多种类型延迟焦化消泡剂消泡性能的研究

介绍了一种在高温下评价消泡剂消泡性能的方法，通过该方法评价了不同类型延迟焦化消泡剂的消泡性能，并通过热重分析的方法考察了消泡剂的高温稳定性。实验结果表明，无硅消泡剂耐热性很差，在150 ℃以后就发生分解，起不到消泡作用，不适合延迟焦化过程使用；而有机硅消泡剂在400 ℃时，仍然能保持很好的消泡效果，适宜的有机硅消泡剂加入量为20～50 ?g/g，含有交联结构聚硅氧烷的消泡剂在加入量很少的情况下就能达到很好的消泡效果。

RESEARCH ON DEFOAMING PERFORMANCE OF DIFFERENT DEFOAMERS APPLIED IN DELAYED COKING PROCESS

An evaluation method for testing the defoaming performance of defoamers at high temperature was introduced, and it was used to compare defoamers for delayed coking process. The thermal stability of defoamers was investigated by TGA. Test results showed that the silicon-free defoamers were very unstable at high temperature, they decomposed at about 150℃ and lost defoaming function, thus they were not suitable for delayed coking process. Defoamers having organic silicon maintained good defoaming performance at temperature as high as 400℃, it was suggested that the proper dosage of these defoamers for delayed coking should be in the range of 20-50 ?g/g. Moreover, defoamer with crosslinking structure of polysiloxane exhibited good defoaming effect even at low dosage.