Propylene oxide process using mixed precious metal catalyst supported on alkaline earth metal carbonate
AssigneeArco Chemical Technology, L.P.
InventorsAnne M. Gaffney, Andrew P. Kahn, Rangasamy Pitchai
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Abstract
Propylene is oxidized to propylene oxide in the vapor phase using oxygen and a supported catalyst comprising silver, gold, a potassium promoter such as potassium nitrate or potassium carbonate and a support comprised in whole or in substantial part of an alkaline earth metal carbonate.
Claims20
A process for producing propylene oxide wherein a feedstream comprising oxygen and propylene is contacted in the vapor phase at a temperature of 180.degree. C. to 350.degree. C. with a supported catalyst comprising
- (a) a support comprising an alkaline earth metal carbonate;
- (b) a catalytically effective amount of silver;
- (c) an amount of gold effective to improve selectivity to propylene oxide, wherein said gold is derived from a gold compound selected from the group consisting of gold hydroxide, gold carboxylates and mixtures thereof;
- and
- (d) a promoting amount of a potassium promoter derived from a potassium salt comprising potassium cation and an anion selected from carbon oxyanions, nitrogen oxyanions and precursors thereof.
A process for producing propylene oxide wherein a feedstream comprising oxygen and propylene is contacted in the vapor phase at a temperature of 200.degree. C. to 300.degree. C. with a supported silver catalyst comprising
- (a) a support comprising calcium carbonate;
- (b) from 5 to 50 percent, based on the total weight of supported catalyst, of silver;
- (c) from 1 to 10 weight percent, based on the total weight of supported catalyst, of gold, wherein said gold is derived from a gold compound selected from the group consisting of gold hydroxide, gold carboxylates, and mixtures thereof;
- and
- (d) from 0.5 to 3 percent by weight, calculated as potassium cation based on the total weight of supported silver catalyst, of a potassium promoter derived from a potassium salt selected from the group consisting of potassium carbonate, potassium bicarbonate, potassium nitrate, potassium nitrite and mixtures thereof.
A process for producing propylene oxide wherein a feedstream comprising oxygen and propylene and characterized by the absence of an organic halide is contacted in the vapor phase at a temperature of 180.degree. C. to 350.degree. C. with a supported catalyst comprising
- (a) a support comprising an alkaline earth metal carbonate;
- (b) a catalytically effective amount of silver;
- (c) an amount of gold effective to improve selectivity to propylene oxide;
- and
- (d) a promoting amount of potassium promoter derived from a potassium salt comprising potassium cation and an anion selected from carbon oxyanions, nitrogen oxyanions and precursors thereof.
A process for producing propylene oxide wherein a feedstream comprising oxygen and propylene and characterized by the absence of an organic halide is contacted in the vapor phase at a temperature of 200.degree. C. to 300.degree. C. with a supported silver catalyst comprising
- (a) a support comprising calcium carbonate;
- (b) from 5 to 50 percent, based on the total weight of supported catalyst, of silver;
- (c) from 1 to 10 weight percent, based on the total weight of supported catalyst, of gold;
- and
- (d) from 0.5 to 3 percent by weight, calculated as potassium cation based on the total weight of supported silver catalyst, of a potassium promoter derived from a potassium salt selected from the group consisting of potassium carbonate, potassium bicarbonate, potassium nitrate, potassium nitrite and mixtures thereof.
Dependencies are inferred from the claim text.