Hydrocarbons catalytic conversion method for preparing low olefin-content gasoline

Abstract

The invention relates to a hydrocarbon catalytic conversion method for preparing gasoline with low alkene, wherein, in a reactor comprising a mixing area, a first reaction area and a second reaction area, regenerated catalyst and steam stripped charcoal catalyst enter into the mixing area and are mixed together, and flow upward and enter into the first reaction area under the action of a pre-lifted medium; the mixture contacts and reacts with catalyzing materials at the lower part of the first reaction area and flows upward; the generated oil agent mixture enters into the second reaction areaand continue to contact and react fully; the oil agent mixture coming out from the second reaction area enters in a settler through a outlet area of the reactor to perform gas-solid separation, the charcoal catalyst after reaction enters into a stripper section of the settler for steam stripping; at lest one part of the steam stripped charcoal catalyst returns to the mixing area for cycling use, and the remained steam stripped charcoal catalyst is regenerated in a regenerator and then enters into the mixing area for cycling use; the reaction oil-gas after separating the charcoal catalyst is sent to a follow-up product separating system. Under the condition of low dry gas yield, the catalytic gasoline with low alkene can be produced by the method.

Description

technical field [0001] The present invention pertains to a process for the catalytic cracking of hydrocarbon oils in the absence of hydrogen. Background technique [0002] With the increasingly stringent requirements of environmental protection regulations on the quality of gasoline products, gasoline has developed from unleaded gasoline to reformulated gasoline. The standard of reformulated gasoline is to limit the vapor pressure and benzene content of gasoline, while limiting the content of aromatics and olefins. [0003] Based on this, ZL99105903.4 discloses a fluidized catalytic conversion variable-diameter riser reactor with two reaction zones. ZL99105904.2 discloses a catalytic conversion method for producing isobutane and isoparaffin-rich gasoline; ZL99105905.0 discloses a catalytic conversion method for producing propylene, isobutane and isoparaffin-rich gasoline . The common point of the two methods is that they both make full use of the gas-solid contact of the c...

AI Technical Summary

Problems solved by technology

However, the disadvantages of these two methods are: on the one hand, the first reaction zone is still in contact with the raw material oil and the high-temperature regenerated catalyst, which inevitably leads to the generation of higher dry gas yield; on the other hand, limited by the heat balance of the anti-regeneration system, The temperature of the regenerated catalyst and the outlet temperature of the riser reactor are limited, resulting in a relatively limited circulation of the catalyst in the second reaction zone, and a relatively low gas-solid contact efficiency, which affects the function of the second reaction zone

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