A low-silicon defoaming agent for delayed coking was developed, which is a complex additive package containing polyether modified polysiloxane mainly. The polyether modified polysiloxane was prepared from hydrogenous silicone oil and polyether, with FA-2 as catalyst. The influences of reaction conditions, such as reaction time, reaction temperature, the ratio of reagents and catalyst dosage were studied, and the optimum conditions were obtained as follows: the mole ratio of Si-H in hydrogenous silicone oil and -OH in polyether was in the range of (1 : 1.4) - (1 : 1. 6), the mass fraction of catalyst was 0.4%, reaction was proceeded at 110 °C for 8 h. Performance evaluation results showed that the prepared polyether modified polysiloxane and its complex exhibited good antifoaming and suppressing foam performance.%研制了一种用于延迟焦化过程的低硅消泡剂,该消泡剂是以聚醚改性聚硅氧烷为主体复配而成.以含氢硅油与聚醚为原料,催化合成了聚醚改性聚硅氧烷;考察了反应时间、反应温度、物料配比、催化剂用量对反应的影响,确定了最佳合成条件,即含氢硅油中的Si-H与聚醚中的-OH的摩尔比为1∶(1.4～1.6)、催化剂FA-2的质量分数为0.4％、反应温度为110℃、反应时间为8h.评价结果表明,所制备的聚醚改性聚硅氧烷及其复配物的消泡及抑泡性能良好.
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