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US 2022/0193643 A1Published application
Process and catalyst to convert methanol and toluene to styrene
AssigneeExelus, Inc.
InventorsMitrajit Mukherjee, Vamsi Vadhri
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Abstract
The invention provides methods, catalysts and systems for producing styrene from DME and toluene. Zeolite catalysts comprising potassium, rubidium or cesium and containing at least 0.1 wt % B are described. Methods of making the catalysts are also described.
Claims25
A method of producing styrene, comprising:
- passing dimethyl-ether (DME) and toluene into a reaction chamber;
- wherein the reactor comprises a zeolite X or zeolite Y wherein 50-80% of the exchangeable sodium in the zeolite is replaced by Group 1 alkali metal salts of potassium, rubidium or cesium and contains at least 0.1 wt % or at least 0.2 wt % or in the range of 0.1 to 1 wt % B;
- and
- reacting the DME and the toluene in the reaction chamber in the presence of the catalyst to make styrene under steady state conditions.
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A catalyst for producing styrene from DME and toluene,
- wherein the catalyst comprises zeolite X or zeolite Y;
- wherein 50% of the exchangeable sodium in the zeolite is replaced by Group 1 alkali metal salts of potassium, rubidium or cesium and contains at least 0.1 wt % or at least 0.2 wt % B.
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A method of making a catalyst, comprising:
- providing a zeolite comprising zeolite X or zeolite Y having a Si/Al ratio in the range of 1.0 to 10;
- conducting an ion exchange with K, Rb, or Cs to remove 50-80% of Na;
- impregnating the resulting zeolite with 0.5 to 5 wt % boric acid (based on the weight of zeolite);
- and drying the impregnated zeolite.
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Dependencies are inferred from the claim text.