Patent US3291174A successfully refreshed from Google Patents.
Patent US4315865A successfully refreshed from Google Patents.
US4315865A
Expired / Lapsed
US
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Process for the production of sulfuric acid semiester compounds by sulfation in a machine employing kneading action
Assignee: Hoechst AG
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Filing: 1978-05-31
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Granted: 1982-02-16
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Expires: 1998-05-31
Abstract
Abstract Improved process for the sulfatation of the hydroxy group of a beta -hydroxy-ethylsulfonyl group present in compounds selected from the dyestuff class which comprises carrying out the reaction in a machine operating with a kneading action and effect and with the use of only 1 to 5 times the equimolar amount of a concentrated sulfuric acid, of oleum or sulfur dioxide itself. The beta -sulfatoethylsulfonyl group containing dyestuffs, thus prepared have a high purity and are obtained in a high yield and esterification rate. Above all, the novel process is distinguished by a highly reduced salt and acid content of the waste water.
Inventors
- 👤 Ernst Hoyer
- 👤 Hans H. Steuernagel
- 👤 Dieter Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:23
CPC Classifications
C; C09; C09B; C09B62/00; C09B62/44; C09B62/503
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
121 words
In a process for the preparation of a compound of the formula F--SO.sub.2 --CH.sub.2 --CH.sub.2 --OSO.sub.3 H).sub.n in which F is the radical of an organic dyestuff molecule and n is the number 1, 2, 3 or 4, by esterification of a compound of the formula F--SO.sub.2 --CH.sub.2 --CH.sub.2 --OH).sub.n or a salt thereof in which F and n have the above meanings, by a sulfuric acid or sulfur trioxide agent, the improvement which comprises carrying out the reaction in a machine operating with a kneading action and with 1 to 5 times the equimolar amount, calculated on one mol of SO 3 , of 92 to 100% strength sulfuric acid or sulfuric acid containing sulfur trioxide or sulfur trioxide itself.
Claim 2
Dependent Claim
121 words
In a process for the preparation of a compound of the formula F--SO.sub.2 --CH.sub.2 --CH.sub.2 --OSO.sub.3 H).sub.n in which F is the radical of an organic dyestuff molecule and n is the number 1, 2, 3 or 4, by esterification of a compound of the formula F--SO.sub.2 --CH.sub.2 --CH.sub.2 --OH).sub.n or a salt thereof in which F and n have the above meanings, by a sulfuric acid or sulfur trioxide agent, the improvement which comprises carrying out the reaction in a machine operating with a kneading action and with 1 to 5 times the equimolar amount, calculated on one mol of SO 3 , of 92 to 100% strength sulfuric acid or sulfuric acid containing sulfur trioxide or sulfur trioxide itself.
Claim 3
Dependent Claim
22 words
A process according to claim 1, in which the reaction is carried out at a temperature of between 80° and 120° C.
Claim 4
Dependent Claim
23 words
A process according to claim 1, wherein 96-100% strength sulfuric acid, or sulfuric acid containing sulfur trioxide, is used as the esterification agent.
Claim 5
Dependent Claim
75 words
A process according to claim 1, wherein an aminoanthraquinone compound of the formula ##STR167## in which R 1 is hydrogen, lower alkoxy or carboxy and R 2 is hydrogen or lower alkoxy, with the proviso that at least one of the two substituents R 1 and R 2 is hydrogen, or a salt thereof is esterified to yield a compound of the formula ##STR168## in which R 1 and R 2 have the above meanings.
Claim 6
Dependent Claim
15 words
A process according to claim 4, wherein R 1 and R 2 each is hydrogen.
Claim 7
Dependent Claim
16 words
A process according to claim 4, wherein R 1 is carboxy and R 2 is hydrogen.
Claim 8
Dependent Claim
16 words
A process according to claim 4, wherein R 1 is hydrogen and R 2 is methoxy.
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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) | 1985-02-15 | 1985-08-17 | 1986-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-15 | 1989-08-17 | 1990-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-15 | 1993-08-17 | 1994-02-16 | $7700.00 | Window Closed / Lapsed |