Water Content in Petroleum Products

Description

A traditional method for the quantitative determination of the volume fraction of water in petroleum products by distillation to control the quality of fuels and fuel oils.

The presence of water in fuel or fuel oil is not just a standard violation, but a direct threat of engine shutdown, the formation of ice plugs in winter, and the development of rapid microbiological contamination (bacteria) in fuel tanks. The classic distillation method, professionally performed by RENA laboratory specialists, allows for the accurate determination of free and emulsified water in dark and light petroleum products. This analysis is a basic and mandatory requirement for the incoming quality control of energy resources before discharging them into storage facilities. Technically, the test (Dean-Stark method) consists of the physical separation of liquids by their boiling points. A sample of the petroleum product is mixed with a volatile, water-insoluble solvent (e.g., xylene) and heated to boiling in a glass flask. The solvent vapors, along with the water vapor, rise, condense in the condenser, and enter a special graduated receiver (Dean-Stark trap). Since water has a higher density than the solvent, it settles at the bottom of the receiver, forming a clear meniscus, while the excess solvent overflows back into the flask. After the complete removal of water from the sample, the operator reads the volume of water in the receiver and calculates its volume fraction in the original product.