Patent ID: 8796499

Claim:
A process for producing light olefins from methanol and/or dimethyl ether comprising the steps of: (a) introducing a feed comprising methanol and/or dimethyl ether into a fluidized-bed reactor from its bottom, and reacting the feed in a dense phase zone and a transition zone of the fluidized-bed reactor by contacting it with a catalyst, to form an effluent I comprising unreacted feed, reaction products and entrained solid particulate catalyst; (b) introducing a terminating agent at a lower portion of a gas-solid separating zone of the fluidized-bed reactor into the effluent I, to give an effluent II, wherein the terminating agent is at least one selected from the group consisting of water, C 2 to C 5 alcohols, C 2 to C 10 ethers, hydrocarbons having 4 or more carbon atoms, and C 6 to C 12 aromatic hydrocarbons; and (c) passing the effluent II into the gas-solid separating zone in upper portion of the fluidized-bed reactor, where gas-solid separation is accomplished to give a gaseous product stream and solid catalyst, said gaseous product stream being led to an after-treatment stage, and said solid catalyst being circulated to the dense phase zone in lower portion of the fluidized-bed reactor or, alternatively, being led to a regenerator after having been stripped in a stripper wherein the effluent II passed into the gas-solid separating zone is first passed through a whirl-flow quickly-separating unit to separate out most of the entrained solid particulate catalyst, and a resultant gaseous stream III containing the remaining entrained particulate catalyst is led into a outside-type cyclone and is separated there into a particulate catalyst stream and the gaseous product stream.