Regeneration of ZSM-5 type catalyst with a source of alkali or alkaline earth metal cations or ammonia
AssigneeMobil Oil Corporation
InventorsThomas F. Degnan, Malvina Farcasiu
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Abstract
A novel method is provided for regenerating deactivated crystalline zeolite catalysts at low temperature. The organic residue is contacted with a source of alkali or alkaline earth metal cations, or a source of ammonia, and the organic residue, including nitrogenous compounds, is extracted with an organic solvent. The method is particularly useful with deactivated ZSM-5 type dewaxing catalyst.
Claims17
A method for regenerating a regenerable deactivated catalyst comprising a crystalline acidic zeolite, a carbonaceous residue, and tenaciously sorbed nitrogen compounds, said nitrogen compounds having been acquired from a petroleum or petrochemical hydrocarbon feed concomitant with catalytic conversion of said feed, which method comprises:
- contacting said deactivated catalyst with a source of alkali metal or alkaline earth metal cations, ammonia, or mixtures thereof, whereby rendering said nitrogen compounds extractable;
- extracting said extractable nitrogen compounds with a liquid organic solvent selected from the group consisting of alcohols, ethers, esters, nitrites, furans, tetrahydrofurans and paraffinic and aromatic hydrocarbons having up to eight carbon atoms, said contacting and extraction being conducted in the absence of said feed at about 20.degree. C. to about 300.degree. C. for about 1 hour to 100 hours;
- and converting said extracted catalyst to the hydrogen form.
Dependencies are inferred from the claim text.