Deactivating effect of nitrogen compounds on the conversion of model hydrocarbons and a real feed under catalytic cracking condition

Effect of content and nature of nitrogenous compounds on the distribution of desired products in model hydrocarbons transformation is studied in cracking conditions on equilibrium zeolite catalyst. Cracking of n-undecane showed a decreasing almost in 2 times of conversion, yield of propane-propylene (PPF) and butane-butylene fraction (BBF) with increasing content of pyrrole in the feed up to 3000 ppm of nitrogen. Increasing the nitrogen content in the feedstock results to a nonlinear reduction of the cracking rate constants for the n-undecane reaction. It is established, the dependence of the yield of PPF, BBF, isobutane in BBF in n-undecane cracking in the presence of various nitrogenous compounds from the conversion stay constant, probably the poisoning occurs only as a result of blocking the acidic sites of the catalyst. It is established, that pyrrole, indole in the cracking of hydrocarbons n-undecane and decalin have the greater toxic effect, whey are strong hydrogen donors, which is accompanied by the formation of ammonia. Quinoline shows great poisoning ability in the catalytic cracking of cumene with low [H]-donor activity. In the catalytic cracking of not hydrotreated vacuum gasoil with a high content of aromatic structures the quinolin poisons catalyst greater than indole. During the processing of the heavy residue hydrocracking hydrocarbon-rich of paraffin-naphthene range, indole manifests the most poisonous ability.

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