降凝剂对模拟油中蜡析出的影响

The Effects of Pour Point Depressants (PPD) on Wax Precipitation in Simulation Oil

研究了降凝剂(PPD)对模拟油中蜡析出的影响,用高速离心机对特定温度下析出的蜡进行了分离,得到了加剂前后不同温度下的析蜡量;用气相色谱法测定了降凝剂以及模拟油加剂前后析出的蜡的碳数分布及烷烃含量。试验结果表明,不同温度下的析蜡量均减少,降凝剂浓度为0.2%和0.5%时降低的趋势几乎一致,浓度为1%的降凝剂在相对低温时对蜡的析出有很大的抑制作用;析出的蜡与原蜡在碳数分布上有一定的区别,析出的蜡碳数呈双峰分布;降凝剂对模拟油中小碳数烷烃的析出有抑制作用,而对碳数较大的烷烃的析出有促进作用。

The effects of alkyl-naphthalene which is one of the pour point depressants (PPD) on the amount of wax precipitated from the simulation oil are studied in this work. The amount of wax precipitated at different temperature is measured with a high speed centrifuge which can separate precipitated wax from oil under a specific temperature. Carbon number distributions and composition of simulation oil.PPD and the oil added with PPD are measured with gas chromatography. According to the experiments, the results indicate that the amount of wax precipitated at different temperatures decreases,the tendency of reduction is nearly consistent when the concentration of PPD is 0. 2% and 0. 5%;while with l%,the carbon number distributions of precipitated wax that are different from the primary wax show double apices;PPD restrains the deposition of hydrocarbon of small carbon number in the simulation oil,while promotes the deposition of hydrocarbon of large carbon number.