环己烷原料苯纯度测定方法的研究  

Research on the purity analysis method of cyclohexane raw benzene

作　　者：叶文 Ye Wen(SINOPEC-SK(Wuhan)Petrochemical Company Limited,Wuhan 430000,China)

机构地区：[1]中韩(武汉)石油化工有限公司,湖北武汉430000

出　　处：《炼油与化工》2025年第1期45-48,共4页Refining And Chemical Industry

摘　　要：测定环己烷原料苯纯度的方法,旧标准采用ASTM D4492和QSHPRD399,标准更新后采用ASTM D7504。苯是致癌物,内标法操作步骤多,操作人员暴露风险大,且称量样品和加内标物增加了成本,整个分析时间较长。新标准中校正因子归一化法能够解决内标法的不足,提高了分析效率。文中对2种方法分析的不确定度进行了研究,对其产生的误差进行了探讨。归一化法没有明显不确定来源,而内标法测烃杂的不确定度有±0.000 2%,主要来自重复实验的A类不确定度,直接影响了苯纯度的计算,而B类不确定度影响很小。The previous method for the purity analysis of cyclohexane raw benzene is ASTM D4492 and QSHPRD399 in the old standard,and ASTM D7504 is updated standard.Benzene is a carcinogen,and the internal standard method involves multiple steps,which increases the risk of exposure for operators.In addition,weighing samples and adding internal standards increase laboratory costs,and the entire analysis time is relatively long.The apply of calibration factor normalization method in the new standard can effectively solve the problem of the internal standard method and improve analysis efficiency.This article also study the uncertainty of two analysis methods and explore the errors they generated.The normalization method has no obvious source of uncertainty,while the internal standard method has an uncertainty of±0.0002%for measuring hydrocarbon impurities,mainly due to the A-class uncertainty from repeated experiments,which directly affects the calculation of benzene purity,while the B-class uncertainty has little impact.

关 键 词：内标法 归一化法 纯度 不确定度 

分 类 号：TQ317.2[化学工程—高聚物工业]