US4405784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making triethylenediamine
Assignee: Air Products and Chemicals Inc
•
Filing: 1981-06-29
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Granted: 1983-09-20
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Expires: 2001-06-29
Abstract
Abstract Strontium diorthophosphate is employed as catalyst for acid catalyzed organic condensation reactions. High conversion and exceptionally high selectivity are obtained by use of strontium diorthophosphate in cyclization reactions such as in the conversion of hydroxyethylpiperazine to triethylenediamine.
Inventors
- 👤 James E. Wells
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:03
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/02; C07D295/023; B; B01; B01J; B01J27/00; B01J27/14; B01J27/16; B01J27/18; B01J27/1802; C07D295/04; C07D295/12; C07D295/125; C07D295/13; C07D487/00; C07D487/02; C07D487/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
52 words
In a method for synthesis of triethylenediamine from nitrogen-containing compounds selected from the group consisting of hydroxyethylpiperazine, crude hydroxyethylpiperazine, N-aminoethyl piperazine, ethanolamines and substituted ethanolamines by condensation reactions in the presence of acidic catalyst, the improvement which comprises the use as such catalyst of a product consisting essentially of SrHPO 4 .
Claim 2
Dependent Claim
52 words
In a method for synthesis of triethylenediamine from nitrogen-containing compounds selected from the group consisting of hydroxyethylpiperazine, crude hydroxyethylpiperazine, N-aminoethyl piperazine, ethanolamines and substituted ethanolamines by condensation reactions in the presence of acidic catalyst, the improvement which comprises the use as such catalyst of a product consisting essentially of SrHPO 4 .
Claim 3
Dependent Claim
25 words
The method as defined in claim 1 wherein said SrHPO 4 is associated with a carrier from the group consisting of silica, alumina and silica-alumina.
Claim 4
Dependent Claim
19 words
The method as defined in claim 1 wherein such condensation reaction is one resulting in the elimination of water.
Claim 5
Dependent Claim
19 words
The method as defined in claim 1 wherein such condensation reaction is one resulting in the elimination of ammonia.
Claim 6
Dependent Claim
18 words
The method as defined in claim 1 wherein such condensation reaction comprises the production of triethylenediamine from hydroxyethylpiperazine.
Claim 7
Dependent Claim
19 words
The method as defined in claim 1 wherein such condensation reaction comprises the production of triethylenediamine from crude hydroxyethylpiperazine.
Claim 8
Dependent Claim
18 words
The method as defined in claim 1 wherein such reaction comprises the production of triethylene diamine from ethanolamines.
Claim 9
Dependent Claim
19 words
The method as defined in claim 1 wherein such condensation reaction comprises the production of triethylenediamine from N-aminoethyl piperazine.
Claim 10
Independent Claim
24 words
The method as defined in any one of claims 5, 6 or 8, wherein the reaction is carried out in the presence of water.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |