薄膜过滤法测定润滑油中的不溶物  

Determination of Insolubles in Lubricating Oils by Membrane Filtration

作　　者：韩熹微 杨孟智 史军歌 Han Xiwei;Yang Mengzhi;Shi Junge(Sinopec Research Institute of Petroleum Processing,Co.,Ltd.,Beijing 100083,China)

机构地区：[1]中石化石油化工科学研究院有限公司,北京100083

出　　处：《合成润滑材料》2024年第1期5-8,共4页Synthetic Lubricants

摘　　要：为了解决现行润滑油不溶物测定方法(GB/T8926—2012方法)中样品和溶剂用量大,分析时间久及检测下限高等问题,对薄膜过滤法测定润滑油不溶物(正戊烷不溶物和二甲苯不溶物)的可行性进行了探究。通过对滤膜,溶剂及样品量的选择,确定了滤膜孔径为0.8μm,溶剂为甲苯-乙醇,样品量分别为1.0 g(正戊烷不溶物)及0.2 g~1.0 g(二甲苯不溶物)。薄膜过滤法重复性较好,相对标准偏差(RSD)小于7.0%,检测下限为0.04%。与现行GB/T8926—2012方法相比,薄膜过滤法具有称样量少,溶剂消耗量低,分析时间短及检测下限低的优点,满足当今绿色快速分析的要求。In order to solve the problems of large sample and solvent consumption,long analysis time and high detection limit in the current method(GB/T8926—2012 method)for the determination of insolubles in lubricating oils,the feasibility of membrane filtration method for the determination of insolubles in lubricating oils(n-pentane-insoluble and xylene-insoluble)was investigated.Based on the selection of filter membrane,solvent and sample volume,the pore size of the filter membrane was 0.8μm,the solvent was toluene-ethanol,and the sample volumes were 1.0 g(n-pentane-insoluble)and 0.2 g~1.0 g(xylene-insoluble)respectively.The membrane filtration method has a good reproducibility with the relative standard deviation(RSD)less than 7.0%and the low detection limit was 0.04%.Compared with the GB/T8926—2012 method,the membrane filtration method has the advantages of less sample and solvent consumption,shorter analysis time and lower detection limit,which meets the requirements of today’s green rapid analysis.

关 键 词：正戊烷不溶物 二甲苯不溶物 绿色分析 

分 类 号：TE626.3[石油与天然气工程—油气加工工程]