Hydrocarbons catalytic conversion method for preparing low olefin-content gasoline

A catalytic conversion method and low olefin technology, which are applied in the field of catalytic cracking, can solve the problems such as the limitation of the outlet temperature of the riser reactor, the effect of the second reaction zone, and the limited circulation of the catalyst, so as to reduce the olefin content and reduce the olefin content. , the effect of reducing the proportion of thermal cracking

Active Publication Date: 2008-06-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
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  • Claims
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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

Method used

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  • Hydrocarbons catalytic conversion method for preparing low olefin-content gasoline

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Embodiment

[0027] This example illustrates the use of the method provided by the present invention for the catalytic conversion of hydrocarbon oil to produce propylene.

[0028] The flow chart of the medium-sized catalytic cracking unit is shown in the figure. The vacuum gas oil is injected into the first reaction zone of the variable-diameter riser reactor via line 7 and contacts and reacts with the mixed catalyst lifted by steam in the lower part of the first reaction zone. The mixed catalyst is made by mixing the 500°C carbon-carrying catalyst and the 680°C regenerated catalyst returned from the stripping section of the settler in the mixing zone 3 at a weight ratio of 0.15:1, and the bed density in the mixing zone is 200kg / m 3 . The weight ratio of catalyst and vacuum gas oil in the first reaction zone is 8.4:1, the residence time of vacuum gas oil in the first reaction zone is 1 second, the temperature in the first reaction zone is 520℃, and the oil mixture continues Go up into the sec...

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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 area and 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 invention belongs to a method for catalytic cracking of hydrocarbon oil 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 evolved from unleaded gasoline to newly formulated gasoline. The standard for newly formulated 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 preparing isobutane and gasoline rich in isoparaffins; ZL99105905.0 discloses a catalytic conversion method for preparing propylene, isobutane and gasoline rich in isoparaffins . The common point of the two methods is that they both make full use of the gas-solid contact of the catalyst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G11/02
Inventor 龚剑洪许友好张久顺龙军
Owner CHINA PETROLEUM & CHEM CORP
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