不同极性沥青质对含蜡油胶凝特性的影响
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- 英文论文题名：Effect of Asphaltenes of Different Polarity on Gelation Property of Waxy Oil
- 论文作者：李宇卓 ; 韩善鹏 ; 张劲军
- 英文论文作者：Yuzhuo Li ; Shanpeng Han ; Jinjun Zhang ; National Engineering Laboratory for Pipeline Safety/Beijing Key Laboratory of Urban Oil and Gas Distribution Technology ; China University of Petroleum
- 年：2016
- 作者机构：中国石油大学(北京)油气管道输送安全国家工程实验室/城市油气输配技术北京市重点实验室;
- 论文关键词：沥青质 ; 极性 ; 分散程度 ; 胶凝特性
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第十七分会：流变学
- 语种：中文
- 分类号：TE621
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第十七分会 ; 流变学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：237k
- 原文格式：D
- 会议级别：全国
摘要
由于沥青质在原油中特殊的溶解-聚集特性,即使其含量较低,仍然是影响含蜡原油流变特性的重要因素~([1-2])。沥青质常被笼统地归类为可溶于苯而不溶于正庚烷的一类物质,这掩盖了沥青质中各组成之间差异。针对委内瑞拉减压渣油沥青质,本文采用4种不同比例的溶剂(二氯甲烷:正戊烷),分离得到极性依次降低的4种沥青质(F_(33/67)、F_(25/75)、F_(20/80)、F_(10/90))。分别配制了含蜡量10wt%、沥青质含量0.2wt%的模拟油,通过分析不同极性沥青质在模拟油中分散程度的差异,描述了其对含蜡油胶凝温度(G'=G"时对应的温度)的影响。研究表明,沥青质的存在,导致含蜡油胶凝温度降低,且沥青质极性越弱,降幅越大(图1)。沥青质的极性降低,其在模拟油中分散程度增大(图2),小颗粒沥青质对模拟油胶凝产生更强的抑制作用~([1])。
Aspnaltene is an important component influencing the rheological properties or waxy crude oil.Generally,the asphaltenes were defined as a solution class that precipitate in heptanes but dissolves in toluene.The changes in polarity for the various components of asphaltene were not highlight in this definition.In this study,four kinds of asphaltenes of gradually decreasing polarity(F_(33/67)>F_(25/75)>F_(20/80)>F_(10/90)) were separated from Venezuelan vacuum residue asphaltene using the solvent made of dichlorome thane and n-pentane at four different volume ratios.The model oils with 10wt%paraffin and 0.2wt%asphaltenes of different polarity were prepared for gelation measurements.The results indicated that the addition of asphaltenes can depress the gelation temperature(T_(gel)) of model oil.From particle size distribution,the asphaltenes with lower polarity was better dispersed in model oil,resulting in more effective gelation temperature decreasing.
Aspnaltene is an important component influencing the rheological properties or waxy crude oil.Generally,the asphaltenes were defined as a solution class that precipitate in heptanes but dissolves in toluene.The changes in polarity for the various components of asphaltene were not highlight in this definition.In this study,four kinds of asphaltenes of gradually decreasing polarity(F_(33/67)>F_(25/75)>F_(20/80)>F_(10/90)) were separated from Venezuelan vacuum residue asphaltene using the solvent made of dichlorome thane and n-pentane at four different volume ratios.The model oils with 10wt%paraffin and 0.2wt%asphaltenes of different polarity were prepared for gelation measurements.The results indicated that the addition of asphaltenes can depress the gelation temperature(T_(gel)) of model oil.From particle size distribution,the asphaltenes with lower polarity was better dispersed in model oil,resulting in more effective gelation temperature decreasing.
引文
[1]Lei,Y.;Han,S.;Zhang,J.Energy&Fuels.2014,28(4):1065.
[2]Alcazar-Vara L.A.;Garcia-Martinez J.A.;Buenrostro-Gonzalez E.Fuel.2012,93(1):200.
[2]Alcazar-Vara L.A.;Garcia-Martinez J.A.;Buenrostro-Gonzalez E.Fuel.2012,93(1):200.