Fluid catalytic cracking of petroleum oil with reduced emissions

A system for fluid catalytic cracking (FCC) of petroleum oil feedstock, the system comprising:

• a reaction zone for reacting the petroleum oil feedstock with a catalyst mixture in a reaction zone of an FCC unit to obtain a product stream comprising desulfurized hydrocarbon product, unreacted petroleum oil feedstock, and spent catalyst, the catalyst mixture comprising:
• a base cracking catalyst comprising a stable Y-type zeolite and a rare earth metal oxide, and
• an FCC additive comprising a shape selective zeolite;
• process sensors for collecting, during a reaction in the reaction zone, data indicative of one or more of (i) a feed rate of one or more of the base cracking catalyst into the reaction zone, the FCC additive into the reaction zone, or the petroleum oil feedstock, (ii) operating conditions of the reaction in the reaction zone, or (iii) a composition of the product stream;
• an emissions sensor for collecting data indicative of emissions from the FCC reaction;
• and
• a process control system comprising one or more processors coupled to a memory, the memory storing instructions that, when executed by the one or more processors, cause the processors to:
• develop, during the reaction in the reaction zone, a process model based on at least some of the data collected by the process sensors and the data collected by the emissions sensor, in which the process model characterizes a relationship among the feed rate of the base cracking catalyst, the feed rate of the FCC additive, the operating conditions, the composition of the product stream, and emissions from the FCC reaction;
• based on a comparison between at least some of the collected data and one or more of the developed process models, determine, during the reaction in the reaction zone, one or more of (i) a target feed rate of the base cracking catalyst, (ii) a target feed rate of the FCC additive, and (iii) one or more target operating conditions of the reaction in the reaction zone to reduce the emissions from the FCC unit and to increase a yield of the desulfurized hydrocarbon product in the product stream;
• and
• control adjustment of one or more of (i) the feed rate of the base cracking catalyst according to the determined target feed rate of the base cracking catalyst, (ii) the feed rate of the FCC additive according to the determined target feed rate of the FCC additive, or (iii) the operating conditions according to the determined one or more target operating conditions.