARBONS WHICH COMPRISES, SEPARATING C5 AND LOWER BOILING COMPONENTS OF CATALYTIC REFORMING FROM C6 AND HIGHER BOILING MATERIALS IN A FIRST SEPARATION ZONE, SEPARATING THE C6 AND HIGHER BOILING MATERIAL IN A SECOND SEPARATION ZONE INTO A FIRST FRACTION COMPRISING SOME C7 COMPONENTS AND LOWER BOILING PARAFFIN AND AROMATIC COMPONENTS AND A SECOND FRACTION COMPRISING C7 AND HIGHER BOILING PARAFFINS AND AROMATIC COMPONENTS, PASSING SAID FIRST FRACTION IN CONTACT WITH A FIRST CRYSTALLINE ZEOLITE CATALYST HAVING PROPERTIES FOR CRACKING PARAFFINS TO FORM LPG MATERIALS AND REDISTRIBUTE THE RATIO BETWEEN BENZENE AND TOLUENE COMPONENTS IN THE FEED, SEPARATING PRODUCT MATERIAL OF SAID FIRST CRYSTALLINE ZEOLITE CONVERSION OPERATION INTO GASEOUS MATERIAL COMPRISING C2 AND LOWER BOILING MATERIAL FROM MATERIAL COMPRISING C3 AND HIGHER BOILING COMPONENTS, PASSING THE C3 AND HIGHER BOILING MATERIAL TO SAID FIRST SEPARATION ZONE, PASSING A PORTION OF SAID SECOND FRACTION COMPRISING C7 AND HIGHER BOILING PARAFFINS AND AROMATICS IN CONTACT WITH A SEPARATE SECOND MASS OF CRYSTALLINE ZEOLITE CATALYST HAVING PROPERTIES FOR CRACKING SAID PARAFFINS AND DISPROPORTIONATING AROMATIC TO FORM A MIXTURE OF BENZENE, TOLUENE AND XYLENE; SEPARATING THE PRODUCT OF SAID SECOND ZEOLITE CATALYST CONVERSION OPERATION TO RECOVER A HYROGEN RICH STREAM, A STREAM RICH IN BENZENE, TOLUNE AND XYLENE AROMATICS AND AN INTERMEDIATE PRODUCT STREAM LOWER BOILING THAN SAID AROMATIC RICH STREAM, AND RECYCLIN SAID INTERMEDIATE PRODUCT STREAM TO SAID FIRST SEPARATION ZONE.
Claim 2
Independent Claim
246 words
A METHOD FOR REDISTRIBUTING THE PARAFFIN-AROMATIC COMPONENTS OF A REFORMATE PRODUCT OF CATALYTIC REFORMING COMPRISING C5 AND HIGHER BOILING HYDROCARBONS WHICH COMPRISES, SEPARATING C5 AND LOWER BOILING COMPONENTS OF CATALYTIC REFORMING FROM C6 AND HIGHER BOILING MATERIALS IN A FIRST SEPARATION ZONE, SEPARATING THE C6 AND HIGHER BOILING MATERIAL IN A SECOND SEPARATION ZONE INTO A FIRST FRACTION COMPRISING SOME C7 COMPONENTS AND LOWER BOILING PARAFFIN AND AROMATIC COMPONENTS AND A SECOND FRACTION COMPRISING C7 AND HIGHER BOILING PARAFFINS AND AROMATIC COMPONENTS, PASSING SAID FIRST FRACTION IN CONTACT WITH A FIRST CRYSTALLINE ZEOLITE CATALYST HAVING PROPERTIES FOR CRACKING PARAFFINS TO FORM LPG MATERIALS AND REDISTRIBUTE THE RATIO BETWEEN BENZENE AND TOLUENE COMPONENTS IN THE FEED, SEPARATING PRODUCT MATERIAL OF SAID FIRST CRYSTALLINE ZEOLITE CONVERSION OPERATION INTO GASEOUS MATERIAL COMPRISING C2 AND LOWER BOILING MATERIAL FROM MATERIAL COMPRISING C3 AND HIGHER BOILING COMPONENTS, PASSING THE C3 AND HIGHER BOILING MATERIAL TO SAID FIRST SEPARATION ZONE, PASSING A PORTION OF SAID SECOND FRACTION COMPRISING C7 AND HIGHER BOILING PARAFFINS AND AROMATICS IN CONTACT WITH A SEPARATE SECOND MASS OF CRYSTALLINE ZEOLITE CATALYST HAVING PROPERTIES FOR CRACKING SAID PARAFFINS AND DISPROPORTIONATING AROMATIC TO FORM A MIXTURE OF BENZENE, TOLUENE AND XYLENE; SEPARATING THE PRODUCT OF SAID SECOND ZEOLITE CATALYST CONVERSION OPERATION TO RECOVER A HYROGEN RICH STREAM, A STREAM RICH IN BENZENE, TOLUNE AND XYLENE AROMATICS AND AN INTERMEDIATE PRODUCT STREAM LOWER BOILING THAN SAID AROMATIC RICH STREAM, AND RECYCLIN SAID INTERMEDIATE PRODUCT STREAM TO SAID FIRST SEPARATION ZONE.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein hydrogen rich gas is passed to each zeolite catalyst conversion zone.
Claim 4
Dependent Claim
20 words
The method of claim 1 wherein a C6 reformate fraction enriched in toluene is withdrawn from said first separation zone.
Claim 5
Dependent Claim
17 words
The method of claim 1 wherein a toluene-xylene rich fraction is withdrawn from said second separation zone.
Claim 6
Dependent Claim
28 words
The method of claim 1 wherein a hydrogen rich gas is separated from the product of each zeolite catalyst conversion operation and is recycled to the catalyst operation.
Claim 7
Dependent Claim
25 words
The method of claim 1 wherein LPG product material of the process combination is concentrated in the overhead product withdrawn from the first separation zone.
Claim 8
Dependent Claim
25 words
The method of claim 1 wherein the temperatures relied upon in the first zeolite catalyst conversion zone are within the range of 500*F. to 800*F.
Claim 9
Dependent Claim
32 words
The method of claim 1 wherein the temperatures and operating conditions relied upon in the other zeolite catalyst conversion zone are more severe than those used in the first catalyst conversion operation.
Claim 10
Dependent Claim
30 words
The method of claim 1 wherein the formation of a benzene, toluene, xylene rich mixture is particularly promoted by the operating conditions relied upon in the second zeolite catalyst operation.
Claim 11
Dependent Claim
16 words
The method of claim 1 wherein the zeolite catalyst is preferably a ZSM-5 type crystalline zeolite.
Claim 12
Dependent Claim
189 words
A process of upgrading petroleum reformate to an aromatics concentrate comprising benzene, toluene and xylene (BTX), liquifiable petroleum gas (LPG) comprising C3 and C4 components, and high octane gasoline comprising: splitting at least a C6 portion of said reformaTe into C7 and C7 fractions having minimum and maximum boiling points respectively of about 200* to 240*F; contacting said C7 fraction with a crystalline aluminosilicate zeolite having a silica to alumina ratio of at least 12 and a constraint index of 1 to 12 in a first conversion zone; converting said C7 fraction in said first conversion zone at at least about 500*F. to a product comprising C4 gas and a substantially aromatic liquid concentrate; contacting said C7 fraction with a crystalline aluminosilicate zeolite, having the ability to crack substantially only paraffinic components of said C7 fraction to C4 gas, in a second conversion zone; converting said C7 fraction in said second conversion zone at at least about 700*F. to a product comprising C4 gas and an aromatics enriched liquid product; and recovering LPG from said C4 gas, said aromatics concentrate, and high octane gasoline comprising said aromatics enriched liquid.
Claim 13
Dependent Claim
189 words
A process of upgrading petroleum reformate to an aromatics concentrate comprising benzene, toluene and xylene (BTX), liquifiable petroleum gas (LPG) comprising C3 and C4 components, and high octane gasoline comprising: splitting at least a C6 portion of said reformaTe into C7 and C7 fractions having minimum and maximum boiling points respectively of about 200* to 240*F; contacting said C7 fraction with a crystalline aluminosilicate zeolite having a silica to alumina ratio of at least 12 and a constraint index of 1 to 12 in a first conversion zone; converting said C7 fraction in said first conversion zone at at least about 500*F. to a product comprising C4 gas and a substantially aromatic liquid concentrate; contacting said C7 fraction with a crystalline aluminosilicate zeolite, having the ability to crack substantially only paraffinic components of said C7 fraction to C4 gas, in a second conversion zone; converting said C7 fraction in said second conversion zone at at least about 700*F. to a product comprising C4 gas and an aromatics enriched liquid product; and recovering LPG from said C4 gas, said aromatics concentrate, and high octane gasoline comprising said aromatics enriched liquid.
Claim 14
Dependent Claim
22 words
A process as claimed in claim 11 including admixing a portion of said aromatics concentrate with said reformate prior to said splitting.
Claim 15
Dependent Claim
21 words
A process as claimed in claim 11 including deleting a C5 fraction from said reformate and splitting the remaining C6 fraction.
Claim 16
Dependent Claim
17 words
A process as claimed in claim 11 including separating C3 and C4 components from said C4 gas.
Claim 17
Dependent Claim
18 words
A process as claimed in claim 11 including splitting a portion of the C6 portion of said reformate.
Claim 18
Dependent Claim
20 words
A process as claimed in claim 11, including admixing said aromatics enriched liquid with said reformate prior to said splitting.
Claim 19
Dependent Claim
32 words
A process as claimed in claim 11 including admixing said aromatics enriched liquid, a portion of said aromatics concentrate and said reformate; and splitting said admixture into said C7 and C7 fractions.
Claim 20
Dependent Claim
18 words
A process as claimed in claim 11 including utilizing the same zeolite respectively in both of said conversions.
Claim 21
Dependent Claim
13 words
A process as claimed in claim 18 wherein said zeolite is a ZSM-5.
Claim 22
Dependent Claim
74 words
A process as claimed in claim 11 wherein said C7 conversion is carried out at about 500* to 800*F., about 200 to 1000 psig, about 1 to 4 LHSV and about 2 to 10 to 1 hydrogen to hydrocarbon ratio; and wherein said C7 conversion is carried out at about 750* to 900*F., about 200 to 1000 psig, about 0.5 to 2 LHSV and about 3 to 20 to 1 hydrogen to hydrocarbon ratio.
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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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |