Patent ID: 9233885
Filing Date: 2016-01-12
CPC Classification: B01J,C07C

Claim Text:
1. A process for the conversion of oxygenates to olefins comprising: passing an oxygenate feedstream to a first stage reactor; contacting the oxygenate feedstream with a catalyst in a fluidized bed in the first stage reactor, thereby creating an intermediate stream; separating catalyst from the intermediate stream comprising olefins, wherein at least 96% of the catalyst is removed from the intermediate stream, thereby creating an intermediate product stream and a first returned catalyst stream, comprising a first portion and a second portion; returning the first portion of the first returned catalyst stream to the first stage reactor, wherein the first portion of the first returned catalyst stream comprises catalyst in the same form as recovered from the intermediate stream; passing the intermediate product stream to a second stage reactor; contacting the intermediate product stream with a catalyst in a fluidized bed in the second stage reactor, thereby creating an effluent stream; separating catalyst from the effluent stream thereby creating a product stream and a second returned catalyst stream; returning the second returned catalyst stream to the second stage reactor, wherein the second returned catalyst stream comprises catalyst in the same form as recovered from the effluent stream;