Deisobutanizer for C4 reducing device

The utility model relates to the technical field of C4 devices, in particular to a C4 device deisobutanizer which comprises a supporting frame, the left side and the right side of the bottom end of the supporting frame are fixedly connected with bases through nuts, and the left side of the top end of the supporting frame is fixedly connected with a C4 device deisobutanizer through a nut. A pipe gallery is installed, holes are formed in a washing water inlet and return pipeline of the pipe gallery of an olefin separation device, and washing water is guided to extend through an acetylene hydrogenation pipe gallery to a deisobutanizer and a 1-butene rectifying tower of a C4 production device and enter newly-added washing water reboilers of the deisobutanizer and the 1-butene rectifying tower to replace currently-used low-pressure steam reboilers. The deisobutanizer of the C4 device is reduced, the problem that the low-pressure steam consumption of the C4 device is large is solved, the problem that the temperatur