Issues regarding the reprocessing of DME-containing liquefied gas in catalytic cracking risers
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The gas coming out of the alkylation light-end removal tower contains about 2% dimethyl ether; it currently enters the catalytic absorption stabilization unit for the recovery of liquefied gas, which results in an excess level of dimethyl ether in the catalytically liquefied gas. This in turn leads to an excess level of propyl dimethyl ether, preventing the domestically produced propane from being used in propane dehydrogenation. I am now wondering whether catalyzing the recycle of this gas in the lift pipe can cause the dimethyl ether to react and decompose. Please ask a professional for clarification. Tests have shown that it is effective; the propane level in the product is kept below 500 ppm, whereas it used to be around 1500 ppm. If the reaction time is longer, the effect is estimated to be better.
I haven’t paid attention to similar issues; liquefied gas here is not tested for this parameter