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US3976595A
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Sulfonic acid-type catalysts useful in, for example, esterification reactions
Assignee: Celanese Corp
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Filing: 1975-03-17
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Granted: 1976-08-24
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Expires: 1995-03-17
Abstract
Abstract Sulfonic acid catalysts useful in, for example, esterification reactions and which contain an admixture of any of several phosphorus compounds including specifically ortho-phosphoric acid are much less corrosive toward metal processing equipment than are sulfonic acid catalysts without the phosphoric admixture.
Inventors
- 👤 Robert H. Scott
- 👤 Dan L. Gaulding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:08
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/16; C; C07; C07C; C07C67/00; C07C67/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
41 words
An improved acid-reacting catalyst consisting essentially of a mixture of at least one hydrocarbonyl sulfonic acid with at least one phosphorus compound selected from the group consisting of tri-hydrocarbyl phosphate esters, phosphate salts of alkali metals, and the inorganic phosphorus acids.
Claim 2
Dependent Claim
41 words
An improved acid-reacting catalyst consisting essentially of a mixture of at least one hydrocarbonyl sulfonic acid with at least one phosphorus compound selected from the group consisting of tri-hydrocarbyl phosphate esters, phosphate salts of alkali metals, and the inorganic phosphorus acids.
Claim 3
Dependent Claim
19 words
The catalyst of claim 1 wherein the hydrocarbylsulfonic acid constitutes at least about 50% of the mixture by weight.
Claim 4
Dependent Claim
33 words
The catalyst of claim 2 wherein the phosphorus compound is present in the mixture in a concentration of from about 1.5% to about 50% of the mixture by weight, computed as orthophosphoric acid.
Claim 5
Dependent Claim
31 words
The catalyst of claim 3 wherein the phosphorus compound is an inorganic phosphorus acid in a concentration of at least about one part be weight per 100 parts of hydrocarbylsulfonic acid.
Claim 6
Dependent Claim
12 words
The catalyst of claim 4 wherein the phosphorus acid is orthophosphoric acid.
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) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |