Patent US3935128A successfully refreshed from Google Patents.
US3935128A
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Copper chromite catalyst and the process for producing it
Assignee: Plastic Specialties and Technologies Inc
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Filing: 1974-12-30
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Granted: 1976-01-27
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Expires: 1994-12-30
Abstract
Abstract An improved copper chromite catalyst having high density, low monovalent ion content, high activity and resistance to poisoning is prepared by reacting a soluble copper salt with chromic acid or a dichromate in solution in the presence of ammonia and urea to precipitate a copper-chromium-nitrogen complex, washing, drying and calcining the precipitate.
Inventors
- 👤 Marvin Michael Fein
- 👤 Paul Alexander Colgate
- 👤 Ronald Allan Kent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:43
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01J23/868
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
94 words
In a process for the production of copper chromite catalyst wherein a water soluble copper salt is reacted in solution with a chromium compound selected from the group consisting of chromic acid, an alkali chromate and an alkali dichromate in the presence of ammonia to form a precipitate of a copper-chromium-nitrogen complex, the precipitate is recovered from the reaction mixture, washed, dried and calcined, the improvement which comprises, adding between about 0.5 and about 5 percent by weight of urea based on the copper calculated as the metal to the solution prior to precipitation.
Claim 2
Dependent Claim
94 words
In a process for the production of copper chromite catalyst wherein a water soluble copper salt is reacted in solution with a chromium compound selected from the group consisting of chromic acid, an alkali chromate and an alkali dichromate in the presence of ammonia to form a precipitate of a copper-chromium-nitrogen complex, the precipitate is recovered from the reaction mixture, washed, dried and calcined, the improvement which comprises, adding between about 0.5 and about 5 percent by weight of urea based on the copper calculated as the metal to the solution prior to precipitation.
Claim 3
Dependent Claim
33 words
The process of claim 1 wherein the proportions of copper salt and chromium compound are selected to provide a copper to chromium atomic ratio in the range between about 0.8:1 and about 2.5:1.
Claim 4
Dependent Claim
30 words
The process of claim 1 wherein the soluble copper salt is selected from the group consisting of copper sulfate, copper chloride, copper nitrate, copper phosphate, copper carbonate and copper acetate.
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein the copper salt is a copper nitrate.
Claim 6
Dependent Claim
26 words
The process of claim 1 wherein the chromium compound is an alkali dichromate selected from the group consisting of sodium dichromate, potassium dichromate and ammonium dichromate.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein the chromium compound is sodium dichromate.
Claim 8
Dependent Claim
33 words
The process of claim 1 wherein the proportions of copper salt and chromium compound are selected to provide a copper to chromium atomic ratio in the range between about 1:1 and about 1.5:1.
Claim 9
Dependent Claim
20 words
The process of claim 1 wherein the temperature of the reaction mixture is maintained between about 60°C and about 90°C.
Claim 10
Dependent Claim
22 words
The process of claim 1 wherein prior to recovery of the precipitate the reaction mixture is digested for at least 20 minutes.
Claim 11
Dependent Claim
34 words
The process of claim 1 wherein the reaction is carried out in the presence of sufficient amount of ammonia to maintain the reaction mixture in a pH range from about 5 to about 10.
Claim 12
Dependent Claim
23 words
The process of claim 1 wherein the precipitate is washed in more than one step by reslurrying it under agitation in deionized water.
Claim 13
Dependent Claim
16 words
The process of claim 10 wherein the pH is maintained between about 5.5 and about 7.
Claim 14
Dependent Claim
110 words
An improved copper chromite catalyst composition prepared by washing, drying and calcining the copper-chromium-nitrogen complex obtained in the process which comprises reacting in solution and in the presence of ammonia a. a water-soluble copper salt selected from the group consisting of copper sulfate, copper chloride, copper nitrate, copper phosphate, copper carbonate and copper acetate; b. a chromium compound selected from the group consisting of chromic acid, alkali chromate and alkali dichromate in an amount to provide a copper to chromium atomic ratio in the range between about 0.8:1 and about 2.5:1. c. from about 0.5 to about 5 percent by weight urea based on the copper calculated as the metal.
Claim 15
Dependent Claim
110 words
An improved copper chromite catalyst composition prepared by washing, drying and calcining the copper-chromium-nitrogen complex obtained in the process which comprises reacting in solution and in the presence of ammonia a. a water-soluble copper salt selected from the group consisting of copper sulfate, copper chloride, copper nitrate, copper phosphate, copper carbonate and copper acetate; b. a chromium compound selected from the group consisting of chromic acid, alkali chromate and alkali dichromate in an amount to provide a copper to chromium atomic ratio in the range between about 0.8:1 and about 2.5:1. c. from about 0.5 to about 5 percent by weight urea based on the copper calculated as the metal.
Claim 16
Dependent Claim
13 words
The improved catalyst of claim 13 wherein the copper salt is copper nitrate.
Claim 17
Dependent Claim
26 words
The improved catalyst of claim 13 wherein the chromium compound is alkali dichromate selected from the group consisting of sodium dichromate, potassium dichromate and ammonium dichromate.
Claim 18
Dependent Claim
13 words
The improved catalyst of claim 13 wherein the chromium compound is sodium dichromate.
Claim 19
Dependent Claim
34 words
The improved catalyst of claim 13 wherein the proportions of copper salt and chromium compound are selected to provide a copper to chromium atomic ratio in the range between about 1:1 and about 1.5:1.
References Cited (Backward Citations)
US2089433A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |