Catalysts containing tungstate for the synthesis of alkyl mercaptan and method for the production thereof
View Patent ↗The invention relates to a catalyst containing alkali tungstate for the synthesis of alkylmercaptanes from alkanols and hydrogen sulphide, in addition to a method for the production of said catalyst, wherein the molar ratio of alkali to tungsten is <2:1.
1. A catalyst comprising a catalytically active tungstate having the general formula A x WO y , where A: is at least one alkali metal selected from the group consisting of potassium and cesium, x: is 0.9 to <2 and y: is 3.4 to <4, where cesium, if present, is combined with another alkali metal and where the alkali metal to tungsten molar ratio is <2:1.
2. The catalyst according to claim 1 , wherein the alkali metal to tungsten molar ratio is <2:1 to 0.9:1.
3. The catalyst according to claim 2 , wherein the alkali metal to tungsten molar ratio is 1.9:1 to 1:1.
4. The catalyst according to claim 3 , wherein the alkali metal to tungsten molar ratio is 1.6:1 to 1:1.
5. The catalyst according to claim 1 , comprising the tungstate in an amount of 8 to 45% by weight.
6. The catalyst according to claim 5 , comprising the tungstate in an amount of 15 to 36% by weight.
7. The catalyst according to claim 6 , comprising the tungstate in an amount >25 to 36% by weight.
8. The catalyst according to claim 1 , comprising potassium and cesium.
9. The catalyst according to claim 8 , wherein the alkali metal to tungsten molar ratio is <2:1 to 0.9:1.
10. The catalyst according to claim 9 , wherein the alkali metal to tungsten molar ratio is 1.9:1 to 1:1.
11. The catalyst according to claim 10 , wherein the alkali metal to tungsten molar ratio is 1.6:1 to 1:1.
12. The catalyst according to claim 1 , wherein potassium is the only alkali metal.
13. The catalyst according to claim 12 , wherein the alkali metal to tungsten molar ratio is <2:1 to 0.9:1.
14. The catalyst according to claim 13 , wherein the alkali metal to tungsten molar ratio is 1.9:1 to 1:1.
15. The catalyst according to claim 14 , wherein the alkali metal to tungsten molar ratio is 1.6:1 to 1:1.