US3767561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alpha-olefin polymers as dewaxing aids
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1971-07-21
•
Granted: 1973-10-23
•
Expires: 1991-07-21
Abstract
Abstract Ziegler-type polymers comprising C14-C24 alpha-monoolefins and having a number average molecular weight within the range between about 1,000 and about 200,000 are effective dewaxing aids for improving the efficiency of the separation of wax from hydrocarbon oils. Preferred dewaxing aids include mixtures of two or more homopolymers of C14-C24 alpha-monoolefins and copolymers of two or more alpha-monoolefins containing from 14 to 24 carbon atoms in the molecule. The Ziegler-type polymers when combined with Friedel-Crafts condensation products of chlorinated wax and naphthalene synergistically improve the separation of wax from petroleum oils.
Inventors
- 👤 N Jacobson
- 👤 W Song
- 👤 A Rossi
- 👤 E Tornqvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:32
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
31 words
In a process as defined by claim 1, said oil-soluble polymer being said copolymer of C3-C12 alpha-monoolefin and said C14-C20 alpha-monoolefin, and wherein said polymer is the sole dewaxing aid present.
Claim 2
Dependent Claim
37 words
In a process as defined by claim 2, said copolymer consisting of 15 to 60 wt. % hexene-1, 10 to 50 wt. % n-hexaDecene-1, 10 to 40 wt. % n-octadecene-1 and 5 to 30 wt. % n-eicosene-1.
Claim 3
Dependent Claim
39 words
In a process as defined by claim 1, said oil-soluble polymer being a copolymer of at least two different C14-C20 alpha-olefins, and wherein at least two of said alpha-monoolefins each comprises 10 to 90 wt. % of the polymer.
Claim 4
Dependent Claim
27 words
In a process as defined by claim 4, the improvement wherein the number average molecular weight of said copolymer is in the range of 2,000 to 30,000.
Claim 5
Dependent Claim
40 words
In a process as defined by claim 1, said oil-soluble polymer is said mixture of at least two different homopolymers of a C14-C24 alpha-monoolefin, and wherein no one homopolymer accounts for more than 70 wt. % of the polymeric mixture.
Claim 6
Dependent Claim
37 words
In a process according to claim 1, a second dewaxing aid which is the Friedel-Crafts condensation product of a halogenated paraffin with an aromatic hydrocarbon is also incorporated into the oil with said Ziegler type oil-soluble polymer.
Claim 7
Dependent Claim
39 words
In a process as defined by claim 7, said Friedel-Crafts condensation product being a condensation product of naphthalene and paraffin wax having a melting point of 120* to 190*F. and chlorinated to contain 5 to 25 wt. % chlorine.
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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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |