润滑油馏分酸值测定标准改进性研究  

Study on the improvement of acid number determination standard for lubricating oil fraction

作　　者：黎小辉 嵇兆辉 朱伟 叶士信 吴爱军 石小军 LI Xiaohui;JI Zhaohui;ZHU Wei;YE Shixin;WU Aijun;SHI Xiaojun(School of Chemistry and Chemical Engineering,Xi'an Shiyou University,Xi'anShaanxi 710065,China;Zhejiang Zhejiang Petroleum Comprehensive Energy SalesCo.,Ltd.,Hangzhou Branch,Hangzhou Zhejiang 310012,China;Shaanxi Red OctoberDevelopment Co.,Ltd.,Xianyang Shaanxi 713199,China;Xi'an PetroleumDajiarun Industry(Group)Co.,Ltd.,Xi'an Shaanxi 710003,China)

机构地区：[1]西安石油大学化学化工学院,陕西西安710065 [2]浙江浙石油综合能源销售有限公司杭州分公司,浙江杭州310012 [3]陕西红十月发展有限公司,陕西咸阳713199 [4]西安石油大佳润实业(集团)有限公司,陕西西安710003

出　　处：《石油化工应用》2024年第10期89-95,共7页Petrochemical Industry Application

基　　金：陕西省自然科学基础研究计划(2024JC-YBMS-100)。

摘　　要：本文基于润滑油基础油酸值测定过程中出现的问题,对GB/T 7304—2014标准提出改进性做法,并通过大量酸值测定实验验证改进措施的有效性。研究结果表明,对于酸值较低的油品,为提高酸值测量精度并使滴定过程中电位突跃更易显现,可适当增加油样质量,采用较小浓度的氢氧化钾-乙醇滴定溶液替代标准中规定的0.10 mol/L的氢氧化钾-异丙醇标准溶液。此时,当酸值测定过程若仍存在无电位突跃的现象时,宜将pH为12.00处视为滴定终点。本文研究结果以期为该标准未来的修订与进一步完善、发展提供参考作用。This work proposes an improved approach to the GB/T 7304—2014 standard for total acid number determination of lubricating base oils to solve the problems encountered during the determination process.The effectiveness of the improved measures has been verified through a large number of acid value determination experiments.The results indicate that for oil products with low acid concentration,in order to improve the accuracy of acid value measurement and make potential jumps more likely to occur during titration,the quality of the oil sample can be appropriately increased by using a lower concentration of potassium hydroxide ethanol titration solution instead of the 0.10 mol/L potassium hydroxide isopropanol standard solution specified in the standard.At this point,when there is no potential jump in the acid value determination process,pH=12.00 can be considered as the titration endpoint.The research results are expected to serve as a reference for the future revision,further improvement,and development of this standard.

关 键 词：润滑油 酸值 测定标准 电位滴定法 改进 

分 类 号：TE624.5[石油与天然气工程—油气加工工程]