Product Description

Membrane Method Desalination ED*8

Desalination Evaporator Antiscalant

Maximizes thermal efficiency of MED systems

Provides excellent CACO3 inhibition

Reduces or eliminates acid cleaning

Description and Use

ED*8 is a blend of deposit control agents designed for use in desalination evaporators. Low doses of this product are effective in preventing in-organic scales that reduce thermal efficiency and require periodic shutdowns for acid cleaning.ED*8 functions as a crystal inhibitor which effectively increases the solubility of dissolved salts. Any crystals that form are modified and dispersed so that adherent scales cannot form on heat transfer surfaces in the evaporator.

Typical Applications

ED*8 was specifically developed for Multiple Effect Distillation (MED) plants. Experience has shown that CaCO3 is the primary component of scale in these evaporator systems. WhileED*8 is effective in dispersing a variety of scale-forming compounds, it was formulated primarily to inhibit CaCO3 formation.ED*8 has been shown to be far more effective in controlling CaCO3 than traditional antiscalants, including those based on polymaleic acid polymers and copolymers.ED*8 is stable in chlorinated systems.

Treatment and Feeding Requirements

Proper dosage levels forED*8 depend on many factors, such as feedwater TDS, pH, calcium levels, and other conditions specific to individual applications. For most MED/MSF systems the dos-age is in the range of 3 to 6 mg/L. In MED systems,ED*8 should be fed to the feedwater line, downstream of the condenser outlet. In MSF systems,ED*8 should be fed to the feedwater line, upstream of the heat recovery section. Continuous feed is recommended for optimum performance. Consult representative for your specific system.

General Properties

Appearance ................…….........…...…. yellow liquid

Density at *1°C..................................... 1.*6

Flash Point (closed cup) .................... >**0°C

Freeze Point ............................................. *7°C

pH ..........................................................…… > *2.0

Solubility .................................……………... **0% in water

Viscosity at *1°C ................................... 8 cps

Compatibility

From the standpoint of product feeding and storage equipment,ED*8 is compatible with most materials of contruction. Acceptable materials include low carbon steel, aluminum, stainless steels, PVC, polyethylene, polypropylene, viton, teflon, neoprene, tygon, and natural rubber. (Viton is a registered trademark of DuPont Dow Elastomers. Teflon is a registered trademark of DuPont.)

Safety Precautions

A Material Safety Data Sheet containing detailed information about this product is available on request.