US4376732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Niobium or tantalum catalysts for the preparation of ethylenimine
Assignee: Dow Chemical Co
•
Filing: 1981-07-09
•
Granted: 1983-03-15
•
Expires: 2001-07-09
Abstract
Abstract An improved catalyst suitable for the dehydration of an alkanolamine in the vapor phase to produce an alkylenimine which catalyst contains an oxide of niobium or tantalum. Optionally an alkaline earth oxide is employed as a promoter. The catalyst is generally used on an inert low surface area support at a concentration of less than 5% of the tantalum or niobium oxide and less than 0.5% of the promoter oxide.
Inventors
- 👤 Enrique G. Ramirez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:38
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
31 words
An improved process for dehydrating ethanolamine in the vapor phase to produce ethylenimine which comprises employing a supported catalyst of niobium or tantalum oxide together with an alkaline earth oxide promoter.
Claim 2
Dependent Claim
31 words
An improved process for dehydrating ethanolamine in the vapor phase to produce ethylenimine which comprises employing a supported catalyst of niobium or tantalum oxide together with an alkaline earth oxide promoter.
Claim 3
Dependent Claim
31 words
The process of claim 1 wherein the niobium or tantalum oxide is present at a concentration of from about 0.5 to about 5% based on total weight of catalyst and support.
Claim 4
Dependent Claim
16 words
The process of claim 2 wherein barium oxide is present as a promoter for the catalyst.
Claim 5
Dependent Claim
27 words
The process of claim 2 wherein the alkaline earth oxide promoter is present in amount of from 0.1 to 0.5% based on the niobium or tantalum oxide.
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) | 1986-03-14 | 1986-09-13 | 1987-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-14 | 1990-09-13 | 1991-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-14 | 1994-09-13 | 1995-03-15 | $7700.00 | Window Closed / Lapsed |