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US 11,834,385 B2Granted
Method for producing N-methyl-p-toluidine for use as an additive for aviation gasoline
AssigneeLANXESS Corporation
InventorsMartina Gerdinand, Rainer Dost, Ralf Krahwinkel, Hans-Jurgen Quella, Daniel Ullrich, Patrick Kurr
Life of this patent
Estimating the term…
Abstract
The invention relates to novel methods for preparing N-methyl-p-toluidine for the use thereof as additive for aviation fuel, and to specific catalysts for these methods.
Claims2
A method for producing a catalyst containing Cu, Zn and Al, comprising:
- adding an aqueous sodium carbonate solution and a mixture of aqueous copper nitrate and zinc nitrate solution to an aqueous suspension of aluminum oxide, while maintaining a pH of 7.5-8.5, at a temperature of 60-80° C., wherein the mixture of aqueous copper nitrate and zinc nitrate solution is adjusted before the addition to a pH of <1, the resulting suspension containing Cu, Zn and Al is subsequently washed, then dried, the solid obtained therefrom is calcined.
A method for producing a catalyst comprising Cu, Zn and Al comprising:
- adding an aqueous sodium carbonate solution and a mixture of aqueous copper nitrate and zinc nitrate solution to an aqueous suspension of aluminum oxide, while maintaining a pH of 7.9-8.1, at a temperature of 65-75° C., wherein the mixture of aqueous copper nitrate and zinc nitrate solution is adjusted before the addition to a pH of 0.4-0.6 (at 20° C.), the resulting suspension comprising Cu, Zn and Al is subsequently washed, then dried, the solid obtained therefrom is calcined and tabletted.
Dependencies are inferred from the claim text.