Does a small amount of dimethyl ether in the C4 feedstock have an impact on palladium-based catalysts?
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The hydrogenation process involves hydrogenating tetraalkynes to recover monoolefins; specifically, it deals with the alkynyl-containing off-gases emitted from the butadiene extraction columns, which contain vinyl acetylene and 1,3-butadiene. These gases are then diluted to keep the concentrations of alkynes and butadiene at around 2%, after which hydrogenation takes place. However, industrial feedstocks contain approximately 300 ppm of dimethyl ether. The hydrogenation catalyst used is a palladium-based catalyst. I would like to ask experts whether dimethyl ether has any effect on palladium-based catalysts? Does the presence of dimethyl ether produce carbon dioxide and carbon monoxide? Thank you!
Dimethyl ether should have no effect on palladium catalysts. What is the content of VA? In fact, if there is a BD extraction tower, a very small unit can be used to selectively hydrogenate VA into BD. Feel free to communicate!
Under hydrogen-rich conditions, hydrocarbons do not produce carbon monoxide or carbon dioxide; however, it may be necessary to investigate whether dimethyl ether undergoes excessive hydrogenation to form water under hydrogenation conditions. Furthermore, dimethyl ether is prone to hydrolysis into methane and methanol under hydrogenation conditions, and methane reduces the hydrogen purity of the recycled hydrogen.
This process probably doesn’t involve recycled hydrogen. Dimethyl ether does have a certain effect on the activity of palladium, but no other products should be formed. Additionally, with such high concentrations and significant temperature increases, is external circulation used for heat removal?
Based on the current operation of industrial plants, it seems that dimethyl ether has no effect on Pd catalysts. We are also working on a technology involving the addition of tetraalkynes to butadiene; we welcome discussions on this topic!