Cost-effective recovery of fresh water from seawater is critical to a wide range of industries such as the power, chemical, marine, oil and gas industries. During the distillation process, the formation of scale on heat transfer surfaces can significantly reduce heat transfer efficiency and increase operation and maintenance costs. Scale formation depends on temperature, concentration and pH, but generally takes the form of:
- Calcium carbonate,
- Magnesium hydroxide, and,
- Calcium sulphate.
Conventional scale inhibition methods, such as the use of sulphuric acid and polyphosphates, have given rise to a new generation of antiscalants based on polycarboxylic acids.
RXSOL Altreat 400 scale inhibitor is a polycarboxylic acid that controls inorganic scale formation. Small amounts of this copolymer, based on maleic acid, effectively handles large quantities of dissolved salts, thus preventing precipitation,settling and baking onto heat transfer surfaces. RXSOL Altreat 400 also impairs crystal growth, modifying the crystal structure to create a soft sludge byproduct that does not adhere to heat transfer surfaces.RXSOL Altreat 400 readily dissolves in any type of water. The typical dosage to feedwater ranges from a minimum of two parts per million (ppm) to a maximum of 10 ppm, depending on the quality of the seawater. This versatile antiscalant effectively performs at the range of temperatures encountered during mechanical vapour compression and during single and multi-effect distillation processes.Test results demonstrate that RXSOL Altreat 400 is more effective than other scale inhibitors under variable conditions,including water type, temperature and run time.
Note: This article uses material from the http://rxmarine.com/