公开(公告)号：US12083499B2

公开(公告)日：2024-09-10

申请号：US17311437

申请日：2019-11-11

Applicant: SHOWA DENKO K.K.

Inventor： Hirotsugu Nakanishi ,  Ritsuko Wakayama

IPC: B01J20/283 ,  B01J20/10 ,  B01J20/28 ,  B01J20/30 ,  B01J20/32 ,  G01N30/08 ,  G01N30/56 ,  G01N30/74

CPC classification number: B01J20/283 ,  B01J20/103 ,  B01J20/28004 ,  B01J20/28061 ,  B01J20/3092 ,  B01J20/3204 ,  B01J20/3219 ,  B01J20/3248 ,  G01N30/08 ,  G01N30/56 ,  G01N30/74 ,  G01N2030/565

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.