Patent US4021460A successfully refreshed from Google Patents.
US4021460A
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US
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Method for manufacturing α-sulfo fatty acid ester salt
Assignee: LION (LION CORPORATION) KK
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Filing: 1975-10-07
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Granted: 1977-05-03
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Expires: 1995-10-07
Abstract
Abstract A method for manufacturing α-sulfo fatty acid ester salt which comprises the steps of sulfonating a mixture of 100 parts by weight of saturated fatty acid alkyl ester having 9 to 26 carbon atoms and less than 10 parts by weight of inorganic sulfate by sulfonating gas containing 1.0 to 2.0 mols of SO 3 per mol of said fatty acid ester and diluted to a concentration of 3 to 20% by volume by inert gas at a higher reaction temperature than the solidification point of said fatty acid ester, followed by neutralization by caustic alkali. According to this method, an amount of by-product yielded by breakage of an ester linkage is decreased with the resultant lowered coloration of the product. α-sulfo fatty acid ester salt is used preferably as an active component for a detergent composition.
Inventors
- 👤 Toshiaki Ogoshi
- 👤 Shizuo Sekiguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:06
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/02; C07C303/04; C07C303/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
121 words
A method for the manufacture of α-sulfo fatty acid ester salt which comprises: sulfonating a mixture of 100 parts by weight of saturated fatty acid alkyl ester having 9 to 26 carbon atoms and 0.5 to 10 parts by weight of inorganic sulfate selected from the group consisting of sodium, calcium, ferric, aluminum and ammonium sulfates with a sulfonating gas containing about 1 to 2 mols of SO 3 per mol of said fatty acid ester diluted to a concentration of between about 3 to 20% by volume with an inert gas, said sulfonation being conducted at a temperature higher than the solidification point of said fatty acid ester, and thereafter neutralizing the resulting α-sulfo fatty acid ester with caustic alkali.
Claim 2
Independent Claim
121 words
A method for the manufacture of α-sulfo fatty acid ester salt which comprises: sulfonating a mixture of 100 parts by weight of saturated fatty acid alkyl ester having 9 to 26 carbon atoms and 0.5 to 10 parts by weight of inorganic sulfate selected from the group consisting of sodium, calcium, ferric, aluminum and ammonium sulfates with a sulfonating gas containing about 1 to 2 mols of SO 3 per mol of said fatty acid ester diluted to a concentration of between about 3 to 20% by volume with an inert gas, said sulfonation being conducted at a temperature higher than the solidification point of said fatty acid ester, and thereafter neutralizing the resulting α-sulfo fatty acid ester with caustic alkali.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein said inorganic sulfate is an anhydrous powder.
Claim 4
Dependent Claim
32 words
The method of claim 1 wherein said ester is the esterification product of a saturated fatty acid having 8 to 22 carbon atoms and an alcohol having 1 to 6 carbon atoms.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein said ester has an iodine value less than 1.
Claim 6
Dependent Claim
34 words
The method of claim 3 wherein said fatty acid is selected from the group consisting of capric, lauric, myristic, palmitic, stearic, hydrogenated tallow fatty, hydrogenated coconut oil fatty, and hydrogenated palm oil fatty acids.
Claim 7
Dependent Claim
19 words
The method of claim 3 wherein said fatty acid is synthetic fatty acid synthesized form α-olefin and carbon monoxide.
Claim 8
Dependent Claim
20 words
The method of claim 3 wherein said alcohol is selected from the group consisting of methanol, ethanol, propanol and butanol.
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) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |