For catalytic cracking dry gas, the content of compounds above C3 should not exceed 3%; does this 3% include C3 as well?
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Today, I had a disagreement with our manager regarding the control of dry gas components. I believe that the target set by the company, which states that the content of compounds above C3 in the dry gas should not exceed 3%, includes the amounts of propylene and propane as well. However, our manager said that it only refers to compounds above C3, excluding C3 itself. Can anyone explain this?
Propane and propylene are both high-value materials compared to C-2 compounds. In refineries, dry gas is mostly used as fuel; a high content of propane and propylene in this dry gas not only results in poor economic benefits but also leads to inferior combustion efficiency in the heaters； To keep the dry gas at the top of the reabsorption tower stable and ensure that the C3+ content remains at or below 3%, propane and propylene must be included; a high C3 content in the dry gas may indicate excessive stripping or poor performance of the reabsorption tower.
Components above C3 refer to C1C2; components including C3 and above refer to C1C2C3
The main components of dry gas are C1 and C2; C3 is part of the liquefied gas components. Components above C3 certainly include C3. If the liquefied gas components are burned as fuel gas, then the leader is really impressive.
C3 must be included; propylene currently has the highest added value among catalytic cracking products. Should it be burned in the dry gas? This is a rhythm that hasn’t been thought through properly. :(
The dry gas index ensures that the content of C3 and higher components is no more than 3%. It definitely includes C3.
C3 is definitely included; optimizing the operation of catalytic dry gas allows for lower control levels