Reasons for catalyst feed atomization
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I’m just starting to learn about *catalytic cracking units now, and I have a silly question: why does the catalytic feed need to be atomized? I used to study the oxidation dehydrogenation of butylene to produce butadiene; from what I understand, the reactions are more or less similar – there’s a heating furnace at the beginning, and then the material goes directly into the reactor, without any atomization of the feed. Because it has already become a gas phase!
It mixes more evenly with the catalyst in the lift pipe! The reason why catalysts are sensitive to moisture and need to be atomized lies right here!
I used to study catalysis; later I came into contact with butadiene, but no actual work was carried out on it. The butadiene process is old-fashioned
Learn it!* ! ! ! ! ! ! ! ! ! ! !
Catalytic cracking is a gas-phase reaction; it is important to rapidly vaporize the feedstock that enters the lift pipe. By injecting atomized steam, the oil and gas can be mixed evenly with the catalyst, allowing for thorough contact. Additionally, the atomized steam helps to reduce the partial pressure of the oil and gas, thereby preventing rapid coking of the catalyst. In the event of a disruption in the feedstock supply, the atomized steam also helps to prevent blockage of the nozzles.
The catalytic unit is used to process heavy distillate oil; if it enters the lift pipe without being atomized, how can it come into full contact with the catalyst to undergo a chemical reaction? Take a close look at the FAQs on catalytic cracking – they contain comprehensive information, including seven steps such as adsorption and desorption.
The catalyst is thoroughly atomized along with the steam, coming into contact with the catalyst to fully carry out the seven steps of the catalytic reaction； Complete the contact and reaction of the catalyst ； Ensure effective contact ；
Ah, our factory isn’t producing butadiene anymore – first, there’s no money, and second, there’s no market
Isn’t there a heating furnace before entering the riser reactor? Then it can come into contact with the catalyst, right?
Because the catalytic cracking feedstock is a heavy oil fraction with a boiling range of 350–500°C, at a feed preheating temperature of over 200°C. There is no vaporization; it exists entirely in the liquid phase. Upon entering the riser reactor, since the catalytic cracking reaction is a gas-phase reaction, the reaction time is only a few seconds. The crude oil must vaporize rapidly. Without atomization, it is difficult for large amounts of liquid reformed feed oil to vaporize quickly enough to complete the reaction. Moreover, the feed oil must be evenly mixed with the catalyst particles transported in a gas-solid form within the reactor to carry out the catalytic cracking reaction. Therefore, the catalytic cracking feed oil must first be atomized into small droplets using a feed oil nozzle before it can enter the reactor for reaction. Agree with this view!
Do you know about catalytic cracking? ? ? ? ? ? ? ? ? ? ? ?