Catalytic reaction

It is possible to try adding propylene-producing additives, and the effect is quite noticeable.

The core of this process technology is to optimize the operation of the heavy oil lift pipe reactor, by reducing the temperature in the section where the oil mixture comes into contact with the gas, thereby decreasing the dry gas yield； At the same time, by using a higher reaction temperature and a lower catalyst mixing temperature, optimized operating conditions with a high oil-to-catalyst ratio and a short reaction time are achieved, thereby further increasing the propylene yield, reducing the sulfur content in gasoline, and improving the product distribution. The method by which this technology achieves the aforementioned objectives is to take advantage of the relatively low temperature of the catalyst bed in the gasoline riser settler and its high residual activity; this catalyst bed is then returned to the bottom of the heavy oil riser to mix with the regenerant. By reducing the temperature of the catalyst mixture in the reaction section of the heavy oil riser, it is possible to increase the catalyst-to-oil ratio there, lower the temperature at which oil and catalyst come into contact and vaporize, thereby reducing the production of dry gas and coke and increasing the overall liquid yield while improving the product distribution. The dual lift pipe technology makes full use of the technical advantages of the dual lift pipe process, enabling maximum increase in propylene production while simultaneously ensuring that the olefin content in gasoline products remains below 18 v%. Propylene in liquefied petroleum gas can reach 37 w%

This seafood enthusiast has yet to explain why this process can produce more propylene

To increase the yield of propylene by changing the reaction direction, the common approach is to add propylene additives

The original poster didn’t read carefully the explanation regarding this process.