硫代磷酸酯的合成及抑焦性能研究

摘要

以 CH3 OH、PCl3、二甲基亚砜为原料，合成出含硫、磷的新型抑焦剂硫代磷酸酯，并在管式裂解炉上，以轻质油为原料，水蒸气为惰性稀释剂，在常压、裂解温度为800～840℃的条件下，分别考察二甲基二硫（DMDS）、磷酸二酯与自制新型抑焦剂硫代磷酸酯在不同温度下的抑焦性能。结果表明，硫代磷酸酯抑焦效果优于 DMDS 和磷酸二酯。同时，在轻质油中加入抑焦剂硫代磷酸酯还能提高乙烯的收率。%A kind of coking inhibitor,phosphorothioate,was synthesized using CH 3 OH,PCl3 ,and dimethyl sulfone as feed. The anti-coking performance of dimenthyl disulfide (DMDS),phosphodiester and the new self-made coking inhibitor phosphorothioate was investigated,respectively in a tube crack-ing furnace at the conditions of 800—840 ℃ and atmospheric pressure. The light oil was used as pyroly-sis material and steam as inert diluent. The results show that the phosphorothioate,as a new kind of coke inhibitor,has excellent anti-coking performance,better than DMDS and phosphodiester. It is found that the addition of phosphorothioate into light oil can increase the yield of ethylene.