The reason for discoloration of pellet which was produced by gas phase technique in LLDPE unit was analyzed in this paper.From the aspects of technical condition,granulating fixture and additives,some suggestions on improvement were put forward.

• 分析了气相法生产线性低密度聚乙烯(LLDPE)装置粒料颜色变黄的原因,从工艺条件、造粒设备、添加剂等几方面提出了改进措施。