US4510045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrocarbon dewaxing process using steam-activated alkali metal zeolite catalyst
Assignee: Mobil Oil AS
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Filing: 1984-03-16
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Granted: 1985-04-09
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Expires: 2004-03-16
Abstract
Abstract In a hydrodewaxing process wherein wax-containing hydrocarbon feedstock is passed over a zeolite dewaxing catalyst in the presence of hydrogen under dewaxing conditions of elevated temperature and pressure, said catalyst comprising alkali metal zeolites having a silica to alumina greater than about 12, a constraint index of about 1 to 12, and an initial alpha value less than about 2; the improvement which comprises: forming a mixture of the alkali metal zeolite with alumina and steaming the mixture at a temperature of at least about 300 DEG C. for at least two hours to increase alpha value.
Inventors
- 👤 Ralph M. Dessau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:19
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/02; C10G11/04; C10G11/05; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J2229/00; B01J2229/10; B01J2229/20; B01J2229/26; B01J2229/30; B01J2229/36; B01J2229/42; B01J29/65; B01J29/70
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
91 words
In a hydrodewaxing process wherein wax-containing hydrocarbon feedstock is passed over an alkali metal zeolite having a silica to alumina ratio greater than about 12, a constraint index of about 1 to 12, and an initial alpha value less than about 2 in the presence of hydrogen under dewaxing conditions of elevated temperature and pressure, the improvement which comprises: forming a mixture of the alkali metal zeolite with alumina and steaming the mixture at a temperature of at least about 300° C. for at least two hours to increase alpha value.
Claim 2
Dependent Claim
91 words
In a hydrodewaxing process wherein wax-containing hydrocarbon feedstock is passed over an alkali metal zeolite having a silica to alumina ratio greater than about 12, a constraint index of about 1 to 12, and an initial alpha value less than about 2 in the presence of hydrogen under dewaxing conditions of elevated temperature and pressure, the improvement which comprises: forming a mixture of the alkali metal zeolite with alumina and steaming the mixture at a temperature of at least about 300° C. for at least two hours to increase alpha value.
Claim 3
Dependent Claim
12 words
A method according to claim 1 in which the zeolite is ZSM-5.
Claim 4
Dependent Claim
17 words
A method according to claim 1 in which the zeolite is ZSM-11, ZSM-12, ZSM-23, ZSM-35 or ZSM-38.
Claim 5
Dependent Claim
15 words
A method according to claim 1 in which the zeolite is in th sodium form.
Claim 6
Dependent Claim
16 words
The method of claim 1 wherein NaZSM-5 is steamed at about 400° C. to 500° C.
Claim 7
Dependent Claim
22 words
The method of claim 1 wherein the mixture comprises said zeolite and binder in a weight ratio of about 10:90 to 90:10.
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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) | 1988-04-08 | 1988-10-08 | 1989-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-08 | 1992-10-08 | 1993-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-08 | 1996-10-08 | 1997-04-09 | $7700.00 | Window Closed / Lapsed |