Method for catalytically converting methanol to low-carbon olefins
A low-carbon olefin, catalytic conversion technology, applied in the direction of hydrocarbon cracking, hydrocarbon production from oxygen-containing organic compounds, chemical recovery, etc., can solve the problem of low yield of low-carbon olefins, achieve high conversion rate, improve low-carbon Olefin selectivity and the effect of improving selectivity
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Embodiment 1
[0020] in such as figure 1On the shown reaction device, the pure methanol raw material enters the gas-solid distribution zone 19 through the pipeline 20 and then enters the down-bed reaction zone 18, and contacts with the SAPO-34 catalyst to generate a gas phase stream comprising light olefins and carbon tetraolefins and the catalyst enters the crude Cyclone 17, coarse cyclone 17 gas phase outlet is connected with the cyclone separator 21 inlet in the settler 16, and the gas phase stream enters the separation section from the cyclone separator 21 gas phase outlet, and is separated to obtain low-carbon olefin products and carbon four or more including carbon four olefins The hydrocarbon stream, the catalyst separated by the coarse cyclone 17 and the cyclone separator 21 enters the regenerator 3 through the standby standpipe 6 after settling and stripping, and the regenerated catalyst enters the riser reaction zone 11 through the regeneration inclined pipe 7, and The hydrocarbon...
Embodiment 2
[0024] According to the conditions and steps described in Example 1, the methanol raw material with a purity of 81% (the rest is water) enters the gas-solid distribution zone 19 through the pipeline 20 and then enters the down-bed reaction zone 18. The feed to the riser 11 is a hydrocarbon stream with more than four carbons including carbon four olefins, wherein the mass content of the carbon four olefins is 88%. The reaction conditions of the riser reaction zone 11 are: the reaction temperature is 600 ° C, and the reaction pressure is 0.01 in gauge pressure. MPa, the gas phase velocity is 12 m / s; the down-bed reaction 18 reaction conditions are: the reaction temperature is 530°C, the reaction pressure is 0.01MPa in terms of gauge pressure, and the gas phase velocity is 10 m / s. The average carbon deposition mass fraction of the regenerated catalyst is 0.5%, and two feed ports are arranged in the axial direction of the riser reaction zone 11, and the two feed ports are respectiv...
Embodiment 3
[0026] According to the conditions and steps described in Example 1, the riser 11 feed is a hydrocarbon stream with more than four carbons including carbon four olefins, wherein the mass content of carbon four olefins is 88%, and the reaction conditions of the riser reaction zone 11 are: the reaction temperature is 550°C, the reaction pressure is 0.01MPa by gauge pressure, and the gas phase velocity is 7 m / s; the reaction conditions of the down-bed reaction 18 are: the reaction temperature is 465°C, the reaction pressure is 0.01MPa by gauge pressure, and the gas phase velocity is 7 m / s. The average carbon deposition mass fraction of the regenerated catalyst is 0.12%, and three feed ports are arranged in the axial direction of the riser reaction zone 11, and the three feed ports are respectively located at 1 / 3 / , 1 / 2, 2 At the height of / 3 reaction zone, the mass ratio of methanol and carbon tetraolefins entering the axial feed port is 1:1. The reaction product was analyzed by ...
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