US4588531A
Expired / Lapsed
US
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Preparation of alkali metal and alkaline earth metal salts of acyloxybenzenesulfonic acids
Assignee: BASF SE
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Filing: 1984-10-18
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Granted: 1986-05-13
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Expires: 2004-10-18
Abstract
Abstract Alkali metal and alkaline earth metal salts of acyloxybenzenesulfonic acids of the formula I ##STR1## where R is a saturated or unsaturated alkyl radical of 1 to 17 carbon atoms or is phenyl which is unsubstituted or monosubstituted or disubstituted by alkyl of 1 to 3 carbon atoms, halogen, methoxy or nitro, are prepared by neutralization, by a method in which a liquid acyloxybenzenesulfonic acid of the formula I and an aqueous solution of an alkali metal or alkaline earth metal hydroxide, carbonate or bicarbonate are combined in water, at from 0° to 60° C. and while mixing throughly, so that the pH is kept at from 2.5 to 7.0, and, if desired, the resulting salt is isolated from the aqueous solution in a conventional manner.
Inventors
- 👤 Wolf-Dieter Balzer
- 👤 Hans-Heinrich Bechtolsheimer
- 👤 Karl-Heinz Beyer
- 👤 Rolf Fikentscher
- 👤 Johannes Perner
- 👤 Rudi Widder
- 👤 Helmut Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:54
CPC Classifications
C; C07; C07C; C07C309/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
137 words
A process for the preparation of an alkali metal or alkaline earth metal salt of an acyloxybenzenesulfonic acid of formula I: ##STR3## wherein R is a saturated or unsaturated alkyl radical of 1 to 17 carbon atoms, phenyl or phenyl monosubstituted or disubstituted by an alkyl radical of 1 to 3 carbon atoms, halogen, methoxy or nitro, comprising: simultaneously adding liquid acyloxybenzenesulfonic acid and a 5-50% strength by weight aqueous solution of an alkali metal or alkaline earth metal hydroxide, carbonate or bicarbonate into water at a temperature of from 0° to 60° C.; and mixing the added ingredients during the addition process such that the acyloxybenzenesulfonic acid is neutralized with the pH of the water medium being maintained from 2.5 to 7.0, thereby forming an aqueous solution having an acyloxybenzenesulfonate salt concentration of 20-60% by weight.
Claim 2
Dependent Claim
137 words
A process for the preparation of an alkali metal or alkaline earth metal salt of an acyloxybenzenesulfonic acid of formula I: ##STR3## wherein R is a saturated or unsaturated alkyl radical of 1 to 17 carbon atoms, phenyl or phenyl monosubstituted or disubstituted by an alkyl radical of 1 to 3 carbon atoms, halogen, methoxy or nitro, comprising: simultaneously adding liquid acyloxybenzenesulfonic acid and a 5-50% strength by weight aqueous solution of an alkali metal or alkaline earth metal hydroxide, carbonate or bicarbonate into water at a temperature of from 0° to 60° C.; and mixing the added ingredients during the addition process such that the acyloxybenzenesulfonic acid is neutralized with the pH of the water medium being maintained from 2.5 to 7.0, thereby forming an aqueous solution having an acyloxybenzenesulfonate salt concentration of 20-60% by weight.
Claim 3
Dependent Claim
27 words
The process as claimed in claim 1, wherein the neutralization is carried out at from 10° to 40° C. and a pH of from 3.0 to 5.5.
Claim 4
Dependent Claim
53 words
The process as claimed in claim 1, wherein the neutralization is carried out in the presence of from 1 to 2% by weight, based on the acyloxybenzenesulfonic acid, of a soluble phosphate, phosphite or tartrate, of a complexing agent for heavy metal salts, or of a polymer of acrylic acid and/or maleic acid.
Claim 5
Dependent Claim
18 words
The process as claimed in claim 1, wherein the product acyloxybenzenesulfonate salt is isolated from the aqueous solution.
Claim 6
Dependent Claim
17 words
The process as claimed in claim 1, wherein the neutralization process takes from 3 to 10 hours.
References Cited (Backward Citations)
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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) | 1989-05-12 | 1989-11-11 | 1990-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-12 | 1993-11-11 | 1994-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-12 | 1997-11-11 | 1998-05-13 | $7700.00 | Window Closed / Lapsed |