US4138587A
Expired / Lapsed
US
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Process for the preparation of dialkyl oxalates
Assignee: Ube Corp
•
Filing: 1977-07-22
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Granted: 1979-02-06
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Expires: 1997-07-22
Abstract
Abstract A process for the preparation of dialkyl oxalates by reacting an aliphatic alcohol with carbon monoxide under pressure, which comprises carrying out the reaction in the presence of (A) A CATALYST COMPRISING A PLATINUM GROUP METAL OR A SALT THEREOF, AND (B) AN ACCELERATOR COMPOSED OF ONE OR MORE COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF NITRIC ACID AND NITROGEN OXIDES.
Inventors
- 👤 Toshiharu Yamasaki
- 👤 Masao Eguchi
- 👤 Schinichiro Uchiumi
- 👤 Keigo Nishihira
- 👤 Masayoshi Yamashita
- 👤 Hiroshi Itatani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:26
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/34; C07C69/36
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
78 words
A process for the preparation of dialkyl oxalates by reacting an alkanol having from 1 to 6 carbon atoms with carbon monoxide under pressure, which comprises carrying out the reaction in the presence of (a) a catalytic amount of a catalyst comprising a platinum group metal or a salt thereof, (b) an accelerating amount of an accelerator composed of one or more compounds selected from the group consisting of nitric acid and nitrogen oxides, and (c) molecular oxygen.
Claim 2
Dependent Claim
78 words
A process for the preparation of dialkyl oxalates by reacting an alkanol having from 1 to 6 carbon atoms with carbon monoxide under pressure, which comprises carrying out the reaction in the presence of (a) a catalytic amount of a catalyst comprising a platinum group metal or a salt thereof, (b) an accelerating amount of an accelerator composed of one or more compounds selected from the group consisting of nitric acid and nitrogen oxides, and (c) molecular oxygen.
Claim 3
Dependent Claim
23 words
The process as claimed in claim 1, in which said accelerator is selected from the group consisting of nitric acid and nitrogen dioxide.
Claim 4
Dependent Claim
15 words
The process as claimed in claim 1, in which the platinum group metal is palladium.
Claim 5
Dependent Claim
21 words
The process as claimed in claim 1, in which the salt of the platinum group metal is a salt of palladium.
Claim 6
Dependent Claim
26 words
The process as claimed in claim 1, in which the catalyst is used in an amount of 0.0001-2.0 g. per 100 ml. of the aliphatic alcohol.
Claim 7
Dependent Claim
26 words
The process as claimed in claim 1, in which the catalyst is used in an amount of 0.001-0.5 g. per 100 ml. of the aliphatic alcohol.
Claim 8
Dependent Claim
22 words
The process as claimed in claim 1, in which the accelerator is employed in a molar amount of 100-50,000 times the catalyst.
Claim 9
Dependent Claim
22 words
The process as claimed in claim 1, in which the accelerator is employed in a molar amount of 500-10,000 times the catalyst.
Claim 10
Dependent Claim
22 words
The process as claimed in claim 6, in which the accelerator is employed in a molar amount of 500-10,000 times the catalyst.
Claim 11
Dependent Claim
18 words
The process as claimed in claim 1, in which the reaction temperature is between 60° and 150° C.
Claim 12
Dependent Claim
18 words
The process as claimed in claim 1, in which the reaction temperature is between 80° and 120° C.
Claim 13
Dependent Claim
20 words
The process as claimed in claim 1, in which carbon monoxide pressure is between 40 and 120 Kg./cm 2 G.
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) | 1982-02-05 | 1982-08-07 | 1983-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-05 | 1986-08-07 | 1987-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-05 | 1990-08-07 | 1991-02-06 | $7700.00 | Window Closed / Lapsed |