[Q&A Question 164] 2016.10.01
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【Q&A Question 164】October 01, 2016: What are the sources of CO and CO2 in the system? What are the main hazards to hydrocracking catalysts? The answer key will be available after responding; scoring is based on answering the key points. Answer: It mainly comes from external addition, that is, new hydrogen. Under the action of high-temperature and high-pressure catalysts, CO and CO2 react to form methane while releasing heat; excessive heat can accelerate the deactivation of the catalyst.
New hydrogen is added. Mainly, a methanation reaction occurs that releases heat, causing the catalyst to coking
Hydrogen is the main source! It is mainly inert gases; a high concentration of these gases reduces the hydrogen partial pressure. Carbon monoxide reacts with hydrogen to form methane, and this is an exothermic reaction that can easily cause the reactor to overheat!
It causes catalyst poisoning and generates highly toxic substances
The recycled hydrogen contains impurities; these impurities react with the carbon produced by catalyst coking and with water, as well as with materials resulting from feedstock cracking. This leads to methanation reactions that release large amounts of heat, causing the catalyst bed to overheat.
Combustion, reaction； The hazard is the risk of fire and explosion
It comes from external addition, that is, new hydrogen. Under the action of high-temperature and high-pressure catalysts, CO and CO2 react to form methane while releasing heat; excessive heat can accelerate the deactivation of the catalyst.
It seizes the catalyst’s active centers, reducing reaction activity. The carbonylation reaction is highly exothermic, prone to causing overheating.