Fluidized catalytic cracking process and apparatus for maximizing light olefin yield and other applications

Abstract

Apparatuses and processes of the present disclosure provide for the conversion of hydrocarbon feeds to light olefins and other hydrocarbons. In some embodiments, the methods and apparatus include feeding a hydrocarbon, a first catalyst, and a second catalyst into a reactor, where the first catalyst has a smaller average particle size and is less dense than the second catalyst. The first portion of the second catalyst may be recovered as bottoms from the reactor, and the cracked hydrocarbon effluent, the second portion of the second catalyst, and the first catalyst may be recovered as overhead products from the reactor. A second portion of the second catalyst may be separated from the overhead product, providing a first stream comprising the first catalyst and the hydrocarbon effluent and a second stream comprising the separated second catalyst, allowing the separated second catalyst in the second stream to be returned to the reactor.

Description

technical field [0001] Embodiments disclosed herein relate generally to systems and methods for increasing the productivity and / or flexibility of mixed catalyst systems. Certain embodiments of the present disclosure relate to methods for converting heavy hydrocarbon feedstocks such as vacuum gas oil and / or heavy oil resid to very high yields of light olefins such as propylene, ethylene, aromatics, and gasoline with high octane numbers Apparatus and method for maximizing the conversion rate of the present invention. Background technique [0002] Recently, the production of light olefins by the fluid catalytic cracking (FCC) process has been considered as one of the most attractive proposals. In addition, there is an increasing demand for petrochemical building blocks such as propylene, ethylene, and aromatics (benzene, toluene, xylene, etc.). Moreover, the integration of petroleum refineries and petrochemical complexes has become the first choice for both economic and envir...

AI Technical Summary

Problems solved by technology

This reactive stripping concept of the second reactor somewhat compromises the stripping efficiency and thus can lead to an increased coke load of the regenerator

Since the first reactor operates at significantly lower reaction temperatures, the process is limited by catalyst selectivity and lacks the desired olefin levels in the naphtha

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