Patent US3723529A successfully refreshed from Google Patents.
US3723529A
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US
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Decolorization of polyethylene polyamines
Assignee: Texaco Inc
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Filing: 1970-10-19
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Granted: 1973-03-27
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Expires: 1990-10-19
Abstract
Abstract A process is provided for decolorizing ''''polyethylene polyamines,'''' such as triethylenetetramine, and higher homologues, such as tetraethylenepentamine, by treatment with active carbon at elevated temperatures followed by distillation.
Inventors
- 👤 J Pitts
- 👤 C Steele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:06
CPC Classifications
C; C07; C07C; C07C211/00; C07C211/01; C07C211/02; C07C211/14; C07C209/00; C07C209/82; C07C209/84; C07C211/09; C07C211/10; C08; C08G; C08G73/00; C08G73/02; C08G73/0206; C08G73/0213
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
50 words
The process according to claim 1 wherein said temperature is in the range from about 220*C. to 280*C.; wherein said active carbon is employed in an amount to provide at least 2 wt. % active carbon; and wherein said contacting is conducted for a time of at least 2 hours.
Claim 2
Dependent Claim
15 words
The process according to claim 2 wherein said polyethylene polyamine comprises triethylenetetraamine, tetraethylenepentamine, and pentaethylenehexamine.
Claim 3
Dependent Claim
12 words
The process according to claim 3 wherein said polyethylene polyamine is triethylenetetramine.
Claim 4
Dependent Claim
31 words
The process according to claim 2 wherein said polyethylene polyamine product is contacted with active carbon after first having essentially removed by distillation at least the ethylenediamine and the diethylenetriamine products.
Claim 5
Dependent Claim
47 words
In a process for decolorizing polyethylene polyamine products prepared by the reaction of ethylene dichloride with ammonia the improvement which comprises contacting in a continuous process with a fixed bed of active carbon a polyethylene polyamine product that contains a polyethylene polyamine represented by the following formula:
Claim 6
Dependent Claim
44 words
The process according to claim 6 wherein said temperature is in the range of about 190*C. to 210*C., and whereIn said flow rate is in the range of about 0.5 to about 0.7 gram of polyethylene polyamine per product gram of carbon per hour.
Claim 7
Dependent Claim
16 words
The process according to claim 7 wherein said polyethylene polyamine product comprises triethylenetetramine, tetraethylenepentamine and pentaethylenehexamine.
Claim 8
Dependent Claim
12 words
The process according to claim 8 wherein said polyethylene polyamine is triethylenetetramine.
Claim 9
Dependent Claim
31 words
The process according to claim 7 wherein said polyethylene polyamine product is contacted with active carbon after first having essentially removed by distillation at least the ethylenediamine and the diethylenetriamine products.
References Cited (Backward Citations)
US3056832A
Cited
US3595921A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |