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公开(公告)号：US20220023832A1
公开(公告)日：2022-01-27
申请号：US17311437
申请日：2019-11-11
Applicant: SHOWA DENKO K.K.
Inventor： Hirotsugu NAKANISHI , Ritsuko WAKAYAMA
IPC: B01J20/283 , B01J20/30 , G01N30/56 , G01N30/74
Abstract: Provided is a guard column including a filling part having a length of 2.0 cm to 3.5 cm formed of a filler, in which the filler is made of porous silica gel having a hydrophilized surface and an average particle size of 1.5 μm to 2.5 μm, and a pressure difference when an aqueous solution is fed at a linear flow rate of 2.1 cm/min is 4.0 MPa or more.
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