B - Operations – Transporting – 65 – B
Patent
B - Operations, Transporting
65
B
226/6
B65B 1/00 (2006.01) B01D 15/20 (2006.01) G01N 30/56 (2006.01)
Patent
CA 1226249
-24- Abstract Narrow Bore Microparticle Column Packing Process And Product A process for packing narrow bore chromatographic columns and the resulting product are provided. A flexible column, preferably of fused silica, of inner diameter less than 500 µ m is selected. A slurry is formed in a reservoir from a mobile solvent and par- ticles of specified diameter. For liquid chromato- graphy the particle size ranges from 3 µ m to 10 µ m; for gas chromatography the particle size ranges from 3 µ m to 100 µ m. An end restriction is placed in the end of the column to permit the flow of mobile solvent and to restrict the passage of particles out the end of the column. The reservoir is attached to the column and the slurry is flowed under pressure into the column. A two-step pressure sequence is used to first set up the bed of particles and then to compress the bed. First, an initial pressure is maintained for an initial period, preferably less than 10 minutes. Next, the pressure is raised from the initial pressure to a maximum pressure and is maintained at the maximum pressure for a second period. The product in either case is a stable, loose packed column having a high plate number per unit length.
435335
R. William Wray & Associates
Varian Inc.
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