US4597893A
Expired / Lapsed
US
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Dispersant composition
Assignee: DARCY INDUSTRIES Ltd
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Filing: 1983-06-06
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Granted: 1986-07-01
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Expires: 2003-06-06
Abstract
Abstract A dispersant composition suitable for dispersing crude oil or petroleum products floating on the surface of water comprises a combination of a selected non-ionic surfactant and an anionic surfactant in a suitable solvent. The non-ionic surfactant is an ester of a polyalkoxylated sorbitol or sorbitan and a fatty acid. The anionic surfactant is selected from the group comprising calcium sulphonate, magnesium sulphonate, sodium sulphonate, triethanolamine sulphonate and isopropylamine sulphonate. Suitable solvents are C 5 to C 10 alcohols, glycols and glycol ethers. The dispersant composition is particularly suitable for use in cold, low salinity water.
Inventors
- 👤 Derek C. Byford
- 👤 Peter J. Green
- 👤 Alun Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:38
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/68; C02F1/682; C09; C09K; C09K23/00; C09K23/017; Y; Y10; Y10S; Y10S210/00; Y10S210/918; Y10S210/922; Y10S210/925; Y10S516/00; Y10S516/01; Y10S516/06; Y10S516/07
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
126 words
A dispersant composition suitable for dispersing crude oil or petroleum products floating on the surface of water comprises; (A) 8 to 58% by weight of a non-ionic surfactant which is an ester of a polyalkoxylated sorbitol or sorbitan and a fatty acid having from 12 to 20 carbon atoms, (B) 7 to 30% by weight of an anionic surfactant which is selected from the group comprising calcium sulphonate, magnesium sulphonate, sodium sulphonate, triethanolamine sulphonate and isopropylamine sulphonate, (C) 85 to 30% by weight of a solvent which comprises one or more alcohol, glycol or glycol-ether each of which has from 5 to 10 carbon atoms, and (D) 0 to 15% by weight water, the ratio of non-ionic surfactant to anionic surfactant being from 5:1 to 1:2.
Claim 2
Dependent Claim
126 words
A dispersant composition suitable for dispersing crude oil or petroleum products floating on the surface of water comprises; (A) 8 to 58% by weight of a non-ionic surfactant which is an ester of a polyalkoxylated sorbitol or sorbitan and a fatty acid having from 12 to 20 carbon atoms, (B) 7 to 30% by weight of an anionic surfactant which is selected from the group comprising calcium sulphonate, magnesium sulphonate, sodium sulphonate, triethanolamine sulphonate and isopropylamine sulphonate, (C) 85 to 30% by weight of a solvent which comprises one or more alcohol, glycol or glycol-ether each of which has from 5 to 10 carbon atoms, and (D) 0 to 15% by weight water, the ratio of non-ionic surfactant to anionic surfactant being from 5:1 to 1:2.
Claim 3
Dependent Claim
23 words
A dispersant composition as claimed in claim 1 in which the ratio of non-ionic surfactant to anionic surfactant is from 2:1 to 2:3.
Claim 4
Dependent Claim
30 words
A dispersant composition as claimed in claim 1 in which the polyalkoxylated sorbitol or sorbitan used to prepare the non-ionic surfactant contains from 5 to 55 moles of ethylene oxide.
Claim 5
Dependent Claim
29 words
A dispersant composition as claimed in claim 3 in which the nonionic surfactant is selected from the group comprising polyoxyethylene sorbitol hexaoleate, polyoxyethylene sorbitan monooleate and polyoxyethylene sorbitan trioleate.
Claim 6
Dependent Claim
23 words
A dispersant composition as claimed in claim 1 in which the anionic surfactant is calcium dodecyl benzene sulphonate or isopropylamine dodecyl benzene sulphonate.
Claim 7
Dependent Claim
25 words
A dispersant composition as claimed in claim 1 in which the solvent comprises a glycol-ether and one or more C 7 to C 10 alcohols.
Claim 8
Dependent Claim
33 words
A dispersant composition as claimed in claim 6 in which the one or more C 7 to C 10 alcohols comprises 10 to 42% by weight of the total weight of the solvent.
Claim 9
Dependent Claim
22 words
A dispersant composition as claimed in claim 6 in which the glycol-ether is ethylene glycol monobutyl ether or dipropylene glycol monomethyl ether.
Claim 10
Dependent Claim
23 words
A dispersant composition as claimed in claim 1 which comprises 7.5 to 10% water by weight of the total weight of the composition.
Claim 11
Dependent Claim
118 words
A dispersant composition suitable for dispersing crude oil or petroleum products floating on the surface of water comprising: (a) 30-37.5% by weight of a non-ionic surfactant which is an ester of a polyalkoxylated sorbitan and a fatty acid having from 12 to 20 carbon atoms, (b) 22 to 30% by weight of an anionic surfactant which is selected from the group comprising calcium sulphonate, magnesium sulphonate, sodium sulphonate, triethanolamine sulphonate and isopropylamine sulphonate, (c) 0 to 15% by weight water, (d) the remainder being a solvent which comprises one or more alcohol, glycol or glycolether each of which has from 5 to 10 carbon atoms; the ratio of non-ionic surfactants to anionic surfactant being from 1:1 to 1.67:1.
Claim 12
Dependent Claim
118 words
A dispersant composition suitable for dispersing crude oil or petroleum products floating on the surface of water comprising: (a) 30-37.5% by weight of a non-ionic surfactant which is an ester of a polyalkoxylated sorbitan and a fatty acid having from 12 to 20 carbon atoms, (b) 22 to 30% by weight of an anionic surfactant which is selected from the group comprising calcium sulphonate, magnesium sulphonate, sodium sulphonate, triethanolamine sulphonate and isopropylamine sulphonate, (c) 0 to 15% by weight water, (d) the remainder being a solvent which comprises one or more alcohol, glycol or glycolether each of which has from 5 to 10 carbon atoms; the ratio of non-ionic surfactants to anionic surfactant being from 1:1 to 1.67:1.
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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) | 1989-06-30 | 1989-12-30 | 1990-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-30 | 1993-12-30 | 1994-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-30 | 1997-12-30 | 1998-07-01 | $7700.00 | Window Closed / Lapsed |