GPC-ELSD测定VGO馏分油的相对分子质量及其分布

Application of GPC-ELSD in the Deterimination of Relative Molecular Weight and Its Distribution of VGO

应用高效凝胶色谱仪(GPC)、蒸发光散射检测器(ELSD)及已知相对分子质量的标样,采用线性校正法进行校正,经过复杂的数学运算得到VGO馏分油的相对分子质量及其分布。考察了该方法测定的精密度,并与传统蒸汽压渗透计法(VPO)进行了对比实验。结果表明,该实验相对偏差小于1%,与传统VPO方法相比分析速度提高5倍,进样量减少到1/10。该方法具有准确快速、自动化高的特点。

A High performance gel permeation chromatography（GPC）.evaporative light-scattering detector（ELSD） method were applied to determine the relative molecular weight and its distribution of vacuum gas oil（VGO）, adopting linear calibration with kown relative molecular weight calibration standard and complicated mathematics operation. Also the precision of the technique was evaluated and the relative molecular weight between GPC and VPO was compared. The results show that the relative error is less than 1 %, comparison with traditional method of VPO the analysical rate is promoted five times, the sample oils less to 1/10. The technique is accurate, fast and high level of automatic operation.