Removal of carbon monoxide and oxygen from olefins – Seeking expert advice
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This post was last edited by jordan569 on 2013-1-6 21:06. The client is looking for a catalyst for LLDPE plants. This catalyst is likely a copper-zinc oxide catalyst, whose function is to remove carbon monoxide and oxygen from gas streams rich in olefins. I’d like to ask everyone, what is this catalyst? This is my first time posting here for help, so thank you all in advance! . Note # ) # # , .
Aren’t CO and oxygen present in very trace amounts in low-density polyethylene?
CO removal uses a copper oxide catalyst, while O2 removal uses a pure copper catalyst
Ethylene decarboxylation is the process of converting CO into CO2 in the presence of a CuO catalyst, Polymax 300; the reaction equations are as follows: CO + CuO → CO2 + Cu, and Cu2O + CO → 2Cu + CO2. When the copper oxide in the catalyst is reduced to elemental copper, it needs to be regenerated. Regeneration involves re-oxidizing the reduced elemental copper, thereby restoring the activity of the catalyst bed. The reaction equations are as follows: 4Cu + O2 → 2Cu2O; 2Cu2O + O2 → 4CuO. The catalyst for ethylene deoxygenation is UT-2000, which contains copper; UT-2000 is made by attaching copper chromite to silica, with copper accounting for about 13% of its composition. Oxygen removal is achieved through the oxidation of the catalyst to form copper oxide. The reaction equations are as follows: 4Cu + O2 → 2Cu2O; 2Cu2O + O2 → 4Cu. As we have just learned, the amounts of oxygen and carbon monoxide in the raw materials are very low, yet this is still not sufficient to meet the requirements of the reaction. Both the CO and oxygen levels are very low
Chalcogen-based catalysts, used for oxygen hydrogenation. Suitable for processes such as the catalytic production of olefins.
I’m just asking gently. Should CO be removed first or O2? Shall we take them off together? If it’s not done together, can the catalyst be regenerated by removing another substance? For example, Cu reacts with O2 to form CuO, which then reacts with CO to produce Cu.
The use of CuO to remove olefins such as propylene and ethylene should be limited; large amounts of CO and O2 cannot be removed in this way. It seems that a recommended value is less than 50PPM of CO in the olefins, and using a CuO catalyst might be better in such cases. As for where exactly 50PPM comes from, one should consult experts for an answer.