| abstract |
(57) [Problem] To purify an easily polymerizable compound such as (meth) acrylic acid by using a purification tower that draws out a liquid from the middle of the tower, effectively preventing the polymerization and extending the long term. Provided are a novel tray for extracting liquid, a purification tower using the tray, and a purification method using the purification tower, which enable stable purification. SOLUTION: A liquid extracting tray of a refining tower, comprising a liquid receiving tray and a liquid extracting pipe for extracting liquid from the liquid receiving tray, is used. |