Converting oxygenates to olefins over a catalyst comprising acidic molecular sieve of controlled carbon atom to acid site ratio

A process for making an olefin product from an oxygenate-containing feedstock comprising:

• i) providing an inventory of catalyst particles comprising a molecular sieve containing acid sites, said catalyst particles having an average coke loading of 1 to 10 carbon atoms per acid site of said molecular sieve as measured using acid site density as determined by NMR,
• ii) contacting the feedstock in a reaction zone with said catalyst particles under conditions effective to convert the feedstock into an olefin product stream to provide unregenerated catalyst particles,
• iii) removing a portion of said catalyst particles from said reaction zone and contacting said portion with a regeneration medium in a regeneration zone under conditions effective to obtain regenerated catalyst particles having an average coke loading of no greater than 10 carbon atoms per acid site of said molecular sieve, and
• iv) introducing said regenerated catalyst particles into said reaction zone in an amount sufficient to provide a catalyst mixture of unregenerated catalyst particles and regenerated catalyst particles, said catalyst mixture having an average coke loading of 1 to 10 carbon atoms per acid site on the molecular sieve in said reaction zone.

A process for making an olefin product from an oxygenate-containing feedstock comprising:

• A) contacting the feedstock in a reaction zone with catalyst particles comprising a molecular sieve containing acid sites and having no greater than 10 carbon atoms per acid site, under conditions effective to convert the feedstock into an olefin product stream and to provide unregenerated catalyst particles,
• B) analyzing a portion of said catalyst particles from said reaction zone by measuring the number of carbon atoms per acid site of said molecular sieve using acid site density as determined by NMR, to provide a sample measurement value for said portion,
• C) contacting a portion of said unregenerated catalyst particles with a regeneration medium in a regeneration zone under conditions which are a function of said sample measurement value, effective to obtain regenerated catalyst particles which have an average coke loading of no greater than 10 carbon atoms per acid site of said molecular sieve, and
• D) introducing said regenerated catalyst particles into said reaction zone to provide a catalyst mixture of unregenerated catalyst particles and regenerated catalyst particles, in an amount sufficient to provide an average coke loading on said catalyst mixture ranging from 1 to 10 carbon atoms per acid site of said molecular sieve.