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AssigneeSaudi Basic Industries Corporation
InventorsAshim Kumar Ghosh, Mohammad Shafiei, Manuel Castelan, Pamela Harvey, Neeta Kulkarni
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This invention relates to a process for pretreating a zeolite catalyst, specifically a zeolite which has been modified with phosphorus. The catalyst may be used in a process for alkylation of aromatics, specifically toluene methylation. The pretreatment is first to contact the catalyst with the process reactants used in a process for alkylation of aromatics for at least two hours at conditions to produce an alkylated aromatic product and then with a gaseous stream containing oxygen at a temperature and for a time until there is no oxygen consumption. The zeolite may be a MFI zeolite. This pretreatment procedure for a phosphorus-modified zeolite catalyst produces a catalyst which has increased run time, i.e., decreased deactivation rate, compared to a fresh catalyst, even after successive regenerations.
A process for the alkylation of aromatics comprising:
A process for pretreating a phosphorus-modified zeolite catalyst comprising contacting the catalyst with alkylation process reactants for at least two hours at process conditions to produce an alkylated aromatic product and then contacting the catalyst with a gaseous stream containing oxygen at a temperature and for a time until there is no oxygen consumption.
A pretreated catalyst comprising a phosphorus-modified zeolite which has been contacted first with alkylation process reactants for at least two hours at process conditions to produce an alkylated aromatic product and second by a gaseous stream containing oxygen at a temperature and for a time until there is no oxygen consumption.
Dependencies are inferred from the claim text.