Procedure in two stages to selectively produce c2 to c4 olefins from the hydrocarbon supply stock

摘要

PROCESS IN TWO STRATEGIES FOR SELECTIVELY PRODUCING C~2~A C~4~ OLEFINANS TO PART OF THE HIDROCARBON A CEO SUPPLY STAGE" A two-stage process for selective production of C~2~C~ to C~4~ olefins from a gas oilThe residue. Gas or waste oil is reacting at an early stage of a fluid catalytic cracking unit in which it is converted into the presence of large conventional zeolitical pore catalyst for reaction products.including a current in the boiling strip of naphtha. The current in the boiling range of naphtha is introduced into a second understood stage of a process unit containing a reaction zone, an extraction zone, a catalyst regeneration zone and a cracking zone. The flow of naphtha feed is contacted in the reaction zone with a catalyst containing about 10 to 50% by weight of a crystalline zeolite that has a mean porous diameter smaller than 0,7 nanometers in reaction conditions that include temperatures ranging from around 500 to 650.C and a partial hydro pressureCharcoal from about 0,7 to 2,8 bar absolute. Steam products are collected at the top and catalyst particles are passed through the extraction zone on the way to the catalyst regeneration zone. Volatiles are steam extracted in the extraction zone and catalyst particles are sent to the catalyst regeneration zone where the coke is burned from the catalystwhich is then recycled to the reaction zone.