A vacuum in which a rotating screen-attached rotor 30 is placed in a vessel having a vacuum inside, and a liquid treated material is introduced into the rotor 30 from the inside, passed through the screen 3, and the treated material is refined and degassed. With respect to the deaerator, the screen 3 has a cylindrical shape with a circular cross section, and has a perforated plate shape in which a plurality of through holes are formed in the radial direction of the cylindrical screen 3, and a plurality of screens 3 are formed on the inner wall surface. An opening of the penetrating portion is an inlet opening, and an opening of a plurality of the penetrating portions formed on an outer wall surface of the screen is an outlet opening, and an opening area of the inlet opening is formed to be larger than an opening area of the outlet opening. , the processing capacity of the vacuum deaerator was increased without increasing the size of the device.
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