US4076649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of N-alkylated amines and catalyst therefor
Assignee: Hexcel Corp
•
Filing: 1976-04-02
•
Granted: 1978-02-28
•
Expires: 1996-04-02
Abstract
Abstract An improved supported thorium sulfate catalyst is prepared by converting a thorium compound impregnated in the carrier to thorium sulfate in situ. The improved catalyst is used in the production of N-alkylated amines, by contacting an alkanol with a primary or secondary amine, in the vapor phase.
Inventors
- 👤 Seymour Baron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:30
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/02; B01J27/053
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
78 words
A process for preparing a catalyst comprising an inert carrier impregnated with thorium sulfate, which comprises contacting said inert carrier with an aqueous solution of thorium nitrate to impregnate the inert carrier with thorium nitrate, heating the thus impregnated carrier to a temperature above about 150° C. for a time sufficient to allow said thorium nitrate to be converted to thorium oxide, and reacting said thorium oxide with sulfur trioxide to convert the thorium oxide to thorium sulfate.
Claim 2
Dependent Claim
78 words
A process for preparing a catalyst comprising an inert carrier impregnated with thorium sulfate, which comprises contacting said inert carrier with an aqueous solution of thorium nitrate to impregnate the inert carrier with thorium nitrate, heating the thus impregnated carrier to a temperature above about 150° C. for a time sufficient to allow said thorium nitrate to be converted to thorium oxide, and reacting said thorium oxide with sulfur trioxide to convert the thorium oxide to thorium sulfate.
Claim 3
Dependent Claim
100 words
A process for preparing a catalyst comprising an inert carrier impregnated with thorium sulfate, which comprises contacting the inert carrier with an aqueous solution of thorium nitrate to impregnate the inert carrier with thorium nitrate, heating the carrier to a temperature below the decomposition temperature of thorium nitrate to remove water therefrom, and converting the thorium nitrate to thorium sulfate by contacting the carrier impregnated with thorium nitrate with a mixture of concentrated sulfuric acid and an organic solvent, the ratio by volume of sulfuric acid to organic solvent being in the range of from about 5:1 to about 20:1.
Claim 4
Dependent Claim
100 words
A process for preparing a catalyst comprising an inert carrier impregnated with thorium sulfate, which comprises contacting the inert carrier with an aqueous solution of thorium nitrate to impregnate the inert carrier with thorium nitrate, heating the carrier to a temperature below the decomposition temperature of thorium nitrate to remove water therefrom, and converting the thorium nitrate to thorium sulfate by contacting the carrier impregnated with thorium nitrate with a mixture of concentrated sulfuric acid and an organic solvent, the ratio by volume of sulfuric acid to organic solvent being in the range of from about 5:1 to about 20:1.
Claim 5
Dependent Claim
11 words
The process according to claim 2, wherein the carrier is pumice.
Claim 6
Dependent Claim
12 words
The process according to claim 2, wherein the organic solvent is methanol.
References Cited (Backward Citations)
USRE18380E
Cited
US1657753A
Cited
US2113241A
Cited
GB410500A
Cited
US3732311A
Cited
US3885020A
Cited
FR2168716A5
Cited
US3939250A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |