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.
作者
王家兴
张雁玲
WANG Jia-xing;ZHANG Yan-ling(Dalian Research Institute of Petroleum and Petrochemical of Sinopec,Dalian 116045,China)
出处
《化学试剂》
CAS
北大核心
2020年第7期828-831,共4页
Chemical Reagents
关键词
原油
酸值
电位滴定法
不确定度
评定
crude oil
acid number
potentiometric titration
uncertainty
evaluate
