Abstract
This paper described the discovering process of some shortcomings of the conventional fluid catalytic cracking (FCC) process and the proposed two-stage riser (TSR) FCC process for decreasing dry gas and coke yields and increasing light oil yield, which has been successfully applied in 12 industrial units. Furthermore, the multifunctional two-stage riser (MFT) FCC process proposed on the basis of the TSR FCC process was described, which were carried out by the optimization of reaction conditions for fresh feedstock and cycle oil catalytic cracking, respectively, by the coupling of cycle oil cracking and light FCC naphtha upgrading processes in the second-stage riser, and the specially designed reactor for further reducing the olefin content of gasoline. The pilot test showed that it can further improve the product quality, increase the diesel yield, and enhance the conversion of heavy oil.
Highlights
Fluid catalytic cracking (FCC) was an important process for converting heavy oil into high octane gasoline, diesel and liquified petroleum gas (LPG)
This paper described the discovering process of some shortcomings of the conventional fluid catalytic cracking (FCC) process and the proposed two-stage riser (TSR) FCC process for decreasing dry gas and coke yields and increasing light oil yield, which has been successfully applied in 12 industrial units
In the conventional RFCC reactor, the overlong reaction time, the fast deactivation of catalyst, and the competitive adsorption and reaction between fresh feedstock and cycle oil would lead to the overcracking of light oil and the deterioration of the product distribution
Summary
Fluid catalytic cracking (FCC) was an important process for converting heavy oil into high octane gasoline, diesel and liquified petroleum gas (LPG). Abstract This paper described the discovering process of some shortcomings of the conventional fluid catalytic cracking (FCC) process and the proposed two-stage riser (TSR) FCC process for decreasing dry gas and coke yields and increasing light oil yield, which has been successfully applied in 12 industrial units.
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