Patent US1332879A successfully refreshed from Google Patents.
Patent US4605488A successfully refreshed from Google Patents.
US4605488A
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US
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Catalytic dewaxing of light and heavy oils in dual parallel reactors
Assignee: Mobil Oil AS
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Filing: 1985-05-13
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Granted: 1986-08-12
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Expires: 2005-05-13
Abstract
Abstract Relatively heavy and relatively light lube chargestocks are dewaxed in two parallel, separate reactors. The reactor used for dewaxing the relatively light chargestock contains a crystallize zeolite having pore openings defined by: (1) a ratio of sorption of n-hexane to o-xylene, on a volume percent basis, of greater than 3, which sorption is determined at a P/Po of 0.1 and at a temperature of 50 DEG C. for n-hexane and 80 DEG C. for o-xylene and (2) by the ability of selectively cracking 3-methylpentane (3MP) in preference to the doubly branched 2,3-dimethylbutane (DMB) at 1000 DEG F. and 1 atmosphere pressure from a 1/1/1 weight ratio mixture of n-hexane/3-methyl-pentane/2,3-dimethylbutane, with the ratio of rate constants k3MP/kDMB determined at a temperature of 1000 DEG F. being in excess of about 2, e.g., natural and synthetic ferrierite, ZSM-22, ZSM-23, ZSM-35 and mixtures thereof. The reactor used for dewaxing the relatively heavy chargestock contains a crystalline aluminosilicate zeolite having pore openings defined by: (1) a ratio of sorption of n-hexane to o-xylene, on a volume percent basis, or less than 3, which sorption is determined at a P/Po of 0.1 and at a temperature of 50 DEG C. for n-hexane and 80 DEG C. for o-xylene, (2) the abiilty of selectively cracking 3-methylpentane (3MP) in preference to the doubly branched 2,3-dimethylbutane (DMB) at 1000 DEG F. and 1 atmosphere pressure from a 1/1/1 weight ratio mixture of n-hexane/3-methyl-pentane/2,3-dimethylbutane, with the ratio of rate constants k3MP/KDMB determined at a temperature of 1000 DEG F. being less than about 2, and (3) a Constraint Index value of greater than about 1, e.g., ZSM-5, ZSM-11, ZSM-5/ZSM-11 intermediate and mixtures thereof.
Inventors
- 👤 Arthur W. Chester
- 👤 William E. Garwood
- 👤 James C. Vartuli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:24
CPC Classifications
C; C10; C10G; C10G65/00; C10G45/00; C10G45/58; C10G45/60; C10G45/64; C10G65/14; C10G65/16
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
353 words
An integrated process for catalytically dewaxing a relatively light petroleum chargestock, characterized by a 50% boiling point of less than about 850° F. and a kinematic viscosity at 100° C. of less than about 9 centistokes, and a relatively heavy petroleum chargestock, characterized by a 50% boiling point of greater than about 850° F. and kinematic viscosity at 100° C. of greater than about 9 centistokes comprising: contacting the relatively light petroleum chargestock in a first dewaxing reactor with a dewaxing catalyst of a crystalline zeolite having pore openings defined by: (1) a ratio of sorption of n-hexane to o-xylene, on a volume percent basis, of greater than about 3, which sorption is determined at a P/P o of 0.1 and at a temperature of 50° C. for n-hexane and 80° C. for o-xylene and (2) by the ability of selectively cracking 3-methylpentane (3MP) in preference to the doubly branched 2,3-dimethylbutane (DMB) at 1000° F. and 1 atmosphere pressure from a 1/1/1 weight ratio mixture of n-hexane/3-methyl-pentane/2,3-dimethylbutane, with the ratio of rate constants k 3MP /k DMB determined at a temperature of 1000° F. being in excess of about 2 to produce a catalytically dewaxed light stock, contacting the relatively heavy petroleum chargestock in a second dewaxing reactor with a dewaxing catalyst of a crystalline zeolite having pore openings defined by: (1) a ratio of sorption of n-hexane to o-xylene, on a volume percent basis, of less than about 3, which sorption is determined at a P/P o of 0.1 and at a temperature of 50° C. for n-hexane and 80° C. for o-xylene, (2) by the ability of selectively cracking 3-methylpentane (3MP) in preference to the doubly branched 2,3-dimethylbutane (DMB) at 1000° F. and 1 atmosphere pressure from a 1/1/1 weight ratio mixture of n-hexane/3-methyl-pentane/2,3-dimethylbutane, with the ratio of rate constants k 3MP /k DMB determined at a temperature of 1000° F. being less than about 2, and (3) a Constraint Index value of greater than about 1, to produce a catalytically dewaxed heavy stock, and subsequently hydrotreating the effluent from said first and second dewaxing reactors in a downstream hydrotreating reactor.
Claim 2
Dependent Claim
353 words
An integrated process for catalytically dewaxing a relatively light petroleum chargestock, characterized by a 50% boiling point of less than about 850° F. and a kinematic viscosity at 100° C. of less than about 9 centistokes, and a relatively heavy petroleum chargestock, characterized by a 50% boiling point of greater than about 850° F. and kinematic viscosity at 100° C. of greater than about 9 centistokes comprising: contacting the relatively light petroleum chargestock in a first dewaxing reactor with a dewaxing catalyst of a crystalline zeolite having pore openings defined by: (1) a ratio of sorption of n-hexane to o-xylene, on a volume percent basis, of greater than about 3, which sorption is determined at a P/P o of 0.1 and at a temperature of 50° C. for n-hexane and 80° C. for o-xylene and (2) by the ability of selectively cracking 3-methylpentane (3MP) in preference to the doubly branched 2,3-dimethylbutane (DMB) at 1000° F. and 1 atmosphere pressure from a 1/1/1 weight ratio mixture of n-hexane/3-methyl-pentane/2,3-dimethylbutane, with the ratio of rate constants k 3MP /k DMB determined at a temperature of 1000° F. being in excess of about 2 to produce a catalytically dewaxed light stock, contacting the relatively heavy petroleum chargestock in a second dewaxing reactor with a dewaxing catalyst of a crystalline zeolite having pore openings defined by: (1) a ratio of sorption of n-hexane to o-xylene, on a volume percent basis, of less than about 3, which sorption is determined at a P/P o of 0.1 and at a temperature of 50° C. for n-hexane and 80° C. for o-xylene, (2) by the ability of selectively cracking 3-methylpentane (3MP) in preference to the doubly branched 2,3-dimethylbutane (DMB) at 1000° F. and 1 atmosphere pressure from a 1/1/1 weight ratio mixture of n-hexane/3-methyl-pentane/2,3-dimethylbutane, with the ratio of rate constants k 3MP /k DMB determined at a temperature of 1000° F. being less than about 2, and (3) a Constraint Index value of greater than about 1, to produce a catalytically dewaxed heavy stock, and subsequently hydrotreating the effluent from said first and second dewaxing reactors in a downstream hydrotreating reactor.
Claim 3
Dependent Claim
30 words
The process of claim 1 wherein the zeolite in the first dewaxing reactor is selected from the group consisting of natural and synthetic ferrierites, ZSM-22, ZSM-23, ZSM-35 and mixtures thereof.
Claim 4
Dependent Claim
27 words
The process of claim 1 wherein the zeolite in the second dewaxing reactor is selected from the group consisting of ZSM-5, ZSM-11, ZSM-5/ZSM-11 intermediate and mixtures thereof.
Claim 5
Dependent Claim
29 words
The process of claim 1 wherein both dewaxing reactors operate simultaneously, and wherein the catalytically dewaxed light and heavy stocks are comingled and continuously charged to the hydrotreating reactor.
Claim 6
Dependent Claim
16 words
The process of claim 1 wherein only one dewaxing reactor is in service at any time.
Claim 7
Dependent Claim
47 words
The process of claim 1 wherein the dewaxing reactors operate at conditions including a temperature of from about 400° F. to about 900° F., a pressure of from about 50 to about 3000 psig and a liquid hourly space velocity of from about 0.1 to about 10.
Claim 8
Dependent Claim
47 words
The process of claim 1 wherein the dewaxing reactors operate at conditions including a temperature of from about 550° F. to about 750° F., a pressure of from about 500 to about 1500 psig and a liquid hourly space velocity of from about 0.5 to about 2.
Claim 9
Dependent Claim
66 words
The process of claim 1 wherein the hydrotreating reactor operates at conditions including a temperature of from about 400° F. to about 600° F., a pressure of from about 50 to about 3000 psig and a liquid hourly space velocity of from about 0.1 to about 10, and a hydrogen circulation rate of from about 500 to about 10,000 standard cubic feet per barrel of feed.
Claim 10
Dependent Claim
29 words
The process of claim 6 wherein the dewaxing reactors operate at a hydrogen circulation rate of from about 500 to about 10,000 standard cubic feet per barrel of feed.
Claim 11
Dependent Claim
29 words
The process of claim 7 wherein the dewaxing reactors operate at a hydrogen circulation rate of from about 1,000 to about 5,000 standard cubic feet per barrel of feed.
Claim 12
Dependent Claim
14 words
The process of claim 1 wherein the dewaxing catalysts contain a metal hydrogenation component.
Claim 13
Dependent Claim
14 words
The process of claim 2 wherein the dewaxing catalysts contain a metal hydrogenation component.
Claim 14
Dependent Claim
14 words
The process of claim 3 wherein the dewaxing catalysts contain a metal hydrogenation component.
Claim 15
Dependent Claim
25 words
The process of claim 1 wherein the zeolite in the first dewaxing reactor is ZSM-23 and the zeolite in the second dewaxing reactor is ZSM-5.
Claim 16
Dependent Claim
14 words
The process of claim 14 wherein the dewaxing catalysts contain a metal hydrogenation component.
Claim 17
Dependent Claim
12 words
The process of claim 15 wherein the metal hydrogenation component is platinum.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-08-11 | 1990-02-10 | 1990-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-11 | 1994-02-10 | 1994-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-11 | 1998-02-10 | 1998-08-12 | $7700.00 | Window Closed / Lapsed |