Patent ID: 8304582

Claim:
A fluidized catalytic process for production of dimethyl ether from methanol, wherein said process is carried out in a reactor in which the catalyst is in a fluidized state, characterized in that said process comprises the following steps of (1) feeding the methanol feedstock via two or more locations selected from the bottom, lower part, middle part and upper part of the reactor, contacting with the catalyst for preparation of dimethyl ether via methanol dehydration, carrying out the reaction of preparing dimethyl ether by methanol dehydration to obtain the reaction stream, separating said reaction stream to obtain a coked catalyst and a crude product primarily containing the target product, i.e., dimethyl ether; and (2) totally or partially feeding the coked catalyst obtained in step (1) into a regenerator in a continuous or batch manner for regeneration via coke-burning, the regenerated catalyst being directly recycled to step (1) after being totally or partially cooled; characterized in that said reactor is a composite riser+fluidized bed reactor, wherein said fluidized bed reactor is located at the top of the riser, and a first catalyst mixing device is set up at the bottom of said riser, and characterized in that said methanol feedstock is fed via two or more locations selected from the bottom of the first catalyst mixing device, the lower part of the riser, the middle part of the riser, the upper part of the riser, and the fluidized bed reactor, wherein at least one of said methanol feedstock feed locations is to the fluidized bed reactor.