US4082690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antifoam process for non-aqueous systems
Assignee: Dow Silicones Corp
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Filing: 1977-02-07
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Granted: 1978-04-04
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Expires: 1997-02-07
Abstract
Abstract A method or process for reducing and/or preventing foam in non-aqueous systems such as crude oil and coking processes is disclosed. The method involves the use of a composition consisting essentially of (1) a polydimethylsiloxane fluid, (2) a particular siloxane resin, and (3) a hydrocarbon solvent.
Inventors
- 👤 Kenneth W. Farminer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:13
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404; B01D19/0409
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
102 words
A method for reducing and/or preventing foam in a non-aqueous system which comprises adding to said system a composition consisting essentially of (1) about 30 to 45 percent by weight of a polydimethylsiloxane fluid, (2) about 1 to 5 percent by weight of a siloxane resin composed of (CH 3 ) 3 SiO 1/2 units and SiO 2 units in which resin the ratio of (CH 3 ) 3 SiO 1/2 units to SiO 2 units is in the range of 0.4:1 to 1.2:1, and (3) about 50 to 69 percent by weight of a hydrocarbon solvent for said fluid and resin.
Claim 2
Independent Claim
102 words
A method for reducing and/or preventing foam in a non-aqueous system which comprises adding to said system a composition consisting essentially of (1) about 30 to 45 percent by weight of a polydimethylsiloxane fluid, (2) about 1 to 5 percent by weight of a siloxane resin composed of (CH 3 ) 3 SiO 1/2 units and SiO 2 units in which resin the ratio of (CH 3 ) 3 SiO 1/2 units to SiO 2 units is in the range of 0.4:1 to 1.2:1, and (3) about 50 to 69 percent by weight of a hydrocarbon solvent for said fluid and resin.
Claim 3
Dependent Claim
89 words
A method as defined in claim 1 wherein the non-aqueous system is a hydrocarbon liquid, (1) is about 35 to 40 percent and has a viscosity in the range of 1000 to 60,000 centistokes, (2) is about 2 to 4 percent and the ratio of (CH 3 ) 3 SiO 1/2 units to SiO 2 units is in the range of 0.6:1 to 1:1, and (3) is about 55 to 65 percent and is selected from the group consisting of xylene, toluene, mineral spirits, stoddard solvent, kerosene, and naphtha.
Claim 4
Dependent Claim
19 words
A method as defined in claim 2 wherein the non-aqueous system is crude oil and (3) is predominately kerosene.
Claim 5
Dependent Claim
19 words
A method as defined in claim 2 wherein the non-aqueous system is crude oil, and (3) is predominately naphtha.
Claim 6
Dependent Claim
15 words
A method as defined in claim 4 wherein the naphtha is an aliphatic petroleum naphtha.
Claim 7
Dependent Claim
25 words
A method as defined in claim 2 wherein the non-aqueous system is a residual petroleum stock in a coking process, and (3) is predominately kerosene.
Claim 8
Dependent Claim
25 words
A method as defined in claim 2 wherein the non-aqueous system is a residual petroleum stock in a coking process, and (3) is predominately naphtha.
Claim 9
Dependent Claim
15 words
A method as defined in claim 7 wherein the naphtha is an aliphatic petroleum naphtha.
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) | 1981-04-03 | 1981-10-03 | 1982-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-03 | 1985-10-03 | 1986-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-03 | 1989-10-03 | 1990-04-04 | $7700.00 | Window Closed / Lapsed |