原油和凝析油轻烃的毛细管柱气相色谱分析法的改进

分析原油和凝析物的C4～C8轻烃，一般首先蒸馏切割原油或凝析油，然后用一根长的高效毛细管色谱柱进行GC分析。为了避免蒸馏带来的轻烃损失，我们改用了凝析油直接进样分析、原油或混油凝析油在丙烷脱沥青和A12O3脱胶质后再直接进样分析、He抽提法分析C4～C8轻烃等三种方法。与此相适应，我们设计并制成了耐高温的微型毛细管柱无死体积联结器和其它辅助设备。

MODIFIED METHODS FOR ANALYSIS OF LIGHT HYDROCARBONS IN OILS AND CONDENSATES BY CAPILLARY COLUMN GC

For analysis of light hydrocarbons in oils and condensates a very common method consists of: first, a oil or condensate is distilled and，second，it is analysed by GC using a long and highly effective capillary column .In order to avoid the loss of some light hydrocarbons because of distillation, We used three modified methods: 1. direct sampling of pure Condensates. 2 .direct sampling of oils and condensate mixed with oil after asphaltene removal by propane and resin removal by Al2O3. analysis of C4—C8 light hydrocarbons by He extraction . To support these methods, we have designed and made a micro-capillary column-connector with zero-dead volume and some other supplementary equipment.