Entrained water in liquid hydrocarbons and chemicals can be a problem. This is particularly true for fuels that contain high concentrations of surfactants which are readily present in hydrocarbons and chemicals (see below). Surfactants make water removal difficult for conventional liquid/liquid coalescers and other water separation equipment because they lower the interfacial tension between the water and the continuous phase fluid.
The same problem can occur when attempting to separate oil from water. The presence of surfactants also leads to disarming of the oil coalescer. Pall’s AquaSep coalescer will efficiently separate water from a hydrocarbon stream without disarming.
Common Sources of Surfactants in Hydrocarbon and Chemical Processes
- Sulfur compounds
- Organic acids
- Well treating chemicals
- Anti-static chemicals
- Corrosion inhibitors
- Chemical additives
The Pall AquaSep coalescer is a multiple stage system. It first removes particulate matter, then coalesces and separates the dispersed phase liquid from the continuous phase liquid.
For removal of water from hydrocarbons, an AquaSep coalescer will remove entrained water to a level of below 15 ppmv over a wide range of conditions:
- Inlet water concentration as high as 3% water by volume (i.e., 30,000 ppmv.)
- Interfacial tension as low as 3.0 dyne/cm.
For removal of oil from water, an AquaSep Plus coalescer will remove free oil from water over a wide range of conditions in the horizontal configuration.
Products in this datasheet may be covered by one or more patents, including EP 930,926; US 5,443,724; US 6,332,987.