The utility model relates to the technical field of alkali adding devices, in particular to an alkali adding device for rectification, which comprises a mixing
barrel, an alkali liquor box, a
metering pump, a filter box and a motor, a feeding
pipe is communicated with the rear side of the upper surface of the mixing
barrel, a flow meter is mounted on the outer side wall of the feeding
pipe, the feeding
pipe is connected with a crude
methanol conveying pipeline, and the filter box is connected with the feeding pipe. And the upper surface of the alkali liquor box is fixedly connected with a liquid pumping pipe. When the device works, crude
methanol feed liquid enters the mixing
barrel along the feeding pipe, alkali liquor enters the mixing barrel along the liquid pumping pipe, the filter box and the alkali adding pipe under the pumping action of the
metering pump, impurities in the alkali liquor can be filtered by the filter plate, and the impurities are prevented from entering subsequent pipelines and equipment to
cause blockage or damage; the mixing of the crude
methanol feed liquid and the alkali liquor is accelerated, the uniform
mixing effect is improved, the acid regulation is realized, the stability of the pH value of the crude methanol feed liquid is ensured, the crude methanol feed liquid is prevented from entering a rectifying
tower to corrode equipment during subsequent rectification, and convenience is brought to the rectification work of the feed liquid.