Patent EP0147219A2 successfully refreshed from Google Patents.
EP0147219A2
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EP
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Pd/Re Hydrogenation catalyst and process for making tetrahydrofuran and 1,4-butanediol
Assignee: EIDP Inc
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Filing: 1984-12-21
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Granted: —
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Expires: 2004-12-21
Abstract
Abstract Palladium/rhenium-on-carbon catalyst; a method employing said catalyst to produce tetrahydrofuran, 1,4-butanediol or mixtures thereof in selectable ratios from a number of starting reactants; and a method for making the Pd/Re/C catalyst.
Inventors
- 👤 Melinda Ann Mabry
- 👤 William W. Prichard
- 👤 Stanislaw Bogdan Ziemecki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 11:29
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/04; C07D307/06; C07D307/08; B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/64; B01J23/656; B01J23/6567; C07C; C07C29/00; C07C29/17; C07C29/177
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
75 words
A catalyst composite of palladium and rhenium on a carbon support, the composite comprising about 0.5% to 10% of palladium and about 1% to 10% of rbenium by total weight, the palladium being present in the form of crystallites having an average size of about 10 nm to 25 nm and the rhenium being present in the form of a highly dispersed phase of crystallites having an average size of less than about 2.5 nm.
Claim 2
Dependent Claim
75 words
A catalyst composite of palladium and rhenium on a carbon support, the composite comprising about 0.5% to 10% of palladium and about 1% to 10% of rbenium by total weight, the palladium being present in the form of crystallites having an average size of about 10 nm to 25 nm and the rhenium being present in the form of a highly dispersed phase of crystallites having an average size of less than about 2.5 nm.
Claim 3
Independent Claim
75 words
A method for making a catalyst of palladium and rhenium on a carbon support comprising the steps, in sequence: (i) impregnating the carbon support with a source of palladium, said palladium being in solution. (ii) removing the solvent, and heating the palladium impregnated carbon at a temperature of about 150°C to 550°C under reducing conditions. (iii) applying to the palladium impregnated carbon a source of rhenium that is in solution, and (iv) removing the solvent.
Claim 4
Independent Claim
75 words
A method for making a catalyst of palladium and rhenium on a carbon support comprising the steps, in sequence: (i) impregnating the carbon support with a source of palladium, said palladium being in solution. (ii) removing the solvent, and heating the palladium impregnated carbon at a temperature of about 150°C to 550°C under reducing conditions. (iii) applying to the palladium impregnated carbon a source of rhenium that is in solution, and (iv) removing the solvent.
Claim 5
Dependent Claim
30 words
A method according to Claim 2 comprising the additional step of (v) heating the catalyst of step (iv) at a temperature of about 150°C to 5 50°C under reducing conditions.
Claim 6
Dependent Claim
25 words
A catalyst composite consisting essentially of palladium and rhenium deposited on a carbon support with the palladium having been reduced before the rhenium is deposited.
Claim 7
Dependent Claim
25 words
A catalyst composite consisting essentially of palladium and rhenium deposited on a carbon support with the palladium having been reduced before the rhenium is deposited.
Claim 8
Dependent Claim
93 words
A catalyst composite of palladium and rhenium on a carbon support, the composite comprising about 0.5% to 10% of palladium and about 1% to 10% of rhenium by total weight, made by the steps, in sequence, of: (i) impregnating the carbon support with a source of palladium, said palladium being in solution. (ii) removing the solvent and heating the palladium impregnated carbon at a temperature of about 150°C to 550°C under reducing conditions, (iii) applying to the palladium impregnated carbon a source of rhenium that is in solution, and (iv) removing the solvent.
Claim 9
Dependent Claim
93 words
A catalyst composite of palladium and rhenium on a carbon support, the composite comprising about 0.5% to 10% of palladium and about 1% to 10% of rhenium by total weight, made by the steps, in sequence, of: (i) impregnating the carbon support with a source of palladium, said palladium being in solution. (ii) removing the solvent and heating the palladium impregnated carbon at a temperature of about 150°C to 550°C under reducing conditions, (iii) applying to the palladium impregnated carbon a source of rhenium that is in solution, and (iv) removing the solvent.
Claim 10
Dependent Claim
32 words
A catalyst according to Claim 5 made by employing the additional step of (v) heating the catalyst composite of step (iv) at a temperature of about 150°C to 550°C under reducing conditions.
Claim 11
Dependent Claim
32 words
A method for making tetrahydrofuran, 1,4-butanediol or mixtures thereof comprising hydrogenating a hydrogenatable precursor in the presence of a solvent medium and a catalyst according to Claim 1, 4, 5, or 6.
Claim 12
Dependent Claim
86 words
In a method for making tetrahydrofuran, 1.4-butanediol or mixtures thereof from an oxidizable maleic anhydride precursor comprising oxidizing the precursor to form maleic anhydride and reacting the maleic anhydride with hydrogen in the presence of a hydrogenation catalyst, the improvement which comprises: (i) collecting the maleic anhydride from the oxidation step in water to form an aqueous solution of maleic acid, and (ii) reacting the aqueous solution of maleic acid with hydrogen in the presence of a catalyst according to Claim 1, 4, 5, or 6.
Claim 13
Dependent Claim
74 words
A method for making the catalyst of Claim 1, 4, 5, or 6 comprising the steps, in sequence: (i) impregnating the carbon substrate with a source of palladium, said palladium being in solution. (ii) removing the solvent, and heating the palladium impregnated carbon at a temperature of about 150°C to 550°C under reducing conditions. (iii) applying to the palladium impregnated carbon a source of rhenium that is in solution, and (iv) removing the solvent.
Claim 14
Dependent Claim
30 words
A method according to Claim 9 comprising the additional step of (v) heating the catalyst composite of step (iv) at a temperature of about 150°C to 550°C under reducing conditions.
References Cited (Backward Citations)
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