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
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[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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