US4165291A
Expired / Lapsed
US
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Overbasing calcium petroleum sulfonates in lubricating oils employing monoalkylbenzene
Assignee: Phillips Petroleum Co
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Filing: 1978-06-20
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Granted: 1979-08-21
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Expires: 1998-06-20
Abstract
Abstract A calcium petroleum sulfonate containing lubricating oil is overbased using lime, carbon dioxide, a low boiling alcohol and a monoalkylbenzene solvent. In one embodiment a propane-fractionated lubricating oil, calcium petroleum sulfonate, toluene, methanol and hydrated lime are treated with carbon dioxide at a temperature of about 60° C. for about 20 minutes. A resulting overbased calcium petroleum sulfonate obtained exhibited a base number of 315.
Inventors
- 👤 James T. Gragson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:26
CPC Classifications
C; C10; C10M; C10M159/00; C10M159/12; C10M159/20; C10M159/24
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
67 words
A process for overbasing a calcium petroleum sulfonate containing oil to prepare a lubricating oil additive which comprises dissolving a diluent lubricating oil fraction and a calcium petroleum sulfonate in a monoalkylbenzene solvent and in the presence of a relatively small amount of a low-boiling alcohol, and lime, introducing carbon dioxide into the mixture thus obtained in a gradual manner to obtain a high TBN overbased product.
Claim 2
Dependent Claim
67 words
A process for overbasing a calcium petroleum sulfonate containing oil to prepare a lubricating oil additive which comprises dissolving a diluent lubricating oil fraction and a calcium petroleum sulfonate in a monoalkylbenzene solvent and in the presence of a relatively small amount of a low-boiling alcohol, and lime, introducing carbon dioxide into the mixture thus obtained in a gradual manner to obtain a high TBN overbased product.
Claim 3
Dependent Claim
36 words
A process according to claim 1 wherein the degree of agitation of the reaction mixture during addition of the carbon dioxide is correlated with the TBN of the product produced to obtain a high desirable overbasing.
Claim 4
Dependent Claim
36 words
A process according to claim 1 wherein the alcohol content of the mixture during carbon dioxide reaction is adjusted to be sufficient to effect the desired overbasing but insufficient to produce an intractable gel to product.
Claim 5
Dependent Claim
28 words
A process according to claim 3 wherein the alcohol is about 3.5 to about 8% by weight of the total of the oil, calcium petroleum sulfonate and solvent.
Claim 6
Dependent Claim
41 words
A process according to claim 3 wherein the carbon dioxide is in the approximate range of from about 0.2 to about 0.8 moles CO 2 per mole of lime added in excess over that needed to neutralize the petroleum sulfonic acid.
Claim 7
Dependent Claim
37 words
A process according to claim 5 wherein the temperature is in the approximate range of from about 25° to about 80° C. but insufficient to substantially remove alcohol from the mixture under the conditions prevailing during carbonation.
Claim 8
Dependent Claim
28 words
A process according to claim 1 wherein the monoalkylbenzene in the solvent is the approximate range of from about 25 to 100% by weight based on total solvent.
Claim 9
Dependent Claim
17 words
A process according to claim 1 wherein the monoalkylbenzene is at least one of toluene and ethylbenzene.
Claim 10
Dependent Claim
17 words
A process according to claim 2 wherein the monoalkylbenzene is at least one of toluene and ethylbenzene.
Claim 11
Dependent Claim
17 words
A process according to claim 3 wherein the monoalkylbenzene is at least one of toluene and ethylbenzene.
Claim 12
Dependent Claim
17 words
A process according to claim 4 wherein the monoalkylbenzene is at least one of toluene and ethylbenzene.
Claim 13
Dependent Claim
17 words
A process according to claim 5 wherein the monoalkylbenzene is at least one of toluene and ethylbenzene.
Claim 14
Dependent Claim
17 words
A process according to claim 6 wherein the monoalkylbenzene is at least one of toluene and ethylbenzene.
Claim 15
Dependent Claim
17 words
A process according to claim 7 wherein the monoalkylbenzene is at least one of toluene and ethylbenzene.
Claim 16
Dependent Claim
22 words
A process according to claim 1 wherein the monoalkylbenzene is at least one having from 1-4 carbon atoms in the alkyl group.
Claim 17
Dependent Claim
13 words
A process according to claim 1 wherein the low boiling alcohol is methanol.
Claim 18
Dependent Claim
16 words
A process according to claim 1 wherein the solvent contains monoalkylbenzene and an aliphatic hydrocarbon solvent.
Claim 19
Dependent Claim
30 words
A process according to claim 1 wherein the diluent lubricating oil is a solvent refined, substantially paraffinic oil having an SUS viscosity at 37.8° C. in the approximate range 50-300.
Claim 20
Dependent Claim
46 words
A process according to claim 18 wherein the diluent lube oil is a Mid-Continent, solvent-refined paraffinic neutral oil having an SUS viscosity in the approximate range of from about 96 to about 98 37.5° C. and suitable for formulation into a lube oil of SAE-10 weight.
Claim 21
Dependent Claim
20 words
A process according to claim 5 wherein the temperature is in the approximate range of from 40° to 65° C.
Claim 22
Dependent Claim
28 words
A process according to claim 18 wherein the temperature during the introduction of carbon dioxide is in the approximate range of from about 45° to about 60° C.
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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) | 1982-08-20 | 1983-02-19 | 1983-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-20 | 1987-02-19 | 1987-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-20 | 1991-02-19 | 1991-08-21 | $7700.00 | Window Closed / Lapsed |