摘要
以甲苯为溶剂,采用溶液聚合法合成了丙烯酸十八酯/醋酸乙烯酯共聚物POA-VA,用差示扫描量热法测定了POA-VA的结晶开始温度、结晶高峰温度及结晶潜热。上述结晶参数值受合成时聚合溶液中单体质量分数（20%-50%）的影响较小,不受聚合温度（60-90℃）的影响,随OA、VA摩尔比的增大（1∶1-10∶1）和聚合时间的延长（1-8 h）而增大。用单体摩尔比不同的POA-VA以200 mg/L的剂量处理不同产地的含蜡原油时,凝点33℃的大庆原油降凝幅度仅为1-3℃,最大降幅出现在单体摩尔比为2∶1时;凝点17℃的长庆原油降凝幅度为3-14℃,随单体摩尔比增大而增大;凝点25℃的胜利原油降凝幅度为4-10℃,最大降幅出现在单体摩尔比为8∶1时。从降凝剂分子的极性、相对分子质量、原油组成等讨论了POA-VA的降凝效果。
The copolymerization of octadecyl acrylate and vinyl acetate in toluene solution to give copolymer POA-VA was studied and the onset and peak points and the latent heat of crystalization of POA-VA were determined by DSC method.These DSC crystalization characteristics were slightly influenced by monomers mass fraction in polymerizing mixture（20—50%）,not influenced by polymerization temperature（60—90℃） and increased with increasing OA to VA molar ratio（MMR） from 1∶1 to 10∶1 and polymerization time from 1 to 8 hrs.Waxy crude oils（WCOs） of different occurance were treated by copolymer POA-VA of various MMR at dosage 200 mg/L and following results were obtained：for Daqing WCO of pour point（PP）=33℃ the PP depression was in range 1—3℃ with the largest value at MMR=2∶1;the PP depression of changqing WCO of PP=17℃ was in range 3—14℃ and increased with increasing MMR;the PP depression of Shengli WCO of PP=25℃ was in range 4—10℃ and went through a maxim at MMR =8∶1.The PP depression functions of copolymer POA-VA were discussed in terms of polarity and molar mass of PP depressants and composition of WCOs.
出处
《油田化学》
CAS
CSCD
北大核心
2009年第1期102-105,97,共5页
Oilfield Chemistry
基金
国家高技术研究发展863计划资助项目“深海立管中严重段塞流消除方法及配套分离系统研究”(项目编号2006AA09Z302)
关键词
丙烯酸十八酯/醋酸乙烯酯共聚物
降凝剂
合成反应条件
结晶温度
结晶热
降凝效果
含蜡原油
octadecy acrylate/vinyl acetate copolymer
pour point depressant
copolymerization parameters
crystalization temperatures
crystalization heat
pour point depression efficiency
waxy crude oils
