Packed glass capillary column with multi-cores]
加芯毛细管填充柱的理论研究

The paper describes the preparation of the columns with multi-cores and their plate heights, optimum gas velocity, minimum plate heights (HETP) and corresponding pressure drop (deltaP=Pi-Po) were measured. It is found that HETP increases as core number increase, but column pressure drop (deltaP) decrease with increase of core number. The conclusion is: 1. The column with multi-cores have a better permeability than the conventional packed capillary column. Although its column efficiency is lower than that of the conventional one when packed particles is in the same column size, the comprehensive properties (N/deltaP) are evidently superior than the conventional capillary column. 2. The pressure drop decreasesas the number and diameter of the core in packed capillary column increase. 3. When packed column particle size gets smaller, column efficiency gets higher, but the particle inlay bacomes difficult. The existence of the cores will make the column efficiency get some loss, but it can improve the column permeability and the inlaid geomery. 4. In considering pressure drop, HETP and the particle inlaid condition in column fabrication as a whole, the optimum column type is the packed capillary column with three cores. 5. Ideal column size is: deltad=1-1. 5dp,d=1-2dp,n> or =3, dp=140-250 mesh.