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US3696141A
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Process for the production of methyl benzoate
Assignee: Dynamit Nobel AG
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Filing: 1970-05-27
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Granted: 1972-10-03
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Expires: 1990-05-27
Abstract
Abstract Methyl benzoate having a purity of at least 99 percent is produced from the by-products obtained in the manufacture of dimethyl terephthalate by the oxidation of p-xylene by subjecting said by-products to an oxidative treatment, preferably with molecular oxygen, for example, air, and then fractionally distilling the oxidized product to obtain substantially pure methyl benzoate. In this way, compounds which can be separated only with difficulty from methyl benzoate by fractional distillation are oxidized, leaving only substances which are separable therefrom by distillation.
Inventors
- 👤 Hans Leo Hulsmann
- 👤 Gustav Renckhoff
- 👤 Albino Pastura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:13
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/76; C07C69/78; C07C67/00; C07C67/48; C07C67/60
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
12 words
The process of claim 1, wherein said ketone is methyl ethyl ketone.
Claim 2
Dependent Claim
26 words
The process of claim 1, wherein about 0.05 to 0.5 percent by weight, based on the amount of starting material, of said peroxide-forming compound is employed.
Claim 3
Dependent Claim
15 words
The process of claim 1, wherein said oxidative treatment is conducted by oxidation with air.
Claim 4
Dependent Claim
18 words
The process of claim 1, wherein the product of said oxidative treatment is neutralized before being fractionally distilled.
Claim 5
Dependent Claim
14 words
The process of claim 5, wherein potassium hydroxide is employed as the neutralization agent.
Claim 6
Dependent Claim
17 words
The process of claim 1, wherein said peroxide-forming compound is an aldehyde or an Alpha -methylene ketone.
Claim 7
Dependent Claim
15 words
The process of claim 5, wherein an alkaline hydroxide is employed as the neutralization agent.
References Cited (Backward Citations)
US2894978A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |