电位滴定法测定原油酸值的不确定度评定  

Evaluate the Uncertainty of the Acid Number of Crude Oil by the Potentiometric Titration Test Method

作　　者：王家兴[1] 张雁玲 WANG Jia-xing;ZHANG Yan-ling(Dalian Research Institute of Petroleum and Petrochemical of Sinopec,Dalian 116045,China)

机构地区：[1]中国石化大连石油化工研究院,辽宁大连116045

出　　处：《化学试剂》2020年第7期828-831,共4页Chemical Reagents

摘　　要：利用电位滴定法对原油中的酸值进行测定,对酸值试验结果进行了不确定度评定,建立酸值不确定度评定的计算模型,分析和计算了试验过程中影响酸值测量结果的不确定度分量,进而给出原油酸值的不确定度,原油酸值的测定结果为0.63 mg/g,其扩展不确定度为0.01 mg/g(置信因子k=2),原油酸值重复性试验是影响该方法不确定度的主要因素,重视原油试样及氢氧化钾异丙醇的滴定过程对不确定度产生的影响,原油酸值测定中,应重点从这两个方面加以改进,提高酸值测量结果的准确性。The acid number of crude oil is determined by potentiometric titration method.The uncertainty of the acid number are evaluated.The calculation model of the acid number uncertainty is established.The uncertainty components affecting the acid number measurement results during the test are analyzed and calculated.The uncertainty of the acid number of crude oil is further given.The determination result of the acid number of crude oil is 0.63 mg/g,and its expanded uncertainty is 0.01 mg/g(confidence factor k=2).The repeatability test of crude oil acid number is the main factor affecting the uncertainty of the method.Attention should be paid to the influence of the titration process of crude oil sample and potassium hydroxide isopropyl alcohol on the uncertainty.In the determination of crude oil acid number,improvement should be focused on these two aspects to improve the accuracy of the acid number measurement results.

关 键 词：原油 酸值 电位滴定法 不确定度 评定 

分 类 号：TB99[一般工业技术—计量学]