By preliminary analysis of the low-boilling-point compound content supernormal phenomenon in HTM T-66 used in PET plant,found out that it was the over-heat in parts of the system that lead to the T-66 quality change.

• 对聚酯装置使用的热媒T-66中低沸物含量超标现象进行了分析,认为系统存在的局部过热会导致T-66品质变化。