利用聚α-烯烃(PAO)对苯乙烯-马来酸酐共聚物(SMA)进行接枝改性得到改性产物(SMAP)。考察了SMA与PAO质量比、反应温度和反应时间对接枝率的影响,利用傅里叶红外光谱、核磁共振氢谱对产物的结构进行表征;并将SMAP作为脱蜡助滤剂应用在某厂轻脱馏分油的脱蜡脱油工艺中。结果表明,当SMA与PAO质量比为2.5:1.0、反应温度为120℃、反应时间为5 h时,所得改性产物的接枝率最高为9.7%。在一段脱蜡两段脱油工艺条件下,当SMAP的加入质量分数为0.5%时,所得脱油蜡熔点由63.9℃提高至74.9℃,含油质量分数由17.3%降低为1.8%。通过偏光显微镜对脱油蜡进行分析发现,助滤剂的加入使石蜡晶体的尺寸增大并改善了其结晶形态。

Poly-α-olefin (PAO) is used to graft styrene maleic anhydride copolymer (SMA) to obtain SMAP,the modified product.The effects of the mass ratio of SMA to PAO,reaction temperature and reaction time on the grafting ratio are investigated.The structures of SMAP are characterized by means of Fourier infrared spectroscopy and hydrogen magnetic resonance spectroscopy.SMAP is applied as dewaxing filter aid in the dewaxing and de-oiling process for light distillate oil in a plant.The results show that the grafting yield of SMAP reaches 9.7%,the highest when the mass ratio of SMA to PAO is 2.5:1.0,the reaction temperature is at 120℃,and the reaction time is 5 h.Under the condition of one-stage dewaxing and two-stage dewaxing when the adding amount of SMAP is 0.5%,the melting point of dewaxing wax obtained increases from 63.9℃ to 74.9℃ and the oil content decreases from 17.3% to 1.8%.It is found through polarizing microscope analysis on de-oiled wax that the addition of filter aid increases the size of paraffin crystals and improves their crystal morphology.

孙蕊(1998-),女,硕士研究生,主要从事润滑油的生产工作,1716850242@qq.com