Catalytic cracking method for producing low-carbon olefins and light aromatic hydrocarbons
A technology for catalytic cracking and low-carbon olefins, applied in the treatment of hydrocarbon oil, hydrocarbon oil treatment products, petroleum industry, etc., can solve the problems of limited and increased light aromatic yield, etc., and achieve high BTX yield, reduced selectivity, high efficiency The effect of conversion
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[0072] The present invention also provides a method for preparing the catalytic cracking catalyst, comprising preparing the phosphorus-containing and metal-loaded IMF structure molecular sieve, and combining the obtained phosphorus-containing and metal-loaded IMF structure molecular sieve with Y-type molecular sieve, natural minerals , the precursor sol of oxide is mixed and beaten, and spray-dried; wherein the preparation method of phosphorus-containing and metal-loaded IMF structure molecular sieves comprises:
[0073] a. Desiliconizing the sodium-type IMF structure molecular sieve in an alkaline solution to obtain a desiliconization molecular sieve; b. performing an ammonium exchange treatment on the desilication molecular sieve obtained in step a to obtain an ammonium exchange molecular sieve; The total dry basis weight of the ammonium-exchanged molecular sieve is a benchmark, and the sodium content of the ammonium-exchanged molecular sieve is less than 0.2 weight %; dealu...
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[0122] according to figure 1 The process is tested, the feed oil is vacuum distillate oil, MMC-2 catalyst is used, and the test is carried out on a medium-sized device. The three reactors are all operated under normal pressure. The hydrocracking tail oil enters the riser 1, and the reaction temperature is 580 ℃, reaction time 2.0 seconds, the weight ratio of regenerated catalyst and raw catalyst mixture (wherein the raw catalyst accounts for 20% by weight of the catalyst mixture) to raw oil is 10, and the weight ratio of water vapor to raw oil is 0.25 to carry out the cracking reaction , the reaction oil gas and water vapor and the unborn catalyst enter the cyclone separator from the reactor outlet.
[0123] Aromatic raffinate oil (saturated hydrocarbon content is 87% by weight) enters the bottom of the riser 2, and at a reaction temperature of 625°C and a reaction time of 1.8 seconds, the weight ratio of the regenerated catalyst to the feedstock oil is 15, and the weight rati...
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