共聚物OMA降凝剂的合成及对非洲原油降凝评价  

Synthesis of Copolymer OMA as Pour Point Depressant for an African Crude Oil

作　　者：张金俊[1] 姚成[1] 宋娜[1] 王兰芳[1] 周健[2] 关建宁[1] 

机构地区：[1]南京工业大学理学院,江苏南京210009 [2]中国石化北京石油化工科学研究院,北京100083

出　　处：《油田化学》2009年第2期199-203,共5页Oilfield Chemistry

基　　金：南京工业大学博士创新基金"原油降凝剂的合成及其应用"(项目编号BSCX200813)

摘　　要：在甲苯溶液中合成了甲基丙烯酸十八酯-顺丁烯二酸酐-丙烯酰胺三元共聚物OMA,改变合成条件得到了大量OMA样品,考察了这些样品对一种非洲原油的降凝幅度,确定了该降凝剂的使用条件。该非洲原油含蜡18.3%、含胶质14.7%、基本不含沥青质,密度0.8996g/cm3,凝点38.5℃,取自中国黄岛油库。研究结果表明摩尔比3:1:1的3种单体在80℃用1%PBO引发,反应自动加速升温至95℃后降温至80℃反应3小时,得到的共聚物OMA-6-2在加量200μg/g、加剂温度70℃时降黏效果较好,使原油凝点下降9.4℃。用GPC法测定,该OMA样品的重均、数均相对分子质量分别为13600和9200。蜡晶显微照片统计分析表明,加剂原油中蜡晶数由<100增至>1300,反映蜡晶尺寸分布均匀性的蜡晶直径的标准偏差降低67%。Oetadecylmethaerylate/maleic anhydride/acrylamide copolymer was synthesized by solution polymerization in toluene and lots of eopolymer samples were prepared under varying synthetic conditions and investigated for depressing pour point of an African crude oil and establishing the parameters of treating technology. The African crude oil was taken from an crude oil storage park else where in China,contained 18.3% wax, 14. 7% resin,and practically no asphahene and had density of O. 8996 g/era3 and pour point of 38.5℃. A most suitable copolymer,notated as OMA-6-2 ,was prepared by eopolymerization of the above mentioned three monomers in molar ratio 3： 1：1 ,which was initiated by 1.0% PBO at 80℃, self-accelerated with temperature exothermieally rised to 95℃ and conducted at 80℃ in 3 hrs,and had weight and number average molar mass of 13600 and 9200,respectively,as obtained by a GPC technique. With OMA-6-2 introduced at dosage 200/xg/g at temperature 70℃ ,the pour point of the crude oil was depressed by 9.4℃. The statistical data analysis of micrograms showed that the number of wax erystallites increased from 〈 100 to 〉 1300 and the standard deviation of wax erystallite diameter, expressing the uniformity of erystallite size distribution,decreased by 67% in the crude oil treated by OMA-6-2 in comparison with that in the original crude oil.

关 键 词：甲基丙烯酸十八酯/顺丁烯二酸酐/丙烯酰胺共聚物 降凝剂 合成 结构参数 非洲原油 含蜡原油 降凝效果 降凝机理 

分 类 号：TE869[石油与天然气工程—油气储运工程] TE832.332