Method for Improving the Selectivity of Aromatics in Methanol-to-Aromatics Process
A selective and aromatics technology, applied in chemical instruments and methods, chemical/physical processes, and hydrocarbon production from oxygen-containing organic compounds, can solve the problem of low selectivity of aromatics
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Embodiment 1
[0027] In the fluidized bed reactor with guide baffles, the methanol raw material and the modified ZSM-5 molecular sieve catalyst contact and react to generate products including aromatics; the temperature of each point in the reactor is 440 ° C, the reaction pressure is normal pressure, and the methanol Weight airspeed at 0.2 hours -1 , the catalyst bed density is 450 kg / m3, the residence time of raw materials in the catalyst bed is 30 seconds, and the residence time-catalyst bed density compensation factor is 13.5×10 3 Second Kilogram / Cubic Meter.
[0028]The diversion baffle is a porous baffle, the opening ratio of the porous baffle is 10%, and the catalyst slip coefficient at the opening layer is 1.01. The number of perforated baffles is 1, and the height is 300 mm. The distance between the porous baffle and the bottom of the dense phase section of the fluidized bed reactor is 0.8 times the height of the dense phase section of the entire fluidized bed reactor.
[0029] ...
Embodiment 2
[0031] According to the method and steps of Example 1, the methanol raw material and catalyst of Example 1 were used. The temperature of each point in the reactor is 550°C, the reaction gauge pressure is 0.1 MPa, and the weight space velocity of methanol is 4 hours -1 , the catalyst bed density is 200 kg / m3, the residence time of the raw material in the catalyst bed is 5 seconds, and the residence time-catalyst bed density compensation factor is 1×10 3 Second Kilogram / Cubic Meter.
[0032] The guide baffle is a slanted guide baffle with blades, the acute angle between the guide vanes and the horizontal direction of the guide slant baffles with blades is 85°, and the distance between adjacent guide vanes is 1 / 2 of the diameter of the fluidized bed reactor 1 / 1000. The number of inclined guide baffles with blades is 20, and they are distributed along the axial direction of the fluidized bed reactor. The height of the baffles is all 15 mm, and the distance between each baffle i...
Embodiment 3
[0034] According to the method and steps of Example 1, the methanol raw material and catalyst of Example 1 were used. The temperature of each point in the reactor is 470°C, the reaction gauge pressure is 0.5 MPa, and the weight space velocity of methanol is 4 hours -1 , the catalyst bed density is 400 kg / m3, the residence time of the raw material in the catalyst bed is 15 seconds, and the residence time-catalyst bed density compensation factor is 2.45×10 3 Second Kilogram / Cubic Meter.
[0035] The guide baffle is a grille baffle. The number of grille baffles is 3. The height of the top grill baffle is 30 mm, and the equivalent diameter of the grill square holes is 5 mm. The heights of the middle and bottom grille baffles are both 20mm, and the equivalent diameter of the grille square holes is 50mm. The distance between the uppermost and middle grid baffles is 0.4 times the height of the dense phase section of the entire fluidized bed reactor, and the distance between the m...
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