摘要：

The invention discloses a method and a device for preparing isobutene by tertiary butyl alcohol. The device comprises a reaction kettle and a separation tower, wherein an overhead condenser is arranged on the separation tower while a heater is arranged at the bottom of the separation tower; the reaction kettle is communicated with the separation tower by a pipeline; one end of a dehydrating tower is communicated with the heater positioned at the bottom of the separation tower, and the other end of the dehydrating tower passes through a cooler to be communicated with a distributor positioned on the upper part of the separation tower; the overhead condenser is externally connected with a condenser with an opening; the isobutene gas which is generated by continuous lytic reaction between an ultra-intense solid acid catalyst inside the reaction kettle and the introduced tertiary butyl alcohol and boiling tertiary butyl alcohol vapor flow together into the separation tower, and a dehydrating extractant is introduced into the separation tower from the distributor. The isobutene gas flows out from the tower top, and is frozen into a liquid, namely the finished product of the isobutene, by the condenser. The unreacted tertiary butyl alcohol is condensed into a condensing liquid by the overhead condenser, and a part of the condensing liquid reflows in the tower and a part of the condensing liquid flows out and returns to the reaction kettle. The dehydrating extractant passes through the distributor, enters the separation tower from the upper part of the tower, extracts and separates water content in a rising vapor and flows to the bottom of the tower. The dehydrating extractant which absorbs the water is fed to the dehydrating tower, and is heated to remove the dehydrated vapor to obtain the product.

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