Patent US4106061A successfully refreshed from Google Patents.
US3888845A
Expired / Lapsed
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Process for producing epsilon-caprolactam
Assignee: Teijin Ltd
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Filing: 1971-03-05
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Granted: 1975-06-10
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Expires: 1991-03-05
Abstract
Abstract Epsilon-caprolactam is prepared without the formation of byproduct ammonium sulfate by contacting at least one of Epsilon caprolactone or a C1-4 lower alkyl ester of Epsilon hydroxycaproic acid, hydrogen and ammonia in the vapor phase at 200* to 320*C. with a solid catalyst comprising (A) at least one oxide selected from titanium dioxide, alumina, aluminasilica and silica, and (B) metallic copper. Optionally the catalyst contains metallic nickel and/or chromium sesquioxide.
Inventors
- 👤 Yutaka Fujita
- 👤 Tatsuyuki Naruchi
- 👤 Eishin Yoshisato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:36
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/90; B01J23/94; B01J23/70; B01J23/74; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01J23/868; C; C07; C07D; C07D201/00; C07D201/02; C07D201/08; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y02P20/582; Y02P20/584
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
39 words
A PROCESS FOR PRODUCING $-CAPROLACTAM WHICH COMPRISES CONTACTING AT LEAST ONE COMPOUND SELECTED FROM $CAPROLACTONE AND C1=C4 LOWER ALKYL ESTERS OF $HYDROXYCAPROIC ACID WITH HYDROGEN AND AMMONIA IN THE VAPOR PHASE AT A TEMPERATURE OF 200* TO 320:C, WIT
Claim 2
Dependent Claim
39 words
A PROCESS FOR PRODUCING $-CAPROLACTAM WHICH COMPRISES CONTACTING AT LEAST ONE COMPOUND SELECTED FROM $CAPROLACTONE AND C1=C4 LOWER ALKYL ESTERS OF $HYDROXYCAPROIC ACID WITH HYDROGEN AND AMMONIA IN THE VAPOR PHASE AT A TEMPERATURE OF 200* TO 320:C, WIT
Claim 3
Dependent Claim
27 words
The process of claim 1, wherein said solid catalyst contains 100 parts by weight of said oxide and 0.5 to 200 parts by weight of metallic copper.
Claim 4
Dependent Claim
36 words
The process of claim 1, wherein said solid catalyst comprises particles or agglomerated particles of said oxide having a particle size of 5 to 100 microns, and metallic copper deposited on the surfaces of said particles.
Claim 5
Dependent Claim
17 words
A process of claim 1, wherein said solid catalyst comprises anatase type titanium dioxide and metallic copper.
Claim 6
Dependent Claim
82 words
The process of claim 1, wherein said solid catalyst is prepared by dispersing said oxide in an aqueous solution of a copper compound or an aqueous suspension of the copper compound, precipitating the copper compound when the aqueous solution of copper compound is used, separating a mixture of solid copper compound and the oxide from the aqueous medium, calcining the mixture at 200*-600*C., and reducing the mixture until at least the surface of said copper compound is substantially converted to metallic copper.
Claim 7
Dependent Claim
96 words
The process of claim 1, wherein said solid catalyst consists of A. 100 parts by weight of at least one oxide selected from the group consisting of titanium dioxide, alumina, alumina-silica and silica, B. metallic copper, and C. a component selected from metallic nickel, chromium sesquioxide and mixtures thereof, the sum of the amounts of the metallic copper (B) and metallic nickel, chromium sesquioxide or mixture thereof (C) being 0.5 to 200 parts by weight, and the atomic ratio of component (C), as nickel, chromium or mixture thereof, to metallic copper (B) being 0.001 to 1:1.
Claim 8
Dependent Claim
37 words
The process of claim 1, wherein at least one of epsilon -caprolactone or C1 - C4 alkyl esters of epsilon -hydroxycaproic acid, hydrogen, ammonia are contacted with said solid catalyst in the vapor phase together with water.
Claim 9
Dependent Claim
42 words
The process of claim 1, wherein per mole of epsilon -caprolactone or said esters of epsilon -hydroxycaproic acid, a. 5 to 70 moles of hydrogen, b. 1 to 50 moles of ammonia, and c. 0 to 50 moles of water are used.
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) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |