A catalyst for converting alcohol ethers into p-xylene and C2-C3 olefins and its preparation method
A C2-C3, p-xylene technology, applied in the chemical field, can solve the problems of low xylene selectivity, many alkanes, inability to convert, etc., and achieves the effects of cheap raw materials, reduced preparation cost, and not easy to fall off
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Embodiment 1
[0027] 0.2mol / L zinc nitrate was impregnated on ZSM-5 molecular sieve, dried at 110°C for 2 hours, and finally calcined at 700°C for 2 hours. The ZSM-5 molecular sieve loaded with zinc is immersed in the mixture of magnesium nitrate, iron nitrate and silane, treated at 20°C for 0.5 hours, then washed and filtered, dried at 90°C for 24 hours, and then calcined at 350°C for 24 hours to obtain The final product. The mass ratio of iron oxide: magnesium oxide and silicon oxide in the composite oxide layer (the three are evenly mixed) is 1:1:1. The mass ratio of ZSM-5, zinc and composite oxide layer in the catalyst is 30:10:59.
[0028] Use 100% methanol as the reaction raw material, control the reactor pressure to 0.1MPa, and methanol space velocity to 0.2h -1 , the temperature is 520°C, after methanol passes through the catalyst bed, the conversion rate is >99.9%, the total aromatics (carbon-based) yield reaches 70%, and the ratio of p-xylene in xylene is >92%. Ethylene / ethane ...
Embodiment 2
[0030] 2mol / L silver nitrate was impregnated on ZSM-5 molecular sieve, dried at 90°C for 24 hours, and finally calcined at 600°C for 10 hours. Immerse silver-loaded ZSM-5 molecular sieves in magnesium chloride, ferric chloride, and ethyl orthosilicate at 50°C for 0.5 hours, then wash and filter, dry at 100°C for 2 hours, and then roast at 500°C for 4 hours to obtain the final product . The mass ratio of iron oxide: magnesium oxide and silicon oxide in the composite oxide layer (the three are evenly mixed) is 10:60:30. The mass ratio of ZSM-5, silver and composite oxide layer is 40:1:39.
[0031] Use 100% dimethyl ether as the reaction raw material, control the pressure of the reactor to 3MPa, and the space velocity of dimethyl ether to 20h -1 . The temperature is 450°C. After dimethyl ether passes through the catalyst bed layer, the conversion rate>99.9%, the total (carbon-based) yield of aromatics reaches 75%, the ratio of p-xylene in xylene>93%, and ethylene / ethane (mass...
Embodiment 3
[0033] 1mol / L zinc acetate and 0.5mol / L cobalt nitrate were impregnated on ZSM-5 molecular sieves, dried at 100°C for 8 hours, and finally calcined at 650°C for 4 hours. Immerse the ZSM-5 molecular sieve loaded with zinc and cobalt in ferric chloride, magnesium chloride, and butyl orthosilicate at 20°C for 1 hour, wash, filter and dry at 110°C for 8 hours, and then roast at 550°C for 8 hours to obtain the final finished product. The mass ratio of iron oxide: magnesium oxide and silicon oxide in the composite oxide layer (the three are evenly mixed) is 30:69:1. The mass ratio of ZSM-5, zinc, cobalt and composite oxide layer is 51:3:7:39.
[0034] With 50% methanol, 40% dimethyl ether, and 10% formic acid as the reaction raw materials, the pressure in the control reactor is 0.3MPa, and the space velocity of dimethyl ether is 10h -1 . The temperature is 500°C. After the reaction raw materials pass through the catalyst bed, the alcohol ether conversion rate is >99.9%, the tota...
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