US3956102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrodewaxing
Assignee: Mobil Oil AS
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Filing: 1974-06-05
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Granted: 1976-05-11
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Expires: 1994-06-05
Abstract
Abstract A method for the operation of a hydrodewaxing unit wherein a petroleum distillate is separated into two streams, one having a pour point of above about 30 DEG F, and the other having a pour point of less than about 30 DEG F., the 30 DEG F plus pour point fraction is treated in a hydrodewaxing unit with a ZSM-5 type catalyst under hydroprocessing conditions while the 30 DEG F. minus pour point portion is untreated and combined with the hydrodewaxed product. The process yields a net production of hydrogen, and exhibits excellent catalyst aging characteristics.
Inventors
- 👤 Nai Yuen Chen
- 👤 Bernard M. Gillespie
- 👤 Henry R. Ireland
- 👤 Thomas R. Stein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:16
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J29/42; B01J29/46; B01J2229/00; B01J2229/10; B01J2229/26; B01J2229/30; B01J2229/42; C; C10; C10G; C10G2400/00; C10G2400/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
111 words
In the method for catalytically hydrodewaxing a petroleum distillate by contact of said distillate and hydrogen with a ZSM-5 type catalyst, the improvement which comprises: fractionating said distillate into a high pour-point stream having a four point greater than about 30°F and a low pour-point stream having a pour point less than about 30°F; hydrodewaxing said high pour point stream with said ZSM-5 type catalyst at a temperature of about 500°F to 850°F. a liquid hourly space velocity of about 0.5 to 10 LHSV, and a hydrogen pressure of about 100 to 1,500 p.s.i.g., whereby there is no consumption of hydrogen; and combining the hydrodewaxed stream with said low pour-point stream.
Claim 2
Dependent Claim
111 words
In the method for catalytically hydrodewaxing a petroleum distillate by contact of said distillate and hydrogen with a ZSM-5 type catalyst, the improvement which comprises: fractionating said distillate into a high pour-point stream having a four point greater than about 30°F and a low pour-point stream having a pour point less than about 30°F; hydrodewaxing said high pour point stream with said ZSM-5 type catalyst at a temperature of about 500°F to 850°F. a liquid hourly space velocity of about 0.5 to 10 LHSV, and a hydrogen pressure of about 100 to 1,500 p.s.i.g., whereby there is no consumption of hydrogen; and combining the hydrodewaxed stream with said low pour-point stream.
Claim 3
Dependent Claim
19 words
The method as claimed in claim 1 wherein said distillate has an endpoint of about 750° to about 900°F.
Claim 4
Dependent Claim
104 words
In the method for catalytically hydrodewaxing a petroleum distillate by contact of said distillate and hydrogen with a ZSM-5 type catalyst, the improvement which comprises: fractionating said distillate into a lower pour distillate and a higher pour distillate at a cut point of about 550° to 750°F; hydrodewaxing said higher pour distillate with said ZSM-5 type catalyst at a temperature of about 500°F to 850°F. a liquid hourly space velocity of about 0.5 to 10 LHSV, and a hydrogen pressure of about 100 to 1,500 p.s.i.g., whereby there is no consumption of hydrogen; and combining the ZSM-5 hydrodewaxed stream with said lower pour distillate.
Claim 5
Dependent Claim
104 words
In the method for catalytically hydrodewaxing a petroleum distillate by contact of said distillate and hydrogen with a ZSM-5 type catalyst, the improvement which comprises: fractionating said distillate into a lower pour distillate and a higher pour distillate at a cut point of about 550° to 750°F; hydrodewaxing said higher pour distillate with said ZSM-5 type catalyst at a temperature of about 500°F to 850°F. a liquid hourly space velocity of about 0.5 to 10 LHSV, and a hydrogen pressure of about 100 to 1,500 p.s.i.g., whereby there is no consumption of hydrogen; and combining the ZSM-5 hydrodewaxed stream with said lower pour distillate.
Claim 6
Dependent Claim
40 words
The method as claimed in claim 3 wherein the hydrodewaxing conditions comprise the following: a hydrogen pressure of about 300 to 800 psig, a temperature of about 550° to 800°F and a space velocity of about 0.75 to 5 LHSV.
Claim 7
Dependent Claim
17 words
The method as claimed in claim 3 wherein said petroleum distillate has an endpoint of about 800°F.
Claim 8
Dependent Claim
13 words
The improved method of claim 1 wherein said ZSM-5 type catalyst is ZSM-5.
Claim 9
Dependent Claim
13 words
The improved method of claim 3 wherein said ZSM-5 type catalyst is ZSM-5.
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) | 1979-05-11 | 1979-11-10 | 1980-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-11 | 1983-11-10 | 1984-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-11 | 1987-11-10 | 1988-05-11 | $7700.00 | Window Closed / Lapsed |