气相色谱运动过程仿真

通过对组分在色谱柱内运动过程的仿真，指出平均归一化线速与实际过程的当地线速的区别及其对保留时间模拟准确度的影响。

Simulation of Gas Chromatographic Peak Motion Process

Solute motion process under different temperature, pressure and/or flow program conditions is simulated with the aid of numerical calculation of the differential equation. It is demonstrated that there exist some differences between the normalized average linear velocity and the normalized local linear velocity. As time develops, they intercept, and may not reach the column end at the same time, thus may result in errors in retention time simulation. In constant pressure process, where the compressibility factor(j) does not change, simulation results in a model index of 1, and no model difference can be found when the integrate equation is used. In pressure varying process, where j changes by time, simulation results in an model index which deviates to 1, and positive (for a j decrease process) or negative (for a j increase process) error can be found when the integrate equation is used. The numerical solution of the differential equation is singular under given programs, which corresponds to a specific space line in z, t, u coordinates.