Patent US3940432A successfully refreshed from Google Patents.
US3940432A
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Process for making ethylene glycol
Assignee: Union Carbide Corp
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Filing: 1974-05-15
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Granted: 1976-02-24
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Expires: 1994-05-15
Abstract
Abstract This invention is concerned with improving the ethylene glycol production capabilities of the metal carbonyl catalyzed reaction between carbon monoxide and hydrogen by conducting the reaction such that the ethylene glycol concentration in the reaction mixture is less than 5 gram moles per liter, preferably between about 0.4 to 5 gram moles per liter of reaction mixture and the molar formation ratio between ethylene glycol and methanol in the reaction mixture exceeds about 0.3. In a preferred embodiment, a continuous process is operated in such a manner that the concentration of ethylene glycol in the product mixture removed from the reactor is greater than the average concentration of ethylene glycol in the reactor.
Inventors
- 👤 Wellington E. Walker
- 👤 Jean B. Cropley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:24
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/02; B01J31/0234; B01J31/0235; B01J31/0244; B01J31/0241; B01J31/16; B01J31/18; B01J31/1805; B01J31/20; C; C07; C07C; C07C29/00; C07C29/15; C07C29/151; C07C29/1512; C07C29/1514; C07C29/152; C07C29/153; C07C29/156; C07C29/157; C07C29/158; B01J2231/00; B01J2231/60; B01J2231/64; B01J2231/641; B01J2231/648; B01J2531/00; B01J2531/02; B01J2531/0202; B01J2531/0211; B01J2531/80; B01J2531/82; B01J2531/822; B01J31/22; B01J31/2204; B01J31/2208; B01J31/2226; B01J31/223; B01J31/2234; B01J31/40; B01J31/4015; B01J31/4023; B01J31/4038; B01J31/4046; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y02P20/584
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
129 words
In the continuous process of producing ethylene glycol and methanol which comprises converting a mixture of a continuous feed of carbon monoxide and a continuous feed of hydrogen to produce ethylene glycol and methanol by contacting said mixture with a catalytic amount of rhodium in complex combination with carbon monoxide, at a temperature of between about 100°C. to about 375°C. and a pressure of between about 500 p.s.i.a. and about 50,000 p.s.i.a. sufficient to form said ethylene glycol and methanol, wherein the improvement comprises maintaining the concentration of ethylene glycol in the reaction mixture at less than about 5 gram moles per liter of reaction mixture from said reaction and maintaining the molar formation ratio between ethylene glycol and methanol in the reaction mixture in excess of about 0.3.
Claim 2
Dependent Claim
129 words
In the continuous process of producing ethylene glycol and methanol which comprises converting a mixture of a continuous feed of carbon monoxide and a continuous feed of hydrogen to produce ethylene glycol and methanol by contacting said mixture with a catalytic amount of rhodium in complex combination with carbon monoxide, at a temperature of between about 100°C. to about 375°C. and a pressure of between about 500 p.s.i.a. and about 50,000 p.s.i.a. sufficient to form said ethylene glycol and methanol, wherein the improvement comprises maintaining the concentration of ethylene glycol in the reaction mixture at less than about 5 gram moles per liter of reaction mixture from said reaction and maintaining the molar formation ratio between ethylene glycol and methanol in the reaction mixture in excess of about 0.3.
Claim 3
Dependent Claim
34 words
The process of claim 1 wherein the concentration of ethylene glycol in the product recovered from the reaction is greater than the average concentration of ethylene glycol in the reaction mixture prior to recovery.
Claim 4
Dependent Claim
25 words
The process of claim 1 wherein the rhodium in complex combination with carbon monoxide is in the form of a ionic rhodium carbonyl cluster compound.
Claim 5
Dependent Claim
15 words
The process of claim 3 wherein the temperature is between about 190°C. to about 275°C.
Claim 6
Dependent Claim
19 words
The process of claim 4 wherein the pressure is below about 14,000 p.s.i.a. and greater than about 1,000 p.s.i.a.
Claim 7
Dependent Claim
17 words
The process of claim 5 wherein the reaction is carried out in dimethyl ether of tetraethylene glycol.
Claim 8
Dependent Claim
23 words
The process of claim 1 wherein the concentration of ethylene glycol is between 0.4 and 5 gram moles per liter of reaction mixture.
References Cited (Backward Citations)
US1741307A
Cited
GB655237A
Cited
US2636046A
Cited
US2534018A
Cited
US3081357A
Cited
US3351666A
Cited
US3644446A
Cited
US3833634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |