C4 hydrogenation
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Help: My process involves the hydrogenation of olefins to remove sulfur, nitrogen, and oxygen-containing compounds. Why isn’t the hydrogenation of olefins complete? The olefin content in the raw material is 0.4–0.7%, and it drops to 0.2% after hydrogenation. The reactor temperature is 300–310 degrees, the reactor pressure is 3.0 Mpa, and the purity of hydrogen is 99.9%. There was not much olefin in the raw material to begin with; what caused that? The device has only processed half of the amount, with a space velocity of 1; it is capable of removing sulfur, nitrogen, and oxygen-containing compounds. It’s that the olefins aren’t stable; theoretically, the olefins should be removed first.
Try reducing the air velocity and then increasing the hydrogen content~
First of all, thank you for the suggestions you gave me. However, my current air velocity is 1, while it should be 2.68 according to the design requirements; the processing load is only half of what it should be, and the circulation rate is also at its maximum limit.
Contact the catalyst manufacturer to see the performance specifications they provide for the catalyst； Are the reaction temperature and pressure you’re using too high? ； Instead, a thermal pyrolysis reaction occurs again; it’s just a suspicion, please don’t laugh ；
If it remains this way, the catalyst should be suspected
It should be thermal pyrolysis; a low space velocity is not necessarily advantageous. At low velocities, saturated hydrocarbons remain in the reactor for too long, leading to increased cracking. The operating temperature can be appropriately reduced.