Method for selectively preparing propylene and clean gasoline through using methanol

Abstract

The invention relates to a method for selectively preparing propylene and clean gasoline through using methanol. The method comprises the following steps: methanol enters a double arc bottom turbulent bed reactor through a methanol feeding ring tube to contact and react with a catalyst at 300-500DEG C for 2-5s; an obtained gas enters a conveying bed reactor after reducing, wherein the gas retention time is 1-3s; the gas and the catalyst are separated by a cyclone separator in a settlement device, and the gas gets away off a reaction regeneration system separating system from the top of the settlement device to a separation system; the settled catalyst is added to a reactivator for scorching regeneration; and the regenerated catalyst returns to the double arc bottom turbulent bed reactor, and a pre-riser outlet is arranged on a cross section in which a highest nozzle outlet of the feeding ring tube. The methanol conversion rate is 99.48wt%, generated hydrocarbons contain higher-content gasoline, lower-content liquefied gas and lowest-content dry gas and coke, the content of propylene in the liquefied gas reaches 62.13%, and the content of ethylene in the dry gas reaches 82wt%.

Description

Technical field: [0001] The invention relates to a method for selectively producing propylene and clean gasoline from methanol. Background technique [0002] Mobil Corporation (Mobil) proposed a process using ZSM-5 catalyst to convert methanol to olefins in a tubular reactor, and conducted a 9-month pilot test in 1984, with a test scale of 100 barrels / sky. During the process, methanol diffuses into the pores of the catalyst to react, first to generate dimethyl ether, and then to generate ethylene, and the reaction continues to generate propylene, butene and higher olefins, as well as dimers and cyclic compounds. Based on selectivity, the yield of ethylene can reach 60% (weight), and the total yield of olefins can reach 80% (weight), which is roughly equivalent to twice the yield of conventional naphtha / gas oil tube furnace cracking. However, the life of the catalyst is not ideal. [0003] BASF (BASF) used zeolite catalysts and established a pilot plant with a daily consu...

AI Technical Summary

Problems solved by technology

While SPAO-34 is an ideal catalytic material, it is not a robust material for fluidized bed operation, and the binder selected increases catalyst strength and attrition resistance

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