一种基于水活性的油中微量水分测量方法

Trace moisture measurement in oil base on water activity

工业生产中使用的矿物质油的品质和性能与油中的微量水分含量密切相关。过量的水汽污染会导致油品降解、加剧设备的腐蚀和磨损。因此水分是工业油品常规检测项目之一,无论是使用前还是使用过程中,对油品中水分含量进行精确在线监测都显得尤为重要。根据相平衡热力学的有关原理,类比食品中水活性的定义,推导出了油中水活性的定义,建立了水活性和相对湿度之间的联系,将水活性的测量转换为相对湿度的测量。并引用饱和裕度的概念说明了用水活性表征微水含量的科学性和合理性。提出一种基于水活性的油中微量水分的测量方法。测量结果表明该测量方法具有较好的测量精度,能有效地描述油中微量水分的变化情况。

The quality and performance of mineral oil used in the industrial production is closely related to oil trace moisture content.Excess moisture contamination would lead to Oil degradation and aggravating the corrosion and wear of the equipment.So moisture content is one of the routine testing of industrial oil.Accurate on-line monitoring of moisture content in oil is particularly important whether before using or in using.Analog the definition of water activity in food,This paper deduced the definition of water activity in oil according to related principles of equilibrium thermodynamics.This paper established a link between water activity and relative humidity and convert the measurement of water activity to the relative humidity measurement.This paper expounded the science and rationality of using water activity to describe the moisture content in oil by quoting the concept of saturation margin.And proposed a trace moisture measurement in oil base on water activity.The result shows that this measurement method has good has good precision and can describe the changes of moisture content in oil effectively.