Patent EP0778085A1 successfully refreshed from Google Patents.
EP0778085A1
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EP
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Method of activating or regenerating a catalyst used in the production of hydrogen peroxide
Assignee: Nouryon Pulp and Performance Chemicals AB
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Filing: 1996-11-18
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Granted: —
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Expires: 2016-11-18
Abstract
Abstract The invention relates to a method of activating a catalyst for hydrogenation of anthraquinones or derivatives thereof used in production of hydrogen peroxide comprising the step of treating the catalyst with an acid. The invention also relates to a method of producing hydrogen peroxide.
Inventors
- 👤 Mats Nyström
- 👤 Mikael Siverström
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 19:23
CPC Classifications
B; B01; B01J; B01J38/00; B01J38/48; B01J38/60; B01J23/00; B01J23/90; B01J23/96; B01J37/00; B01J37/06; C; C01; C01B; C01B15/00; C01B15/01; C01B15/022; C01B15/023; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
34 words
A method of activating a catalyst for hydrogenation of anthraquinones or derivatives thereof used in production of hydrogen peroxide, characterised in that the method comprises the step of treating the catalyst with an acid.
Claim 2
Dependent Claim
22 words
A method as claimed in claim 1, characterised in that the catalyst is treated with nitric acid, sulfuric acid or phosphoric acid.
Claim 3
Independent Claim
27 words
A method as claimed in any one of the claims 1-2, characterised in that the catalyst is contacted with the acid for more than about 5 minutes.
Claim 4
Independent Claim
28 words
A method as claimed in any one of the claims 1-3, characterised in that the catalyst is first treated with an organic solvent and then with an acid.
Claim 5
Dependent Claim
24 words
A method as claimed in claim 4, characterised in that the organic solvent is selected from aromatic, aliphatic or naphtenic hydrocarbons, or mixtures thereof.
Claim 6
Independent Claim
23 words
A method as claimed in any one of the claims 1-5, characterised in that the acid treatment is followed by washing with water.
Claim 7
Independent Claim
31 words
A method as claimed in any one of the claims 1-6, characterised in that the catalyst comprises an active material selected from nickel, palladium, platinum, rhodium or ruthenium, or mixtures thereof.
Claim 8
Independent Claim
23 words
A method as claimed in any one of the claims 1-7, characterised in that the catalytically active material is attached to a carrier.
Claim 9
Independent Claim
44 words
A method as claimed in any one of the claims 1-8, characterised in that the catalyst that is activated has been used for hydrogenation of anthraquinones or derivatives thereof in production of hydrogen peroxide and thereby lost an unsatisfactory deal of its original activity.
Claim 10
Independent Claim
53 words
A method of producing hydrogen peroxide according to the anthraquinone process involving alternate oxidation and hydrogenation of anthraquinones or derivatives thereof in a working solution of organic solvents in the presence of a catalyst, characterised in that the method involves activation of the hydrogenation catalyst according to any one of the claims 1-9.
References Cited (Backward Citations)
US3009782A
Cited
FR1427928A
Cited
US3901822A
Cited
US4552748A
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US4428923A
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US4800074A
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US4800073A
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US5071634A
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US5063043A
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EP0670182A1
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