Isobutene recovery tower base solution separating and recycling method

The invention provides an isobutene recovery tower base solution separating and recycling method which comprises the following steps: a) conveying an isobutene recovery tower base solution to an isobutene refining tower to be primarily separated and purified to respectively obtain an isobutene product and a tower bottom material; b) conveying the tower bottom material obtained in step a) to an isoprene refining tower to be secondarily separated and purified to respectively obtain an isoprene product, a normal hexane product and a tower bottom heavy component. Compared with the prior art, the isobutene recovery tower base solution separating and recycling method disclosed by the invention can achieve separation and recycling on high added value raw materials of isobutene, isoprene and normal hexane under specific technological steps through matched use of the isobutene refining tower and the isoprene refining tower; thus, drainage of waste liquid is reduced; furthermore, the purity of the recycled isobutene, i