US4568746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic preparation of diethylenetriamine
Assignee: Union Carbide Corp
•
Filing: 1982-12-29
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Granted: 1986-02-04
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Expires: 2002-12-29
Abstract
Abstract A process for the production of an amine composition with a high proportion of diethylenetriamine to piperazine comprising reacting ethylenediamine with itself or monoethanolamine in the presence of a nickel, cobalt or rhodium catalyst at temperatures between about 170 DEG C. and 210 DEG C.
Inventors
- 👤 Frank G. Cowherd, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:11
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/64
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
79 words
A process for the production of an amine composition containing a high yield ratio of diethylenetriamine to piperazine which comprises maintaining ethylenediamine in the presence of a nickel, cobalt or rhodium catalyst, wherein the metal is present on the surface of the catalyst in a polyatomic form, and at a temperature between about 170° C. to about 210° C. and for a reaction time sufficient to produce diethylenetriamine and convert less than about 35% of the ethylenediamine to polyamine.
Claim 2
Dependent Claim
79 words
A process for the production of an amine composition containing a high yield ratio of diethylenetriamine to piperazine which comprises maintaining ethylenediamine in the presence of a nickel, cobalt or rhodium catalyst, wherein the metal is present on the surface of the catalyst in a polyatomic form, and at a temperature between about 170° C. to about 210° C. and for a reaction time sufficient to produce diethylenetriamine and convert less than about 35% of the ethylenediamine to polyamine.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the catalyst is Raney nickel.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein the catalyst is Raney cobalt.
Claim 5
Dependent Claim
14 words
The process of claim 1 wherein the catalyst is Ni/Re/B on a silica support.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein the conversion of ethylenediamine is less than about 30%.
Claim 7
Dependent Claim
15 words
The process of claim 1 wherein the conversion of ethylenediamine is less than about 25%.
Claim 8
Dependent Claim
85 words
A process for the production of an amine composition containing a high yield ratio of diethylenetriamine to piperazine which comprises maintaining a mixture of ethylenediamine and monoethanolamine in the presence of a nickel, cobalt or rhodium catalyst, wherein the metal is present on the surface of the catalyst in a polyatomic form, and at a temperature between about 170° C. and about 210° C. and for a reaction time sufficient to produce diethylenetriamine and convert less than about 35% of the amine reactants to polyamine.
Claim 9
Dependent Claim
85 words
A process for the production of an amine composition containing a high yield ratio of diethylenetriamine to piperazine which comprises maintaining a mixture of ethylenediamine and monoethanolamine in the presence of a nickel, cobalt or rhodium catalyst, wherein the metal is present on the surface of the catalyst in a polyatomic form, and at a temperature between about 170° C. and about 210° C. and for a reaction time sufficient to produce diethylenetriamine and convert less than about 35% of the amine reactants to polyamine.
Claim 10
Dependent Claim
11 words
The process of claim 7 wherein the catalyst is Raney nickel.
Claim 11
Dependent Claim
11 words
The process of claim 7 wherein the catalyst is Raney cobalt.
Claim 12
Dependent Claim
14 words
The process of claim 7 wherein the catalyst is Ni/Re/B on a silica support.
Claim 13
Dependent Claim
16 words
The process of claim 7 wherein the conversion of amine reactants is less than about 30%.
Claim 14
Dependent Claim
16 words
The process of claim 7 wherein the conversion of amine reactants is less than about 25%.
References Cited (Backward Citations)
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US2861995A
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US3068290A
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US3714259A
Cited
GB1508460A
Cited
US4036881A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |